Milwaukee/Sullivan, WI
Weather Forecast Office
Overview
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A very busy six day period occurred to start the month of August across much of Wisconsin. Multiple days of strong to severe storms resulted in hail, damaging winds that knocked down trees and powerlines, as well as a few tornadoes. The biggest severe weather day and most widespread damage occurred on August 10th, 2021. Near record instability present across southern Wisconsin resulted in a line of thunderstorms that moved from west to east and produced persistent wind gusts of 40 to 60 mph for upwards of 20 minutes. A stronger core of winds was noted from east of Janesville to southern Waukesha, to New Berlin, and then into West Allis. In particular a gust of 77 mph was recorded in Eagle in Waukesha County. Hundreds of thousands of customers across southern Wisconsin were without power and it took multiple days to restore power to all of the impacted customers. We-Energies stated this was likely the largest outage in the companies history and the largest restoration effort they have ever embarked on.
In addition to the strong to severe storms this stretch of active weather brought some much needed rainfall to ease the ongoing drought conditions. Much of southern Wisconsin entering the month of August was between 9 to 10 inches below normal for rainfall for the year. While some locations were able to receive upwards of 8 to 9 inches of rainfall this was not widespread. On average much of Wisconsin received between 2 to 3 inches of rainfall. While that did help portions of southern Wisconsin along the Wisconsin and Illinois border remain in severe drought. |
 Insert Picture of Thunderstorm Shelf Cloud or Tornado from this week. |
Overview
Storms started by early afternoon across southeastern Wisconsin from Madison northeast into Sheboygan. Strong wind gusts of 63 mph were reported in Sheboygan with some tree damage. Storms continued to slowly move south to southeast with very few additional reports of damage. It wasn't until later into the evening did additional hail and damaging wind reports occur. A few spotters reported some brief funnel clouds west of Whitewater in Rock County but no damage or tornadoes were reported from these reports. Main thing that came with this round of storms was some beneficial rainfall.
Radar:
Storms developed across central Wisconsin and eventually morphed into a line that dropped south into Illinois. Persistent easterly winds helped to keep some storms going across far southern Wisconsin through the late evening hours.
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| Radar loop with warnings issued by NWS Offices for Friday August 6th. |
Photos:
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| One Inch Hail in Lake Mills | Hail in Columbus | Quarter size hail Cambridge | Quarter size hail in Columbus |
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| Quarter size hail Colubmus | Quarter size hail Colubmus | Near golf ball size hail Johnson Creek | Quarter size hail in Hartford |
Storm Reports
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| SPC Storm Reports for Aug. 6th 2021 | Link to Map of storm reports |
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 550 PM CDT SUN AUG 15 2021 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0428 PM TSTM WND GST 3 NNW SHEBOYGAN FALLS 43.77N 87.85W 08/06/2021 M63 MPH SHEBOYGAN WI ASOS MEASURED AT THE ASOS AT SHEBOYGAN COUNTY MEMORIAL AIRPORT. 0428 PM TSTM WND GST 3 SSW HOWARDS GROVE 43.78N 87.85W 08/06/2021 M63 MPH SHEBOYGAN WI ASOS ASOS STATION KSBM SHEBOYGAN-AIRPORT. 0445 PM TSTM WND DMG 2 WNW PLYMOUTH 43.76N 88.01W 08/06/2021 SHEBOYGAN WI BROADCAST MEDIA RELAYED REPORT OF TREE DAMAGE IN PLYMOUTH. TIME ESTIMATED. 0458 PM TSTM WND DMG 2 N KOHLER 43.76N 87.78W 08/06/2021 SHEBOYGAN WI PUBLIC 3 INCH TREE LIMBS REPORTED BROKEN. RECEIVED VIA MPING. 0615 PM HAIL LAKE MILLS 43.08N 88.91W 08/06/2021 E1.50 INCH JEFFERSON WI PUBLIC 1-1.5 INCH HAIL. REPORTED VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR. 0632 PM HAIL 1 ESE JOHNSON CREEK 43.08N 88.75W 08/06/2021 E1.50 INCH JEFFERSON WI PUBLIC 1 TO 1.5 HAIL. PICTURE VIA SOCIAL MEDIA. 