Overview
A strong area of low pressure north of the International Border lifted a warm front across the Northland the morning of July 26, 2021, and brought a very warm, moist airmass into the region. As the cold front approached during the late afternoon and evening hours, storms developed across north- central Minnesota in this highly-sheared and very unstable airmass. The first storms developed near Red Lake in Grand Fork's CWA and produced a trio of tornadoes before entering into the Duluth CWA in Cass County and producing very large hail near Bena. Storms then moved through the Grand Rapids area producing extensive tree damage before continuing to move to the southeast through the Twin Ports into northwest Wisconsin producing wind damage and hail.
More storms developed behind this initial wave and weren't severe initially. However, once reaching the Twin Ports area, they intensified across northern Douglas County in northwest Wisconsin and brought very large hail to the Poplar area along with areas of tree damage across portions of Douglas, Bayfield, Sawyer and Iron counties before pushing out of the CWA. These storms also produced rainfall of 1.5" to almost 3" near Hayward, although no flooding was reported.
This event occurred with the Duluth radar being offline due to technical issues. Storm spotters were indispensable for this event along with the KMVX and KMPX radars. NWS Duluth would like to thank the spotters for their assistance in this event.
Photos & Video
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| Tree damage in Cohasset (Ryan Jensen photo) |
Tree damage in Cohasset (Ryan Jensen photo) |
Tree damage in Grand Rapids (Ryan Jensen photo) |
Tree damage in Grand Rapids (Ryan Jensen photo) |
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| Tree damage in Grand Rapids (Ryan Jensen photo) |
Tree damage in Grand Rapids (Ryan Jensen photo) |
Tree damage in Grand Rapids (Ryan Jensen photo) |
Tree damage in Grand Rapids (Ryan Jensen photo) |
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| Tree damage in Grand Rapids (Ryan Jensen photo) |
Tree damage in Grand Rapids (Ryan Jensen photo) |
Tree damage in Grand Rapids (Kelly Holmied photo) |
Tree damage in Grand Rapids (Trena Erickson Badilla photo) |
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| Tree damage in Two Harbors (Angela Thompson-Yost photo) |
Tree damage in Two Harbors (Christina Cavallin photo) |
Tree damage in Two Harbors (Michelle Fischer Rogers photo) |
Tree and home damage in Drummond, WI (Troy Swanson photo) |
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| Tree damage near Gordon, WI (Shanna Lee photo) |
2.9" hail in Bena, MN (Lindsay Rooney photo) |
0.8" hail in Duluth (Beth Colyear photo) |
2"+ hail in Superior East End (Autumn Perrin photo) |
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| 3" hail near Poplar, WI (Krista Ault photo) |
3" hail near Maple, WI (Becky Landwehr photo) |
A short video of a wall cloud near Bena, Minnesota. The video was taken in Federal Dam looking northward towards US2/Bena at 6:30PM. This storm had earlier produced a tornado near Red Lake in Beltrami County.
(Video courtesy of Sara Rose)
Radar
Coming soon.
Storm Reports
Click the image above for Storm Reports from around the country.
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DULUTH MN
436 PM CDT TUE JUL 27 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0600 PM TSTM WND DMG WIRT 47.73N 93.96W
07/26/2021 ITASCA MN PUBLIC
A PHOTO WAS RECEIVED OF A SNAPPED POWER POLE
IN WIRT. TIME ESTIMATED BY RADAR.
0612 PM TSTM WND DMG SIDE LAKE 47.67N 93.02W
07/26/2021 ST. LOUIS MN PUBLIC
PHOTOS RECEIVED OF TREE AND DOCK DAMAGE
AROUND SIDE LAKE. TIME ESTIMATED FROM RADAR.
0615 PM HAIL 5 NE SCHLEY 47.41N 94.34W
07/26/2021 E1.50 INCH CASS MN PUBLIC
ESTIMATE AT LEAST PING-PONG BALL SIZE HAIL
PER VIDEOS POSTED ON SNAPCHAT. TIME AND
LOCATION ESTIMATED.
0617 PM TSTM WND DMG 1 SSE JESSIE LAKE 47.59N 93.81W
07/26/2021 ITASCA MN PUBLIC
PHOTOS AND VIDEO RECEIVED OF DAMAGE ALONG
THE SHORE OF JESSIE LAKE. A DOCK WAS
OVERTURNED ALONG WITH A BOAT LIFT. THE
PONTOON BOAT ON THE LIFT WAS ALSO
OVERTURNED.
0634 PM HAIL BENA 47.34N 94.21W
07/26/2021 M3.00 INCH CASS MN PUBLIC
HAIL UP TO 2.9 INCHES MEASURED NEAR BENA.
PHOTO AND REPORT VIA TWITTER. TIME ESTIMATED
FROM RADAR.
0647 PM HAIL 5 NE DEER RIVER 47.40N 93.72W
07/26/2021 M0.70 INCH ITASCA MN TRAINED SPOTTER
DIME SIZE HAIL AND GUSTY WINDS.
0650 PM TSTM WND DMG 3 NW SKIBO 47.52N 92.05W
07/26/2021 ST. LOUIS MN 911 CALL CENTER
TREE DOWN IN BASSETT TOWNSHIP.
0650 PM TSTM WND DMG DEER RIVER 47.33N 93.79W
07/26/2021 ITASCA MN PUBLIC
A FEW TREES WERE REPORTED DOWN IN DEER
RIVER. TIME ESTIMATED BY RADAR.
0655 PM TSTM WND DMG COHASSET 47.26N 93.63W
07/26/2021 ITASCA MN PUBLIC
LARGE PINE TREE UPROOTED. REPORT VIA SOCIAL
MEDIA. TIME ESTIMATED FROM RADAR.
