Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 305, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 28, 2002, 8:05 PM CDT for Otter Tail County, Minnesota. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 28, 2002, 8:05 PM CDT (01:05 UTC)
- Expired
- Aug 28, 2002, 8:45 PM CDT
- In force
- 40 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Otter Tail County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 165 km from the middle of the area, began a volume at 01:06 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 28, 5:35 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 1.1 hours before the alert went out and 251 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1255 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 1187 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
485 WUUS53 KFGF 290105 SVRFAR MNC111-290145- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 805 PM CDT WED AUG 28 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN OTTER TAIL COUNTY IN WEST CENTRAL MINNESOTA. * UNTIL 845 PM CDT. * AT 800 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 3 MILES EAST OF VERGAS...OR ABOUT 12 MILES SOUTH OF DETROIT LAKES...MOVEMENT WAS TO THE EAST AT 30 MPH. THIS STORM IS TAKING ON A BOW SHAPED APPERANCE AND MAY BE PRODUCING VERY STRONG WINDS IN EXCESS OF 60 MPH AS IT MOVES THROUGH NORTHERN OTTER TAIL COUNTY. * THE SEVERE THUNDERSTORM WILL BE NEAR... PERHAM AT 820 PM... BUTLER AT 830 PM AND HILLVIEW AT 840 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM WEDNESDAY EVENING FOR NORTHWESTERN MINNESOTA AND SOUTHEAST NORTH DAKOTA. LAT...LON 4669 9587 4656 9584 4647 9520 4670 9522 DTR NNNN
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 28, 7:50 PM CDT, 15 minutes earlier.
Area forecast discussion, Aug 28, 7:50 PM CDT, 15 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 750 PM CDT WED AUG 28 2002 .CURRENT OBSERVATIONAL OVERVIEW... 00Z MSAS ANALYSIS DEPICTED WEAK LOW PRESSURE OVER EXTREME NORTH CENTRAL SOUTH DAKOTA WITH ASSOCIATED INVERTED TROUGH AXIS FROM SOUTHEAST NORTH DAKOTA INTO WESTERN MINNESOTA. LATEST SATELLITE AND KMVX RADAR INDICATED STRONG/SEVERE THUNDERSTORMS FIRING ALONG AND AHEAD OF TROUGH AXIS IN VICINITY OF STRONG INSTABILITY AND ENHANCED MOISTURE FLUX CONVERGENCE. .FORECAST DETAILS... EXPECT STORMS TO SLOWLY WEAKEN IN TERM OF SEVERITY DURING NEXT COUPLE OF HOURS AS DAYTIME HEATING CEASES. HOWEVER...EXPECT FLOODING POTENTIAL TO PERSIST AS MULTICELLUAR STORMS MERGE MORE INTO MCS SITUATION REMAINDER OF NIGHT. WILL MONITOR RADAR TRENDS DURING NEXT FEW HOURS TO DETERMINE WHERE BEST LINGERING HEAVY THREAT EXISTS OVERNIGHT...AND THUS PERHAPS BE ABLE HOPE TO FINE TUNE INHERITED FLOOD WATCH. .FGF...FLOOD WATCH ALL OF FA EXCEPT DVL REGION AND EXTREME NE ND AND NW MN. BERG
In the hours before
Local storm report, Aug 28, 6:16 PM CDT, 1 hour 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
616 PM CDT WED AUG 28 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0545 PM 4 SE HITTERDAL MN .75 INCH HAIL
08/28/02 CLAY REPORTED BY PUBLIC.
DPORTERLocal storm report, Aug 28, 6:33 PM CDT, 1 hour 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
633 PM CDT WED AUG 28 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0530 PM 9 NW PELICAN RAPIDS MN 1.00 INCH HAIL
08/28/02 OTTER TAIL REPORTED BY PUBLIC.
0600 PM 3 E WAUBUN MN .88 INCH HAIL
08/28/02 MAHNOMEN REPORTED BY CO-OP OBSERVER.
DPORTERLocal storm report, Aug 28, 6:42 PM CDT, 1 hour 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
642 PM CDT WED AUG 28 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0635 PM SABIN MN .75 INCH HAIL
08/28/02 CLAY REPORTED BY CO-OP
OBSERVER.
DPORTERLocal storm report, Aug 28, 6:59 PM CDT, 1 hour 6 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
659 PM CDT WED AUG 28 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0530 PM 2 N OGEMA MN 1.75 INCH HAIL
08/28/02 BECKER REPORTED BY PUBLIC.
0635 PM SABIN MN .75 INCH HAIL
08/28/02 CLAY
DPORTERLocal storm report, Aug 28, 7:17 PM CDT, 48 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
717 PM CDT WED AUG 28 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0705 PM 2 NE AYR ND 1.00 INCH HAIL
08/28/02 CASS REPORTED BY PUBLIC.
0715 PM AYR ND 1.00 INCH HAIL
08/28/02 CASS
DPORTERLocal storm report, Aug 28, 7:40 PM CDT, 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
740 PM CDT WED AUG 28 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0725 PM 7 NW VERGAS MN .75 INCH HAIL
08/28/02 OTTER TAIL REPORTED BY PUBLIC.
DPORTERThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 7:09 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Otter Tail | 51 min |
| Aug 28, 7:58 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Hubbard | 47 min |
| Aug 28, 8:46 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail, Wadena | 44 min |
| Aug 28, 10:19 PM CDT | Severe Thunderstorm Warning | FGF | Grant | 41 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 2002Every severe thunderstorm warning in 2002
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.