0704 PM HEAVY RAIN 1 SW MEQUON 43.22N 88.00W 08/06/2021 M1.20 INCH OZAUKEE WI PUBLIC 0741 PM NON-TSTM WND GST 2 W NORTH BAY 42.77N 87.82W 08/06/2021 M49 MPH RACINE WI ASOS ASOS STATION KRAC RACINE-BATTEN AIRPORT. 0808 PM HAIL 5 W WHITEWATER 42.83N 88.84W 08/06/2021 E1.00 INCH ROCK WI PUBLIC REPORT JUST OUTSIDE OF WHITEWATER ALONG COUNTY ROAD N OF QUARTER SIZE HAIL. 0828 PM FUNNEL CLOUD 5 W WHITEWATER 42.83N 88.84W 08/06/2021 ROCK WI TRAINED SPOTTER SPOTTER REPORTS FUNNEL CLOUD EXTENDING ABOUT HALF WAY DOWN. 0830 PM TSTM WND DMG 2 WSW KENOSHA 42.57N 87.85W 08/06/2021 KENOSHA WI BROADCAST MEDIA TREE DOWN ON A HOUSE RELAYED FROM BROADCAST MEDIA. TIME ESTIMATED. 0842 PM HEAVY RAIN 1 NW WAUKESHA 43.03N 88.25W 08/06/2021 M2.38 INCH WAUKESHA WI PUBLIC 0955 PM TSTM WND DMG 2 NE FITCHBURG 43.01N 89.40W 08/06/2021 DANE WI BROADCAST MEDIA CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 NE FITCHBURG.... SEVERAL LARGE TREE LIMBS REPORTED DOWN. TIME ESTIMATED FROM RADAR. 1000 PM TSTM WND DMG 1 NNE FITCHBURG 43.00N 89.41W 08/06/2021 DANE WI BROADCAST MEDIA MEDIUM TREE BRANCHES DOWN IN FITCHBURG. TIME ESTIMATED. 0700 AM HEAVY RAIN 1 W OCONOMOWOC 43.11N 88.52W 08/07/2021 M2.26 INCH WAUKESHA WI COCORAHS 0700 AM HEAVY RAIN 1 ENE GREENDALE 42.94N 87.98W 08/07/2021 E2.03 INCH MILWAUKEE WI COCORAHS 0700 AM HEAVY RAIN 1 NNW BELGIUM 43.51N 87.86W 08/07/2021 M2.03 INCH OZAUKEE WI CO-OP OBSERVER 0700 AM HEAVY RAIN 1 SE OCONOMOWOC 43.10N 88.49W 08/07/2021 M2.42 INCH WAUKESHA WI CO-OP OBSERVER RETIRED NWS EMPLOYEE. 0700 AM HEAVY RAIN 4 E BEAVER DAM 43.46N 88.76W 08/07/2021 M2.27 INCH DODGE WI COCORAHS 0700 AM HEAVY RAIN 4 NE VERONA 43.02N 89.48W 08/07/2021 M2.07 INCH DANE WI COCORAHS 0700 AM HEAVY RAIN 4 NE OREGON 42.97N 89.34W 08/07/2021 M2.10 INCH DANE WI PUBLIC 0700 AM HEAVY RAIN 3 N KEKOSKEE 43.57N 88.57W 08/07/2021 M2.11 INCH DODGE WI COCORAHS && $$
Environment:
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| SPC Day 1 Outlook 13 UTC | SPC Day 1 Outlook 20 UTC | DVN Sounding Friday Evening | GRB Sounding Friday Evening |
Messaging:
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| NWS Milwaukee discussing the busy days ahead with multiple chances for severe weather through the weekend. |
Overview
Multiple rounds of thunderstorms were observed on Saturday August 7th. The morning round was a decaying Mesoscale-Convective-System (MCS) that had developed over Minnesota earlier and was moving southeast into southern Wisconsin. A few stronger wind gust were observed with these storms. Then a warm front lifted north across southern Wisconsin into central Wisconsin. With much of the area now solidly in the warm sector additional storms began to develop over western and southwestern Wisconsin Saturday afternoon. A few supercells developed to the west and ended up producing an EF-1 tornado in Iowa County. The storms eventually morphed into a complex of storms that continued east and a few additional reports of damage were observed. By the overnight period storms began to back build along the Lake Michigan shoreline and heavy rainfall and minor to moderate flooding was observed in Milwaukee, Washington, and Ozaukee counties.
Tornado:
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Tornado - Highland
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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Radar:
A few supercell thunderstorms developed over western Wisconsin and move east into southern Wisconsin. These eventually morphed into more of a thunderstorm complex as they entered southern Wisconsin. One tornado was observed with these storms along with other wind damage and flooding along the Lake Michigan shoreline.
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| Radar loop with warnings issued by NWS Offices for Saturday August 7th. |
Photos:
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| Highland Tornado photo from Julia Kachinske | Tree damage in Watertown from @ckaniewki on Twitter | Tree damage in Dodgeville from Matthew Nevers | Shelf Cloud captured by Charlie Boudo |
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| Inflow into storm near Brighton | Shelf Cloud captured by Kory Hartman near Baraboo | Shelf Cloud captured by Charlie Boudo near Summit | Shelf Cloud captured by Charlie Boudo |
