Alert archive / South Dakota / Severe Thunderstorm Watches in 2012

Severe Thunderstorm Watch 291

May 22, 201212 counties in North Dakota; 21 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at May 22, 2012, 5:54 PM CDT for 12 counties in North Dakota; 21 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 22, 2012, 5:54 PM CDT (22:54 UTC)
Expired
May 23, 2012, 1:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 33 counties

Cass County, ND, Dickey County, ND, Emmons County, ND, Grand Forks County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Beadle County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Lyman 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 Aberdeen radar (KABR), 49 km from the middle of the area, began a volume at 22:57 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
40%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 22, 6:34 PM CDTSevere Thunderstorm WarningABRCampbell, Edmunds, McPherson, Walworth41 min
May 22, 7:13 PM CDTSevere Thunderstorm WarningABRCampbell, McPherson23 min
May 22, 7:16 PM CDTSevere Thunderstorm WarningABREdmunds, McPherson, Walworth44 min
May 22, 7:19 PM CDTSevere Thunderstorm WarningBISDickey, LaMoure, Logan, McIntosh56 min
May 22, 7:24 PM CDTSevere Thunderstorm WarningABRJones, Lyman18 min
May 22, 8:00 PM CDTSevere Thunderstorm WarningABRBrown, Edmunds, McPherson33 min
May 22, 8:03 PM CDTSevere Thunderstorm WarningBISLaMoure, Logan, Stutsman42 min
May 22, 8:09 PM CDTSevere Thunderstorm WarningBISLaMoure, Logan, Stutsman36 min
May 22, 8:12 PM CDTSevere Thunderstorm WarningBISLaMoure, Logan, McIntosh33 min
May 22, 8:40 PM CDTSevere Thunderstorm WarningBISDickey, LaMoure, Logan, McIntosh41 min
May 22, 8:41 PM CDTSevere Thunderstorm WarningBISLaMoure, Logan, Stutsman49 min
May 22, 9:02 PM CDTSevere Thunderstorm WarningBISLaMoure, Stutsman28 min
May 22, 9:19 PM CDTSevere Thunderstorm WarningBISLaMoure, Stutsman56 min
May 22, 9:26 PM CDTTornado WarningBISLaMoure, Stutsman13 min
May 22, 9:46 PM CDTSevere Thunderstorm WarningFSDBeadle29 min
May 22, 9:50 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Griggs, Nelson, Steele40 min
May 22, 10:58 PM CDTSevere Thunderstorm WarningFGFBarnes, Griggs, Steele32 min
May 22, 11:02 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Walsh28 min
May 22, 11:19 PM CDTSevere Thunderstorm WarningABRHand26 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, 10.9 hours before the alert went out and 81 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, Aberdeen, SD at 12:00Z on 2012-05-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Aberdeen, SD at 12:00Z on 2012-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 296 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1654 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
296 m²/s²
0-3 km storm-relative helicity
279 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.

IssuedProductOfficeCountiesLasted
May 22, 3:44 PM CDTMesoscale DiscussionSPCBenson, Bottineau, Burke, Burleigh, Dunn, Eddy and 20 more91 min
May 22, 4:03 PM CDTTornado WatchSPCBarnes, Benson, Bottineau, Burke, Burleigh, Divide and 21 more7 hr
May 22, 6:11 PM CDTMesoscale DiscussionSPCAdams, Billings, Bowman, Hettinger, Slope, Stark94 min
May 22, 6:54 PM CDTMesoscale DiscussionSPCBenson, Bottineau, Burleigh, Eddy, Foster, Kidder and 9 more96 min
May 22, 2:59 PM CDTMesoscale DiscussionSPCAurora, Bennett, Brule, Buffalo, Campbell, Corson and 21 more91 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2012Severe Thunderstorm Watches in North Dakota, 2012Every 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.