Alert archive / South Dakota / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 403

July 8, 20138 counties in North Dakota; 15 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jul 8, 2013, 9:31 PM CDT for 8 counties in North Dakota; 15 counties in South Dakota. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 8, 2013, 9:31 PM CDT (02:31 UTC)
Expired
Jul 9, 2013, 4:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
65 kt
All 23 counties

Barnes County, ND, Benson County, ND, Eddy County, ND, Griggs County, ND, Nelson County, ND, Ramsey County, ND, Ransom County, ND, Steele County, ND, Brown County, SD, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, McPherson County, SD, Potter County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Walworth County, SD

The radar

The Bismarck radar (KBIS), 106 km from the middle of the area, began a volume at 02:31 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
50%
One or more gusts of 65 knots or more
40%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 8, 10:30 PM CDTSevere Thunderstorm WarningABRDewey45 min
Jul 8, 10:59 PM CDTSevere Thunderstorm WarningABRCorson, Dewey, Walworth46 min
Jul 8, 11:12 PM CDTSevere Thunderstorm WarningABRCorson, Dewey48 min
Jul 8, 11:14 PM CDTSevere Thunderstorm WarningABRDewey46 min
Jul 8, 11:56 PM CDTSevere Thunderstorm WarningABRCampbell, Corson, Dewey, Walworth49 min
Jul 9, 12:49 AM CDTSevere Thunderstorm WarningFGFBenson, Cavalier, Ramsey, Towner41 min
Jul 9, 12:53 AM CDTSevere Thunderstorm WarningABRCampbell, Corson, Dewey, Edmunds, Faulk, McPherson and 2 more37 min
Jul 9, 1:12 AM CDTSevere Thunderstorm WarningABREdmunds, McPherson48 min
Jul 9, 1:13 AM CDTSevere Thunderstorm WarningABRDewey, Hughes, Jones, Lyman, Potter, Stanley and 1 more47 min
Jul 9, 1:27 AM CDTSevere Thunderstorm WarningFGFCavalier, Ramsey, Walsh48 min
Jul 9, 1:32 AM CDTSevere Thunderstorm WarningABRCampbell, Edmunds, Faulk, McPherson, Potter, Walworth43 min
Jul 9, 1:55 AM CDTSevere Thunderstorm WarningABRBuffalo, Faulk, Hand, Hughes, Hyde, Lyman and 3 more50 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, 2.5 hours before the alert went out and 102 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 2013-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 833 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 2013-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
833 J/kg
Mixed-layer CIN
-113 J/kg
Mixed-layer LCL
1718 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
23 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 8, 8:42 PM CDTMesoscale DiscussionSPCAdams, Benson, Billings, Bowman, Burleigh, Dunn and 18 more2 hr
Jul 8, 11:43 PM CDTMesoscale DiscussionSPCBarnes, Benson, Burleigh, Dickey, Eddy, Emmons and 16 more2 hr
Jul 9, 2:52 AM CDTMesoscale DiscussionSPCCass, Grand Forks, Pembina, Richland, Sargent, Traill and 1 more83 min
Jul 8, 7:36 PM CDTMesoscale DiscussionSPCAurora, Bennett, Brule, Buffalo, Charles Mix, Douglas and 9 more84 min
Jul 8, 10:03 PM CDTMesoscale DiscussionSPCAurora, Bennett, Bon Homme, Brule, Charles Mix, Davison and 9 more57 min
Jul 9, 6:41 PM CDTMesoscale DiscussionSPCBrookings, Brown, Clark, Codington, Day, Deuel and 5 more3 hr

Nearby

Severe Thunderstorm Watches in South Dakota, 2013Severe Thunderstorm Watches in North Dakota, 2013Every severe thunderstorm watch in 2013

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.