Storm Reports
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| SPC Storm Reports for Aug. 7th 2021 | Link to Map of storm reports |
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 710 PM CDT SUN AUG 15 2021 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 1230 PM TSTM WND DMG 1 W WATERTOWN 43.19N 88.74W 08/07/2021 JEFFERSON WI NWS EMPLOYEE LARGE TREES DOWN ALONG WEST ST. ALONG WITH PEA SIZE HAIL. 1230 PM TSTM WND GST 1 W WATERTOWN 43.19N 88.74W 08/07/2021 E60 MPH JEFFERSON WI NWS EMPLOYEE 1235 PM TSTM WND GST 1 S WATERTOWN 43.17N 88.72W 08/07/2021 M60 MPH JEFFERSON WI AWOS MEASURED AT WATERTOWN AIRPORT. 1235 PM TSTM WND DMG 1 S WATERTOWN 43.17N 88.72W 08/07/2021 JEFFERSON WI PUBLIC TREE DOWN ALONG BOOMER ST. 0509 PM TORNADO 2 NNW HIGHLAND 43.08N 90.40W 08/07/2021 IOWA WI NWS STORM SURVEY NWS DAMAGE SURVEY IN NW IOWA COUNTY FOUND LOW END EF-1 TORNADO DAMAGE. MAIN STRUCTURAL DAMAGE TO TWO BARNS ON A PROPERTY NORTH OF HIGHLAND ON CAMP RD. OTHERWISE, MAINLY SPORADIC TREE DAMAGE EAST OF THERE. 0509 PM HAIL 3 NNW HIGHLAND 43.08N 90.39W 08/07/2021 M2.50 INCH IOWA WI PUBLIC MULTIPLE REPORTS OF TENNIS BALL SIZED HAIL FROM FARMERS IN NW IOWA COUNTY VIA NWS DAMAGE SURVEY. NO MEASUREMENTS, BUT SAID TWO HAIL STONES WOULD FIT END TO END ON A DOLLAR BILL OR SLIGHTLY LOWER. 0513 PM TSTM WND DMG 3 ENE LAKE WISCONSIN 43.39N 89.52W 08/07/2021 COLUMBIA WI LAW ENFORCEMENT LARGE TREE LIMB DOWN ON POWER LINE OFF OF COUNTY HIGHWAY V. 0515 PM TSTM WND DMG 2 N HIGHLAND 43.08N 90.38W 08/07/2021 IOWA WI LAW ENFORCEMENT COUNTY SHERIFF REPORTS BARN DAMAGE AND TREES TOPPED ALONG CAMP ROAD NORTH OF HIGHLAND. POSSIBLE TORNADO. 0550 PM TSTM WND GST 4 SW KINGSTON 43.66N 89.20W 08/07/2021 E50 MPH GREEN LAKE WI EMERGENCY MNGR CORRECTS PREVIOUS TSTM WND GST REPORT FROM 4 SW KINGSTON. DALTON. 0730 PM TSTM WND DMG 3 NNW FORT ATKINSON 42.97N 88.86W 08/07/2021 JEFFERSON WI PUBLIC TREES AND LIMBS DOWN ALONG KIESLING RD. 0117 AM FLOOD GRAFTON 43.32N 87.95W 08/08/2021 OZAUKEE WI TRAINED SPOTTER REPORT OF ONE FOOT OR MORE OF WATER OVER GREEN BAY RD. JUST SOUTH OF FALLS ROAD IN GRAFTON. 0127 AM FLOOD MEQUON 43.23N 87.98W 08/08/2021 OZAUKEE WI BROADCAST MEDIA STREET FLOODED WITH FLOWING WATER IN THE MEQUON AREA. 0300 AM FLOOD 2 ENE WEST ALLIS 43.02N 88.00W 08/08/2021 MILWAUKEE WI LAW ENFORCEMENT REPORTS OF WATER COMPLETELY COVERING THE ROADS ALONG THE ROOT RIVER PARKWAY NEAR CLEVELAND AND OKLAHOMA, AND AT STATE HWY 100 NEAR LINCOLN AVE IN WEST ALLIS. 0328 AM FLOOD 1 WSW WAUWATOSA 43.06N 88.05W 08/08/2021 MILWAUKEE WI DEPT OF HIGHWAYS WATER OVER THE ROAD ON I-41. 0800 AM HEAVY RAIN 1 W WEST BEND 43.42N 88.21W 08/08/2021 M6.15 INCH WASHINGTON WI COCORAHS 0600 AM HEAVY RAIN 1 SSE JACKSON 43.31N 88.16W 08/08/2021 M4.29 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-28 JACKSON 0.9 SSE. 0600 AM HEAVY RAIN ELM GROVE 43.05N 88.08W 08/08/2021 M3.35 INCH WAUKESHA WI COCORAHS COCORAHS STATION WI-WK-66 ELM GROVE 0.4 NE. 0600 AM HEAVY RAIN 2 W GERMANTOWN 43.24N 88.16W 08/08/2021 M3.48 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-37 HUBERTUS 3.1 E. 0600 AM HEAVY RAIN 3 WSW GLENDALE 43.11N 87.99W 08/08/2021 M4.28 INCH MILWAUKEE WI COCORAHS COCORAHS STATION WI-MW-14 MILWAUKEE 3.6 NNW. 0600 AM HEAVY RAIN 1 NNW SAINT FRANCIS 42.99N 87.88W 08/08/2021 M2.08 INCH MILWAUKEE WI COCORAHS COCORAHS STATION WI-MW-86 ST. FRANCIS 1.2 NNW. 0600 AM HEAVY RAIN 1 S SAUKVILLE 43.37N 87.94W 08/08/2021 M2.77 INCH OZAUKEE WI CO-OP OBSERVER CO-OP OBSERVER STATION SAVW3 SAUKVILLE. 0600 AM HEAVY RAIN 1 WNW SLINGER 43.33N 88.30W 08/08/2021 M3.05 INCH WASHINGTON WI CO-OP OBSERVER CO-OP OBSERVER STATION SLRW3 SLINGER 1 WNW. 0610 AM HEAVY RAIN 2 WSW ALLENTON 43.42N 88.37W 08/08/2021 M4.83 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-33 ALLENTON 1.4 WSW. 0611 AM HEAVY RAIN 1 NNW WEST BEND 43.44N 88.20W 08/08/2021 M4.80 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-23 WEST BEND 1.3 NNW. 0613 AM HEAVY RAIN 1 WSW BUTLER 43.10N 88.09W 08/08/2021 M3.06 INCH WAUKESHA WI COCORAHS COCORAHS STATION WI-WK-93 1 WSW BUTLER. 