Alert archive / South Dakota / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 302

May 28, 200713 counties in North Dakota; 25 counties in South Dakota; Crook County, Weston County, Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2007, 3:35 PM MDT for 13 counties in North Dakota; 25 counties in South Dakota; Crook County, Weston County, Wyoming. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: May 28, 2007, 3:35 PM MDT (21:35 UTC)
Expired: May 29, 2007, 1:00 AM MDT
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 2.5 in
Strongest gust expected: 60 kt

All 40 counties

Adams County, ND, Burleigh County, ND, Dickey County, ND, Emmons County, ND, Foster County, ND, Grant County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Morton County, ND, Sioux County, ND, Stutsman County, ND, Brown County, SD, Butte County, SD, Campbell County, SD, Corson County, SD, Custer County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Haakon County, SD, Harding County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jones County, SD, Lawrence County, SD, Lyman County, SD, McPherson County, SD, Meade County, SD, Pennington County, SD, Perkins County, SD, Potter County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD, Ziebach County, SD, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 130 km from the middle of the area, began a volume at 21:36 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: 10%
Ten or more severe wind reports: 50%
One or more gusts of 65 knots or more: 40%
Ten or more severe hail reports: 80%
One or more hailstones of 2 inches or more: 50%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 28, 4:13 PM MDT	Severe Thunderstorm Warning	UNR	Crook	77 min
May 28, 5:06 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence	54 min
May 28, 5:20 PM MDT	Severe Thunderstorm Warning	UNR	Crook	55 min
May 28, 5:56 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence, Meade	64 min
May 28, 6:09 PM MDT	Severe Thunderstorm Warning	UNR	Butte	63 min
May 28, 6:10 PM MDT	Severe Thunderstorm Warning	UNR	Custer	65 min
May 28, 6:16 PM MDT	Severe Thunderstorm Warning	UNR	Lawrence	59 min
May 28, 6:35 PM MDT	Severe Thunderstorm Warning	UNR	Weston	55 min
May 28, 6:55 PM MDT	Severe Thunderstorm Warning	UNR	Meade	95 min
May 28, 6:58 PM MDT	Tornado Warning	UNR	Meade	47 min
May 28, 7:06 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	54 min
May 28, 7:09 PM MDT	Severe Thunderstorm Warning	UNR	Meade	66 min
May 28, 7:42 PM MDT	Tornado Warning	UNR	Meade	48 min
May 28, 7:52 PM MDT	Severe Thunderstorm Warning	UNR	Meade, Pennington	53 min
May 28, 8:25 PM MDT	Severe Thunderstorm Warning	UNR	Meade	65 min
May 28, 8:34 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Ziebach	86 min
May 28, 8:42 PM MDT	Severe Thunderstorm Warning	UNR	Pennington	33 min
May 28, 9:13 PM MDT	Severe Thunderstorm Warning	UNR	Ziebach	54 min
May 28, 9:53 PM MDT	Severe Thunderstorm Warning	ABR	Campbell	31 min
May 28, 9:56 PM MDT	Severe Thunderstorm Warning	UNR	Haakon, Ziebach	49 min
May 28, 11:17 PM MDT	Severe Thunderstorm Warning	ABR	Campbell, McPherson	28 min
May 28, 11:20 PM MDT	Severe Thunderstorm Warning	BIS	McIntosh	55 min
May 28, 11:26 PM MDT	Severe Thunderstorm Warning	BIS	Emmons	64 min
May 28, 11:42 PM MDT	Flash Flood Warning	ABR	Campbell, McPherson	6 hr
May 28, 11:53 PM MDT	Severe Thunderstorm Warning	BIS	Logan, Stutsman	67 min
May 29, 12:24 AM MDT	Flash Flood Warning	ABR	Dewey	6 hr

Discussions around it

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

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 9.6 hours before the alert went out and 137 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3389 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 101 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.

Issued	Product	Office	Counties	Lasted
May 28, 6:27 AM MDT	Mesoscale Discussion	SPC	Benson, Bottineau, McHenry, McLean, Pierce, Rolette and 3 more	93 min
May 28, 2:17 PM MDT	Mesoscale Discussion	SPC	Barnes, Benson, Cavalier, Dickey, Eddy, Foster and 14 more	118 min
May 28, 4:35 PM MDT	Tornado Watch	SPC	Barnes, Benson, Cass, Cavalier, Eddy, Grand Forks and 7 more	4 hr
May 28, 2:02 PM MDT	Mesoscale Discussion	SPC	Custer, Fall River, Haakon, Lawrence, Meade, Pennington and 1 more	2 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 2007 Severe Thunderstorm Watches in North Dakota, 2007 Severe Thunderstorm Watches in Wyoming, 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.