Alert archive / North Dakota / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 476

July 3, 200730 counties in North Dakota; 16 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 3, 2007, 1:21 AM MDT for 30 counties in North Dakota; 16 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 3, 2007, 1:21 AM MDT (07:21 UTC)
Expired
Jul 3, 2007, 8:00 AM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
70 kt
All 46 counties

Adams County, ND, Barnes County, ND, Benson County, ND, Bowman County, ND, Burleigh County, ND, Cass County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grand Forks County, ND, Grant County, ND, Griggs County, ND, Hettinger County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Morton County, ND, Nelson County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Sioux County, ND, Slope County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Wells County, ND, Brown County, SD, Campbell County, SD, Corson County, SD, Day County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hyde County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Sully County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 67 km from the middle of the area, began a volume at 07:23 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
10%
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
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

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

IssuedProductOfficeCountiesLasted
Jul 3, 2:46 AM MDTSevere Thunderstorm WarningBISPierce, Wells59 min
Jul 3, 3:13 AM MDTSevere Thunderstorm WarningFGFBenson, Eddy62 min
Jul 3, 3:57 AM MDTSevere Thunderstorm WarningABRCorson, Dewey, Walworth48 min
Jul 3, 4:46 AM MDTSevere Thunderstorm WarningABRDewey, Potter, Walworth44 min
Jul 3, 5:25 AM MDTSevere Thunderstorm WarningABRFaulk, Hand, Hyde, Potter, Sully65 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, 7.4 hours before the alert went out and 63 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 2007-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1417 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 2007-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.193958Sfc1 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
1417 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
1562 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
40 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.

IssuedProductOfficeCountiesLasted
Jul 2, 6:45 PM MDTMesoscale DiscussionSPCBurke, Divide, Mountrail, Renville, Ward, Williams90 min
Jul 2, 9:55 PM MDTMesoscale DiscussionSPCBenson, Billings, Bottineau, Burke, Burleigh, Divide and 22 more65 min
Jul 2, 10:13 PM MDTSevere Thunderstorm WatchSPCBillings, Bottineau, Burke, Divide, Dunn, Golden Valley and 13 more5 hr
Jul 3, 12:58 AM MDTMesoscale DiscussionSPCAdams, Barnes, Benson, Billings, Bottineau, Bowman and 31 more2 hr
Jul 3, 4:41 AM MDTMesoscale DiscussionSPCAdams, Barnes, Bowman, Cass, Dickey, Emmons and 15 more2 hr
Jul 3, 5:39 AM MDTMesoscale DiscussionSPCRichland2 hr
Jul 2, 8:19 PM MDTMesoscale DiscussionSPCButte, Custer, Fall River, Harding, Lawrence, Meade and 3 more86 min
Jul 3, 2:36 PM MDTMesoscale DiscussionSPCClay, Lincoln, Union, Yankton84 min
Jul 3, 2:59 PM MDTTornado WatchSPCBon Homme, Clay, Lincoln, Union, Yankton8 hr
Jul 3, 5:55 PM MDTMesoscale DiscussionSPCBon Homme, Clay, Lincoln, Union, Yankton95 min

Nearby

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