0630 AM HEAVY RAIN 2 ENE MENOMONEE FALLS 43.15N 88.09W 08/08/2021 M3.12 INCH WAUKESHA WI COCORAHS COCORAHS STATION WI-WK-99 MENOMONEE FALLS 1.7 ENE. 0645 AM HEAVY RAIN JACKSON 43.31N 88.16W 08/08/2021 M3.52 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-2 JACKSON 0.5 SSE. 0654 AM HEAVY RAIN 1 NNE PORT WASHINGTON 43.40N 87.87W 08/08/2021 M2.10 INCH OZAUKEE WI TRAINED SPOTTER 24 HOUR TOTAL. 0700 AM HEAVY RAIN 3 N LANNON 43.19N 88.16W 08/08/2021 M2.34 INCH WAUKESHA WI COCORAHS COCORAHS STATION WI-WK-73 MENOMONEE FALLS 3.2 NNW. 0700 AM HEAVY RAIN 1 E GERMANTOWN 43.23N 88.10W 08/08/2021 M3.38 INCH WASHINGTON WI PUBLIC 0700 AM HEAVY RAIN 6 WNW LA VALLE 43.63N 90.24W 08/08/2021 M2.73 INCH SAUK WI COCORAHS COCORAHS STATION WI-SK-25 WONEWOC 2.0 SSW. 0700 AM HEAVY RAIN 2 W BUTLER 43.11N 88.12W 08/08/2021 M2.84 INCH WAUKESHA WI COCORAHS COCORAHS STATION WI-WK-97 MENOMONEE FALLS 2.6 S. 0700 AM HEAVY RAIN 4 NW PRINCETON 43.90N 89.18W 08/08/2021 M2.95 INCH MARQUETTE WI COCORAHS COCORAHS STATION WI-MQ-5 NESHKORO 5.0 SSE. 0700 AM HEAVY RAIN 3 WSW WEST BEND 43.41N 88.25W 08/08/2021 M5.33 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-19 WEST BEND 3.4 WSW. 0700 AM HEAVY RAIN 2 ENE THIENSVILLE 43.25N 87.94W 08/08/2021 M4.50 INCH OZAUKEE WI COCORAHS COCORAHS STATION WI-OZ-25 MEQUON 2.7 ENE. 0700 AM HEAVY RAIN 1 SW MARKESAN 43.70N 89.00W 08/08/2021 M3.61 INCH GREEN LAKE WI CO-OP OBSERVER CO-OP OBSERVER STATION RKNW3 0.6 SW MARKESAN. 0700 AM HEAVY RAIN 1 SSW CEDARBURG 43.28N 88.00W 08/08/2021 M4.98 INCH OZAUKEE WI COCORAHS COCORAHS STATION WI-OZ-23 CEDARBURG 1.2 SSW. 0700 AM HEAVY RAIN 2 WNW KEWASKUM 43.53N 88.27W 08/08/2021 M2.60 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-4 KEWASKUM 1.8 WNW. 0700 AM HEAVY RAIN PORT WASHINGTON 43.39N 87.88W 08/08/2021 M2.54 INCH OZAUKEE WI COCORAHS COCORAHS STATION WI-OZ-12 PORT WASHINGTON-COCORAHS. 0700 AM HEAVY RAIN 1 NNW BROWNSVILLE 43.63N 88.50W 08/08/2021 M2.68 INCH DODGE WI COCORAHS COCORAHS STATION WI-DD-27 BROWNSVILLE. 0700 AM HEAVY RAIN 1 NW BROWN DEER 43.18N 87.98W 08/08/2021 M4.38 INCH MILWAUKEE WI COCORAHS COCORAHS STATION WI-MW-43 BROWN DEER 0.8 NW. 0700 AM HEAVY RAIN 3 WNW SLINGER 43.34N 88.34W 08/08/2021 M2.73 INCH WASHINGTON WI COCORAHS COCORAHS STATION WI-WS-30 HARTFORD 2.9 ENE. 0700 AM HEAVY RAIN 2 ENE HORICON 43.45N 88.60W 08/08/2021 M3.00 INCH DODGE WI COCORAHS COCORAHS STATION WI-DD-3 HORICON 2.1 ENE. 0700 AM HEAVY RAIN 1 SSW SAUKVILLE 43.37N 87.95W 08/08/2021 M3.10 INCH OZAUKEE WI COCORAHS COCORAHS STATION WI-OZ-22 SAUKVILLE 0.9 SSW. 0700 AM HEAVY RAIN 2 E WAUWATOSA 43.06N 88.00W 08/08/2021 M3.38 INCH MILWAUKEE WI COCORAHS COCORAHS STATION WI-MW-46 WAUWATOSA 1.9 E. 0700 AM HEAVY RAIN THERESA 43.52N 88.45W 08/08/2021 M3.74 INCH DODGE WI COCORAHS COCORAHS STATION WI-DD-14 THERESA 0.1 ESE. 0700 AM HEAVY RAIN NEWBURG 43.43N 88.04W 08/08/2021 M2.40 INCH OZAUKEE WI COCORAHS COCORAHS STATION WI-OZ-17 WEST BEND 7.3 E. 0704 AM HEAVY RAIN 1 SSE MEQUON 43.22N 87.97W 08/08/2021 E4.50 INCH OZAUKEE WI PUBLIC 0710 AM HEAVY RAIN 1 SW MEQUON 43.22N 88.00W 08/08/2021 M3.50 INCH OZAUKEE WI PUBLIC 0730 AM HEAVY RAIN 4 NW KEKOSKEE 43.57N 88.61W 08/08/2021 M3.28 INCH DODGE WI MESONET MESONET STATION MAYW3 HORICON. 0730 AM HEAVY RAIN BROWN DEER 43.17N 87.98W 08/08/2021 M6.80 INCH MILWAUKEE WI PUBLIC 0800 AM HEAVY RAIN 3 NE NEW BERLIN 43.00N 88.09W 08/08/2021 M2.00 INCH WAUKESHA WI PUBLIC 0937 AM HEAVY RAIN 1 SE WEST ALLIS 43.00N 88.02W 08/08/2021 M2.35 INCH MILWAUKEE WI PUBLIC 0946 AM HEAVY RAIN 1 NW WAUKESHA 43.03N 88.25W 08/08/2021 M2.25 INCH WAUKESHA WI PUBLIC && $$
Environment:
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| SPC Day 1 Outlook 13 UTC | SPC Day 1 Outlook 20 UTC | DVN Sounding Saturday Afternoon | GRB Sounding Saturday Evening |
Messaging:
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| NWS Milwaukee discussing the busy days ahead with multiple chances for severe weather into next week. | Severe Thunderstorm Watch Issued Saturday Afternoon. | Heavy rainfall possible along the lakeshore. | Heavy rainfall possible along the lakeshore. |
Overview
Thunderstorms developed Sunday afternoon and evening along a northward moving warm front and moisture boundary. A few individual thunderstorms developed that produced wind damage in Washington and Sheboygan counties. Otherwise most storms stayed below severe limits.
