Alert archive / North Dakota / Severe Thunderstorm Watches in 2006

Severe Thunderstorm Watch 739

August 24, 20065 counties in Montana; 26 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 24, 2006, 3:42 AM MDT for 5 counties in Montana; 26 counties in North Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Aug 24, 2006, 3:42 AM MDT (09:42 UTC)
Expired
Aug 24, 2006, 11:00 AM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 31 counties

Dawson County, MT, Richland County, MT, Roosevelt County, MT, Sheridan County, MT, Wibaux County, MT, Billings County, ND, Bottineau County, ND, Burke County, ND, Burleigh County, ND, Divide County, ND, Dunn County, ND, Golden Valley County, ND, Grant County, ND, Hettinger County, ND, Kidder County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pierce County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Wells County, ND, Williams County, ND

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
5%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Aug 24, 4:27 AM MDTSevere Thunderstorm WarningGGWRichland, Roosevelt, Sheridan50 min
Aug 24, 4:49 AM MDTSevere Thunderstorm WarningGGWRichland26 min
Aug 24, 5:03 AM MDTSevere Thunderstorm WarningBISMcKenzie, Williams57 min
Aug 24, 5:56 AM MDTSevere Thunderstorm WarningBISDunn, McKenzie64 min
Aug 24, 6:31 AM MDTSevere Thunderstorm WarningBISMcLean, Mercer59 min
Aug 24, 6:50 AM MDTTornado WarningBISMercer25 min
Aug 24, 6:58 AM MDTSevere Thunderstorm WarningBISDunn32 min
Aug 24, 7:27 AM MDTSevere Thunderstorm WarningBISDunn, McLean, Mercer63 min
Aug 24, 8:31 AM MDTSevere Thunderstorm WarningBISMcLean, Mercer59 min
Aug 24, 8:43 AM MDTTornado WarningBISMercer32 min
Aug 24, 9:07 AM MDTSevere Thunderstorm WarningGGWRichland8 min
Aug 24, 9:12 AM MDTSevere Thunderstorm WarningBISMcKenzie63 min
Aug 24, 9:13 AM MDTTornado WarningBISMcLean, Mercer, Oliver47 min
Aug 24, 10:00 AM MDTSevere Thunderstorm WarningBISMcLean, Oliver45 min
Aug 24, 10:10 AM MDTSevere Thunderstorm WarningBISBillings, Dunn, Stark65 min
Aug 24, 10:19 AM MDTSevere Thunderstorm WarningBISMcKenzie56 min
Aug 24, 10:30 AM MDTSevere Thunderstorm WarningBISHettinger, Slope, Stark60 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 00:00Z, 9.7 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 2006-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3169 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 2006-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 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
3169 J/kg
Mixed-layer CIN
-103 J/kg
Mixed-layer LCL
1732 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
87 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 24, 3:14 AM MDTMesoscale DiscussionSPCDawson, Fallon, McCone, Prairie, Richland, Roosevelt and 2 more91 min
Aug 23, 7:05 PM MDTMesoscale DiscussionSPCAdams, Billings, Burleigh, Dunn, Emmons, Grant and 8 more85 min
Aug 24, 7:00 AM MDTMesoscale DiscussionSPCBenson, Bottineau, Burke, Burleigh, Dunn, Eddy and 22 more2 hr
Aug 24, 10:52 AM MDTSevere Thunderstorm WatchSPCAdams, Barnes, Benson, Bottineau, Burke, Burleigh and 31 more5 hr
Aug 24, 1:57 PM MDTMesoscale DiscussionSPCBarnes, Benson, Burleigh, Cass, Dickey, Eddy and 16 more2 hr
Aug 24, 2:40 PM MDTTornado WatchSPCBarnes, Benson, Cass, Dickey, Eddy, Emmons and 15 more6 hr
Aug 24, 5:03 PM MDTMesoscale DiscussionSPCBarnes, Cass, Dickey, LaMoure, Ransom, Richland and 1 more87 min

Nearby

Severe Thunderstorm Watches in North Dakota, 2006Severe Thunderstorm Watches in Montana, 2006Every severe thunderstorm watch in 2006

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.