Alert archive / Nebraska / Severe Thunderstorm Watches in 2015

Severe Thunderstorm Watch 15

April 1, 20154 states

The Storm Prediction Center issued this severe thunderstorm watch at Apr 1, 2015, 5:57 PM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Apr 1, 2015, 5:57 PM CDT (22:57 UTC)
Expired
Apr 2, 2015, 1:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 71 counties

Audubon County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Harrison County, IA, Ida County, IA, Monona County, IA, O'Brien County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Woodbury County, IA, Cloud County, KS, Jewell County, KS, Mitchell County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Smith County, KS, Washington County, KS, Adams County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Lancaster 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, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thayer County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Webster County, NE, York County, NE, Union County, SD

The radar

The Grand Island radar (KUEX), 81 km from the middle of the area, began a volume at 22:57 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
10%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 1, 6:15 PM CDTSevere Thunderstorm WarningGIDHoward, Sherman30 min
Apr 1, 6:15 PM CDTSevere Thunderstorm WarningOAXMadison, Pierce, Stanton, Wayne45 min
Apr 1, 6:27 PM CDTSevere Thunderstorm WarningGIDPhillips33 min
Apr 1, 6:30 PM CDTSevere Thunderstorm WarningFSDPlymouth33 min
Apr 1, 6:32 PM CDTSevere Thunderstorm WarningGIDBuffalo28 min
Apr 1, 6:36 PM CDTSevere Thunderstorm WarningGIDHoward24 min
Apr 1, 6:45 PM CDTSevere Thunderstorm WarningGIDBuffalo, Greeley, Hall, Howard, Nance, Sherman32 min
Apr 1, 6:54 PM CDTSevere Thunderstorm WarningGIDPhillips36 min
Apr 1, 7:25 PM CDTSevere Thunderstorm WarningGIDPhillips, Smith35 min
Apr 1, 7:46 PM CDTSevere Thunderstorm WarningGIDPhillips, Smith29 min
Apr 1, 7:54 PM CDTSevere Thunderstorm WarningGIDHamilton, Merrick, Nance36 min
Apr 1, 8:12 PM CDTSevere Thunderstorm WarningGIDAdams, Buffalo, Franklin, Hall, Kearney, Webster33 min
Apr 1, 8:31 PM CDTSevere Thunderstorm WarningGIDAdams, Clay, Hall, Hamilton, Polk29 min
Apr 1, 8:38 PM CDTSevere Thunderstorm WarningGIDAdams, Clay, Nuckolls, Webster22 min
Apr 1, 8:42 PM CDTSevere Thunderstorm WarningOAXColfax, Dodge, Saunders33 min
Apr 1, 8:56 PM CDTSevere Thunderstorm WarningGIDClay, Fillmore, Nuckolls, Thayer34 min
Apr 1, 8:59 PM CDTSevere Thunderstorm WarningGIDHamilton, Polk, York31 min
Apr 1, 9:09 PM CDTSevere Thunderstorm WarningGIDJewell36 min
Apr 1, 9:24 PM CDTSevere Thunderstorm WarningGIDFillmore, Thayer21 min
Apr 1, 9:26 PM CDTSevere Thunderstorm WarningGIDJewell34 min
Apr 1, 9:49 PM CDTSevere Thunderstorm WarningGIDYork13 min
Apr 1, 9:52 PM CDTSevere Thunderstorm WarningOAXSeward23 min
Apr 1, 10:35 PM CDTSevere Thunderstorm WarningGIDFillmore, Nuckolls, Thayer25 min
Apr 1, 10:36 PM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe24 min
Apr 1, 11:05 PM CDTSevere Thunderstorm WarningOAXCass, Otoe25 min
Apr 1, 11:19 PM CDTSevere Thunderstorm WarningOAXCass26 min
Apr 2, 12:08 AM CDTSevere Thunderstorm WarningTOPWashington33 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, 11.0 hours before the alert went out and 128 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 2015-04-01Temperature 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, Omaha, NE at 12:00Z on 2015-04-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2766 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
366 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
Apr 1, 3:50 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Crawford, Dickinson, Emmet and 12 more115 min
Apr 1, 12:39 PM CDTMesoscale DiscussionSPCCherokee, Crawford3 hr
Apr 1, 3:57 PM CDTMesoscale DiscussionSPCClark, Finney, Ford, Gove, Gray, Haskell and 5 more93 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2015Severe Thunderstorm Watches in Iowa, 2015Severe Thunderstorm Watches in Kansas, 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.