Radar:
Storms developed across western and southern Wisconsin along a northward moving warm front. Most of the activity stayed below severe limits except for a thunderstorm over Washington and Sheboygan counties that was able to produce damaging wind gusts.
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| Radar loop with warnings issued by NWS Offices for Sunday August 8th. |
Photos:
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| Shelf Cloud in distance from Nicole Pinter | Kewauskum Damage from Fox 6 | Kewauskum Damage from Fox 6 |
Storm Reports
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| SPC Storm Reports for Aug. 8th 2021 | Link to Map of storm reports |
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 734 PM CDT SUN AUG 15 2021 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0507 PM TSTM WND DMG 4 NE ALLENTON 43.45N 88.28W 08/08/2021 WASHINGTON WI TRAINED SPOTTER REPORTS OF A TWO FOOT DIAMETER TREE DOWN ACROSS BEAVER DAM ROAD JUST WEST OF TOWNLINE RD AND A 12 INCH DIAMETER BRANCH DOWN ACROSS TOWNLINE RD. 0511 PM TSTM WND DMG 3 SW KEWASKUM 43.49N 88.27W 08/08/2021 WASHINGTON WI TRAINED SPOTTER ONE FOOT DIAMETER TREE DOWN ACROSS RIDGE RD. ONE QUARTER MILE WEST OF HIGHLAND DR. MULTIPLE SIX INCH DIAMETER BRANCHES DOWN NEARBY AS WELL. 0515 PM TSTM WND DMG 2 WSW KEWASKUM 43.51N 88.26W 08/08/2021 WASHINGTON WI TRAINED SPOTTER POWER POLES SNAPPED AND LINES DOWN AT THE INTERSECTION OF COUNTY ROAD H AND HIGHLAND DRIVE. 0516 PM TSTM WND DMG KEWASKUM 43.52N 88.23W 08/08/2021 WASHINGTON WI BROADCAST MEDIA TREE DOWN AND SPLIT IN KEWASKUM. && $$
Environment:
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| SPC Day 1 Outlook 13 UTC | SPC Day 1 Outlook 20 UTC | DVN Sounding Sunday Evening | GRB Sounding Sunday Evening |
Messaging:
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| NWS Milwaukee discusses continued severe weather threat next few days. | Severe Thunderstorm Watch Issued for Sunday afternoon. |
Overview
Storms started shortly after sunrise as an initial shortwave moved through Wisconsin. Moderate to occassionaly heavy rainfall occurred for much of Monday morning into the early afternoon hours. Then by early afternoon there was enough clearing and decent southerly winds to allow for additional thunderstorms to develop along a weak front that was moving through. These thunderstorms were able to produce multiple tornadoes with the majority of the activity across northern Illinois. However, one tornado was reported in Clinton, Wisconsin with this activity.
Tornado:
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Tornado - Clinton
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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Radar:
Moderate to occasionally heavy rainfall occurred through much of the morning and into the afternoon hours with little in the way of severe weather. Then by the afternoon hours a weak front moving into northern Illinois was able to produce multiple photogenic tornadoes. One tornado occurred in Clinton, WI.
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| Radar loop with warnings issued by NWS Offices for Monday August 9th. |
Photos:
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| View of thunderstorm anvil near Janesville from @JordanWX | View of thunderstorm anvil near Janesville from @JordanWX |
Storm Reports
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| SPC Storm Reports for Aug. 9th 2021 | Link to Map of storm reports |
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 746 PM CDT SUN AUG 15 2021 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0255 PM FUNNEL CLOUD CLINTON 42.56N 88.87W 08/09/2021 ROCK WI PUBLIC PUBLIC REPORTS OF A FUNNEL CLOUD WEST OF CLINTON RELAYED THROUGH THE ROCK COUNTY SHERIFFS OFFICE. STORM CHASER ALSO REPORTED A ROTATING WALL CLOUD 4 MILES WEST OF CLINTON AROUND 2:50 PM. 0258 PM TORNADO 1 N CLINTON 42.58N 88.86W 08/09/2021 ROCK WI PUBLIC MULTIPLE PUBLIC REPORTS OF A TORNADO WITH INTERMITTENT TOUCH DOWNS JUST NORTH OF I-43 ALONG WI WHY 140. 0302 PM TORNADO 3 SE AVALON 42.60N 88.83W 08/09/2021 ROCK WI FIRE DEPT/RESCUE FIRE DEPT REPORTS A TOUCH DOWN NEAR THE INTERSECTION OF SOUTH CARVER ROCK ROAD AND EAST CREEK ROAD. && $$
Environment:
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| SPC Day 1 Outlook 13 UTC | SPC Day 1 Outlook 20 UTC | DVN Sounding Monday Afternoon | GRB Sounding Monday Evening |
Messaging:
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| NWS Milwaukee multiple rounds of storms with main severe threat in southern and southeast Wisconsin. |
Overview
A strong to severe line of thunderstorms developed across far southwestern Wisconsin Tuesday afternoon. As this line moved east it initially had a gust front get out ahead of the main line of storms which resulted in only brief severe gusts. But by the time got east of Madison additional thunderstorms were moving north out of Illinois and this resulted in widespread severe wind gusts occuring over much of southern and southeastern Wisconsin. We-Energies reported over 200,000 customers without power, which was the highest number ever for the company. The environment that day featured near record instability or CAPE based on the soundings from Davenport, IA and Green Bay, WI. This combined with hot surface temps in the 90s set the stage for the strong to severe wind potential to be realized.
