National Weather Service United States Department of Commerce

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
ef-scale

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

Photo Photo Photo
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.

 

Photo Photo Photo
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

Environment Environment Environment

Surface Analysis - 10 am

Surface Analysis - 1 pm

Surface Analysis - 4 pm

Environment Environment Environment

850 mb Analysis - 1 pm

700 mb Analysis - 1 pm

500 mb Analysis - 1 pm

Environment Environment Environment

ML CAPE/CIN - 1 pm

Effective Bulk Shear - 1 pm

Precipitable Water - 1 pm

nws logo Media use of NWS Web News Stories is encouraged!
Please acknowledge the NWS as the source of any news information accessed from this site.
nws logo