Alert archive / South Dakota / Severe Thunderstorm Watches in 2014

Severe Thunderstorm Watch 291

June 13, 20149 counties in Montana; 14 counties in South Dakota; 4 counties in Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Jun 13, 2014, 2:09 PM MDT for 9 counties in Montana; 14 counties in South Dakota; 4 counties in Wyoming. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
Jun 13, 2014, 2:09 PM MDT (20:09 UTC)
Expired
Jun 13, 2014, 11:00 PM MDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 27 counties

Big Horn County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Musselshell County, MT, Powder River County, MT, Rosebud County, MT, Treasure County, MT, Yellowstone County, MT, Bennett County, SD, Butte County, SD, Custer County, SD, Fall River County, SD, Haakon County, SD, Harding County, SD, Jackson County, SD, Lawrence County, SD, Meade County, SD, Mellette County, SD, Pennington County, SD, Perkins County, SD, Todd County, SD, Ziebach County, SD, Campbell County, WY, Crook County, WY, Sheridan County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 209 km from the middle of the area, began a volume at 20:09 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
2%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 13, 2:30 PM MDTSevere Thunderstorm WarningUNRCampbell45 min
Jun 13, 2:42 PM MDTSevere Thunderstorm WarningBYZPowder River33 min
Jun 13, 3:12 PM MDTSevere Thunderstorm WarningUNRCampbell, Crook48 min
Jun 13, 3:15 PM MDTSevere Thunderstorm WarningBYZPowder River30 min
Jun 13, 3:58 PM MDTSevere Thunderstorm WarningUNRCrook47 min
Jun 13, 4:27 PM MDTTornado WarningUNRCrook48 min
Jun 13, 4:55 PM MDTSevere Thunderstorm WarningUNRCampbell35 min
Jun 13, 4:57 PM MDTSevere Thunderstorm WarningUNRCuster, Fall River48 min
Jun 13, 4:59 PM MDTTornado WarningUNRCrook28 min
Jun 13, 5:19 PM MDTSevere Thunderstorm WarningUNRButte38 min
Jun 13, 5:34 PM MDTSevere Thunderstorm WarningUNRButte23 min
Jun 13, 6:12 PM MDTSevere Thunderstorm WarningUNRMeade33 min
Jun 13, 6:43 PM MDTSevere Thunderstorm WarningUNRMeade47 min
Jun 13, 7:06 PM MDTSevere Thunderstorm WarningUNRMeade, Pennington54 min
Jun 13, 7:32 PM MDTSevere Thunderstorm WarningUNR58 min
Jun 13, 7:37 PM MDTSevere Thunderstorm WarningUNRHaakon, Ziebach53 min
Jun 13, 8:01 PM MDTSevere Thunderstorm WarningUNRPerkins, Ziebach46 min
Jun 13, 8:03 PM MDTTornado WarningUNR27 min
Jun 13, 8:06 PM MDTSevere Thunderstorm WarningUNRHaakon, Ziebach24 min
Jun 13, 8:28 PM MDTSevere Thunderstorm WarningUNRBennett62 min
Jun 13, 9:24 PM MDTSevere Thunderstorm WarningUNRBennett66 min
Jun 13, 10:07 PM MDTSevere Thunderstorm WarningUNRBennett, Jackson53 min
Jun 13, 10:41 PM MDTSevere Thunderstorm WarningUNRBennett, Jackson, Mellette, Todd64 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 12:00Z, 8.2 hours before the alert went out and 208 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 12:00Z on 2014-06-13Temperature 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, Rapid City, SD at 12:00Z on 2014-06-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1333 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
304 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
Jun 13, 2:17 AM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Fergus, Judith Basin, Meagher and 1 more88 min
Jun 13, 1:10 PM MDTMesoscale DiscussionSPCMusselshell, Prairie, Treasure2 hr
Jun 13, 1:46 PM MDTMesoscale DiscussionSPCCarter, Custer, Powder River89 min

Nearby

Severe Thunderstorm Watches in South Dakota, 2014Severe Thunderstorm Watches in Montana, 2014Severe Thunderstorm Watches in Wyoming, 2014Every severe thunderstorm watch in 2014

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.