Alert archive / Nebraska / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 170

April 23, 20076 counties in Kansas; 23 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Apr 23, 2007, 9:53 PM CDT for 6 counties in Kansas; 23 counties in Nebraska. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Apr 23, 2007, 9:53 PM CDT (02:53 UTC)
Expired
Apr 24, 2007, 6:00 AM CDT
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 29 counties

Jewell County, KS, Mitchell County, KS, Osborne County, KS, Phillips County, KS, Rooks County, KS, Smith County, KS, Adams County, NE, Buffalo County, NE, Chase County, NE, Clay County, NE, Dawson County, NE, Deuel County, NE, Dundy County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Gosper County, NE, Hall County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Nuckolls County, NE, Perkins County, NE, Phelps County, NE, Red Willow County, NE, Webster County, NE

The radar

The North Platte radar (KLNX), 159 km from the middle of the area, began a volume at 02:55 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
10%
Ten or more severe wind reports
20%
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
40%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 23, 10:08 PM CDTSevere Thunderstorm WarningGIDPhillips52 min
Apr 23, 10:15 PM CDTSevere Thunderstorm WarningGLDDundy60 min
Apr 23, 10:18 PM CDTTornado WarningGLDDundy42 min
Apr 23, 10:56 PM CDTTornado WarningGLDDundy49 min
Apr 23, 11:03 PM CDTSevere Thunderstorm WarningGIDFurnas, Harlan27 min
Apr 23, 11:43 PM CDTSevere Thunderstorm WarningGIDHarlan, Phelps47 min
Apr 23, 11:43 PM CDTTornado WarningGLDDundy26 min
Apr 23, 11:58 PM CDTTornado WarningLBFChase32 min
Apr 24, 12:11 AM CDTSevere Thunderstorm WarningGLDHitchcock64 min
Apr 24, 12:28 AM CDTSevere Thunderstorm WarningLBFChase62 min
Apr 24, 12:39 AM CDTSevere Thunderstorm WarningGIDClay51 min
Apr 24, 12:52 AM CDTSevere Thunderstorm WarningGLDRed Willow53 min
Apr 24, 1:15 AM CDTSevere Thunderstorm WarningGLDHitchcock37 min
Apr 24, 1:39 AM CDTFlash Flood WarningGLDRed Willow3 hr
Apr 24, 2:01 AM CDTSevere Thunderstorm WarningLBFFrontier33 min
Apr 24, 2:02 AM CDTSevere Thunderstorm WarningLBFHayes43 min
Apr 24, 2:13 AM CDTSevere Thunderstorm WarningGIDFurnas32 min
Apr 24, 2:30 AM CDTFlash Flood WarningGIDPhelps6 hr
Apr 24, 4:36 AM CDTFlash Flood WarningGIDBuffalo6 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.9 hours before the alert went out and 68 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, N. Platte/Lee Bi, NE at 00:00Z on 2007-04-24Temperature 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, N. Platte/Lee Bi, NE at 00:00Z on 2007-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 square meters per square second.1939587897Sfc1 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
1952 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
288 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 8:54 PM CDTMesoscale DiscussionSPCBarber, Barton, Butler, Cheyenne, Clark, Comanche and 55 more2 hr
Apr 23, 10:41 PM CDTTornado WatchSPCCheyenne, Decatur, Graham, Norton, Rawlins, Sheridan and 2 more5 hr
Apr 24, 1:37 AM CDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Graham, Logan, Norton and 6 more83 min
Apr 24, 5:03 AM CDTMesoscale DiscussionSPCGraham, Jewell, Lincoln, Mitchell, Norton, Osborne and 3 more87 min
Apr 24, 10:04 AM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Cloud, Comanche, Edwards and 40 more116 min
Apr 24, 10:48 AM CDTTornado WatchSPCBarber, Barton, Butler, Chase, Chautauqua, Clay and 41 more10 hr
Apr 24, 2:03 PM CDTMesoscale DiscussionSPCAllen, Anderson, Atchison, Bourbon, Brown, Cherokee and 26 more87 min
Apr 24, 2:48 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Gove, Logan, Rawlins, Sheridan and 3 more117 min
Apr 24, 3:24 PM CDTTornado WatchSPCAllen, Anderson, Atchison, Bourbon, Brown, Cherokee and 24 more5 hr
Apr 24, 3:37 PM CDTMesoscale DiscussionSPCBarber, Barton, Butler, Chase, Chautauqua, Clay and 33 more83 min
Apr 24, 6:13 PM CDTMesoscale DiscussionSPCButler, Chase, Chautauqua, Clay, Cloud, Cowley and 17 more62 min
Apr 24, 1:35 PM CDTMesoscale DiscussionSPCAdams, Buffalo, Butler, Cass, Clay, Custer and 34 more55 min
Apr 24, 1:48 PM CDTSevere Thunderstorm WatchSPCAdams, Buffalo, Clay, Dawson, Fillmore, Franklin and 21 more5 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2007Severe Thunderstorm Watches in Kansas, 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.