Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 229, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 16, 2002, 10:29 PM CDT for Clay County, Minnesota. It was in force for 46 min. 1 report 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 16, 2002, 10:29 PM CDT (03:29 UTC)
- Expired
- Aug 16, 2002, 11:15 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
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 16, 10:45 PM CDT | Thunderstorm Wind | Moorhead, MN | Trees were blown down, some fell across roads. |
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 16, 6:25 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 16, 10:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 3.5 hours before the alert went out and 266 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
- 134 J/kg
- Mixed-layer CIN
- -501 J/kg
- Mixed-layer LCL
- 802 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 272 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
072 WUUS53 KFGF 170329 SVRFAR MNC027-170415- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 1029 PM CDT FRI AUG 16 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CLAY COUNTY IN NORTHWEST MINNESOTA. * UNTIL 1115 PM CDT. * AT 1024 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE LEADING EDGE OF SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 21 MILES NORTH OF FARGO TO 17 MILES SOUTH OF FARGO...MOVEMENT WAS TO THE EAST AT 50 MPH. * SEVERE THUNDERSTORMS WILL BE NEAR... GLYNDON AT 1030 PM... DOWNER AT 1035 PM AND MUSKODA AT 1040 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM SATURDAY MORNING FOR NORTHWESTERN MINNESOTA AND SOUTHEAST NORTH DAKOTA. LAT...LON 4713 9680 4666 9672 4667 9628 4711 9636 7 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 16, 8:45 PM CDT, 1 hour 44 minutes earlier.
Area forecast discussion, Aug 16, 8:45 PM CDT, 1 hour 44 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 845 PM CDT FRI AUG 16 2002 TWO CHALLENGES REMAIN FOR THIS EVENING...FIRST IS CONVECTION AND THE SECOND IS WIND. SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR SOUTHWEST PORTIONS OF THE FA UNTIL MIDNIGHT. AT THIS TIME IT APPEARS THE BEST THREAT MAY BE SHIFTING FURTHER SOUTH...WITH MORE WIDESPREAD SHOWER/WEAKER TSTORM ACTIVITY FOR THIS AREA. STILL SOME BOUNDARIES APPARENT ON THE KMVX 88D THAT MAY INTERSECT AND PROVIDE SOME SEVERE WEATHER. WILL CONTINUE TO MONITOR BUT EXPECT LITTLE CHANGE TO THUNDER WORDING IN ZONES. HIGH WIND WATCH ALSO LEFT OVER FROM DAY SHIFT. APPEARS THAT BEST SFC PRESSURE GRADIENT IS OVER SOUTHWEST ND. SEEING QUITE A FEW GUSTS IN THAT AREA OVER 50 KNOTS. 12Z/18Z MODEL RUNS NOT HANDLING THE SFC LOW TRACK VERY WELL. MSAS 3 HOUR PRESSURE FALLS STILL BEST EAST OF THE LOW (NOT NORTHEAST). THIS FURTHER SOUTHWARD TRACK WOULD FAVOR A FURTHER SOUTHWARD PUSH OF THE STRONGEST WINDS. THE EARLIER MODEL RUNS ALSO SHOW BEST PUSH OF COLD ADVECTION OVER THE FA FROM 06Z-12Z WHICH CORRESPONDS TO THE COLD FRONTAL PASSAGE. AVN LOOKS TO BE DOING A SLIGHTLY BETTER JOB SHOWING THE BEST 850 MB WIND SURGE FROM WESTERN ND AND SOUTHEAST UNTIL 06Z...THEN THE AVN IS WEAKER ON 850 MB WIND SPEEDS AFTER 12Z THAN THE ETA. WILL THEREFORE GO WITH A WIND ADVISORY FOR THE ENTIRE FA FOR LATE TONIGHT INTO SATURDAY. .FGF...WIND ADVISORY FOR LATE TONIGHT AND SATURDAY ENTIRE FA. GODON
In the hours before
Local storm report, Aug 16, 9:57 PM CDT, 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
957 PM CDT FRI AUG 16 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0905 PM 5 E GRANDIN ND .75 INCH HAIL
08/16/02 CASS
0930 PM 9 NE ADA MN 1.75 INCH HAIL
08/16/02 NORMAN
PVBLocal storm report, Aug 16, 10:08 PM CDT, 21 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
1008 PM CDT FRI AUG 16 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0940 PM 4 E KATHRYN ND .75 INCH HAIL
08/16/02 BARNES
PVBThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 16, 9:01 PM CDT | Severe Thunderstorm Warning | FGF | Norman | 29 min |
| Aug 16, 9:10 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 50 min |
| Aug 16, 9:29 PM CDT | Severe Thunderstorm Warning | FGF | Mahnomen, Norman | 46 min |
| Aug 16, 9:46 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail | 44 min |
| Aug 16, 10:34 PM CDT | Severe Thunderstorm Warning | FGF | Wilkin | 41 min |
| Aug 16, 10:49 PM CDT | Severe Thunderstorm Warning | FGF | Becker | 41 min |
| Aug 16, 10:53 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail | 52 min |
| Aug 16, 11:25 PM CDT | Severe Thunderstorm Warning | FGF | Hubbard | 50 min |
| Aug 16, 11:30 PM CDT | Severe Thunderstorm Warning | FGF | Becker | 30 min |
| Aug 16, 11:55 PM CDT | Tornado Warning | FGF | Otter Tail | 50 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.