0700 PM TSTM WND DMG 1 WNW ZIM 47.31N 92.63W
07/26/2021 ST. LOUIS MN TRAINED SPOTTER
16 INCH TREE UPROOTED.
0705 PM HAIL 3 E LA PRAIRIE 47.24N 93.42W
07/26/2021 M1.75 INCH ITASCA MN PUBLIC
SEVERAL GOLF BALL-SIZED HAIL BUT MOSTLY
QUARTER-SIZED HAIL. TIME ESTIMATED BY RADAR.
0706 PM HAIL 3 NE LA PRAIRIE 47.26N 93.45W
07/26/2021 U1.00 INCH ITASCA MN PUBLIC
REPORT FROM MPING: QUARTER (1.00 IN.).
0708 PM TSTM WND DMG GRAND RAPIDS 47.23N 93.52W
07/26/2021 ITASCA MN TRAINED SPOTTER
BIG BRANCHES OFF TREES AND A FLAG POLE
SNAPPED IN HALF DUE TO DAMAGING WINDS.
LOCATION APPROXIMATE.
0712 PM TSTM WND GST 1 SSE GRAND RAPIDS 47.22N 93.52W
07/26/2021 M54 MPH ITASCA MN AWOS
AWOS STATION KGPZ GRAND RAPIDS AIRPORT.
0713 PM HAIL 3 S BOVEY 47.24N 93.40W
07/26/2021 M1.00 INCH ITASCA MN COCORAHS
MN-IT-39.
0714 PM HAIL 2 SSW COLERAINE 47.28N 93.44W
07/26/2021 U1.00 INCH ITASCA MN PUBLIC
REPORT FROM MPING: QUARTER (1.00 IN.).
0716 PM HAIL 1 WSW BLACKBERRY 47.17N 93.42W
07/26/2021 U1.00 INCH ITASCA MN PUBLIC
REPORT FROM MPING: QUARTER (1.00 IN.).
0720 PM HAIL BLACKBERRY 47.18N 93.39W
07/26/2021 M1.00 INCH ITASCA MN TRAINED SPOTTER
HAIL STILL FALLING AT TIME OF REPORT.
LOCATION APPROXIMATE.
0720 PM HAIL 2 WSW BOVEY 47.28N 93.43W
07/26/2021 E0.88 INCH ITASCA MN PUBLIC
A FEW BRANCHES DOWN AS WELL.
0728 PM TSTM WND DMG GRAND RAPIDS 47.23N 93.52W
07/26/2021 ITASCA MN TRAINED SPOTTER
LOCATION APPROXIMATE. MARBLE SIZE HAIL,
APPROXIMATELY 9 80 FOOT TALL NORWAY PINE
TREES UPROOTED.
0735 PM TSTM WND GST 4 W TWO HARBORS 47.03N 91.75W
07/26/2021 M41 MPH LAKE MN AWOS
AWOS STATION KTWM TWO HARBORS AIRPORT.
0736 PM TSTM WND DMG 1 SSE TWO HARBORS 47.02N 91.67W
07/26/2021 LAKE MN TRAINED SPOTTER
TOP PART OF A HEALTHY PINE TREE KNOCKED
OVER, PUNCTURING GARAGE ROOF.
0740 PM TSTM WND DMG JACOBSON 47.00N 93.26W
07/26/2021 AITKIN MN 911 CALL CENTER
TREES DOWN IN JACOBSON. FIRE DEPT ALSO
DISPATCHED TO POWERLINE DOWN. TIME RADAR
ESTIMATED.
0751 PM HAIL 2 ENE CULVER 46.94N 92.52W
07/26/2021 M0.75 INCH ST. LOUIS MN TRAINED SPOTTER
PENNY SIZE HAIL AND GUSTY WINDS BUT NO
DAMAGE ASIDE FROM SOME LEAVES BLOWN OFF
TREES.
0758 PM TSTM WND GST DULUTH INTERNATIONAL AI 46.85N 92.20W
07/26/2021 M46 MPH ST. LOUIS MN ASOS
ASOS STATION KDLH DULUTH INTERNATIONAL
AIRPORT.
0801 PM HAIL 4 NNW HERMANTOWN 46.85N 92.28W
07/26/2021 U0.75 INCH ST. LOUIS MN PUBLIC
REPORT FROM MPING: DIME (0.75 IN.).
0802 PM HAIL 1 WSW SAGINAW 46.85N 92.46W
07/26/2021 M0.88 INCH ST. LOUIS MN TRAINED SPOTTER
HAIL AND GUSTY WINDS.
0806 PM HAIL NWS DULUTH 46.84N 92.21W
07/26/2021 M0.50 INCH ST. LOUIS MN OFFICIAL NWS OBS
0808 PM TSTM WND GST 1 SSE DULUTH 46.77N 92.11W
07/26/2021 M42 MPH ST. LOUIS MN MESONET
MESONET STATION MN082 DULUTH I-35 AND
GARFIELD.
0810 PM HAIL 2 NNE DULUTH 46.81N 92.11W
07/26/2021 E1.00 INCH ST. LOUIS MN AMATEUR RADIO
MAINLY PEA TO DIME SIZE HAIL. A FEW QUARTER
SIZE HAILSTONES. TIME ESTIMATED BY SPOTTER.
0810 PM MARINE TSTM WIND 7 SSE FRENCH RIVER 46.81N 91.83W
07/26/2021 M40 MPH LSZ162 MN MESONET
UMD OFFSHORE BUOY 45028 6 SE FRENCH RIVER.
0810 PM TSTM WND DMG 2 WSW LESTER PARK 46.83N 92.07W
07/26/2021 ST. LOUIS MN PUBLIC
LARGE PORTION OF A 50-60 FOOT TREE BROKE
OFF, TAKING OUT POWER LINE.
