Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 203, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 11, 2002, 6:29 PM CDT for Cass County, Traill County, North Dakota. It was in force for 56 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 11, 2002, 6:29 PM CDT (23:29 UTC)
- Expired
- Aug 11, 2002, 7:25 PM CDT
- In force
- 56 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
Counties Cass County, ND, Traill County, ND
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 11, 7:10 PM CDT | Thunderstorm Wind 52 E | Argusville, 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 11, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.5 hours before the alert went out and 263 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
- 194 J/kg
- Mixed-layer CIN
- -368 J/kg
- Mixed-layer LCL
- 1960 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 423 m²/s²
- 0-3 km storm-relative helicity
- 466 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
612
WUUS53 KFGF 112329
SVRFAR
NDC017-097-120025-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS
625 PM CDT SUN AUG 11 2002
THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN CASS COUNTY IN SOUTHEAST NORTH DAKOTA AND
TRAILL COUNTY IN SOUTHEAST NORTH DAKOTA.
* UNTIL 725 PM CDT.
* AT 619 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
LEADING EDGE OF SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 43
MILES NORTH OF VALLEY CITY TO 20 MILES EAST OF VALLEY CITY...
MOVEMENT WAS TO THE EAST AT 50 MPH. WINDS IN EXCESS OF 70 MPH
WILL BE LIKELY...ESPECIALLY IN TRAIL COUNTY.
* SEVERE THUNDERSTORMS WILL BE NEAR...
PAGE AT 630 PM...
GALESBURG AT 640 PM...
CLIFFORD AT 640 PM...
MAYVILLE AT 655 PM AND
HILLSBORO AT 710 PM.
REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM SUNDAY
EVENING FOR NORTHWEST MINNESOTA AND EASTERN NORTH DAKOTA.
LAT...LON 4757 9732 4719 9745 4720 9764 4679 9758
4690 9685 4765 9702
06
NNNNWhat 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, 3:15 PM CDT, 3 hours 14 minutes earlier.
Area forecast discussion, Aug 11, 3:15 PM CDT, 3 hours 14 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 315 PM CDT SUN AUG 11 2002 ...FCST CHALLENGE IS SEVERE WEATHER THREAT THROUGH THIS EVENING... ANALYSIS/NEAR TERM...DISCUSSION IS ABBREVIATED DUE TO SEVERE WEATHER THREAT. SUPERCELL TSTMS DEVELOPING QUICKLY AHEAD OF A DEEPENING LOW PRESSURE SYSTEM IN SCNTRL ND...IN AREA OF LOW LVL MOISTURE CONVERGENCE. STRENGTHENING 500MB (50KT PLUS) JET STREAK NOW ROUNDING THE BASE OF THE 500MB TROF IN SOUTHWEST MT WILL PROVIDE INCREASING DYNAMIC SUPPORT FOR STRONG TSTM DEVELOPMENT AND ORGANIZATION THROUGH THE LATE AFTERNOON AND EVENING HOURS. SWOMCD PROJECTS POSSIBLE SQUALL LINE DEVELOPMENT...LATE AFTERNOON IN ERN ND THEN EARLY EVENING INTO WRN MN. SEVERE WATCH IN EFFECT ACROSS ERN ND ATTM. WILL POSSIBLY NEED ADDN WATCH INTO WRN MN BY EARLY EVENING AS LINE DEVELOPS. MONDAY AND TUESDAY...COLD POOL ALOFT SHIFTS ACROSS THE NRN PLAINS ON MONDAY WITH SHOWERS EXPECTED TO REDEVLOP BY MID AFTERNOON. UPPER LVL TROUGH THEN ANCHORS OVR THE NRN PLAINS THROUGH THE MIDWEEK PERIOD KEEPING AREA UNDER SEASONABLY COOLER FLOW NEXT WEAK IMPULSE INTO THE AREA LATE AFTERNOON TUESDAY. SOME DRYING POSSIBLE BY LATE WEK PERIOD THOUGH TEMPS REMAIN BELOW SEASONAL NORMALS. .FGF...SEVERE THUNDERSTORM WATCH FOR EASTERN ND THIS EVENING. GUST
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 4:54 PM CDT | Severe Thunderstorm Warning | FGF | Eddy | 51 min |
| Aug 11, 5:08 PM CDT | Severe Thunderstorm Warning | FGF | Benson, Nelson, Ramsey | 37 min |
| Aug 11, 5:44 PM CDT | Severe Thunderstorm Warning | FGF | Barnes | 61 min |
| Aug 11, 5:47 PM CDT | Severe Thunderstorm Warning | FGF | Nelson, Ramsey, Walsh | 43 min |
| Aug 11, 5:54 PM CDT | Severe Thunderstorm Warning | FGF | Griggs, Steele | 51 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.