Alert archive / North Dakota / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 445

June 22, 20074 counties in Montana; 27 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 22, 2007, 3:34 PM MDT for 4 counties in Montana; 27 counties in North Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 22, 2007, 3:34 PM MDT (21:34 UTC)
Expired
Jun 22, 2007, 10:00 PM MDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 31 counties

Dawson County, MT, Fallon County, MT, Prairie County, MT, Wibaux County, MT, Adams County, ND, Benson County, ND, Billings County, ND, Bottineau County, ND, Bowman County, ND, Cavalier County, ND, Dunn County, ND, Golden Valley County, ND, Hettinger County, ND, McHenry County, ND, McKenzie County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Oliver County, ND, Pembina County, ND, Pierce County, ND, Ramsey County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Slope County, ND, Stark County, ND, Towner County, ND, Walsh County, ND, Ward County, ND

What SPC expected

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

Two or more tornadoes
10%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
20%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
20%
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
Jun 22, 3:42 PM MDTSevere Thunderstorm WarningBISBottineau63 min
Jun 22, 3:56 PM MDTSevere Thunderstorm WarningBISMcLean64 min
Jun 22, 4:36 PM MDTSevere Thunderstorm WarningBISBillings, Dunn54 min
Jun 22, 4:37 PM MDTSevere Thunderstorm WarningGGWDawson, Wibaux53 min
Jun 22, 4:43 PM MDTSevere Thunderstorm WarningBISBottineau, Rolette62 min
Jun 22, 4:54 PM MDTTornado WarningBISBottineau, McHenry36 min
Jun 22, 5:11 PM MDTSevere Thunderstorm WarningBISDunn64 min
Jun 22, 5:25 PM MDTSevere Thunderstorm WarningBISBottineau, McHenry, Rolette65 min
Jun 22, 6:29 PM MDTSevere Thunderstorm WarningBISMcHenry61 min
Jun 22, 6:44 PM MDTTornado WarningBISMcHenry31 min
Jun 22, 7:30 PM MDTSevere Thunderstorm WarningBISMcHenry60 min
Jun 22, 7:51 PM MDTSevere Thunderstorm WarningFGFNelson, Ramsey, Walsh54 min
Jun 22, 8:16 PM MDTSevere Thunderstorm WarningBISMcHenry, Ward41 min
Jun 22, 8:23 PM MDTSevere Thunderstorm WarningFGFPembina67 min
Jun 22, 8:29 PM MDTSevere Thunderstorm WarningBISMcHenry36 min
Jun 22, 8:37 PM MDTSevere Thunderstorm WarningBISBottineau, Pierce, Rolette53 min
Jun 22, 9:39 PM MDTSevere Thunderstorm WarningBISPierce, Rolette50 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 12:00Z, 9.6 hours before the alert went out and 157 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 2007-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 788 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 2007-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 16 square meters per square second.1939Sfc1 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
788 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
745 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
16 m²/s²
0-3 km storm-relative helicity
96 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 22, 2:25 PM MDTMesoscale DiscussionSPCCuster, Dawson, Fallon, Prairie, Wibaux2 hr

Nearby

Severe Thunderstorm Watches in North Dakota, 2007Severe Thunderstorm Watches in Montana, 2007Every severe thunderstorm watch in 2007

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.