Alert archive / Nebraska / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 105

April 2, 200738 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Apr 2, 2007, 8:25 PM CDT for 38 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 2, 2007, 8:25 PM CDT (01:25 UTC)
Expired
Apr 3, 2007, 1:55 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
70 kt
All 38 counties

Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dawson County, NE, Dodge County, NE, Fillmore County, NE, Franklin County, NE, Gage County, NE, Greeley County, NE, Hall County, NE, Hamilton 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, Platte County, NE, Polk County, NE, Saline County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Valley County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 126 km from the middle of the area, began a volume at 01:27 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
5%
Ten or more severe wind reports
95%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 2, 8:27 PM CDTSevere Thunderstorm WarningGIDDawson63 min
Apr 2, 9:20 PM CDTSevere Thunderstorm WarningGIDSherman55 min
Apr 2, 9:24 PM CDTSevere Thunderstorm WarningGIDBuffalo, Dawson, Kearney, Phelps66 min
Apr 2, 10:02 PM CDTSevere Thunderstorm WarningGIDHall, Howard40 min
Apr 2, 10:28 PM CDTSevere Thunderstorm WarningGIDHall, Hamilton, Howard, Merrick38 min
Apr 2, 11:42 PM CDTSevere Thunderstorm WarningOAXPlatte33 min
Apr 2, 11:59 PM CDTSevere Thunderstorm WarningOAXSeward31 min
Apr 3, 12:06 AM CDTSevere Thunderstorm WarningOAXColfax24 min
Apr 3, 12:52 AM CDTSevere Thunderstorm WarningOAXGage38 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 00:00Z, 1.4 hours before the alert went out and 136 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 00:00Z on 2007-04-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 74 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 00:00Z on 2007-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 223 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
74 J/kg
Mixed-layer CIN
-377 J/kg
Mixed-layer LCL
1481 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
223 m²/s²
0-3 km storm-relative helicity
516 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 2, 8:05 PM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Benton, Black Hawk and 86 more115 min
Apr 2, 9:22 PM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 46 more8 hr
Apr 2, 11:33 PM CDTMesoscale DiscussionSPCBlack Hawk, Bremer, Buchanan, Butler, Calhoun, Clayton and 17 more57 min
Apr 2, 11:40 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Cass, Clarke, Decatur and 11 more65 min
Apr 3, 12:03 AM CDTSevere Thunderstorm WatchSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 24 more7 hr
Apr 3, 1:27 AM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Boone, Bremer, Buchanan and 49 more93 min
Apr 3, 2:22 AM CDTMesoscale DiscussionSPCAdair, Adams, Appanoose, Audubon, Cass, Clarke and 24 more53 min
Apr 3, 4:05 AM CDTMesoscale DiscussionSPCDes Moines, Henry, Jefferson, Keokuk, Lee, Louisa and 3 more55 min
Apr 3, 4:19 AM CDTSevere Thunderstorm WatchSPCCedar, Des Moines, Henry, Iowa, Jefferson, Johnson and 7 more6 hr
Apr 2, 7:52 PM CDTMesoscale DiscussionSPCAdams, Boone, Buffalo, Butler, Cass, Clay and 38 more83 min
Apr 2, 10:06 PM CDTMesoscale DiscussionSPCBoone, Butler, Cass, Colfax, Dodge, Douglas and 12 more54 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2007Every severe thunderstorm watch in 2007

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.