The potential for heavy snow at higher elevations in the western U.S. will continue for many spots through the weekend. In the meantime, the eastern half of the continental U.S. will transition to above normal temperatures ahead of a pair of cold fronts next week that will bring readings back to closer to normal as we approach Thanksgiving Day. Read More >
Overview
Saturday, July 16th was an active day across central and northeastern South Dakota and west central Minnesota. Several rounds of storms impacted different areas throughout the course of the day, starting around noon and ending around midnight. When all was said and done, many had reported large hail, damaging straight line winds, and even a tornado/funnel clouds.Tornadoes:
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Tornado - 7 S Clark
Track Map  
Downloadable KMZ File |
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| Brief Tornado near Clark, SD - Photo by Bradley Winger | Wall cloud west of Clark - Photo by Bradley Winger | In the Bryant/Vienna area - Photo by Isaac Polanski |
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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Wind & Hail:
Wind
Dangerous high thunderstorm winds were the main story with Saturday's event as three distinct rounds developed throughout the day. The first raced east as a squall line from Edmunds through Grant County during the early afternoon. Wind gusts to 70 mph were reported consistently, including in Aberdeen where several instances of damage resulted. The next developed across Clark County during the evening hours as a supercell. Strong downdraft winds of 70+ mph struck the Lake Poinsett area, tipping several campers. Finally, around and after sunset, another intense line of storms developed across much of north central South Dakota. Many ~70 mph wind gusts, along with damage, were reported before it dissipated in Brown County after midnight.
Aberdeen Area
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| Damage to a hanger at the Aberdeen Airport | Tree down on a garage in Aberdeen | Shelf cloud as seen a couple miles south of Aberdeen. Photo by Tina Urdahl. |
Brown/Day County
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| 6 miles south of Groton - Video taken by Chad Johnson | Damage to a shed north of Bath | Shelf cloud located 6 miles west of Bristol - Photo by Amanda Hill |
Hamlin County
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| Damage on Lake Poinsett - Photo by Dave Schaefer | Damage on Lake Poinsett - Photo by Dave Schaefer | Damage on Lake Poinsett - Photo by Dave Schaefer | Damage on Lake Poinsett - Photo by Dave Schaefer |
Hail
Large hail was also an issue, particularly with a supercell thunderstorm which impacted those roughly from Clark to Estelline. Reports of up to tennis ball sized (2.5") hail fell in that corridor. Additional storms with large hail impacted parts of Day through Traverse/Big Stone counties, as well as others across the area.
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| Near Clark, SD: Derek Thompson | Wilmot, SD: Becky Harstad |
Radar:
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| Radar Image as the storm was exiting Aberdeen - 3:36 PM | Radar Image as the storm continued east through Day County - 4:25 PM | Radar image and cross-section of the supercell thunderstorm in Clark County at 8:24 PM | Radar Image of the squall line across north central South Dakota at 10:34 PM |
Storm Reports
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Find the above map at http://www.spc.noaa.gov/climo/gmf.php?rpt=160716_rpts_filtered
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE ABERDEEN SD 508 AM CDT SUN JUL 17 2016 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0147 PM TSTM WND GST 2 E MOBRIDGE 45.54N 100.40W 07/16/2016 M60 MPH WALWORTH SD ASOS . 0225 PM HAIL 5 WSW LOYALTON 45.26N 99.36W 07/16/2016 E1.00 INCH EDMUNDS SD PUBLIC NO DAMAGE APPARENT AT TIME OF CALL. 0230 PM HAIL 2 NNW LOYALTON 45.31N 99.29W 07/16/2016 E0.75 INCH EDMUNDS SD PUBLIC TIME ESTIMATED BY RADAR. 0330 PM TSTM WND DMG ABERDEEN 45.47N 98.48W 07/16/2016 BROWN SD EMERGENCY MNGR SEVERAL TREES DOWNED ALONG WITH POWER LINES MAINLY IN SOUTHWEST ABERDEEN. A HANGER WALL AT THE AIRPORT ALSO DAMAGED. . 0335 PM TSTM WND GST 3 ESE ABERDEEN 45.45N 98.42W 07/16/2016 M73 MPH BROWN SD ASOS . 0340 PM TSTM WND DMG 3 N BATH 45.52N 98.32W 07/16/2016 BROWN SD EMERGENCY MNGR LARGE MACHINE SHED RECEIVED MAJOR DAMAGE TO A WALL AND THE ROOF. . 0400 PM TSTM WND GST 2 NE FERNEY 45.35N 98.06W 07/16/2016 E60 MPH BROWN SD PUBLIC SOME OF THE CORN CROP IS TWISTED, TORN AND BENT OVER. 0420 PM HAIL 8 S KELDRON 45.81N 101.81W 07/16/2016 E1.00 INCH CORSON SD PUBLIC NICKEL TO QUARTER SIZE HAIL WITH HEAVY RAIN. 0425 PM TSTM WND GST BRISTOL 45.35N 97.76W 07/16/2016 M77 MPH DAY SD TRAINED SPOTTER ROAD SIGN BENT SIDEWAYS AND ZERO VISIBILITY. 0500 PM TSTM WND GST 1 NNW WAUBAY 45.34N 97.31W 07/16/2016 E65 MPH DAY SD STORM CHASER .
0517 PM TSTM WND GST 5 ENE ORTLEY 45.35N 97.11W 07/16/2016 E60 MPH ROBERTS SD PUBLIC
0525 PM TSTM WND GST 1 S SUMMIT 45.29N 97.04W 07/16/2016 M76 MPH GRANT SD MESONET . 0720 PM HAIL 2 N WILMOT 45.44N 96.86W 07/16/2016 M1.50 INCH ROBERTS SD PUBLIC RELAYED VIA SOCIAL MEDIA. RADAR ESTIMATED TIME. 0740 PM HAIL 2 SSW RAYMOND 44.88N 97.95W 07/16/2016 E1.00 INCH CLARK SD LAW ENFORCEMENT . 0742 PM FUNNEL CLOUD 2 S RAYMOND 44.88N 97.94W 07/16/2016 CLARK SD LAW ENFORCEMENT . 0745 PM HAIL 5 NW CLARK 44.93N 97.81W 07/16/2016 U1.00 INCH CLARK SD PUBLIC . 0750 PM HAIL 5 W CLARK 44.88N 97.84W 07/16/2016 E1.75 INCH CLARK SD PUBLIC WALL CLOUD STILL VISIBLE. 0812 PM FUNNEL CLOUD 3 S CLARK 44.84N 97.73W 07/16/2016 CLARK SD LAW ENFORCEMENT . 0819 PM HAIL 3 S CLARK 44.84N 97.73W 07/16/2016 E1.75 INCH CLARK SD LAW ENFORCEMENT . 0820 PM HAIL 5 S CLARK 44.80N 97.73W 07/16/2016 E2.50 INCH CLARK SD STORM CHASER . 0823 PM TORNADO 7 S CLARK 44.78N 97.73W 07/16/2016 CLARK SD LAW ENFORCEMENT . 0845 PM HAIL 3 ESE NAPLES 44.76N 97.46W 07/16/2016 E1.75 INCH HAMLIN SD LAW ENFORCEMENT . 0908 PM HAIL FORT PIERRE 44.36N 100.38W 07/16/2016 E1.00 INCH STANLEY SD PUBLIC . 0908 PM TSTM WND GST 3 E FIRESTEEL 45.43N 101.22W 07/16/2016 E65 MPH DEWEY SD PUBLIC . 0938 PM HAIL 2 W LAKE NORDEN 44.58N 97.25W 07/16/2016 E1.00 INCH HAMLIN SD EMERGENCY MNGR HAIL ACCOMPANIED BY 45-50 MPH WIND GUSTS. 0938 PM TSTM WND GST 4 W TRAIL CITY 45.47N 100.81W 07/16/2016 M71 MPH DEWEY SD MESONET . 0945 PM TSTM WND GST 6 NE TRAIL CITY 45.54N 100.64W 07/16/2016 E60 MPH CORSON SD LAW ENFORCEMENT . 0951 PM HAIL 3 E LAKE NORDEN 44.59N 97.15W 07/16/2016 E1.00 INCH HAMLIN SD STORM CHASER . 0951 PM HAIL 3 ENE LAKE NORDEN 44.60N 97.15W 07/16/2016 E1.00 INCH HAMLIN SD STORM CHASER . 0954 PM TSTM WND GST 4 SE LAKE NORDEN 44.54N 97.16W 07/16/2016 E60 MPH HAMLIN SD EMERGENCY MNGR . 0958 PM TSTM WND GST MOBRIDGE 45.54N 100.44W 07/16/2016 E70 MPH WALWORTH SD LAW ENFORCEMENT . 1000 PM HAIL 4 SSW STONE BRIDGE 44.55N 97.10W 07/16/2016 E1.00 INCH HAMLIN SD PUBLIC . 1003 PM TSTM WND GST 1 ENE MOBRIDGE 45.55N 100.41W 07/16/2016 M64 MPH WALWORTH SD ASOS MOBRIDGE ASOS. 1005 PM TSTM WND GST 1 SSE MAHTO 45.74N 100.66W 07/16/2016 M79 MPH CORSON SD MESONET WINDS IN EXCESS OF 60MPH BEGAN AT APPROX 955PM CDT AND CONTINUED THROUGH 1010PM CDT. PEAK WIND OF 79MPH AT 1005PM CDT. 1005 PM TSTM WND GST AKASKA 45.33N 100.12W 07/16/2016 E60 MPH WALWORTH SD LAW ENFORCEMENT . 1020 PM TSTM WND GST 3 N GANN VALLEY 44.08N 98.99W 07/16/2016 M60 MPH BUFFALO SD MESONET . 1028 PM TSTM WND GST POLLOCK 45.90N 100.29W 07/16/2016 E70 MPH CAMPBELL SD LAW ENFORCEMENT .
1036 PM TSTM WND DMG 9 N ONAKA 45.33N 99.49W 07/16/2016 EDMUNDS SD NWS EMPLOYEE FEW SHINGLES BLOWN OFF ROOF, LARGE TREE LIMB DOWN BLOCKING ROAD. RADAR ESTIMATED TIME. 1038 PM TSTM WND GST 2 N HERREID 45.87N 100.07W 07/16/2016 M65 MPH CAMPBELL SD MESONET . 1101 PM TSTM WND GST 2 W ROSCOE 45.45N 99.37W 07/16/2016 M72 MPH EDMUNDS SD EMERGENCY MNGR MEASURED WITH HAND-HELD DEVICE. 1110 PM TSTM WND GST 10 SW LONG LAKE 45.77N 99.36W 07/16/2016 M73 MPH MCPHERSON SD MESONET . 1120 PM TSTM WND GST CRAVENS CORNER 45.45N 98.93W 07/16/2016 M64 MPH EDMUNDS SD MESONET . 1139 PM TSTM WND GST 5 SSW RICHMOND LAKE REC 45.47N 98.64W 07/16/2016 M59 MPH BROWN SD MESONET . 1149 PM TSTM WND GST 1 WNW MELLETTE 45.16N 98.51W 07/16/2016 M56 MPH SPINK SD MESONET .
Rain Reports
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