Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 321, NWS Grand Forks, ND

August 31, 2002Benson County, Towner County, North Dakota

NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 31, 2002, 9:00 PM CDT for Benson County, Towner County, North Dakota. It was in force for 45 min. 4 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 31, 2002, 9:00 PM CDT (02:00 UTC)
Expired
Aug 31, 2002, 9:45 PM CDT
In force
45 min
Issued by
NWS Grand Forks, ND
Area
Counties, with a storm outline in the text

Counties Benson County, ND, Towner County, ND

What was reported inside it

TimeReportWhereRemark
Aug 31, 9:20 PM CDTHail 1Cando, ND
Aug 31, 9:35 PM CDTHail 1.75Leeds, ND
Aug 31, 9:45 PM CDTHail 1.75Leeds, ND
Aug 31, 9:50 PM CDTHail 0.88Cando, 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.

IssuedProductOfficeLasted
Aug 31, 7:00 PM CDTSevere Thunderstorm WatchSPC5 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 2.0 hours before the alert went out and 207 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.

Skew-T log-pSkew-T log-p diagram, Bismarck Municip, ND at 00:00Z on 2002-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1564 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Bismarck Municip, ND at 00:00Z on 2002-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

The office that day

Everything else NWS Grand Forks, ND issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 31, 8:53 PM CDTSevere Thunderstorm WarningFGFKittson52 min
Aug 31, 11:46 PM CDTSevere Thunderstorm WarningFGFClay44 min
Sep 1, 12:02 AM CDTSevere Thunderstorm WarningFGFMarshall43 min
Sep 1, 12:20 AM CDTSevere Thunderstorm WarningFGFPolk40 min
Sep 1, 12:24 AM CDTSevere Thunderstorm WarningFGFPennington, Red Lake51 min
Sep 1, 12:52 AM CDTSevere Thunderstorm WarningFGFNorman, Polk38 min
Sep 1, 1:16 AM CDTSevere Thunderstorm WarningFGFRoseau29 min
Sep 1, 1:50 AM CDTSevere Thunderstorm WarningFGFBeltrami40 min
Aug 31, 7:13 PM CDTSevere Thunderstorm WarningFGFCavalier47 min
Aug 31, 7:22 PM CDTFlash Flood WarningFGFCavalier4 hr
Aug 31, 7:45 PM CDTSevere Thunderstorm WarningFGFPembina45 min
Aug 31, 7:56 PM CDTSevere Thunderstorm WarningFGFCavalier34 min
Aug 31, 8:32 PM CDTSevere Thunderstorm WarningFGFCavalier43 min
Aug 31, 8:42 PM CDTTornado WarningFGFCavalier33 min
Aug 31, 9:11 PM CDTSevere Thunderstorm WarningFGFCavalier49 min
Aug 31, 9:43 PM CDTSevere Thunderstorm WarningFGFBenson, Ramsey, Towner62 min
Aug 31, 9:47 PM CDTSevere Thunderstorm WarningFGFPembina43 min
Aug 31, 10:02 PM CDTSevere Thunderstorm WarningFGFCavalier43 min
Aug 31, 10:07 PM CDTFlash Flood WarningFGFCavalier, Pembina3 hr
Aug 31, 10:20 PM CDTSevere Thunderstorm WarningFGFBarnes, Griggs55 min
Aug 31, 10:30 PM CDTSevere Thunderstorm WarningFGFPembina45 min
Aug 31, 10:45 PM CDTSevere Thunderstorm WarningFGFCavalier45 min
Aug 31, 10:52 PM CDTSevere Thunderstorm WarningFGFCass53 min
Aug 31, 11:15 PM CDTSevere Thunderstorm WarningFGFBarnes30 min
Aug 31, 11:18 PM CDTSevere Thunderstorm WarningFGFPembina42 min
Sep 1, 12:28 AM CDTSevere Thunderstorm WarningFGFSargent47 min
Sep 1, 1:19 AM CDTSevere Thunderstorm WarningFGFRichland41 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.