Alert archive / South Dakota / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 553

August 3, 201213 counties in Minnesota; 20 counties in North Dakota; 40 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 3, 2012, 2:14 PM CDT for 13 counties in Minnesota; 20 counties in North Dakota; 40 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 3, 2012, 2:14 PM CDT (19:14 UTC)
Expired: Aug 3, 2012, 9:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 73 counties

Becker County, MN, Big Stone County, MN, Clay County, MN, Grant County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Traverse County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Nelson County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Walsh County, ND, Aurora County, SD, Beadle County, SD, Bon Homme County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Charles Mix County, SD, Clark County, SD, Codington County, SD, Davison County, SD, Day County, SD, Deuel County, SD, Douglas County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Gregory County, SD, Hamlin County, SD, Hand County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Hyde County, SD, Jerauld County, SD, Kingsbury County, SD, Lake County, SD, Marshall County, SD, McCook County, SD, McPherson County, SD, Miner County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Sully County, SD, Turner County, SD, Walworth County, SD, Yankton County, SD

The radar

The Aberdeen radar (KABR), 80 km from the middle of the area, began a volume at 19:17 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: 60%
One or more gusts of 65 knots or more: 40%
Ten or more severe hail reports: 60%
One or more hailstones of 2 inches or more: 40%
Six or more combined severe hail and wind reports: 90%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Aug 3, 2:41 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Walworth	64 min
Aug 3, 3:05 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Dewey, Walworth	55 min
Aug 3, 3:21 PM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Griggs, Nelson, Ramsey	54 min
Aug 3, 3:40 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, Faulk, Spink	65 min
Aug 3, 3:56 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, McPherson, Walworth	64 min
Aug 3, 3:58 PM CDT	Severe Thunderstorm Warning	FGF	Grand Forks, Griggs, Nelson, Ramsey, Walsh	49 min
Aug 3, 4:21 PM CDT	Tornado Warning	ABR	Edmunds	24 min
Aug 3, 4:35 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk	25 min
Aug 3, 4:43 PM CDT	Tornado Warning	ABR	Edmunds, Faulk	26 min
Aug 3, 4:44 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, Faulk, Spink	61 min
Aug 3, 4:54 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	51 min
Aug 3, 5:17 PM CDT	Severe Thunderstorm Warning	ABR	Faulk, Hand, Hyde, Spink	58 min
Aug 3, 5:34 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Clark, Day, McPherson, Marshall, Spink	56 min
Aug 3, 5:40 PM CDT	Tornado Warning	ABR	Spink	50 min
Aug 3, 5:45 PM CDT	Severe Thunderstorm Warning	FGF	Ransom, Richland, Sargent	60 min
Aug 3, 5:53 PM CDT	Severe Thunderstorm Warning	ABR	Clark, Day, Hand, Spink	67 min
Aug 3, 6:00 PM CDT	Severe Thunderstorm Warning	FSD	Beadle	45 min
Aug 3, 6:32 PM CDT	Severe Thunderstorm Warning	FSD	Beadle, Kingsbury, Sanborn	43 min
Aug 3, 6:33 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Otter Tail, Wilkin	57 min
Aug 3, 6:34 PM CDT	Severe Thunderstorm Warning	FGF	Norman, Polk	56 min
Aug 3, 6:35 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Clark, Codington, Day, Hamlin, Spink	25 min
Aug 3, 6:39 PM CDT	Tornado Warning	FGF	Clay, Norman	51 min
Aug 3, 6:50 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix, Douglas	40 min
Aug 3, 6:53 PM CDT	Severe Thunderstorm Warning	ABR	Big Stone	67 min
Aug 3, 7:10 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Beadle, Davison, Jerauld, Kingsbury, Sanborn	50 min
Aug 3, 7:11 PM CDT	Severe Thunderstorm Warning	FGF	Clearwater, Mahnomen, Norman, Polk, Red Lake	64 min
Aug 3, 7:20 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Hubbard, Otter Tail, Wadena, Wilkin	55 min
Aug 3, 7:22 PM CDT	Tornado Warning	FGF	Clearwater, Polk, Red Lake	39 min
Aug 3, 7:23 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Kingsbury, Lake, Miner, Sanborn	52 min
Aug 3, 7:32 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Mahnomen, Norman	58 min
Aug 3, 7:44 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wilkin	61 min
Aug 3, 7:46 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Davison, Hanson, Kingsbury, Lake, McCook and 2 more	44 min
Aug 3, 7:54 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Pennington, Polk, Red Lake	66 min
Aug 3, 7:57 PM CDT	Tornado Warning	FGF	Becker, Clay, Mahnomen, Norman	48 min
Aug 3, 7:59 PM CDT	Severe Thunderstorm Warning	ABR	Deuel, Hamlin	31 min
Aug 3, 8:03 PM CDT	Severe Thunderstorm Warning	ABR	Traverse	27 min
Aug 3, 8:06 PM CDT	Severe Thunderstorm Warning	FGF	Grant, Otter Tail, Wilkin	54 min
Aug 3, 8:12 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clay, Clearwater, Hubbard, Otter Tail, Wadena	63 min
Aug 3, 8:20 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Beltrami, Clearwater, Hubbard, Mahnomen, Norman and 1 more	55 min
Aug 3, 8:27 PM CDT	Severe Thunderstorm Warning	FGF	Beltrami, Clearwater, Lake of the Woods, Marshall, Roseau	63 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

Aberdeen, SD (KABR), launched 12:00Z, 7.2 hours before the alert went out and 140 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: 254 J/kg
Mixed-layer CIN: -271 J/kg
Mixed-layer LCL: 1688 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 132 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
Aug 3, 6:19 PM CDT	Mesoscale Discussion	SPC	Becker, Big Stone, Brown, Chippewa, Clay, Cottonwood and 28 more	86 min
Aug 2, 7:10 PM CDT	Mesoscale Discussion	SPC	Adams, Billings, Bowman, Divide, Dunn, Golden Valley and 5 more	95 min
Aug 3, 1:31 PM CDT	Mesoscale Discussion	SPC	Barnes, Cass, Cavalier, Dickey, Eddy, Emmons and 16 more	59 min
Aug 3, 1:02 AM CDT	Mesoscale Discussion	SPC	Gregory	88 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2012 Severe Thunderstorm Watches in North Dakota, 2012 Severe Thunderstorm Watches in Minnesota, 2012 Every severe thunderstorm watch in 2012

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.