Overview
On August 9, 2020, severe thunderstorms moved through portions of the region, with a variety of hail, strong winds, and even tornadoes.
Tornadoes
Will be updated later as more information becomes available.
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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Storm Reports
Storm reports across the area: Green H=Hail, Blue W=Damaging Wind, Red T=Tornado
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE GRAND FORKS ND 837 PM CDT SUN AUG 9 2020 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 1040 AM HAIL 5 NE WHITMAN 48.21N 98.04W 08/09/2020 E0.75 INCH WALSH ND PUBLIC PEA TO DIME SIZED HAIL. 1045 AM HAIL 5 W FORDVILLE 48.22N 97.90W 08/09/2020 E1.00 INCH WALSH ND PUBLIC 1045 AM HAIL 8 W FORDVILLE 48.22N 97.97W 08/09/2020 E1.00 INCH WALSH ND PUBLIC 1143 AM HAIL 5 WNW OSNABROCK 48.70N 98.25W 08/09/2020 E1.00 INCH CAVALIER ND PUBLIC NICKEL TO QUARTER SIZED HAIL AND VERY HEAVY RAIN. 1205 PM HAIL 1 S MOUNTAIN 48.67N 97.86W 08/09/2020 E1.25 INCH PEMBINA ND TRAINED SPOTTER A FEW HAIL LARGER THAN QUARTERS. MOST WERE DIME TO NICKEL SIZED. 0112 PM HAIL 2 N LANCASTER 48.89N 96.80W 08/09/2020 E1.00 INCH KITTSON MN PUBLIC SOME LARGE HAIL ALONG WITH VERY STRONG WINDS AND VERY HEAVY RAIN. 0157 PM TSTM WND GST 5 WNW GRAND FORKS 47.94N 97.17W 08/09/2020 M54 MPH GRAND FORKS ND ASOS PEAK WIND MEASURED AT THE GRAND FORKS AIRPORT /KGFK/. 0158 PM TSTM WND GST 5 WNW GRAND FORKS 47.94N 97.17W 08/09/2020 M64 MPH GRAND FORKS ND ASOS PEAK WIND MEASURED AT THE GRAND FORKS AIRPORT /KGFK/. 0212 PM FUNNEL CLOUD 5 SW ORISKA 46.88N 97.86W 08/09/2020 BARNES ND 911 CALL CENTER FUNNEL VIEWED FROM INTERSTATE 94. 0213 PM TORNADO 12 W THIEF RIVER FALLS 48.11N 96.44W 08/09/2020 PENNINGTON MN TRAINED SPOTTER POSSIBLE BRIEF TORNADO TOUCHDOWN AS VIEWED FROM HIGHWAY 1, WEST OF THIEF RIVER FALLS. 0217 PM TORNADO 6 SSW ORISKA 46.85N 97.84W 08/09/2020 BARNES ND STORM CHASER REPORT AND PHOTO POSTED VIA SOCIAL MEDIA. 0228 PM FUNNEL CLOUD 4 NW BLANCHARD 47.39N 97.28W 08/09/2020 TRAILL ND TRAINED SPOTTER TWO FUNNELS VIEWED FROM TWO STORMS NORTHWEST OF BLANCHARD. BOTH WERE LESS THAN A QUARTER OF THE WAY DOWN. ORIGINAL REPORT VIA 911 CALL CENTER. PHOTO POSTED TO SOCIAL MEDIA. 0235 PM TSTM WND GST 2 SSW THIEF RIVER FALLS 48.09N 96.19W 08/09/2020 M77 MPH PENNINGTON MN AWOS PEAK WIND MEASURED AT THE THIEF RIVER FALLS AIRPORT /KTVF/. 0237 PM TSTM WND GST 11 S ROSEAU 48.69N 95.76W 08/09/2020 M66 MPH ROSEAU MN MESONET PEAK WIND MEASURED AT AN NDAWN STATION AT 3 METER HEIGHT. 0245 PM FUNNEL CLOUD 4 W HILLSBORO 47.40N 97.15W 08/09/2020 TRAILL ND BROADCAST MEDIA PHOTO,REPORT,AND TIME POSTED VIA SOCIAL MEDIA. FUNNEL VERY CLOSE TO TOUCHDOWN. 