Alert archive / North Dakota / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 381

June 11, 20074 states

The Storm Prediction Center issued this severe thunderstorm watch at Jun 11, 2007, 2:26 PM MDT for 4 states. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued: Jun 11, 2007, 2:26 PM MDT (20:26 UTC)
Expired: Jun 11, 2007, 10:00 PM MDT
In force: 8 hr
Issued by: the Storm Prediction Center
Largest hail expected: 3 in
Strongest gust expected: 70 kt

All 41 counties

Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Wibaux County, MT, Adams County, ND, Billings County, ND, Bottineau County, ND, Bowman County, ND, Burke County, ND, Burleigh County, ND, Divide County, ND, Dunn County, ND, Emmons County, ND, Golden Valley County, ND, Grant 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, Renville County, ND, Sioux County, ND, Slope County, ND, Stark County, ND, Ward County, ND, Williams County, ND, Butte County, SD, Harding County, SD, Lawrence County, SD, Meade County, SD, Perkins County, SD, Campbell County, WY, Crook County, WY, Weston County, WY

The radar

The Bismarck radar (KBIS), 227 km from the middle of the area, began a volume at 20:29 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

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

Two or more tornadoes: 20%
One or more EF2 to EF5 tornadoes: 5%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 70%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 80%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Jun 11, 4:01 PM MDT	Severe Thunderstorm Warning	UNR	Meade	74 min
Jun 11, 4:14 PM MDT	Severe Thunderstorm Warning	BIS	Divide	61 min
Jun 11, 4:40 PM MDT	Tornado Warning	BIS	Divide	35 min
Jun 11, 5:14 PM MDT	Severe Thunderstorm Warning	UNR	Meade	46 min
Jun 11, 5:15 PM MDT	Tornado Warning	BIS	Divide	30 min
Jun 11, 5:45 PM MDT	Severe Thunderstorm Warning	BIS	Divide	60 min
Jun 11, 9:26 PM MDT	Severe Thunderstorm Warning	BIS	Divide	64 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

Glasgow Intl Airport, MT (KGGW), launched 12:00Z, 8.4 hours before the alert went out and 257 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 225 J/kg
Mixed-layer CIN: -182 J/kg
Mixed-layer LCL: 1633 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 1:53 PM MDT	Mesoscale Discussion	SPC	Carter, Fallon, Powder River, Wibaux	2 hr
Jun 10, 10:19 PM MDT	Mesoscale Discussion	SPC	Dickey, Richland, Sargent	116 min
Jun 10, 10:47 PM MDT	Severe Thunderstorm Watch	SPC	Dickey, Emmons, LaMoure, Logan, McIntosh, Ransom and 3 more	6 hr
Jun 11, 4:53 PM MDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Burke, Dunn, Grant and 12 more	97 min
Jun 11, 2:47 PM MDT	Severe Thunderstorm Watch	SPC	Bennett, Campbell, Corson, Dewey, Haakon, Hughes and 10 more	7 hr

Nearby

Severe Thunderstorm Watches in North Dakota, 2007 Severe Thunderstorm Watches in Montana, 2007 Severe Thunderstorm Watches in South Dakota, 2007 Every 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; radar from the NEXRAD Level II archive.