Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 155, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Jul 31, 2002, 7:40 PM CDT for Walsh County, North Dakota. It was in force for 50 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, 7:40 PM CDT (00:40 UTC)
- Expired
- Jul 31, 2002, 8:30 PM CDT
- In force
- 50 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Walsh County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 106 km from the middle of the area, began a volume at 00:41 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 |
|---|---|---|---|
| Jul 31, 7:57 PM CDT | Thunderstorm Wind 61 E | Lankin, ND | |
| Jul 31, 8:05 PM CDT | Hail 1 | Lankin, 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, 6:25 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 0.7 hours before the alert went out and 278 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
- 1400 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 2219 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 39 m²/s²
- 0-3 km storm-relative helicity
- 144 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
005 WUUS53 KFGF 010040 SVRFAR NDC099-010130- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 740 PM CDT WED JUL 31 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WALSH COUNTY IN NORTHEAST NORTH DAKOTA. * UNTIL 830 PM CDT. * AT 736 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES WEST OF ADAMS...OR ABOUT 27 MILES SOUTH OF LANGDON...MOVEMENT WAS TO THE EAST AT 50 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... LANKIN AT 750 PM... PARK RIVER AT 800 PM... PISEK AT 805 PM AND VESELEYVILLE AT 810 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. LAT...LON 4849 9825 4831 9831 4823 9734 4847 9732 30 NNNN
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 7:03 PM CDT | Severe Thunderstorm Warning | FGF | Ramsey | 42 min |
| Jul 31, 7:19 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 41 min |
| Jul 31, 7:33 PM CDT | Severe Thunderstorm Warning | FGF | Benson | 42 min |
| Jul 31, 7:36 PM CDT | Tornado Warning | FGF | Ramsey | 39 min |
| Jul 31, 8:06 PM CDT | Severe Thunderstorm Warning | FGF | Grand Forks | 54 min |
| Jul 31, 8:24 PM CDT | Severe Thunderstorm Warning | FGF | Nelson | 51 min |
| Jul 31, 8:26 PM CDT | Severe Thunderstorm Warning | FGF | Walsh | 49 min |
| Jul 31, 11:41 PM CDT | Severe Thunderstorm Warning | FGF | Eddy | 49 min |
| Aug 1, 12:09 AM CDT | Severe Thunderstorm Warning | FGF | Griggs | 51 min |
| Aug 1, 12:40 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Steele, Traill | 50 min |
| Aug 1, 12:53 AM CDT | Severe Thunderstorm Warning | FGF | Cass | 37 min |
| Aug 1, 1:33 AM CDT | Severe Thunderstorm Warning | FGF | Cass | 42 min |
| Aug 1, 1:37 AM CDT | Severe Thunderstorm Warning | FGF | Barnes | 23 min |
| Aug 1, 2:11 AM CDT | Severe Thunderstorm Warning | FGF | Cass | 49 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.