Alert archive / South Dakota / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 347

June 23, 201510 counties in South Dakota; Crook County, Weston County, Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Jun 23, 2015, 11:50 PM MDT for 10 counties in South Dakota; Crook County, Weston County, Wyoming. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jun 23, 2015, 11:50 PM MDT (05:50 UTC)
Expired
Jun 24, 2015, 5:00 AM MDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt

Counties Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Todd County, SD, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 82 km from the middle of the area, began a volume at 05:53 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
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 24, 12:01 AM MDTSevere Thunderstorm WarningUNRCampbell, Crook, Weston59 min
Jun 24, 12:26 AM MDTSevere Thunderstorm WarningUNRPennington49 min
Jun 24, 12:28 AM MDTSevere Thunderstorm WarningUNRCrook47 min
Jun 24, 12:37 AM MDTSevere Thunderstorm WarningUNRPennington53 min
Jun 24, 12:58 AM MDTSevere Thunderstorm WarningUNRCampbell, Crook, Weston62 min
Jun 24, 1:00 AM MDTSevere Thunderstorm WarningUNRLawrence, Meade60 min
Jun 24, 1:28 AM MDTSevere Thunderstorm WarningUNRMeade, Pennington43 min
Jun 24, 1:53 AM MDTSevere Thunderstorm WarningUNRPennington52 min
Jun 24, 2:01 AM MDTSevere Thunderstorm WarningUNRCuster, Pennington59 min
Jun 24, 2:32 AM MDTSevere Thunderstorm WarningUNRPennington43 min
Jun 24, 2:37 AM MDTSevere Thunderstorm WarningUNRBennett, Fall River68 min
Jun 24, 3:02 AM MDTSevere Thunderstorm WarningUNRCuster, Fall River58 min
Jun 24, 3:56 AM MDTSevere Thunderstorm WarningUNRFall River64 min
Jun 24, 4:43 AM MDTSevere Thunderstorm WarningUNR46 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

Rapid City, SD (KRAP), launched 00:00Z, 5.8 hours before the alert went out and 79 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, Rapid City, SD at 00:00Z on 2015-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 79 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, Rapid City, SD at 00:00Z on 2015-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 67 square meters per square second.1939587897Sfc1 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
79 J/kg
Mixed-layer CIN
-232 J/kg
Mixed-layer LCL
1623 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
67 m²/s²
0-3 km storm-relative helicity
73 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
Jun 23, 11:55 PM MDTMesoscale DiscussionSPCButte, Custer, Fall River, Lawrence, Meade, Oglala Lakota and 1 more35 min
Jun 24, 2:23 AM MDTMesoscale DiscussionSPCBennett, Butte, Custer, Fall River, Haakon, Jackson and 4 more97 min
Jun 24, 4:19 AM MDTMesoscale DiscussionSPCBennett, Custer, Fall River, Jackson, Mellette, Oglala Lakota and 2 more56 min
Jun 24, 12:27 PM MDTMesoscale DiscussionSPCButte, Custer, Fall River, Lawrence, Meade, Oglala Lakota and 3 more2 hr
Jun 24, 2:34 PM MDTMesoscale DiscussionSPCLaramie86 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2015Severe Thunderstorm Watches in Wyoming, 2015Every severe thunderstorm watch in 2015

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.