Radar:
A complex of storms moved out of Iowa and into southern and central Wisconsin Tuesday afternoon. This complex morphed into a strong to severe line of thunderstorms that marched eastward and gained strength as it approached Lake Michigan. Widespread tree damage and power outages were reported with this line.
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| Radar loop with warnings issued by NWS Offices for Tuesday August 10th. |
Photos
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| Tree damage Whitewater from Andrew Kyllonen | Tree damage in Waukesha from Anita Ward | Limbs on house in Madison from NBC 15 | Tree damage in Madison from Chad Woodward |
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| Damage to metal building near Janesville | Dime size hail in Mineral Point from Michele Hughes | Tree damage Watertown | Trees snapped in La Grange, WI |
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| Tree damage in Waukesha from Michelle Pakula | Overturned boat on Eagle Spring Lake | Possible roof damage in Madison from NBC 15 | Tree damage in La Grange, WI |
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| Shelf Cloud photo from Tracy Campbell in Madison | Shelf Cloud photo from @razgriz23 in Round Lake | Shelf Cloud photo Waukesha | Tree damage in La Grange, WI |
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| Snapped powerlines in Eagle | View of approaching storm from Steve Morschauser in Mukwanago | Tree branch on power line caught on fire in Tosa from Lisa Sink | Tree damage in Spring Green from Jolean Louis |
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| Large tree down in New Berlin from WISN | Tree on house in Wauwatosa from Caroline Reinwald | Tree on car in Riverwest from Caroline Reinwald | Tree on house in Milwaukee from Author Quardeay |
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| Tree uprooted in Verona from Tamara A. | Tree uprooted in Kenosha relayed from Sam Kuffel | Trees snapped in Milwaukee from Nicole Haase | Tree split in Milwaukee from Aliza Werner |
Storm Reports
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| SPC Storm Reports for Aug. 10th 2021 | Link to Map of storm reports |
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 912 PM CDT SUN AUG 15 2021 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0437 PM TSTM WND DMG REWEY 42.84N 90.40W 08/10/2021 IOWA WI 911 CALL CENTER IOWA CO. DISPATCH RELAYS REPORT OF A TREE DOWN ON HUGHIT STREET. TIME ESTIMATED FROM RADAR. 0439 PM TSTM WND DMG BELMONT 42.74N 90.33W 08/10/2021 LAFAYETTE WI 911 CALL CENTER LAFAYETTE CO DISPATCH RELAYS REPORT OF DAMAGE TO HOME CAUSED BY A FALLING TREE. TIME ESTIMATED FROM RADAR. 0445 PM TSTM WND DMG 7 SSE MINERAL POINT 42.78N 90.12W 08/10/2021 LAFAYETTE WI 911 CALL CENTER LAFAYETTE CO DISPATCH RELAYS REPORT OF TREE DOWN ON OLSON LANE. TIME ESTIMATED FROM RADAR. 0447 PM TSTM WND DMG 1 SSE MINERAL POINT 42.85N 90.18W 08/10/2021 IOWA WI 911 CALL CENTER IOWA CO DISPATCH RELAYS REPORT OF A TREE DOWN ON STATE STREET. TIME ESTIMATED FROM RADAR. 0500 PM TSTM WND GST 6 WNW SPRING GREEN 43.21N 90.19W 08/10/2021 M49 MPH SAUK WI ASOS LNR - LONE ROCK. 0505 PM TSTM WND DMG SPRING GREEN 43.18N 90.07W 08/10/2021 SAUK WI PUBLIC SMALL TREE BRANCHES DOWN. 0505 PM TSTM WND DMG SPRING GREEN 43.18N 90.07W 08/10/2021 SAUK WI FIRE DEPT/RESCUE POWER POLES SNAPPED. 0525 PM TSTM WND DMG BLACK EARTH 43.14N 89.75W 08/10/2021 DANE WI EMERGENCY MNGR TREES AND WIRES DOWN. 0530 PM TSTM WND DMG CROSS PLAINS 43.11N 89.65W 08/10/2021 DANE WI EMERGENCY MNGR TREES AND WIRES DOWN. 0535 PM TSTM WND GST 3 ENE MONROE 42.62N 89.59W 08/10/2021 M51 MPH GREEN WI AWOS 0540 PM TSTM WND GST 1 NW WAUNAKEE 43.19N 89.46W 08/10/2021 M50 MPH DANE WI PUBLIC 0542 PM TSTM WND DMG MIDDLETON 43.10N 89.51W 08/10/2021 DANE WI EMERGENCY MNGR TREES AND WIRES DOWN. 0543 PM TSTM WND GST 1 WNW MIDDLETON 43.11N 89.53W 08/10/2021 M51 MPH DANE WI AWOS MDD. 0548 PM TSTM WND GST 1 SSE PORTAGE 43.54N 89.46W 08/10/2021 E60 MPH COLUMBIA WI TRAINED SPOTTER EST 40-60 MPH GUSTS WITH BRANCHES DOWN AND HOUSE STRUCK BY LIGHTNING. 