Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 279, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 27, 2002, 5:58 PM CDT for Cavalier County, Pembina County, North Dakota. It was in force for 47 min. 5 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 27, 2002, 5:58 PM CDT (22:58 UTC)
- Expired
- Aug 27, 2002, 6:45 PM CDT
- In force
- 47 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
Counties Cavalier County, ND, Pembina County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 147 km from the middle of the area, began a volume at 23:00 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 27, 6:05 PM CDT | Hail 1.75 | Vang, ND | The ground was white with hail. |
| Aug 27, 6:15 PM CDT | Hail 1 | Walhalla, ND | The ground was white with hail. |
| Aug 27, 6:34 PM CDT | Hail 0.75 | Cavalier, ND | |
| Aug 27, 6:48 PM CDT | Hail 1 | Cavalier, ND | |
| Aug 27, 6:55 PM CDT | Hail 0.75 | Langdon, ND |
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 27, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.0 hours before the alert went out and 300 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
- 668 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 1358 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
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 27, 3:20 PM CDT, 2 hours 38 minutes earlier.
Area forecast discussion, Aug 27, 3:20 PM CDT, 2 hours 38 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 320 PM CDT TUE AUG 27 2002 UPDATED...COORD WITH SPC AND THINKING IS SVR WATCH BOX WILL BE NEEDED AT LEAST NRN 1/2 CWFA (NE ND AND NW MN) SOON. MANY BOUNDARIES FLOATING AROUND AT 20Z...MAIN ONES FROM NORTH OF LANGDON TO SOUTH OF HALLOCK TO TVF. GETTING SOME TSRA AND TCU FIRE ALONG THIS BOUNDARY AND ONCE THEY BECOME SFC BASED WATCH OUT. WILL ADD CHC SVR TO MOST ZONES THIS EVE. ------------------------------------------------------------------ PERSISTANCE HAS BEATEN MODELS THE PAST FEW DAYS AND SEE LITTLE NEED TO CHANGE ONGOING FCST THROUGH LABOR DAY. DEW PTS ONCE AGAIN IN THE 65-70 RANGE OVER ERN ND AND NW MN...WITH SOME LOWER DEW PTS FOUND IN FAR ERN ZONES AROUND EDGE OF LARGE CANADIAN HIGH NORTH OF LAKE SUPERIOR. VSBL PIX AND SFC OBS SHOWS NUMEROUS WEAK BOUNDARIES. MORE PROMINENT BOUNDARIES EXTEND JUST EAST OF A MOT-DIK LINE (NW WIND BEHIND TO SE WIND AHEAD) AND FROM NEAR FARGO TO SISSESTON TO JUST EAST OF WATERTOWN (EAST WINDS AHD AND SOUTH WIND BEHIND). CU FIELDS SHOW LOTS OF CONVECTIVE ROLLS AS WELL. GOOD HEATING TAKING PLACE...THOUGH NOT AS GREAT AS MONDAY. MSAS SHOWS LI TO -6 AND EXPECT THIS TO LOWER AS HEATING CONTINUES...ONCE AGAIN MAKING IT MORE UNSTABLE THAN ANY MODEL PROG. THE END RESULT SHOULD BE MORE SCT TSRA FIRING MID AFTERNOON INTO THE EVENING WITH SCT SVR CELLS. BASED ON LATE MORNING CONVECTION VILS OF 55-60 WOULD GIVE DIME HAIL. .LONGER TERM... NO CHANGE THRU FRIDAY. CURRENT WK UPR LOW WILL MOVE INTO MANITOBA AND WASH OUT...AS NEW UPR LOW REMAINS OVER INTERMOUNTAIN REGION. AREA TO REMAIN IN SOUTHWEST FLOW ALOFT WITH MOIST 60 DEW PTS REMAINING. DESPITE SOME RISING 50H HEIGHTS...SFC HEATING SHOULD PRODUCE ENOUGH INSTABILITY FOR SCT TSRA IN THE AFTN/EVE EACH PERIOD. KEPT TEMPS ABOUT THE SAME EACH PERIOD...AROUND 80 TO MID 80S EACH DAY. .EXTENDED... MORE ORGANIZED THREAT MAY COME OVER THE WEEKEND INTO LABOR DAY AS NEXT STRONGER SHORT WAVE AND COLD FRONT MOVES THROUGH. .FGF...NONE RIDDLE
In the hours before
Local storm report, Aug 27, 11:59 AM CDT, 5 hours 59 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
1159 AM CDT TUE AUG 27 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0400 PM HUOT MN TORNADO
08/26/02 RED LAKE REPORTED BY PUBLIC.