0811 PM HAIL 4 NE HERMANTOWN 46.84N 92.18W
07/26/2021 U1.00 INCH ST. LOUIS MN PUBLIC
REPORT FROM MPING: QUARTER (1.00 IN.).
0811 PM TSTM WND GST 2 NNW SUPERIOR 46.75N 92.10W
07/26/2021 M62 MPH LSZ145 WI MESONET
MESONET STATION MN081 BLATNIK BRIDGE.
0812 PM MARINE TSTM WIND 1 NNW SUPERIOR 46.73N 92.10W
07/26/2021 M39 MPH DOUGLAS WI MESONET
MESONET STATION MN095 BLATNIK BRIDGE SOUTH.
0815 PM MARINE TSTM WIND 6 SE DULUTH 46.72N 92.03W
07/26/2021 M43 MPH ST. LOUIS MN AWOS
AWOS STATION KDYT DULUTH SKY HARBOR AIRPORT.
0815 PM TSTM WND DMG 3 NE DULUTH 46.81N 92.08W
07/26/2021 ST. LOUIS MN NWS EMPLOYEE
HALF OF A TREE FALLEN OVER A HOUSE. NICKEL
SIZE HAIL. TIME APPROXIMATE.
0818 PM MARINE TSTM WIND 1 ESE DULUTH 46.78N 92.09W
07/26/2021 M51 MPH ST. LOUIS MN MESONET
STATION DULM5 DULUTH HARBOR.
0826 PM TSTM WND DMG SUPERIOR 46.72N 92.09W
07/26/2021 DOUGLAS WI PUBLIC
MULTIPLE REPORTS RECEIVED OF TREES DOWN
AROUND SUPERIOR.
0846 PM MARINE TSTM WIND 5 ENE WASHBURN 46.70N 90.80W
07/26/2021 M43 MPH LSZ121 WI MESONET
MESONET STATION DW6222 LA POINTE.
0855 PM MARINE TSTM WIND 1 E LA POINTE 46.78N 90.77W
07/26/2021 M41 MPH ASHLAND WI AWOS
AWOS STATION K4R5 LA POINTE AIRPORT.
0903 PM MARINE TSTM WIND 5 ENE WASHBURN 46.70N 90.80W
07/26/2021 M48 MPH LSZ121 WI MESONET
UPDATE PREVIOUS REPORT, MAX WIND FROM THIS
LINE OF STORMS. MESONET STATION DW6222 LA
POINTE.
0903 PM TSTM WND DMG GORDON 46.25N 91.80W
07/26/2021 DOUGLAS WI PUBLIC
A PHOTO WAS RECEIVED OF A DOWNED TREE IN
GORDON.
0912 PM HAIL 4 SE SILICA 47.23N 92.95W
07/26/2021 M1.00 INCH ST. LOUIS MN TRAINED SPOTTER
12 MILES SOUTH OF HIBBING.
0945 PM TSTM WND GST 2 ENE HAYWARD 46.02N 91.45W
07/26/2021 M48 MPH SAWYER WI ASOS
ASOS STATION KHYR HAYWARD AIRPORT.
0953 PM TSTM WND GST 3 SW ASHLAND 46.55N 90.92W
07/26/2021 M47 MPH ASHLAND WI ASOS
ASOS STATION KASX ASHLAND AIRPORT.
1003 PM TSTM WND DMG MERCER 46.17N 90.06W
07/26/2021 IRON WI FIRE DEPT/RESCUE
MULTIPLE TREES DOWN IN TOWN OF MERCER. FIRE
DEPT DISPATCHED TO SEVERAL LOCATIONS ACROSS
TOWN.
1057 PM HAIL 5 SE SUPERIOR 46.68N 92.01W
07/26/2021 M1.75 INCH DOUGLAS WI PUBLIC
1100 PM HAIL 1 WSW MAPLE 46.59N 91.75W
07/26/2021 M2.50 INCH DOUGLAS WI COCORAHS
1100 PM HAIL 1 ESE POPLAR 46.58N 91.77W
07/26/2021 M3.00 INCH DOUGLAS WI PUBLIC
SEVERAL 2 TO 3 INCH HAIL STONES. TIME
ESTIMATED.
1100 PM HAIL SUPERIOR 46.72N 92.09W
07/26/2021 M2.00 INCH DOUGLAS WI TRAINED SPOTTER
1100 PM HAIL POPLAR 46.59N 94.70W
07/26/2021 M3.00 INCH CASS MN TRAINED SPOTTER
CORRECTS: ERRONEOUS REPORT PLEASE DISREGARD.
1110 PM HAIL 3 NNW POPLAR 46.63N 91.83W
07/26/2021 M1.50 INCH DOUGLAS WI TRAINED SPOTTER
SPOTTER REPORTED 1 AND 9 SIXTEENTHS INCH
DIAMETER HAIL APPROXIMATELY 1110 PM.
1120 PM HAIL 2 ESE POPLAR 46.58N 91.75W
07/26/2021 E3.00 INCH DOUGLAS WI PUBLIC
PHOTOS OF NUMEROUS LARGE HAILSTONES - BIGGER
THAN A GOLF BALL IN THE PHOTO.
1130 PM HAIL BRULE 46.55N 91.58W
07/26/2021 E1.00 INCH DOUGLAS WI PUBLIC
1138 PM HAIL MAPLE 46.59N 91.72W
07/26/2021 E1.00 INCH DOUGLAS WI TRAINED SPOTTER
1155 PM HAIL 4 NW NAMEKAGON 46.26N 91.10W
07/26/2021 M1.00 INCH BAYFIELD WI TRAINED SPOTTER
1200 AM TSTM WND DMG 3 WNW NAMEKAGON 46.23N 91.10W
07/27/2021 BAYFIELD WI TRAINED SPOTTER
8 INCH TREE DOWN.
1206 AM TSTM WND DMG PORT WING 46.78N 91.39W
07/27/2021 BAYFIELD WI PUBLIC
MULTIPLE TREES REPORTED DOWN IN PORT WING.
