Alert archive / South Dakota / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 442

August 10, 201621 counties in Minnesota; 11 counties in North Dakota; 31 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 10, 2016, 8:00 PM CDT for 21 counties in Minnesota; 11 counties in North Dakota; 31 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 10, 2016, 8:00 PM CDT (01:00 UTC)
Expired
Aug 11, 2016, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 63 counties

Becker County, MN, Big Stone County, MN, Clay County, MN, Clearwater County, MN, Douglas County, MN, Grant County, MN, Hubbard County, MN, Lac qui Parle County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Pope County, MN, Red Lake County, MN, Stevens County, MN, Swift County, MN, Todd County, MN, Traverse County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Grand Forks County, ND, Griggs County, ND, Nelson County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Traill County, ND, Walsh County, ND, Beadle County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Corson County, SD, Day County, SD, Deuel County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lyman County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Fargo/Grand Forks radar (KMVX), 103 km from the middle of the area, began a volume at 01:00 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
2%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Aug 10, 8:05 PM CDTSevere Thunderstorm WarningABRPotter18 min
Aug 10, 8:10 PM CDTSevere Thunderstorm WarningABRHughes, Jones, Lyman, Stanley35 min
Aug 10, 8:22 PM CDTSevere Thunderstorm WarningABREdmunds, McPherson24 min
Aug 10, 8:30 PM CDTFlash Flood WarningABRDewey, Potter6 hr
Aug 10, 8:32 PM CDTSevere Thunderstorm WarningABRDewey, Potter, Walworth28 min
Aug 10, 8:53 PM CDTTornado WarningABRPotter24 min
Aug 10, 8:58 PM CDTSevere Thunderstorm WarningABRPotter, Walworth20 min
Aug 10, 9:02 PM CDTSevere Thunderstorm WarningABRHughes, Jones, Lyman, Stanley, Sully43 min
Aug 10, 9:22 PM CDTSevere Thunderstorm WarningABRBrown, Edmunds38 min
Aug 10, 9:36 PM CDTSevere Thunderstorm WarningABRBrown, Edmunds39 min
Aug 10, 9:38 PM CDTFlash Flood WarningFGFBenson, Eddy, Nelson, Ramsey4 hr
Aug 10, 9:57 PM CDTSevere Thunderstorm WarningABRBrown, Spink33 min
Aug 10, 10:14 PM CDTSevere Thunderstorm WarningABRBrown, Day, Spink46 min
Aug 10, 10:28 PM CDTSevere Thunderstorm WarningABRClark, Day, Spink24 min
Aug 11, 12:00 AM CDTSevere Thunderstorm WarningFSDBeadle, Jerauld, Kingsbury, Miner, Sanborn45 min
Aug 11, 12:02 AM CDTSevere Thunderstorm WarningABRClark, Hamlin43 min
Aug 11, 12:12 AM CDTSevere Thunderstorm WarningFSDKingsbury33 min
Aug 11, 12:53 AM CDTSevere Thunderstorm WarningFSDBrookings, Kingsbury, Lake, Miner37 min
Aug 11, 1:26 AM CDTSevere Thunderstorm WarningFSDBrookings, Lake, McCook, Minnehaha, Moody34 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 00:00Z, 1.0 hours before the alert went out and 202 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 00:00Z on 2016-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 984 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, Aberdeen, SD at 00:00Z on 2016-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 347 square meters per square second.19395878Sfc1 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
984 J/kg
Mixed-layer CIN
-270 J/kg
Mixed-layer LCL
1716 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
347 m²/s²
0-3 km storm-relative helicity
497 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 10, 10:50 PM CDTMesoscale DiscussionSPCBecker, Big Stone, Chippewa, Clay, Clearwater, Douglas and 16 more85 min
Aug 10, 8:54 PM CDTMesoscale DiscussionSPCAdams, Benson, Billings, Bottineau, Burke, Burleigh and 31 more66 min
Aug 11, 12:37 PM CDTMesoscale DiscussionSPCBon Homme, Charles Mix, Clay, Union, Yankton2 hr
Aug 11, 2:35 PM CDTMesoscale DiscussionSPCCuster, Fall River, Lawrence, Oglala Lakota, Pennington2 hr
Aug 11, 3:26 PM CDTMesoscale DiscussionSPCClay, Union2 hr
Aug 11, 3:55 PM CDTSevere Thunderstorm WatchSPCClay, Union, Yankton7 hr
Aug 11, 5:56 PM CDTMesoscale DiscussionSPCBennett, Haakon, Hughes, Jackson, Jones, Mellette and 6 more94 min
Aug 11, 6:17 PM CDTMesoscale DiscussionSPCClay, Union, Yankton58 min
Aug 11, 6:29 PM CDTSevere Thunderstorm WatchSPCBennett, Gregory, Jackson, Jones, Lyman, Mellette and 2 more7 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 2016Severe Thunderstorm Watches in Minnesota, 2016Severe Thunderstorm Watches in North Dakota, 2016Every severe thunderstorm watch in 2016

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.