Alert archive / North Dakota / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 644

July 30, 200118 counties in North Dakota; 13 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 30, 2001, 11:45 PM CDT for 18 counties in North Dakota; 13 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 30, 2001, 11:45 PM CDT (04:45 UTC)
Expired
Jul 31, 2001, 5:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 31 counties

Barnes County, ND, Cass County, ND, Dickey County, ND, Emmons County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Nelson County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Brown County, SD, Campbell County, SD, Edmunds County, SD, Faulk County, SD, Hughes County, SD, Hyde County, SD, Jones County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 31, 12:17 AM CDTSevere Thunderstorm WarningBISEmmons, Sioux43 min
Jul 31, 12:17 AM CDTSevere Thunderstorm WarningABRCampbell13 min
Jul 31, 12:35 AM CDTSevere Thunderstorm WarningBISLogan, McIntosh55 min
Jul 31, 1:54 AM CDTSevere Thunderstorm WarningBISStutsman51 min
Jul 31, 2:37 AM CDTSevere Thunderstorm WarningFGFBarnes, Cass, Griggs, Steele23 min
Jul 31, 3:26 AM CDTSevere Thunderstorm WarningFGFGrand Forks, Steele, Traill34 min

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 4.8 hours before the alert went out and 123 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 2001-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3783 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 2001-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 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
3783 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
954 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
239 m²/s²
Significant tornado parameter
3.6
Supercell composite
14.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 31, 4:00 PM CDTTornado WatchSPCBarnes, Cass, Dickey, Eddy, Foster, Grand Forks and 10 more6 hr
Jul 30, 8:00 PM CDTSevere Thunderstorm WatchSPCButte, Corson, Custer, Dewey, Haakon, Harding and 7 more5 hr
Jul 31, 5:30 PM CDTSevere Thunderstorm WatchSPCAurora, Beadle, Bon Homme, Brown, Brule, Buffalo and 20 more7 hr

Nearby

Severe Thunderstorm Watches in North Dakota, 2001Severe Thunderstorm Watches in South Dakota, 2001Every severe thunderstorm watch in 2001

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.