Heavy rainfall from scattered thunderstorms is expected across the Southwest, Intermountain West, and Plains. Isolated dry thunderstorms may initiate additional fires across the west. The coastal Carolinas may experience flash floods in the coming days due to repeated thunderstorms. Additionally, a wave of intense summer heat will hit the Southern Plains and central Gulf Coast States this week. Read More >
Overview
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A bowing line of storms developed in north central Nebraska and south central South Dakota late Saturday evening. This line pushed across southeast South Dakota overnight, weakening as it moved into southwest Minnesota and northwest Iowa early Sunday morning. Widespread reports of 55 to 70 mph winds were received, with the highest winds focused near the I-90 corridor between Chamberlain and Alexandria, SD. The winds resulted in mainly tree damage, with isolated reports of damage to grain bins and metal buildings. |
 Radar Image at the time of outbuilding damage southeast of Armour. |
Wind Damage:
Widespread reports of 55 to 70 mph winds were received, with the highest wind reports focused near the I-90 corridor between Chamberlain and Alexandria, SD.
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| Farm outbuildings damaged southeast of Armour (photos courtesy Douglas County Emergency Management) | |||
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| Mitchell, SD (M. Culhane) |
Montrose, SD (J.B. Hagemann) |
Dell Rapids, SD (K. Larson) |
Parker, SD (S. Merrill) |
Inwood, IA (A. Evans) |
Lake Park, IA (M. Ehret) |
Radar & Warnings
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| Radar Loop from 10 pm Saturday Evening to 4 am Sunday morning | Map of Severe Thunderstorm Warnings issued by NWS Sioux Falls |
Storm Reports
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1229 PM CDT SUN AUG 9 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1255 PM TSTM WND GST MINNEOTA 44.56N 95.98W
08/08/2020 E60 MPH LYON MN PUBLIC
REPORT VIA SOCIAL MEDIA.
0109 PM TSTM WND DMG 6 ENE MINNEOTA 44.61N 95.87W
08/08/2020 LYON MN TRAINED SPOTTER
LARGE TREE TOPPLED ON FARMSTEAD.
0109 PM TSTM WND GST 2 W MARSHALL 44.46N 95.83W
08/08/2020 M51 MPH LYON MN AWOS
0114 PM TSTM WND GST 1 NE MARSHALL 44.46N 95.78W
08/08/2020 M55 MPH LYON MN MESONET
1159 PM TSTM WND GST 14 W PLATTE 43.39N 99.12W
08/08/2020 M60 MPH CHARLES MIX SD MESONET
1214 AM TSTM WND GST 2 WSW PICKSTOWN 43.06N 98.56W
08/09/2020 M60 MPH GREGORY SD MESONET
1215 AM TSTM WND GST 3 S CHAMBERLAIN 43.77N 99.32W
08/09/2020 M67 MPH BRULE SD ASOS
1224 AM TSTM WND GST 1 S KIMBALL 43.74N 98.96W
08/09/2020 M58 MPH BRULE SD MESONET
1228 AM TSTM WND DMG 4 SE ARMOUR 43.29N 98.29W
08/09/2020 DOUGLAS SD EMERGENCY MNGR
SEVERAL FARM OUTBUILDINGS.
1239 AM TSTM WND GST 5 NNE STICKNEY 43.65N 98.39W
08/09/2020 M68 MPH AURORA SD MESONET
PERSONAL WEATHER STATION KSDPLANK3.
1241 AM TSTM WND GST 12 SSW WESSINGTON SPRIN 43.91N 98.64W
08/09/2020 M60 MPH AURORA SD MESONET
PERSONAL WEATHER STATION (KSDWESSI5).
1257 AM TSTM WND GST WESSINGTON SPRINGS 44.08N 98.57W
08/09/2020 E60 MPH JERAULD SD PUBLIC
BRANCHES DOWN WITH TREE DEBRIS BLOWN ACROSS
THE STREET. ESTIMATED WIND SPEED OF 60 MPH.
1259 AM TSTM WND GST 3 SE MITCHELL 43.70N 97.98W
08/09/2020 M72 MPH DAVISON SD MESONET
PERSONAL WEATHER STATION (KSDMITCH21).
1259 AM TSTM WND GST LANE 44.07N 98.43W
08/09/2020 M56 MPH JERAULD SD MESONET
PERSONAL WEATHER STATION (KSDLANE2).
0104 AM TSTM WND GST 1 NNW ALEXANDRIA 43.66N 97.79W
08/09/2020 E65 MPH HANSON SD STORM CHASER
MEASURED WIND GUST TO 65 MPH.
0105 AM TSTM WND GST 5 ESE TYNDALL 42.97N 97.77W
08/09/2020 M58 MPH BON HOMME SD MESONET
0110 AM TSTM WND GST 4 ESE FORESTBURG 44.01N 98.03W
08/09/2020 M60 MPH SANBORN SD MESONET
0114 AM TSTM WND GST 3 N MITCHELL 43.77N 98.03W
08/09/2020 M54 MPH DAVISON SD ASOS
KMHE ASOS.
0125 AM TSTM WND GST 5 SSE CANOVA 43.81N 97.48W
08/09/2020 M53 MPH MCCOOK SD MESONET
PERSONAL WEATHER STATION (KSDCANOV2).
0128 AM TSTM WND GST 1 N HURON 44.38N 98.22W
08/09/2020 M56 MPH BEADLE SD ASOS
KHON ASOS.
0132 AM TSTM WND DMG 5 ESE CANISTOTA 43.57N 97.19W
08/09/2020 MCCOOK SD PUBLIC
TREE BRANCHES DOWN AND GRAIN BIN LIDS RIPPED
OFF. TIME ESTIMATED BASED ON RADAR. REPORTED
VIA SOCIAL MEDIA.
0133 AM TSTM WND GST 3 E CAVOUR 44.37N 97.98W
08/09/2020 E54 MPH BEADLE SD MESONET
0209 AM TSTM WND GST 3 SE MONTROSE 43.67N 97.15W
08/09/2020 M51 MPH MCCOOK SD MESONET
0222 AM TSTM WND DMG INWOOD 43.29N 96.44W
08/09/2020 LYON IA PUBLIC
CORRECTS PREVIOUS TSTM WND DMG REPORT FROM
INWOOD. SNAPPED TREE SEVERAL FEET OFF THE
GROUND. TIME ESTIMATED BASED ON RADAR.
RECEIVED VIA SOCIAL MEDIA.
0235 AM TSTM WND GST 1 SSE SIOUX CENTER 43.06N 96.16W
08/09/2020 M50 MPH SIOUX IA MESONET
PERSONAL WEATHER STATION (KIASIOUX79).
0325 AM TSTM WND GST 3 SSE LAKE PARK 43.40N 95.31W
08/09/2020 M50 MPH DICKINSON IA EMERGENCY MNGR
0337 AM TSTM WND GST 4 WNW SPENCER 43.17N 95.22W
08/09/2020 M51 MPH CLAY IA ASOS
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