Alert archive / Nebraska / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 441

July 24, 20137 counties in Colorado; 36 counties in Nebraska; 4 counties in Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Jul 24, 2013, 1:43 PM MDT for 7 counties in Colorado; 36 counties in Nebraska; 4 counties in Wyoming. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 24, 2013, 1:43 PM MDT (19:43 UTC)
Expired
Jul 24, 2013, 9:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
65 kt
All 47 counties

Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Arthur County, NE, Banner County, NE, Blaine County, NE, Box Butte County, NE, Boyd County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Kimball County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Rock County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE, Wheeler County, NE, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 178 km from the middle of the area, began a volume at 19:42 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
30%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
50%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 24, 2:15 PM MDTSevere Thunderstorm WarningLBFHolt, Rock45 min
Jul 24, 2:16 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill44 min
Jul 24, 2:16 PM MDTSevere Thunderstorm WarningLBFSheridan44 min
Jul 24, 2:23 PM MDTSevere Thunderstorm WarningCYSSioux52 min
Jul 24, 2:36 PM MDTSevere Thunderstorm WarningLBFHolt39 min
Jul 24, 3:01 PM MDTSevere Thunderstorm WarningCYSMorrill44 min
Jul 24, 3:24 PM MDTSevere Thunderstorm WarningCYSLaramie, Platte66 min
Jul 24, 3:44 PM MDTSevere Thunderstorm WarningCYSMorrill46 min
Jul 24, 3:46 PM MDTSevere Thunderstorm WarningLBFGarfield, Holt44 min
Jul 24, 3:56 PM MDTSevere Thunderstorm WarningLBFGarden49 min
Jul 24, 4:37 PM MDTSevere Thunderstorm WarningCYSLaramie, Platte53 min
Jul 24, 4:39 PM MDTSevere Thunderstorm WarningLBFGarfield51 min
Jul 24, 5:13 PM MDTSevere Thunderstorm WarningBOUWeld32 min
Jul 24, 5:19 PM MDTFlash Flood WarningCYSLaramie, Platte3 hr
Jul 24, 5:24 PM MDTSevere Thunderstorm WarningCYSLaramie66 min
Jul 24, 6:09 PM MDTSevere Thunderstorm WarningLBFKeith, Perkins36 min
Jul 24, 7:36 PM MDTFlash Flood WarningCYSPlatte6 hr
Jul 24, 8:35 PM MDTFlash Flood WarningCYSLaramie, Platte3 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 7.7 hours before the alert went out and 148 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, Denver, CO at 12:00Z on 2013-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 429 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, Denver, CO at 12:00Z on 2013-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -10 square meters per square second.193958Sfc1 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
429 J/kg
Mixed-layer CIN
-353 J/kg
Mixed-layer LCL
1506 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
-10 m²/s²
0-3 km storm-relative helicity
49 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 24, 12:18 PM MDTMesoscale DiscussionSPCSedgwick87 min
Jul 24, 4:02 PM MDTMesoscale DiscussionSPCBent, Cheyenne, Crowley, Elbert, El Paso, Kiowa and 6 more118 min
Jul 24, 5:37 PM MDTMesoscale DiscussionSPCLogan, Morgan, Phillips, Sedgwick, Washington, Weld and 1 more83 min
Jul 23, 7:11 PM MDTMesoscale DiscussionSPCArthur, Deuel, Garden, Grant, Keith, Sheridan64 min
Jul 24, 3:54 PM MDTMesoscale DiscussionSPCAdams, Blaine, Boone, Buffalo, Butler, Clay and 38 more96 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2013Severe Thunderstorm Watches in Colorado, 2013Severe Thunderstorm Watches in Wyoming, 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.