Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 582

August 6, 20029 counties in Montana

The Storm Prediction Center issued this severe thunderstorm watch at Aug 6, 2002, 8:25 PM MDT for 9 counties in Montana. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 6, 2002, 8:25 PM MDT (02:25 UTC)
Expired
Aug 7, 2002, 2:00 AM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Daniels County, MT, Dawson County, MT, Garfield County, MT, McCone County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT, Wibaux County, MT

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Aug 6, 8:38 PM MDTTornado WarningGGWMcCone67 min
Aug 6, 9:46 PM MDTSevere Thunderstorm WarningGGWMcCone, Richland, Roosevelt59 min
Aug 6, 10:04 PM MDTSevere Thunderstorm WarningGGWMcCone, Richland, Roosevelt41 min
Aug 6, 10:38 PM MDTSevere Thunderstorm WarningGGWValley67 min
Aug 6, 11:44 PM MDTSevere Thunderstorm WarningGGWValley61 min
Aug 6, 11:51 PM MDTSevere Thunderstorm WarningGGWGarfield54 min
Aug 6, 11:54 PM MDTSevere Thunderstorm WarningGGWWibaux66 min
Aug 7, 12:49 AM MDTSevere Thunderstorm WarningGGWValley56 min
Aug 7, 12:53 AM MDTSevere Thunderstorm WarningGGWGarfield, McCone67 min
Aug 7, 1:55 AM MDTSevere Thunderstorm WarningGGWRoosevelt50 min

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.4 hours before the alert went out and 67 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, Glasgow Intl Airport, MT at 00:00Z on 2002-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2005 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, Glasgow Intl Airport, MT at 00:00Z on 2002-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
2005 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
1499 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.2

Open this sounding in Storm Lab

Nearby

Severe Thunderstorm Watches in Montana, 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.