0251 PM TSTM WND DMG 4 N MAVIE 48.20N 95.94W 08/09/2020 MARSHALL MN LAW ENFORCEMENT DOORS AND END OF A POLESHED BLOWN OUT. TREES BLOWN DOWN. DEBRIS DAMAGE TO HOUSE AND VEHICLE WINDOWS AND HOUSE SIDING. TIME ESTIMATED BASED ON RADAR. 0257 PM FUNNEL CLOUD 6 WNW HALSTAD 47.38N 96.94W 08/09/2020 TRAILL ND TRAINED SPOTTER PERSISTENT WALL CLOUDS WITH SMALL FUNNEL LOWERING. VIEWED TO NORTH FROM HIGHWAY 200. PHOTO AND REPORT POSTED VIA SOCIAL MEDIA. 0300 PM TSTM WND GST 9 NNE MAVIE 48.27N 95.90W 08/09/2020 M59 MPH MARSHALL MN MESONET PEAK WIND MEASURED AT THE AGASSIZ RAWS STATION. 0330 PM HAIL 2 NNW HARWOOD 47.01N 96.90W 08/09/2020 E0.88 INCH CASS ND STORM CHASER WINDS REPORTED AS BEING FRISKY. 0334 PM TSTM WND GST PROSPER 46.96N 97.02W 08/09/2020 M48 MPH CASS ND MESONET PEAK WINDS MEASURED AT A PERSONAL WEATHER STATION. 0406 PM TSTM WND DMG 7 NNW WASKISH 48.26N 94.57W 08/09/2020 BELTRAMI MN EMERGENCY MNGR LARGE TREES BLOWN DOWN IN THE BIG BOG STATE PARK. MN DNR CALLED IN TO HELP CUT TREES TO ASSIST TRAPPED CAMPERS. 0427 PM TSTM WND DMG 5 S SOLWAY 47.45N 95.13W 08/09/2020 BELTRAMI MN EMERGENCY MNGR MATURE TREES BLOWN DOWN.
Photos
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| Rain Wrapped Circulation near Argusville. Courtesy of Weather Unrated. | Tornado near Valley City, ND. Courtesy of Weather Unrated. | Rain Wrapped Circulation near Argusville. Courtesy of Weather Unrated. |
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| Oak Trees Snapped 5 Miles South of Thief River Falls MN Along Highway 32. Courtesy of Derek and Jess Morgan. | Power Poles Snapped 10 Miles South of Thief River Falls Along Hwy 59, South of County Road 3. Courtesy of Derek and Jess Morgan. | Funnel Near Hillsboro ND. Courtesy of Hillsboro Banner. |
Radar
Rainfall
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE GRAND FORKS ND 914 AM CDT MON AUG 10 2020 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0700 AM HEAVY RAIN 6 SE MAPLE BAY 47.59N 96.13W 08/10/2020 M1.72 INCH POLK MN COCORAHS COCORAHS STATION MN-PK-2 ERKSINE MN 7.6 SSW. 0735 AM HEAVY RAIN 7 ENE BRANTFORD 47.65N 98.80W 08/10/2020 M1.55 INCH EDDY ND MESONET MESONET STATION 7680D 6 N GRACE CITY. 0735 AM HEAVY RAIN 7 NNW BERNER 47.89N 95.54W 08/10/2020 M1.54 INCH CLEARWATER MN MESONET MESONET STATION 9603D 6 NW BERNER. 0853 AM HEAVY RAIN 6 WNW GRAND FORKS 47.95N 97.18W 08/10/2020 M1.53 INCH GRAND FORKS ND ASOS ASOS STATION KGFK GRAND FORKS AP ND. 0835 AM HEAVY RAIN 7 ENE BRANTFORD 47.65N 98.80W 08/10/2020 M1.53 INCH EDDY ND MESONET MESONET STATION 7680D 6 N GRACE CITY. 0738 AM HEAVY RAIN 2 SSW MENTOR 47.67N 96.17W 08/10/2020 M1.47 INCH POLK MN MESONET MESONET STATION FW1506 MENTOR MN 2 SW. 0800 AM HEAVY RAIN 4 N GRAND FORKS 47.97N 97.07W 08/10/2020 M1.45 INCH GRAND FORKS ND COCORAHS COCORAHS STATION ND-GF-22 GRAND FORKS ND 3.9 N. 0735 AM HEAVY RAIN 2 NW NEWFOLDEN 48.38N 96.36W 08/10/2020 M1.43 INCH MARSHALL MN MESONET MESONET STATION 3844D 2 NW NEWFOLDEN. 0500 AM HEAVY RAIN 3 SSE ADA 47.26N 96.50W 08/10/2020 M1.35 INCH NORMAN MN MESONET MESONET STATION ADSM5 ADA MN 2 S. 0735 AM HEAVY RAIN 2 WNW PENCER 48.72N 95.68W 08/10/2020 M1.34 INCH ROSEAU MN MESONET MESONET STATION 3436D 2 WNW PENCER. 0700 AM HEAVY RAIN 2 SSW MENTOR 47.67N 96.17W 08/10/2020 M1.32 INCH POLK MN COCORAHS COCORAHS STATION MN-PK-15 MENTOR MN 2.5 SSW. 0735 AM HEAVY RAIN 2 WNW THIEF RIVER FALLS 48.12N 96.22W 08/10/2020 M1.30 INCH PENNINGTON MN MESONET MESONET STATION 3616D 2 W THIEF RIVER FALLS. 0700 AM HEAVY RAIN 5 S MAVIE 48.07N 95.92W 08/10/2020 M1.26 INCH PENNINGTON MN COCORAHS COCORAHS STATION MN-PG-3 GOODRIDGE MN 7.4 SW. 0700 AM HEAVY RAIN 5 SSW CASSELTON 46.83N 97.26W 08/10/2020 M1.24 INCH CASS ND COCORAHS COCORAHS STATION ND-CS-32 DURBIN ND 5.4 WNW. 0853 AM HEAVY RAIN 3 NNW MARCH 48.24N 96.92W 08/10/2020 M1.20 INCH MARSHALL MN MESONET MESONET STATION FW5320 ARGYLE MN 8 SW. 0730 AM HEAVY RAIN HIGH LANDING 48.05N 95.81W 08/10/2020 M1.20 INCH PENNINGTON MN MESONET MESONET STATION HIGM5 HIGHLANDING MN. 0700 AM HEAVY RAIN 2 SE GRAND FORKS 47.89N 97.03W 08/10/2020 M1.12 INCH GRAND FORKS ND COCORAHS COCORAHS STATION ND-GF-8 GRAND FORKS ND 2.5 SE. 0740 AM HEAVY RAIN 1 W BAGLEY 47.52N 95.43W 08/10/2020 M1.11 INCH CLEARWATER MN MESONET MESONET STATION GHG06 BAGLEY MN. 0700 AM HEAVY RAIN CASSELTON 46.90N 97.20W 08/10/2020 M1.10 INCH CASS ND COCORAHS COCORAHS STATION ND-CS-41 CASSELTON ND 0.4 ENE. 0735 AM HEAVY RAIN 1 WSW DAKOTA JUNCTION 48.15N 96.22W 08/10/2020 M1.08 INCH PENNINGTON MN MESONET MESONET STATION 6945D 1 WSW DAKOTA JUNCTION. 0706 AM HEAVY RAIN 3 SSW BAUDETTE 48.67N 94.62W 08/10/2020 M1.06 INCH LAKE OF THE WOODS MN MESONET MESONET STATION BTTM5 BAUDETTE MN 3 S. 0830 AM HEAVY RAIN 2 WNW THIEF RIVER FALLS 48.12N 96.22W 08/10/2020 M1.05 INCH PENNINGTON MN MESONET MESONET STATION 3616D 2 W THIEF RIVER FALLS. 0700 AM HEAVY RAIN 10 S MOORETON 46.12N 96.88W 08/10/2020 M1.04 INCH RICHLAND ND PUBLIC VIA SOCIAL MEDIA. 0735 AM HEAVY RAIN 6 NNE ALVARADO 48.27N 96.96W 08/10/2020 M1.00 INCH MARSHALL MN MESONET MESONET STATION 9440D 5 NNE ALVARADO.
Environment
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Surface Analysis - 10 am |
Surface Analysis - 1 pm |
Surface Analysis - 4 pm |
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850 mb Analysis - 1 pm |
700 mb Analysis - 1 pm |
500 mb Analysis - 1 pm |
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ML CAPE/CIN - 1 pm |
Effective Bulk Shear - 1 pm |
Precipitable Water - 1 pm |
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