TIME ESTIMATED BY RADAR.
1230 AM TSTM WND DMG 4 NW NAMEKAGON 46.25N 91.11W
07/27/2021 BAYFIELD WI TRAINED SPOTTER
TREES DOWN ON POWERLINES CAUSING POWER
OUTAGE. TREE SIZE NOT KNOWN AT THIS TIME.
1234 AM HAIL 3 WNW CLAM LAKE 46.17N 90.98W
07/27/2021 M0.50 INCH BAYFIELD WI CO-OP OBSERVER
HAIL FELL BETWEEN 0034HRS TO 0040HRS.
1245 AM HAIL 2 WSW NAMEKAGON 46.20N 91.08W
07/27/2021 M0.50 INCH BAYFIELD WI TRAINED SPOTTER
TIME ESTIMATED.
0109 AM HAIL HAYWARD 46.01N 91.48W
07/27/2021 M1.25 INCH SAWYER WI TRAINED SPOTTER
HALF DOLLAR SIZED HAIL REPORTED IN HAYWARD.
0131 AM TSTM WND DMG 6 N WINTER 45.90N 91.03W
07/27/2021 SAWYER WI TRAINED SPOTTER
A FEW SMALLER TREES DOWN AND THE TOP OF A
BIGGER TREE DOWN DUE TO DAMAGING WINDS.
0140 AM TSTM WND DMG RADISSON 45.77N 91.22W
07/27/2021 SAWYER WI TRAINED SPOTTER
MULTIPLE PINE TREES UPROOTED.
0533 AM HAIL 1 W WEBB LAKE 46.01N 92.16W
07/27/2021 E0.50 INCH BURNETT WI TRAINED SPOTTER
PEA SIZE HAIL STARTED ABOUT TEN MINUTES
PRIOR TO REPORT. HALF-INCH DIAMETER HAIL AT
TIME WITH HEAVY RAINFALL.
&&
$$
Rain Reports
An overview (above) of the CoCoRaHS reports ending at 9:30AM July 27, 2021. This does not include ASOS/AWOS or COOP reports.
PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE DULUTH MN 1004 AM CDT TUE JUL 27 2021 ...24 HOUR RAINFALL REPORTS ENDING TUESDAY JULY 27 MORNING... LOCATION AMOUNT TIME/DATE PROVIDER ...MINNESOTA... ...AITKIN COUNTY... AITKIN 7.6 SSW 0.42 IN 0800 AM 07/27 COCORAHS ISLE 5.6 NNE 0.18 IN 0700 AM 07/27 COCORAHS 12 N ISLE 0.17 IN 0700 AM 07/27 COOP AITKIN 13.9 SSE 0.08 IN 0700 AM 07/27 COCORAHS HILL CITY RAWS 0.02 IN 0907 AM 07/27 RAWS ...CARLTON COUNTY... WRENSHALL 2.3 S 0.80 IN 0700 AM 07/27 COCORAHS WRENSHALL 2.6 E 0.78 IN 0700 AM 07/27 COCORAHS WRENSHALL 0.75 IN 0800 AM 07/27 UCOOP 1.5 S PLEASANT VALLEY 0.56 IN 0945 AM 07/27 HADS WRENSHALL 9.7 SSE 0.54 IN 0700 AM 07/27 COCORAHS CARLTON 5.6 NE 0.50 IN 0900 AM 07/27 COCORAHS CLOQUET 5.7 SW 0.49 IN 0700 AM 07/27 COCORAHS CLOQUET 5.9 SW 0.47 IN 0700 AM 07/27 COCORAHS 3 E WRIGHT 0.44 IN 0600 AM 07/27 COOP ESKO 0.31 IN 0955 AM 07/27 CWOP BARNUM 4.3 W 0.05 IN 0600 AM 07/27 COCORAHS ...CASS COUNTY... CASS LAKE DNR RAWS 0.85 IN 0901 AM 07/27 RAWS CASS LAKE 0.85 IN 0800 AM 07/27 COOP CHIPPEWA PORT NO. 5 0.35 IN 0915 AM 07/27 RAWS 2.3 SE BALL CLUB 0.08 IN 0915 AM 07/27 HADS 5.9 N BREVIK 0.01 IN 0930 AM 07/27 USGS CASS LAKE US-2 MP 131 T IN 0950 AM 07/27 MNDOT ...COOK COUNTY... SCHROEDER 0.09 IN 0950 AM 07/27 CWOP SEAGULL LAKE RAWS 0.09 IN 0904 AM 07/27 RAWS SUPERIOR QD NO. 4 0.08 IN 0942 AM 07/27 RAWS GRAND MARAIS 4.4 WSW 0.07 IN 0700 AM 07/27 COCORAHS GRAND PORTAGE 0.06 IN 0946 AM 07/27 CWOP GRAND MARAIS 21.7 ENE 0.06 IN 0800 AM 07/27 COCORAHS GRAND MARAIS 4.4 W 0.06 IN 0600 AM 07/27 COCORAHS GRAND MARAIS 0.05 IN 0958 AM 07/27 CWOP GRAND MARAIS 3.8 NNE 0.05 IN 0700 AM 07/27 COCORAHS GRAND PORTAGE RAWS 0.04 IN 0944 AM 07/27 RAWS GRAND MARAIS 10.1 NNW 0.04 IN 0800 AM 07/27 COCORAHS TOFTE 4.9 NE 0.04 IN 0700 AM 07/27 COCORAHS HOVLAND 0.1 NE 0.04 IN 0700 AM 07/27 COCORAHS BRULE RIVER NR HOVLAND 0.01 IN 0945 AM 07/27 HADS LUTSEN 0.01 IN 0845 AM 07/27 HADS GRAND PORTAGE RWIS T IN 0950 AM 07/27 MNDOT ...CROW WING COUNTY... AITKIN 9.6 W 0.21 IN 0800 AM 07/27 COCORAHS CROSBY 1.1 SW 0.07 IN 0700 AM 07/27 COCORAHS TROMMALD 6.1 NW T IN 0800 AM 07/27 COCORAHS ...ITASCA COUNTY... GRAND RAPIDS 6.1 N 1.26 IN 0700 AM 07/27 COCORAHS COLERAINE 0.7 S 1.24 IN 0700 AM 07/27 COCORAHS COLERAINE 1.5 S 1.12 IN 0700 AM 07/27 COCORAHS BOVEY 3.5 S 0.93 IN 0700 AM 07/27 COCORAHS 3.8 S SWAN RIVER 0.92 IN 0945 AM 07/27 HADS WARBA 2.2 NNW 0.83 IN 0700 AM 07/27 COCORAHS DEER RIVER 0.81 IN 0945 AM 07/27 CWOP BOVEY 13.4 N 0.77 IN 0649 AM 07/27 COCORAHS COHASSET 7.6 NNW 0.72 IN 0700 AM 07/27 COCORAHS BOVEY 14.4 NNW 0.65 IN 0800 AM 07/27 COCORAHS BOVEY 15.9 N 0.62 IN 0600 AM 07/27 COCORAHS GRAND RAPIDS 6.1 SSE 0.62 IN 0800 AM 07/27 COCORAHS GRAND RAPIDS 12 N 0.60 IN 0630 AM 07/27 COOP KEEWATIN 0.2 SSE 0.35 IN 0800 AM 07/27 COCORAHS EFFIE RAWS 0.28 IN 0907 AM 07/27 RAWS DEER RIVER 3.7 W 0.26 IN 0800 AM 07/27 COCORAHS CUTFOOT RAWS 0.21 IN 0904 AM 07/27 RAWS DEER RIVER 4.4 WNW 0.17 IN 0800 AM 07/27 COCORAHS GRAND RAPIDS AIRPORT 0.02 IN 0956 AM 07/27 AWOS 4.6 N TACONITE 0.01 IN 0945 AM 07/27 HADS EFFIE MN-1 MILE POST 194 T IN 0645 AM 07/27 MNDOT ...KOOCHICHING COUNTY... LITTLEFORK 0.23 IN 0930 AM 07/27 HADS BIG FALLS 1.0 N 0.08 IN 0730 AM 07/27 COCORAHS INTERNATIONAL FALLS 10.3 E 0.08 IN 0800 AM 07/27 COCORAHS LITTLEFORK RAWS 0.07 IN 0908 AM 07/27 RAWS INTERNATIONAL FALLS 0.6 NW 0.01 IN 0730 AM 07/27 COCORAHS INTERNATIONAL FALLS AIRPORT T IN 0954 AM 07/27 ASOS MARGIE US-71 MP 379 T IN 0910 AM 07/27 MNDOT INDUS T IN 0800 AM 07/27 COOP ...LAKE COUNTY... TWO HARBORS 9.7 NNE 0.79 IN 0700 AM 07/27 COCORAHS TWO HARBORS 3.6 WNW 0.72 IN 0700 AM 07/27 COCORAHS TWO HARBORS 12.3 NE 0.64 IN 0700 AM 07/27 COCORAHS KNIFE RIVER 1.2 N 0.55 IN 0700 AM 07/27 COCORAHS TWO HARBORS 2.1 NW 0.52 IN 0700 AM 07/27 COCORAHS TWO HARBORS 0.46 IN 0700 AM 07/27 COOP BEAVER R NR BEAVER BAY 0.25 IN 0945 AM 07/27 HADS SILVER BAY 0.13 IN 0700 AM 07/27 UCOOP ISABELLA RAWS 0.09 IN 0904 AM 07/27 RAWS 8.4 E BABBITT 0.09 IN 0930 AM 07/27 HADS ELY 8.1 SE 0.06 IN 0700 AM 07/27 COCORAHS WOLF RIDGE 0.05 IN 0700 AM 07/27 COOP SUPERIOR QD NO. 1 0.04 IN 0939 AM 07/27 RAWS 7.9 SE WINTON 0.03 IN 0930 AM 07/27 HADS FERNBERG RAWS 0.02 IN 0913 AM 07/27 RAWS ELY 25 E 0.01 IN 0656 AM 07/27 COOP SILVER CLIFF MN-61 MILE POST T IN 0722 AM 07/27 MNDOT ...PINE COUNTY... AUDUBON CENTER SANDSTONE 6 W 1.98 IN 0915 AM 07/27 HADS HINCKLEY 2.4 N 1.01 IN 0700 AM 07/27 COCORAHS ST. CROIX RAWS 0.56 IN 0915 AM 07/27 RAWS PINE CITY 1.8 ENE 0.10 IN 0700 AM 07/27 COCORAHS BROOK PARK 3.9 S 0.06 IN 0700 AM 07/27 COCORAHS PINE CITY 0.7 SSW 0.04 IN 0700 AM 07/27 COCORAHS HINCKLEY I-35 MILE POST 181 T IN 0950 AM 07/27 MNDOT STURGEON LAKE 7.5 ESE T IN 0600 AM 07/27 COCORAHS ...ST. LOUIS COUNTY... DULUTH 10.4 WNW 1.64 IN 0700 AM 07/27 COCORAHS CLOQUET 8.2 NE 1.50 IN 0600 AM 07/27 COCORAHS DULUTH 1.2 SE 1.41 IN 0500 AM 07/27 COCORAHS DULUTH 1.41 IN 0600 AM 07/27 COCORAHS CLOQUET RIVER NR BURNETT 1.40 IN 0915 AM 07/27 HADS DULUTH 7.4 NNE 1.24 IN 0700 AM 07/27 COCORAHS DULUTH 2.2 WNW 1.23 IN 0700 AM 07/27 COCORAHS DULUTH 4.6 NE 1.20 IN 0800 AM 07/27 COCORAHS DULUTH 6.2 NE 1.19 IN 0700 AM 07/27 COCORAHS AURORA 1.16 IN 0955 AM 07/27 CWOP SAGINAW RAWS 1.15 IN 0908 AM 07/27 RAWS DULUTH 1.9 NNE 1.14 IN 0700 AM 07/27 COCORAHS DULUTH 4.2 NNE 1.12 IN 0800 AM 07/27 COCORAHS DULUTH 6.3 NE 1.12 IN 0900 AM 07/27 COCORAHS NWS DULUTH 1.11 IN 0700 AM 07/27 COOP DULUTH 6.9 NNE 1.08 