Alert archive / Nebraska / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 248

June 2, 201512 counties in Nebraska; 9 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 2, 2015, 2:44 PM MDT for 12 counties in Nebraska; 9 counties in South Dakota. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 2, 2015, 2:44 PM MDT (20:44 UTC)
Expired
Jun 2, 2015, 10:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 21 counties

Arthur County, NE, Banner County, NE, Box Butte County, NE, Cherry County, NE, Dawes County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett 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

The radar

The Rapid City radar (KUDX), 179 km from the middle of the area, began a volume at 20:44 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
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 2, 3:56 PM MDTSevere Thunderstorm WarningCYSDawes, Sioux47 min
Jun 2, 4:17 PM MDTSevere Thunderstorm WarningUNRPennington28 min
Jun 2, 4:36 PM MDTSevere Thunderstorm WarningCYSBox Butte, Dawes, Sioux54 min
Jun 2, 4:41 PM MDTSevere Thunderstorm WarningUNRPennington24 min
Jun 2, 4:51 PM MDTSevere Thunderstorm WarningUNRCuster, Fall River54 min
Jun 2, 5:26 PM MDTSevere Thunderstorm WarningLBFSheridan49 min
Jun 2, 5:35 PM MDTSevere Thunderstorm WarningCYSBox Butte, Dawes31 min
Jun 2, 5:42 PM MDTFlash Flood WarningCYSBox Butte, Dawes5 hr
Jun 2, 5:45 PM MDTSevere Thunderstorm WarningLBFCherry35 min
Jun 2, 6:00 PM MDTSevere Thunderstorm WarningLBFSheridan45 min
Jun 2, 6:23 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill, Scotts Bluff28 min
Jun 2, 6:58 PM MDTSevere Thunderstorm WarningUNRTodd17 min
Jun 2, 7:01 PM MDTSevere Thunderstorm WarningUNRBennett, Jackson28 min
Jun 2, 7:19 PM MDTSevere Thunderstorm WarningCYSCheyenne, Morrill45 min
Jun 2, 7:22 PM MDTSevere Thunderstorm WarningLBFCherry, Grant38 min
Jun 2, 7:46 PM MDTSevere Thunderstorm WarningCYSMorrill59 min
Jun 2, 7:52 PM MDTSevere Thunderstorm WarningLBFCherry38 min
Jun 2, 7:56 PM MDTSevere Thunderstorm WarningLBFGrant, Hooker49 min
Jun 2, 8:10 PM MDTSevere Thunderstorm WarningUNRTodd35 min
Jun 2, 8:40 PM MDTSevere Thunderstorm WarningLBFArthur, Grant, Hooker, McPherson31 min
Jun 2, 8:55 PM MDTSevere Thunderstorm WarningUNRLawrence, Pennington35 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, 8.7 hours before the alert went out and 173 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 2015-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 95 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 12:00Z on 2015-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 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
95 J/kg
Mixed-layer CIN
-540 J/kg
Mixed-layer LCL
1851 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
151 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 2, 12:37 PM MDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 7 more53 min
Jun 2, 5:27 PM MDTMesoscale DiscussionSPCArthur, Box Butte, Brown, Cherry, Dawes, Garden and 8 more2 hr
Jun 2, 1:28 PM MDTMesoscale DiscussionSPCCampbell, McPherson92 min
Jun 2, 1:46 PM MDTTornado WatchSPCCampbell, Corson, McPherson7 hr
Jun 2, 5:22 PM MDTMesoscale DiscussionSPCCampbell, McPherson113 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2015Severe Thunderstorm Watches in South Dakota, 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.