Alert archive / Minnesota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 204, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 11, 2002, 7:12 PM CDT for Clay County, Norman County, Minnesota. It was in force for 48 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, 7:12 PM CDT (00:12 UTC)
- Expired
- Aug 11, 2002, 8:00 PM CDT
- In force
- 48 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
Counties Clay County, MN, Norman County, MN
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 11, 7:35 PM CDT | Thunderstorm Wind 70 E | Glyndon, MN |
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, 6:45 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 0.2 hours before the alert went out and 287 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.
008 WUUS53 KFGF 120012 SVRFAR MNC027-107-120100- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 711 PM CDT SUN AUG 11 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CLAY COUNTY IN NORTHWEST MINNESOTA AND NORMAN COUNTY IN NORTHWEST MINNESOTA. * UNTIL 800 PM CDT. * AT 705 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE LEADING EDGE OF SEVERE THUNDERSTORMS ALONG A LINE EXTENDING FROM 32 MILES SOUTH OF GRAND FORKS TO 12 MILES SOUTH OF FARGO...MOVEMENT WAS TO THE EAST AT 45 MPH. * SEVERE THUNDERSTORMS WILL BE NEAR... MOORHEAD AT 715 PM... SABIN AT 720 PM... ADA AT 725 PM AND HITTERDAL AT 745 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. LAT...LON 4745 9681 4666 9673 4672 9624 4746 9624 DTR 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, 3:15 PM CDT, 3 hours 57 minutes earlier.
Area forecast discussion, Aug 11, 3:15 PM CDT, 3 hours 57 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, 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 11, 11:15 PM CDT | Severe Thunderstorm Warning | FGF | Grant | 45 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.