Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 151, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2002, 6:46 PM CDT for Benson County, North Dakota. It was in force for 44 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
- Jul 31, 2002, 6:46 PM CDT (23:46 UTC)
- Expired
- Jul 31, 2002, 7:30 PM CDT
- In force
- 44 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Benson County, ND
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 31, 7:20 PM CDT | Hail 1 | Maddock, ND | The ground was white with hail. |
| Jul 31, 7:35 PM CDT | Hail 1 | Maddock, 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 31, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.8 hours before the alert went out and 154 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
- 307 J/kg
- Mixed-layer CIN
- -525 J/kg
- Mixed-layer LCL
- 1640 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 161 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
344 WUUS53 KFGF 312346 SVRFAR NDC005-010030- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 645 PM CDT WED JUL 31 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN BENSON COUNTY IN NORTHEAST NORTH DAKOTA. * UNTIL 730 PM CDT. * AT 639 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 11 MILES SOUTHWEST OF ESMOND...OR ABOUT 50 MILES WEST OF DEVILS LAKE...MOVEMENT WAS TO THE EAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... MADDOCK AT 700 PM... FLORA AT 705 PM AND OBERON AT 715 PM. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 100 AM THURSDAY MORNING FOR NORTHWESTERN MINNESOTA AND EASTERN NORTH DAKOTA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 900 PM WEDNESDAY EVENING FOR NORTHEAST NORTH DAKOTA. LAT...LON 4801 9996 4783 9996 4787 9922 4808 9920 30/54 NNNN
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 3:36 AM CDT | Severe Thunderstorm Warning | FGF | Sargent | 39 min |
| Jul 31, 4:13 AM CDT | Severe Thunderstorm Warning | FGF | Richland, Sargent | 47 min |
| Jul 31, 4:59 AM CDT | Severe Thunderstorm Warning | FGF | Richland | 31 min |
| Jul 31, 6:13 PM CDT | Tornado Warning | FGF | Benson | 32 min |
| Jul 31, 6:18 PM CDT | Tornado Warning | FGF | Ramsey | 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.