Alert archive / North Dakota / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 559

July 31, 200223 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 31, 2002, 3:50 PM CDT for 23 counties in North Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 31, 2002, 3:50 PM CDT (20:50 UTC)
Expired
Jul 31, 2002, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 23 counties

Benson County, ND, Bottineau County, ND, Burke County, ND, Burleigh County, ND, Dunn County, ND, Eddy County, ND, Foster County, ND, Kidder County, ND, McHenry County, ND, McLean County, ND, Mercer County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Ramsey County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Stark County, ND, Stutsman County, ND, Towner County, ND, Ward County, ND, Wells County, ND

Warnings issued inside it

15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 31, 4:17 PM CDTSevere Thunderstorm WarningBISMcHenry58 min
Jul 31, 5:08 PM CDTSevere Thunderstorm WarningBISPierce67 min
Jul 31, 5:10 PM CDTSevere Thunderstorm WarningBISWard50 min
Jul 31, 5:40 PM CDTSevere Thunderstorm WarningBISMcLean65 min
Jul 31, 6:13 PM CDTTornado WarningFGFBenson32 min
Jul 31, 6:17 PM CDTSevere Thunderstorm WarningBISMcHenry, Ward58 min
Jul 31, 6:18 PM CDTTornado WarningFGFRamsey42 min
Jul 31, 6:30 PM CDTSevere Thunderstorm WarningBISPierce45 min
Jul 31, 6:46 PM CDTSevere Thunderstorm WarningFGFBenson44 min
Jul 31, 6:58 PM CDTSevere Thunderstorm WarningBISOliver47 min
Jul 31, 7:03 PM CDTSevere Thunderstorm WarningFGFRamsey42 min
Jul 31, 7:22 PM CDTSevere Thunderstorm WarningBISBurleigh, Sheridan53 min
Jul 31, 7:31 PM CDTSevere Thunderstorm WarningBISBottineau, Rolette59 min
Jul 31, 7:33 PM CDTSevere Thunderstorm WarningFGFBenson42 min
Jul 31, 7:36 PM CDTTornado WarningFGFRamsey39 min

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 8.8 hours before the alert went out and 145 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 12:00Z on 2002-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 307 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 12:00Z on 2002-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 97 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
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

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 31, 6:25 PM CDTSevere Thunderstorm WatchSPCBarnes, Cass, Cavalier, Grand Forks, Griggs, Nelson and 7 more7 hr

Nearby

Severe Thunderstorm Watches in North Dakota, 2002Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive.