Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 209, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 11, 2002, 11:15 PM CDT for Grant County, Minnesota. It was in force for 45 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 11, 2002, 11:15 PM CDT (04:15 UTC)
- Expired
- Aug 12, 2002, 12:00 AM CDT
- In force
- 45 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Grant County, MN
The radar
The Aberdeen radar (KABR), 184 km from the middle of the area, began a volume at 04:18 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 11, 11:30 PM CDT | Hail 1 | Donnelly, MN | |
| Aug 11, 11:30 PM CDT | Thunderstorm Wind 52 E | Donnelly, MN | About 25 trees downed. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
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 11, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 4.3 hours before the alert went out and 206 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
- 2317 J/kg
- Mixed-layer CIN
- -146 J/kg
- Mixed-layer LCL
- 2063 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
715 WUUS53 KFGF 120415 SVRFAR MNC051-120500- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 1115 PM CDT SUN AUG 11 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN GRANT COUNTY IN WEST CENTRAL MINNESOTA. * UNTIL MIDNIGHT CDT. * AT 1110 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTH OF HERMAN...OR ABOUT 38 MILES SOUTH OF FERGUS FALLS...MOVEMENT WAS TO THE NORTHEAST AT 45 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... BARRETT AT 1130 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT MONDAY MORNING FOR NORTHWESTERN MINNESOTA AND SOUTHEAST NORTH DAKOTA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT MONDAY MORNING FOR WEST CENTRAL MINNESOTA AND SOUTHEAST NORTH DAKOTA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 700 PM SUNDAY EVENING FOR NORTHWEST MINNESOTA AND EASTERN NORTH DAKOTA. LAT...LON 4575 9628 4562 9609 4588 9579 4595 9601 30 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 11, 8:15 PM CDT, 3 hours earlier.
Area forecast discussion, Aug 11, 8:15 PM CDT, 3 hours before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 815 PM CDT SUN AUG 11 2002 ...SEVERE WEATHER THREAT CONTINUES ALG THE RRV AND INTO WRN MN... ANALYSIS/NEAR TERM...DISCUSSION IS ABBREVIATED DUE TO ONGOING SEVERE WEATHER. SUPERCELL TSTMS CONTINUE TO DEVELOP ALG A LINE FRM EXTREEM NWRN MN INTO EXTREME SERN ND...AND SOUTHWARD INTO ERN SD. THE PREFRONTAL LINE IS BEGINNING TO BOW FROM NERN NORMAN COUNTY TOWARDS SRN BELTRAMI COUNTY IN NORTHWEST MN ATTM. WATCH BOX WAS EXTENDED ACROSS MUCH OF NWRN MN THROUGH MIDNIGHT. ADDITIONAL SHOWER/TSTM DEVELOPMENT IS STILL POSSIBLE LATER THIS EVENING IN ERN ND AS UPR LVL DYNAMICS INCREASE. HOWEVER MUCH OF THIS WILL LIKELY DEVELOP INTO WIDESPREAD RAIN AND PROGRESS ACROSS THE RRV INTO NWRN MN OVERNIGHT. .FGF...SEVERE THUNDERSTORM WATCH FOR RRV AND NWRN AND WCNTRL MN THROUGH MIDNIGHT. GUST
In the hours before
Local storm report, Aug 11, 7:47 PM CDT, 3 hours 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
747 PM CDT SUN AUG 11 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0510 PM 5 S WARWICK ND 1.00 INCH HAIL
08/11/02 BENSON
0515 PM WARWICK ND 1.75 INCH HAIL
08/11/02 BENSON
0530 PM 3 S DOYON ND .75 INCH HAIL
08/11/02 RAMSEY
0535 AM 14 E DEVILS LAKE ND .75 INCH HAIL
08/11/02 RAMSEY
0605 PM 1/2 NE LAWTON ND 1.25 INCH HAIL
08/11/02 RAMSEY MIXED DIME TO HALF DOLLAR
HAIL FELL FOR 10 MIN
0555 PM 7 WSW HANNAFORD ND 60 MPH WIND GUST
08/11/02 GRIGGS WINDS OCCURRED FROM 555 PM
TO 610 PM
0610 PM 6 SW FAIRDALE ND 1.00 INCH HAIL
08/11/02 WALSH
0705 PM DAVENPORT ND 65 MPH WIND GUST
08/11/02 CASS
0710 PM ARGUSVILLE ND 60 MPH WIND GUST
08/11/02 CASS REPORTED BY STATE PATROL
0715 AM HENDRUM MN 60 MPH WIND GUST
08/11/02 NORMAN
0735 PM GLYNDON MN 80 MPH WIND GUST
08/11/02 CLAY
KENNEDYLocal storm report, Aug 11, 9:07 PM CDT, 2 hours 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
907 PM CDT SUN AUG 11 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0845 PM 1 S BAGLEY MN TORNADO
08/11/02 CLEARWATER BRIEF TOUCHDOWN IN OPEN
PASTURE
KENNEDYLocal storm report, Aug 11, 9:45 PM CDT, 1 hour 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
945 PM CDT SUN AUG 11 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0555 PM 6 SW LAKOTA ND 1.25 INCH HAIL
08/11/02 NELSON
0510 PM 5 SW HAMAR ND 1.00 INCH HAIL
08/11/02 EDDY
KENNEDYThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 7:12 PM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman | 48 min |
| Aug 11, 7:51 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Clearwater, Mahnomen | 54 min |
| Aug 11, 7:56 PM CDT | Tornado Warning | FGF | Mahnomen, Norman | 49 min |
| Aug 11, 8:37 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 23 min |
| Aug 11, 8:46 PM CDT | Severe Thunderstorm Warning | FGF | Becker, Beltrami, Clearwater, Hubbard | 59 min |
| Aug 11, 8:53 PM CDT | Tornado Warning | FGF | Beltrami, Clearwater, Hubbard | 52 min |
| Aug 11, 9:37 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail, Wadena | 38 min |
| Aug 12, 12:19 AM CDT | Severe Thunderstorm Warning | FGF | Otter Tail | 56 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.