0548 PM TSTM WND GST 1 E SHOREWOOD HILLS 43.08N 89.42W 08/10/2021 M53 MPH DANE WI PUBLIC ON TOP OF BLDG ON UW-MADISON CAMPUS. 0550 PM TSTM WND DMG MADISON 43.08N 89.38W 08/10/2021 DANE WI EMERGENCY MNGR TREES AND WIRES DOWN. 0553 PM TSTM WND GST 3 NNE MAPLE BLUFF 43.14N 89.34W 08/10/2021 M43 MPH DANE WI ASOS MSN - DANE COUNTY REGIONAL AIRPORT. 0554 PM TSTM WND GST 1 W WINDSOR 43.22N 89.35W 08/10/2021 E50 MPH DANE WI PUBLIC 0557 PM TSTM WND DMG OREGON 42.93N 89.38W 08/10/2021 DANE WI EMERGENCY MNGR TREES AND WIRES DOWN. 0600 PM TSTM WND DMG COTTAGE GROVE 43.09N 89.20W 08/10/2021 DANE WI EMERGENCY MNGR TREES AND WIRES DOWN. 0615 PM TSTM WND DMG 2 SW JANESVILLE 42.66N 89.04W 08/10/2021 ROCK WI PUBLIC TREE SPLIT...LARGE LIMB. 0620 PM TSTM WND DMG 5 NNE WATERLOO 43.24N 88.95W 08/10/2021 DODGE WI LAW ENFORCEMENT POWER LINES DOWN IN TOWN OF PORTLAND. 0630 PM TSTM WND DMG 1 S BEAVER DAM 43.46N 88.84W 08/10/2021 DODGE WI LAW ENFORCEMENT POWER LINES DOWN. 0635 PM TSTM WND DMG 1 ENE WATERTOWN 43.20N 88.71W 08/10/2021 DODGE WI PUBLIC MEDIUM SIZE TREE UPROOTED. 0635 PM TSTM WND GST 1 S WATERTOWN 43.17N 88.72W 08/10/2021 M44 MPH JEFFERSON WI AWOS RYV - WATERTOWN. 0635 PM TSTM WND GST 2 ENE EAST TROY 42.80N 88.37W 08/10/2021 M52 MPH WALWORTH WI AWOS 57C. 0640 PM TSTM WND DMG 1 E WHITEWATER 42.83N 88.72W 08/10/2021 WALWORTH WI PUBLIC LARGE BRANCHES DOWN ACROSS EASTERN PORTION OF TOWN. 0650 PM TSTM WND GST 3 SW EAGLE 42.85N 88.53W 08/10/2021 M68 MPH WAUKESHA WI TRAINED SPOTTER 0655 PM TSTM WND DMG 2 SE EAGLE 42.86N 88.43W 08/10/2021 WAUKESHA WI EMERGENCY MNGR LARGE TREE FELL ON HOUSE AND CASUED SIGNIFICANT DAMAGE. 0655 PM TSTM WND DMG EAGLE 42.88N 88.46W 08/10/2021 WAUKESHA WI TRAINED SPOTTER LARGE LIMBS DOWN...POWER OUT AND 0.75 INCH HAIL. 0655 PM TSTM WND GST 2 WSW FOND DU LAC 43.77N 88.49W 08/10/2021 M45 MPH FOND DU LAC WI ASOS FLD. 0658 PM TSTM WND GST 3 SE EAGLE 42.85N 88.43W 08/10/2021 M77 MPH WAUKESHA WI TRAINED SPOTTER LARGE TREES SNAPPED AND UPROOTED. 0700 PM TSTM WND GST PELL LAKE 42.54N 88.36W 08/10/2021 E60 MPH WALWORTH WI PUBLIC BLOOMFIELD...NO POWER. 0703 PM TSTM WND GST 4 SSE SULLIVAN 42.97N 88.55W 08/10/2021 M54 MPH JEFFERSON WI OFFICIAL NWS OBS AT WFO MKX. 0705 PM TSTM WND DMG 2 WSW DOUSMAN 43.00N 88.51W 08/10/2021 WAUKESHA WI AMATEUR RADIO LARGE BRANCHES DOWN ACROSS THE ROAD. 0705 PM TSTM WND DMG 4 E ALLENTON 43.43N 88.26W 08/10/2021 WASHINGTON WI PUBLIC SMALL GARDEN SHED DESTROYED. 0707 PM TSTM WND DMG 1 SSE WAUKESHA 43.00N 88.23W 08/10/2021 WAUKESHA WI PUBLIC DAMAGE TO A BUSINESS MARQUEE SIGN...KNOCKED OVER. 0710 PM TSTM WND GST 1 S OCONOMOWOC 43.09N 88.50W 08/10/2021 M60 MPH WAUKESHA WI NWS EMPLOYEE EST 50-60 MPH GUSTS. 0710 PM TSTM WND DMG 1 SSE WEST BEND 43.41N 88.18W 08/10/2021 WASHINGTON WI PUBLIC ORNAMENTAL TREE UPROOTED...PIC SHARED VIA SOCIAL MEDIA. 0715 PM TSTM WND DMG CAMPBELLSPORT 43.60N 88.29W 08/10/2021 FOND DU LAC WI PUBLIC LARGE TREE LIMBS DOWN...PIC VIA SOCIAL MEDIA. 0715 PM TSTM WND GST 2 N WAUKESHA 43.04N 88.23W 08/10/2021 M47 MPH WAUKESHA WI AWOS UES. 0715 PM TSTM WND DMG BROOKFIELD 43.06N 88.12W 08/10/2021 WAUKESHA WI PUBLIC LARGE TREE SNAPPED. 0715 PM TSTM WND GST 2 NW BURLINGTON 42.69N 88.30W 08/10/2021 M52 MPH RACINE WI AWOS BUU. 0715 PM TSTM WND GST 3 E WEST BEND 43.42N 88.13W 08/10/2021 M44 MPH WASHINGTON WI AWOS 0718 PM TSTM WND DMG WEST ALLIS 43.01N 88.02W 08/10/2021 MILWAUKEE WI PUBLIC LARGE TREE UPROOTED. 0719 PM TSTM WND GST 1 SE GERMANTOWN 43.22N 88.10W 08/10/2021 E55 MPH WASHINGTON WI PUBLIC 0720 PM TSTM WND GST 1 N BRISTOL 42.57N 88.05W 08/10/2021 E50 MPH KENOSHA WI PUBLIC 0720 PM TSTM WND DMG WAUWATOSA 43.06N 88.03W 08/10/2021 MILWAUKEE WI TRAINED SPOTTER LARGE BRANCH 12-15 INCHES IN DIAMETER DOWN. 0729 PM TSTM WND DMG WHITEFISH BAY 43.11N 87.90W 08/10/2021 MILWAUKEE WI PUBLIC LARGE TREE UPROOTED...POWER LINES DOWN. 0730 PM TSTM WND GST BROWN DEER 43.18N 87.97W 08/10/2021 M52 MPH MILWAUKEE WI BROADCAST MEDIA 0730 PM TSTM WND DMG 5 NW CASCADE 43.70N 88.09W 08/10/2021 SHEBOYGAN WI LAW ENFORCEMENT LARGE BRANCHES DOWN. 0730 PM TSTM WND GST 2 E BUTLER 43.11N 88.03W 08/10/2021 M47 MPH MILWAUKEE WI AWOS MWC. 0730 PM TSTM WND DMG 2 NNW KENOSHA 42.62N 87.84W 08/10/2021 KENOSHA WI PUBLIC LARGE TREE UPROOTED. 