Alert archive / North Dakota / Tornado Warnings in 2002
Tornado Warning 33, NWS Grand Forks, ND
NWS Grand Forks, ND issued this tornado warning at Aug 31, 2002, 8:42 PM CDT for Cavalier County, North Dakota. It was in force for 33 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
- Aug 31, 2002, 8:42 PM CDT (01:42 UTC)
- Expired
- Aug 31, 2002, 9:15 PM CDT
- In force
- 33 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
County Cavalier County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 144 km from the middle of the area, began a volume at 01:43 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 31, 8:43 PM CDT | Hail 0.88 | Osnabrock, ND | |
| Aug 31, 9:25 PM CDT | Hail 1 | Olga, 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 |
|---|---|---|---|
| Aug 31, 7:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 00:00Z, 1.7 hours before the alert went out and 290 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
- 1564 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 2744 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted, in the capitals the NWS used until 2016.
270 WFUS53 KFGF 010142 TORFAR NDC019-010215- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 842 PM CDT SAT AUG 31 2002 THE NATIONAL WEATHER SERVICE IN GRAND FORKS HAS ISSUED A * TORNADO WARNING FOR... EAST CENTRAL CAVALIER COUNTY IN NORTHEAST NORTH DAKOTA. * UNTIL 915 PM CDT. * AT 838 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG ROTATION OVER OSNABROCK...OR ABOUT 13 MILES SOUTHEAST OF LANGDON...MOVEMENT WAS TO THE NORTHEAST AT 30 MPH. * THE TORNADO WILL BE NEAR... OLGA AT 850 PM. THIS IS A DANGEROUS STORM. IF YOU ARE IN THE PATH OF THIS TORNADO ABANDON CARS AND MOBILE HOMES FOR A STURDY BUILDING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT SUNDAY MORNING FOR NORTHWEST MINNESOTA AND NORTHEAST NORTH DAKOTA. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL MIDNIGHT SUNDAY MORNING FOR NORTHEAST NORTH DAKOTA. LAT...LON 4872 9826 4857 9812 4859 9795 4894 9796 04 NNNN
The office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 31, 7:13 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 47 min |
| Aug 31, 7:22 PM CDT | Flash Flood Warning | FGF | Cavalier | 4 hr |
| Aug 31, 7:45 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 45 min |
| Aug 31, 7:56 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 34 min |
| Aug 31, 8:32 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 43 min |
| Aug 31, 8:53 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 52 min |
| Aug 31, 9:00 PM CDT | Severe Thunderstorm Warning | FGF | Benson, Towner | 45 min |
| Aug 31, 9:11 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 49 min |
| Aug 31, 9:43 PM CDT | Severe Thunderstorm Warning | FGF | Benson, Ramsey, Towner | 62 min |
| Aug 31, 9:47 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 43 min |
| Aug 31, 10:02 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 43 min |
| Aug 31, 10:07 PM CDT | Flash Flood Warning | FGF | Cavalier, Pembina | 3 hr |
| Aug 31, 10:20 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Griggs | 55 min |
| Aug 31, 10:30 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 45 min |
| Aug 31, 10:45 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 45 min |
| Aug 31, 10:52 PM CDT | Severe Thunderstorm Warning | FGF | Cass | 53 min |
| Aug 31, 11:15 PM CDT | Severe Thunderstorm Warning | FGF | Barnes | 30 min |
| Aug 31, 11:18 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 42 min |
| Sep 1, 12:28 AM CDT | Severe Thunderstorm Warning | FGF | Sargent | 47 min |
| Sep 1, 1:19 AM CDT | Severe Thunderstorm Warning | FGF | Richland | 41 min |
Nearby
Tornado Warnings in North Dakota, 2002Every tornado warning in 2002Tornadoes 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.