0500 PM 4 W BROOKS MN TORNADO
08/26/02 RED LAKE REPORTED BY PUBLIC.
0620 PM 3 NE DEVILS LAKE ND .75 INCH HAIL
08/26/02 RAMSEY
DPORTERLocal storm report, Aug 27, 12:00 PM CDT, 5 hours 58 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
1200 PM CDT TUE AUG 27 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0400 PM HUOT MN TORNADO
08/26/02 RED LAKE REPORTED BY PUBLIC.
0500 PM 4 W BROOKS MN TORNADO
08/26/02 RED LAKE REPORTED BY PUBLIC.
0620 PM 3 NE DEVILS LAKE ND .75 INCH HAIL
08/26/02 RAMSEY
DKLocal storm report, Aug 27, 3:04 PM CDT, 2 hours 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
304 PM CDT TUE AUG 27 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0520 PM 5 N MCINTOSH MN TORNADO
08/26/02 POLK REPORTED BY PUBLIC.
0630 PM FLOM MN 2.50 INCH HAIL
08/26/02 NORMAN REPORTED BY PUBLIC.
0720 PM 1 N OGEMA MN .75 INCH HAIL
08/26/02 BECKER REPORTED BY PUBLIC.
0720 PM 1 W WAUBUN MN .75 INCH HAIL
08/26/02 MAHNOMEN REPORTED BY PUBLIC.
0220 AM 4 W LEEDS ND WIND DAMAGE
08/27/02 BENSON CROP DAMAGE. REPORTED BY
PUBLIC.
DPORTERLocal storm report, Aug 27, 5:40 PM CDT, 18 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
540 PM CDT TUE AUG 27 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0515 PM 7 SE MAIDA ND 2.50 INCH HAIL
08/27/02 CAVALIER HAILED 20 MINUTES
UNTIL 525 PM CDT
GROUND WHITEThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 7:14 PM CDT | Severe Thunderstorm Warning | FGF | Lake of the Woods | 46 min |
| Aug 26, 7:38 PM CDT | Tornado Warning | FGF | Clay | 52 min |
| Aug 26, 7:44 PM CDT | Severe Thunderstorm Warning | FGF | Becker | 46 min |
| Aug 26, 7:58 PM CDT | Tornado Warning | FGF | Becker | 47 min |
| Aug 26, 8:24 PM CDT | Severe Thunderstorm Warning | FGF | Otter Tail | 51 min |
| Aug 26, 11:18 PM CDT | Severe Thunderstorm Warning | FGF | Polk | 42 min |
| Aug 26, 7:49 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 41 min |
| Aug 26, 8:08 PM CDT | Flash Flood Warning | FGF | Walsh | 6 hr |
| Aug 27, 12:26 AM CDT | Severe Thunderstorm Warning | FGF | Benson | 49 min |
| Aug 27, 1:33 AM CDT | Severe Thunderstorm Warning | FGF | Ramsey | 42 min |
| Aug 27, 2:07 AM CDT | Severe Thunderstorm Warning | FGF | Benson | 38 min |
| Aug 27, 3:34 AM CDT | Flash Flood Warning | FGF | Benson, Ramsey | 6 hr |
| Aug 27, 10:05 AM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 55 min |
| Aug 27, 5:23 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina | 37 min |
| Aug 27, 6:34 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina | 56 min |
| Aug 27, 6:48 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier, Pembina | 42 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 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.