0733 PM TSTM WND GST 2 WSW SAINT FRANCIS 42.96N 87.90W 08/10/2021 M50 MPH MILWAUKEE WI ASOS MKE. 0739 PM TSTM WND GST 3 E ADELL 43.62N 87.89W 08/10/2021 M55 MPH SHEBOYGAN WI TRAINED SPOTTER NO DAMAGE IN VICINITY. 0740 PM TSTM WND DMG MEQUON 43.23N 87.98W 08/10/2021 OZAUKEE WI EMERGENCY MNGR SPORADIC DOWNED POWER LINES AND OLD/DEAD TREES DOWNED ACROSS SOUTHERN AND EASTERN PORTIONS OF THE COUNTY. 0743 PM TSTM WND GST 2 W NORTH BAY 42.76N 87.81W 08/10/2021 M49 MPH RACINE WI ASOS RAC. && $$
Environment:
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| SPC Day 1 Outlook 13 UTC | SPC Day 1 Outlook 20 UTC | DVN Sounding Early Afternoon Tuesday | GRB Sounding Early Afternoon Tuesday |
Messaging:
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| NWS Highlighting the severe potential for Aug. 10th the day before. | Severe Thunderstorm Watch issued Tuesday afternoon. | Power Outage map from We Energies at 8 pm showing 124,000+ customers without power. More outages arrived later in the evening. |
Overview
Supercell thunderstorms developed over western and southwestern Wisconsin in the afternoon on August 11th. These continued to move east into southern Wisconsin. One particular storm strengthened over western Iowa County producing two tornadoes. These were some of the most viewed tornadoes we've had in our area ever. Multiple storm chasers and storm spotters were on this storm capturing amazing video of the tornadoes as they moved through corn fields.
Tornadoes:
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Tornado - Linden
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Tornado - Mineral Point
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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Radar
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| Radar loop showing supercell thunderstorms forming over western Wisconsin and moving into southern Wisconsin. |
Photos & Video
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| Tornado Northwest of Walkwick near Highway 39 | Funnel Cloud near Cobb, WI | Tornado near Hollandale from Joey Marino | Tornado near Mineral Point from Ethan Mok |
Storm Reports
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| SPC Storm Reports for Aug. 11th 2021 | Link to Map of storm reports |
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 915 PM CDT SUN AUG 15 2021 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0955 AM TSTM WND GST 3 ENE MONROE 42.62N 89.60W 08/11/2021 M37 MPH GREEN WI AWOS AWOS STATION KEFT MONROE. 1035 AM TSTM WND GST 3 N PLEASANT PRAIRIE 42.60N 87.93W 08/11/2021 M58 MPH KENOSHA WI ASOS ASOS STATION KENW KENOSHA AIRPORT. 1035 AM TSTM WND GST 1 WNW BURLINGTON 42.68N 88.30W 08/11/2021 M37 MPH RACINE WI AWOS AWOS STATION KBUU BURLINGTON. 1045 AM TSTM WND GST 1 ENE PLEASANT PRAIRIE 42.56N 87.91W 08/11/2021 M53 MPH KENOSHA WI MESONET MESONET STATION FW3123 PLEASANT PRAIRIE. 1058 AM TSTM WND GST 2 W NORTH BAY 42.77N 87.82W 08/11/2021 M44 MPH RACINE WI ASOS ASOS STATION KRAC RACINE-BATTEN AIRPORT. 0615 PM TORNADO 5 ENE MINERAL POINT 42.89N 90.09W 08/11/2021 IOWA WI TRAINED SPOTTER SPOTTER CONFIRMED BRIEF TORNADO TOUCHDOWN NEAR MINERAL POINT. 0645 PM TSTM WND DMG 2 NE EAGLE LAKE 42.73N 88.10W 08/11/2021 RACINE WI TRAINED SPOTTER MULTIPLE TREES AND A POWER LINE DOWN. && $$
Environment:
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| SPC Day 1 Outlook 13 UTC | SPC Day 1 Outlook 20 UTC | DVN Sounding Early Afternoon Wednesday | GRB Sounding Early Afternoon Wednesday |
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