Alert archive / Nebraska / Severe Thunderstorm Watches in 2013

Severe Thunderstorm Watch 445

July 25, 20134 states

The Storm Prediction Center issued this severe thunderstorm watch at Jul 25, 2013, 5:18 PM CDT for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Jul 25, 2013, 5:18 PM CDT (22:18 UTC)
Expired
Jul 25, 2013, 9:29 PM CDT
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 64 counties

Buena Vista County, IA, Cherokee County, IA, Clay County, IA, Dickinson County, IA, Harrison County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Plymouth County, IA, Pottawattamie County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Jackson County, MN, Nobles County, MN, Rock County, MN, Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Kearney County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Sarpy County, NE, Saunders County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, York County, NE, Clay County, SD, Union County, SD

The radar

The Omaha radar (KOAX), 117 km from the middle of the area, began a volume at 22:18 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
30%
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
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 25, 6:21 PM CDTSevere Thunderstorm WarningFSDWoodbury39 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

Omaha, NE (KOAX), launched 12:00Z, 10.3 hours before the alert went out and 117 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, Omaha, NE at 12:00Z on 2013-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 304 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, Omaha, NE at 12:00Z on 2013-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 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
304 J/kg
Mixed-layer CIN
-131 J/kg
Mixed-layer LCL
1305 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
195 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 25, 12:41 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Hancock and 15 more3 hr
Jul 25, 1:39 PM CDTSevere Thunderstorm WatchSPCAllamakee, Audubon, Black Hawk, Boone, Bremer, Buena Vista and 42 more7 hr
Jul 25, 6:42 PM CDTMesoscale DiscussionSPCAllamakee, Audubon, Black Hawk, Boone, Bremer, Buena Vista and 41 more93 min
Jul 25, 3:24 PM CDTMesoscale DiscussionSPCBarton, Clark, Decatur, Edwards, Ellis, Finney and 35 more96 min
Jul 25, 4:43 PM CDTSevere Thunderstorm WatchSPCBarber, Barton, Clark, Comanche, Decatur, Edwards and 40 more8 hr
Jul 25, 6:43 PM CDTMesoscale DiscussionSPCBarber, Barton, Butler, Clark, Comanche, Cowley and 24 more92 min
Jul 25, 4:51 PM CDTMesoscale DiscussionSPCAitkin, Anoka, Benton, Carlton, Carver, Cass and 26 more2 hr
Jul 25, 5:54 PM CDTMesoscale DiscussionSPCAitkin, Anoka, Benton, Carlton, Chisago, Hennepin and 7 more2 hr
Jul 24, 7:43 PM CDTMesoscale DiscussionSPCCherry, Dawes, Sheridan92 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2013Severe Thunderstorm Watches in Iowa, 2013Severe Thunderstorm Watches in Minnesota, 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.