IN 0700 AM 07/27 COCORAHS CULVER 0.2 W 1.07 IN 0700 AM 07/27 COCORAHS DULUTH INTERNATIONAL AIRPORT 1.05 IN 0955 AM 07/27 ASOS DULUTH 17.6 NNW 1.04 IN 0630 AM 07/27 COCORAHS DULUTH 7.9 WSW 1.00 IN 0700 AM 07/27 COCORAHS DULUTH 4.1 NNE 0.99 IN 0600 AM 07/27 COCORAHS DULUTH 3.6 NE 0.98 IN 0700 AM 07/27 COCORAHS CLOQUET RIVER NR BRIMSON 0.97 IN 0945 AM 07/27 HADS DULUTH 6.0 NE 0.95 IN 0700 AM 07/27 COCORAHS DULUTH 11.8 NNE 0.94 IN 0730 AM 07/27 COCORAHS IRON JUNCTION 3.4 NNW 0.94 IN 0530 AM 07/27 COCORAHS DULUTH 15.4 NNW 0.94 IN 0700 AM 07/27 COCORAHS DULUTH 5.6 NE 0.94 IN 0730 AM 07/27 COCORAHS DULUTH 1.8 NE 0.93 IN 0946 AM 07/27 CWOP DULUTH 4.3 NE 0.92 IN 0600 AM 07/27 COCORAHS DULUTH 3.2 NE 0.92 IN 0700 AM 07/27 COCORAHS DULUTH 3.0 NE 0.90 IN 0730 AM 07/27 COCORAHS DULUTH 2.7 NE 0.87 IN 0700 AM 07/27 COCORAHS DULUTH 1.3 N 0.87 IN 0642 AM 07/27 COCORAHS DULUTH 5.3 NNE 0.85 IN 0800 AM 07/27 COCORAHS MOUNTAIN IRON 2.0 ESE 0.84 IN 0700 AM 07/27 COCORAHS DULUTH 3.9 NE 0.84 IN 0700 AM 07/27 COCORAHS DULUTH 4.2 NE 0.83 IN 0600 AM 07/27 COCORAHS SKIBO RAWS 0.83 IN 0922 AM 07/27 RAWS CANYON 4.6 NNE 0.75 IN 0700 AM 07/27 COCORAHS DULUTH 2 NNE 0.74 IN 1000 AM 07/27 CWOP DULUTH 5.0 WSW 0.73 IN 0800 AM 07/27 COCORAHS COLVIN CREEK NR HOYT LAKES 0.68 IN 0945 AM 07/27 HADS FRENCH RIVER 0.68 IN 0955 AM 07/27 CWOP WRIGHT 9.2 NNE 0.65 IN 0700 AM 07/27 COCORAHS HIBBING 11.6 SSW 0.62 IN 0700 AM 07/27 COCORAHS 3.4 SE LITTLE SWAN 0.60 IN 0945 AM 07/27 HADS 0.5 NW PALMERS 0.59 IN 0845 AM 07/27 HADS 2.1 NW HOYT LAKES 0.53 IN 0915 AM 07/27 HADS 1 NE HIBBING 0.45 IN 1000 AM 07/27 AWS DULUTH 7.9 SW 0.44 IN 0900 AM 07/27 COCORAHS COOK 8NE 0.38 IN 0600 AM 07/27 COOP COTTON 5.7 ESE 0.38 IN 0800 AM 07/27 COCORAHS COTTON 0.35 IN 0700 AM 07/27 COOP HIBBING RAWS 0.35 IN 0907 AM 07/27 RAWS SUPERIOR QD NO. 2 0.35 IN 0939 AM 07/27 RAWS HIBBING 0.8 NNE 0.28 IN 0900 AM 07/27 COCORAHS EVELETH-VIRGINIA AIRPORT 0.25 IN 0955 AM 07/27 AWOS CHISHOLM-HIBBING AIRPORT 0.23 IN 0953 AM 07/27 ASOS 2.4 S MEADOWLANDS 0.21 IN 0945 AM 07/27 HADS 3.8 E EMBARRASS 0.20 IN 0900 AM 07/27 HADS CELINA 2 E 0.19 IN 0900 AM 07/27 COOP 0.5 E FLOODWOOD 0.18 IN 0945 AM 07/27 HADS EMBARRASS 0.12 IN 0600 AM 07/27 COOP 3.7 SE CELINA 0.12 IN 0945 AM 07/27 HADS EMBARRASS 0.10 IN 0900 AM 07/27 HADS 3.1 SW EMBARRASS 0.09 IN 0900 AM 07/27 HADS ORR RAWS 0.09 IN 0908 AM 07/27 RAWS 5.6 S BABBITT 0.09 IN 0900 AM 07/27 HADS COOK 0.08 IN 0947 AM 07/27 CWOP BABBITT 4.4 N 0.06 IN 0700 AM 07/27 COCORAHS 6.0 S BROOKSTON 0.05 IN 0900 AM 07/27 HADS DUNKA RIVER NR BABBITT 0.04 IN 0900 AM 07/27 HADS ELY RAWS 0.04 IN 0904 AM 07/27 RAWS WINTON 0.1 WSW 0.04 IN 0700 AM 07/27 COCORAHS 1.3 S BUYCK 0.03 IN 0945 AM 07/27 HADS 4.4 SE BABBITT 0.03 IN 0900 AM 07/27 HADS KABETOGAMA 1.5 NW 0.03 IN 0700 AM 07/27 COCORAHS ELY 6.0 NNW 0.02 IN 0700 AM 07/27 COCORAHS ANDERSON ROAD RWIS 0.01 IN 0950 AM 07/27 MNDOT DULUTH I-35 AND GARFIELD T IN 0953 AM 07/27 MNDOT COTTON US-53 MP 41 T IN 0950 AM 07/27 MNDOT THOMPSON HILL I-35 MP 248 T IN 0950 AM 07/27 MNDOT MITCHELL BRIDGE MN-169 MP 34 T IN 0950 AM 07/27 MNDOT 1 WSW VIRGINIA T IN 0950 AM 07/27 MNDOT KABETOGAMA 0.7 SSW T IN 0700 AM 07/27 COCORAHS ...WISCONSIN... ...ASHLAND COUNTY... GLIDDEN RAWS 1.23 IN 0900 AM 07/27 RAWS ASHLAND 7.2 SSE 0.99 IN 0746 AM 07/27 COCORAHS ASHLAND 0.5 WNW 