Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 294, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 28, 2002, 4:44 PM CDT for Clay County, Minnesota. It was in force for 46 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, 4:44 PM CDT (21:44 UTC)
- Expired
- Aug 28, 2002, 5:30 PM CDT
- In force
- 46 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Clay County, MN
The radar
The Fargo/Grand Forks radar (KMVX), 85 km from the middle of the area, began a volume at 21:48 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 nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 9.7 hours before the alert went out and 270 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
- 1363 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 969 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
738 WUUS53 KFGF 282144 SVRFAR MNC027-282230- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 444 PM CDT WED AUG 28 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN CLAY COUNTY IN NORTHWEST MINNESOTA. * UNTIL 530 PM CDT. * AT 443 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER AVERILL...OR ABOUT 14 MILES NORTHEAST OF FARGO...MOVEMENT WAS TO THE NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... FELTON AT 500 PM AND HITTERDAL AT 505 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4700 9675 4673 9669 4694 9621 4714 9642 08 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, 3:00 PM CDT, 1 hour 44 minutes earlier.
Area forecast discussion, Aug 28, 3:00 PM CDT, 1 hour 44 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 300 PM CDT WED AUG 28 2002 FORECAST CHALLENGE IS PRECIPITATION. LATEST SATELLITE IMAGERY SHOWS CLOUDS COVER MAINLY OVER N PARTS OF AREA...WITH SCATTERED CLOUD COVER ELSEWHERE. KMVX HAS CONVECTION IN FAR E COUNTIES. CURRENT MSAS SURFACE ANALYSIS HAS LOW CENTERED MOBRIDGE AND ABR...WITH INVERTED TROF EXTENDING THROUGH AREA ALONG A JMS-GFK-HCO LINE. WHEN COMPARING ATMOSPHERIC CONDITIONS TO MODEL INITIALIZATIONS...AVN CLOSEST. SURFACE LOW AND INVERTED TROF MOVE BARELY E OVERNIGHT (TO ALONG A FAR-BDE LINE BY 12Z THU)...KEEPING THETA-E RIDGE...GOOD INSTABILITY...MID LEVEL LIFT...SURFACE MOISTURE CONVERGENCE...OVER MUCH OF AREA THROUGH THE NIGHT. MODEL SOUNDINGS INDICATE PRECIPITABLE WATERS FROM 1.25 TO 1.75 INCHES...WITH WEAK FLOW THROUGH MUCH OF THE COLUMN AND THICKNESS DIFFLUENCE OVER THE AREA...HEAVY RAIN WITH TRAINING STORMS POSSIBLE AGAIN TONIGHT. WITH CAPES STILL 2000-3000 OVER AREA AND NO CAP...ALREADY HAVE HAD SEVERE HAIL...SO WILL KEEP MENTION OF SEVERE POTENTIAL FOR E COUNTIES. AS A RESULT...ISSUED FLOOD WATCH FOR ALL OF AREA EXCEPT DVL PORTION AND EXTREME NE ND AND NW MN THROUGH TONIGHT. THANKS TO BIS (FGF BACKING UP)...MSP AND DLH FOR COORD. SFC LOW WASHES OUT OVER AREA ON THU...AS 700MB AND 500MB TROFS ALONG WITH UPPER LEVEL SHORTWAVE MOVE THROUGH. WITH PLENTY OF LOW TO MID LEVEL MOISTURE REMAINING AND INVERTED TROF STILL IN AREA... ADDITIONAL THUNDERSTORMS ARE EXPECTED. TROFS AND SHORTWAVE LIFT THROUGH E PART OF AREA ON THU NIGHT...SO KEPT CHC OF STORMS. BY 12Z FRI...NEXT SURFACE FRONT MOVES INTO CENTRAL ND AND SD...BRINGING A CHANCE OF STORMS TO DVL ON FRI AND THE REST OF AREA BY FRI NIGHT. THIS FRONT MOVES SLOWLY THROUGH AREA...KEEPING CHANCE OF THUNDERSTORMS FOR THE REGION THROUGH SAT AND INTO SAT NIGHT. EXTENDED...MAJORITY OF EXTENDED MODELS (CANADIAN/ECMWF/AVN) TRENDING TOWARDS LESS AMPLIFICATION/MORE ZONAL FLOW INTO FIRST HALF OF NEXT WEEK. INITIALLY TIMING IS MAIN CONCERN HOWEVER WILL NEED TO CONTINUE WITH PCPN CHANCES. LOOKS TO BE A BRIEF BREAK TUESDAY BEFORE SW FLOW ALOFT KICKS IN AGAIN WITH SFC LOW PRESSURE MOVING IN MID WEEK. COOLEST DAY LOOKS TO BE EARLY (SUN) WITH PASSAGE OF COLD FRONT FOLLOWED BY NEAR OR BLO SEASONAL VALUES UNTIL RECOVERY MIDWEEK. .FGF...FLOOD WATCH ALL OF FA EXCEPT DVL REGION AND EXTREME NE ND AND NW MN. NG/VOELKER
In the hours before
Local storm report, Aug 28, 2:12 PM CDT, 2 hours 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
212 PM CDT WED AUG 28 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0200 PM 1 NW BAD MEDICINE LAKE MN .88 INCH HAIL
08/28/02 BECKER REPORTED BY PUBLIC.
0200 PM 1 S LONG LOST LAKE MN .88 INCH HAIL
08/28/02 CLEARWATER REPORTED BY PUBLIC.Local storm report, Aug 28, 4:36 PM CDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
436 PM CDT WED AUG 28 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0433 PM WAHPETON ND 1.00 INCH HAIL
08/28/02 RICHLAND REPORTED BY TRAINED
SPOTTER.
DPORTERThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 7:47 PM CDT | Severe Thunderstorm Warning | FGF | Marshall | 58 min |
| Aug 27, 11:18 PM CDT | Flash Flood Warning | FGF | Marshall | 6 hr |
| Aug 28, 1:15 PM CDT | Severe Thunderstorm Warning | FGF | Clearwater | 45 min |
| Aug 28, 1:44 PM CDT | Severe Thunderstorm Warning | FGF | Becker | 46 min |
| Aug 28, 2:00 PM CDT | Severe Thunderstorm Warning | FGF | Clearwater, Hubbard | 45 min |
| Aug 28, 4:30 PM CDT | Severe Thunderstorm Warning | FGF | Wilkin | 45 min |
| Aug 28, 5:01 PM CDT | Tornado Warning | FGF | Wilkin | 44 min |
| Aug 28, 5:09 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Mahnomen | 51 min |
| Aug 28, 5:27 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail | 48 min |
| Aug 28, 5:29 PM CDT | Severe Thunderstorm Warning | FGF | Clay | 46 min |
| Aug 28, 5:47 PM CDT | Tornado Warning | FGF | Wilkin | 43 min |
| Aug 28, 6:00 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Mahnomen | 60 min |
| Aug 28, 6:14 PM CDT | Flash Flood Warning | FGF | Wilkin | 6 hr |
| Aug 28, 6:16 PM CDT | Flash Flood Warning | FGF | Wilkin | 6 hr |
| Aug 28, 6:16 PM CDT | Severe Thunderstorm Warning | FGF | Clay | 59 min |
| Aug 28, 6:57 PM CDT | Flash Flood Warning | FGF | Becker, Clay, Mahnomen | 6 hr |
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.