Alert archive / Montana / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 611

August 16, 200210 counties in Montana; 5 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 16, 2002, 12:20 PM MDT for 10 counties in Montana; 5 counties in North Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 16, 2002, 12:20 PM MDT (18:20 UTC)
Expired
Aug 16, 2002, 6:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Daniels County, MT, Dawson County, MT, Garfield County, MT, McCone County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Valley County, MT, Wibaux County, MT, Billings County, ND, Divide County, ND, Golden Valley County, ND, McKenzie County, ND, Williams County, ND

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Aug 16, 2:20 PM MDTSevere Thunderstorm WarningGGWRoosevelt55 min
Aug 16, 2:32 PM MDTSevere Thunderstorm WarningGGWMcCone58 min
Aug 16, 3:18 PM MDTSevere Thunderstorm WarningGGWRichland42 min
Aug 16, 3:21 PM MDTSevere Thunderstorm WarningBISBillings, Golden Valley54 min
Aug 16, 3:51 PM MDTSevere Thunderstorm WarningGGWWibaux39 min

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 6.3 hours before the alert went out and 389 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 2002-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2002-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1678 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
176 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 16, 2:40 PM MDTSevere Thunderstorm WatchSPCAdams, Billings, Bottineau, Burke, Burleigh, Dunn and 18 more5 hr
Aug 16, 5:25 PM MDTSevere Thunderstorm WatchSPCBarnes, Cass, Dickey, Eddy, Foster, Grand Forks and 11 more6 hr

Nearby

Severe Thunderstorm Watches in Montana, 2002Severe 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.