0.96 IN 0700 AM 07/27 COCORAHS ASHLAND AIRPORT 0.85 IN 0953 AM 07/27 ASOS 1 SW ASHLAND 0.81 IN 0945 AM 07/27 CWOP ASHLAND 0.6 N 0.64 IN 0800 AM 07/27 COCORAHS ODANAH 1.6 E 0.60 IN 0700 AM 07/27 COCORAHS ODANAH 0.57 IN 0945 AM 07/27 CWOP LA POINTE AIRPORT 0.38 IN 0955 AM 07/27 AWOS 1 SE ASHLAND 0.11 IN 0959 AM 07/27 CWOP ...BAYFIELD COUNTY... CABLE 2.36 IN 1000 AM 07/27 CWOP CLAM LAKE RAWS 2.27 IN 0902 AM 07/27 RAWS CLAM LAKE 4W 2.27 IN 0655 AM 07/27 COOP MELLEN 18.6 SW 2.27 IN 0655 AM 07/27 COCORAHS MASON 6.9 SSE 1.47 IN 0700 AM 07/27 COCORAHS BARNES 2.2 S 1.31 IN 0700 AM 07/27 COCORAHS WASHBURN RAWS 1.21 IN 0902 AM 07/27 RAWS IRON RIVER 3.5 ENE 1.20 IN 0522 AM 07/27 COCORAHS MASON 11.5 WNW 1.07 IN 0800 AM 07/27 COCORAHS WHITTLESEY CREEK 1.06 IN 0820 AM 07/27 UCOOP 3 NE MOQUAH 0.99 IN 0600 AM 07/27 COCORAHS WASHBURN 0.8 N 0.95 IN 0700 AM 07/27 COCORAHS ASHLAND 9.8 W 0.90 IN 0600 AM 07/27 COCORAHS BAYFIELD 5.1 NNW 0.85 IN 0700 AM 07/27 COCORAHS BARNES RAWS 0.84 IN 0906 AM 07/27 RAWS WASHBURN 3.7 NW 0.82 IN 0700 AM 07/27 COCORAHS BAYFIELD 9N 0.61 IN 0700 AM 07/27 COCORAHS BAYFIELD 1.7 SW 0.55 IN 0700 AM 07/27 COCORAHS BAYFIELD FISH HATCHERY 0.51 IN 0800 AM 07/27 COOP 1 W BAYFIELD 0.10 IN 0958 AM 07/27 CWOP SAND ISLAND RAWS 0.10 IN 0921 AM 07/27 RAWS ...BURNETT COUNTY... WEBB LAKE 0.39 IN 0959 AM 07/27 CWOP WEBB LAKE 1.1 W 0.36 IN 0700 AM 07/27 COCORAHS DANBURY 0.35 IN 0955 AM 07/27 CWOP SPOONER 13.1 NW 0.31 IN 0800 AM 07/27 COCORAHS OAKLAND 9.0 ENE 0.19 IN 0700 AM 07/27 COCORAHS WEBSTER 4.4 ENE 0.09 IN 0800 AM 07/27 COCORAHS SPOONER 10.6 WNW 0.06 IN 0800 AM 07/27 COCORAHS GRANTSBURG 0.6 SW (KWIGRANT1 0.05 IN 0701 AM 07/27 COCORAHS GRANTSBURG 0.6 SSW 0.04 IN 0700 AM 07/27 COCORAHS LIND RAWS 0.02 IN 0906 AM 07/27 RAWS ...DOUGLAS COUNTY... 1 WSW GORDON 1.75 IN 0700 AM 07/27 COCORAHS POPLAR 2.0 E 1.35 IN 0700 AM 07/27 COCORAHS POPLAR 1.34 IN 0945 AM 07/27 CWOP SOLON SPRINGS 8.1 W 1.29 IN 0600 AM 07/27 COCORAHS LAKESIDE 0.95 IN 0946 AM 07/27 CWOP SUPERIOR 2.0 WNW 0.92 IN 0530 AM 07/27 COCORAHS SUPERIOR 4.3 W 0.76 IN 0700 AM 07/27 COCORAHS SUPERIOR 14.8 S 0.70 IN 0700 AM 07/27 COCORAHS SUPERIOR AIRPORT 0.68 IN 0955 AM 07/27 AWOS POPLAR 7.8 SSW 0.61 IN 0700 AM 07/27 COCORAHS BLATNIK BRIDGE SOUTH T IN 0958 AM 07/27 MNDOT ...IRON COUNTY... MERCER 0.4 N 0.81 IN 0800 AM 07/27 COCORAHS HURLEY 0.65 IN 0800 AM 07/27 COOP PENCE 0.1 E 0.63 IN 0700 AM 07/27 COCORAHS HURLEY 4.1 SSE 0.58 IN 0700 AM 07/27 COCORAHS MERCER 7.0 NNE 0.57 IN 0700 AM 07/27 COCORAHS ...PRICE COUNTY... PHILLIPS 0.4 SSW 1.95 IN 0700 AM 07/27 COCORAHS PHILLIPS AIRPORT 1.91 IN 0955 AM 07/27 AWOS BUTTERNUT 3 SW 1.85 IN 0600 AM 07/27 COOP PHILLIPS 1.3 S 1.77 IN 0600 AM 07/27 COCORAHS PHILLIPS 8.6 W 1.58 IN 0800 AM 07/27 COCORAHS PARK FALLS 1.3 N 1.57 IN 0700 AM 07/27 COCORAHS BRANTWOOD 2.5 S 1.56 IN 0700 AM 07/27 COCORAHS BUTTERNUT 5.9 SW 1.40 IN 0630 AM 07/27 COCORAHS SMITH RAPIDS RAWS 0.92 IN 0947 AM 07/27 RAWS BRANTWOOD 7.4 S 0.72 IN 0400 AM 07/27 COCORAHS ...SAWYER COUNTY... HAYWARD AIRPORT 2.76 IN 0953 AM 07/27 ASOS HAYWARD RAWS 2.10 IN 0903 AM 07/27 RAWS HAYWARD 9.7 NE 1.09 IN 0800 AM 07/27 COCORAHS ...WASHBURN COUNTY... STONE LAKE 2.0 NW 1.97 IN 0700 AM 07/27 COCORAHS SARONA 6.8 ENE 0.54 IN 0800 AM 07/27 COCORAHS MINONG RAWS 0.21 IN 0903 AM 07/27 RAWS SHELL LAKE 4.3 SW 0.20 IN 0900 AM 07/27 COCORAHS SARONA 4.5 NNE 0.19 IN 0700 AM 07/27 COCORAHS SARONA 4.9 E 0.12 IN 0700 AM 07/27 COCORAHS SPOONER 0.08 IN 0700 AM 07/27 COCORAHS ...MARITIME STATIONS... SUPERIOR 2 ENE 1.62 IN 1158 PM 07/26 COOP SUPERIOR 3.7 WNW 0.77 IN 0700 AM 07/27 COCORAHS BAYFIELD 0.51 IN 0930 AM 07/27 CWOP 2.8 NE OLIVER 0.36 IN 0900 AM 07/27 HADS LA POINTE 0.30 IN 0946 AM 07/27 CWOP OBSERVATIONS ARE COLLECTED FROM A VARIETY OF SOURCES WITH VARYING EQUIPMENT AND EXPOSURES. WE THANK ALL VOLUNTEER WEATHER OBSERVERS FOR THEIR DEDICATION. NOT ALL DATA LISTED ARE CONSIDERED OFFICIAL. $$
Environment
Low pressure was located over central North Dakota during the afternoon hours with a warm front draped east into the Northland, generally from the Brainerd Lakes region east into northwest Wisconsin. Along and south of this boundary, the airmass was strongly unstable, with surface based CAPE values over 2000 J/Kg and models indicating upwards of over 3000 J/Kg by the evening hours. Upstream soundings from the morning showed an elevated mixed layer that moved into the Northland through the day. This was also evident as a drier area on satellite imagery. The EML lead to steep lapse rates in the mid levels in addition to producing capping in the lower levels during the afternoon. Model soundings showed long hodograph by the evening with moderate to strong winds aloft to help lengthen it, despite the weaker winds in the boundary layer. This lead to an environment very conducive to severe storms producing very large hail and strong winds should storms develop. Models were wildly inconsistent in depicting this event, with the NAMNest and FV3SAR showing development over northwest Minnesota and eastern North Dakota by 01Z, then sliding southeast across the forecast area, but the HRRR did not developing anything until after 03Z, and with much less coverage than either of the other models. Uncertainty in timing and evolution was still pretty high even as of late afternoon. Storms did develop after 22Z over Beltrami County and pushed southeastward across the region, roughly along the warm front, impacting areas along US 2 from Cass Lake into the Twin Ports and across northwest Wisconsin, and produced very large hail to around 3" in diameter and causing extensive damage, especially in Grand Rapids.
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| 21Z (4 PM CDT) 300 hPa SPC Mesoanalysis | 21Z (4 PM CDT) 500 hPa SPC Mesoanalysis | 21Z (4 PM CDT) 850 hPa SPC Mesoanalysis |
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| WPC 21Z (4 PM CDT) Surface Analysis | 21Z (4 PM CDT) Surface-Based CAPE from SPC Mesoanalysis | 21Z (4 PM CDT) 0-6 km Bulk Shear from SPC Mesoanalysis |
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| 21Z (4 PM CDT) Effective Bulk Shear from SPC Mesoanalysis | 21Z (4 PM CDT) Supercell Composite Parameter from SPC Mesoanalysis | 21Z (4 PM CDT) SigHail Parameter from SPC Mesoanalysis |
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| 21Z (4 PM CDT) Hail Parameters from SPC Mesoanalysis | 00Z (7 PM CDT) 250 hPa SPC analysis | 00Z (7 PM CDT) 500 hPa SPC analysis |
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| Figure 13: 00Z (7 PM CDT) Minneapolis Sounding |
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