Alert archive / Nebraska / Severe Thunderstorm Watches in 2009

Severe Thunderstorm Watch 613

July 22, 200910 counties in Colorado; 16 counties in Kansas; 34 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jul 22, 2009, 1:55 PM MDT for 10 counties in Colorado; 16 counties in Kansas; 34 counties in Nebraska. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jul 22, 2009, 1:55 PM MDT (19:55 UTC)
Expired
Jul 22, 2009, 9:00 PM MDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 60 counties

Cheyenne County, CO, Kit Carson County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Graham County, KS, Greeley County, KS, Logan County, KS, Norton County, KS, Phillips County, KS, Rawlins County, KS, Rooks County, KS, Sheridan County, KS, Sherman County, KS, Smith County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Adams County, NE, Buffalo County, NE, Chase County, NE, Clay County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Fillmore 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, Hayes County, NE, Hitchcock County, NE, Howard County, NE, Kearney County, NE, Keith County, NE, Lincoln County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Perkins County, NE, Phelps County, NE, Polk County, NE, Red Willow County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, York County, NE

The radar

The Goodland radar (KGLD), 86 km from the middle of the area, began a volume at 19:58 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
5%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
40%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jul 22, 1:59 PM MDTSevere Thunderstorm WarningGIDFranklin, Kearney, Phelps46 min
Jul 22, 2:10 PM MDTSevere Thunderstorm WarningGIDDawson50 min
Jul 22, 2:16 PM MDTSevere Thunderstorm WarningLBFChase, Perkins59 min
Jul 22, 2:34 PM MDTSevere Thunderstorm WarningLBFLincoln56 min
Jul 22, 2:49 PM MDTSevere Thunderstorm WarningLBFCuster, Lincoln, Logan56 min
Jul 22, 2:51 PM MDTSevere Thunderstorm WarningGIDDawson, Gosper39 min
Jul 22, 2:55 PM MDTSevere Thunderstorm WarningGIDGreeley50 min
Jul 22, 3:06 PM MDTSevere Thunderstorm WarningLBFChase54 min
Jul 22, 3:11 PM MDTSevere Thunderstorm WarningLBFFrontier, Lincoln64 min
Jul 22, 3:23 PM MDTSevere Thunderstorm WarningGIDDawson, Gosper37 min
Jul 22, 3:33 PM MDTSevere Thunderstorm WarningGIDFranklin, Harlan42 min
Jul 22, 3:36 PM MDTSevere Thunderstorm WarningGLDDundy54 min
Jul 22, 3:43 PM MDTSevere Thunderstorm WarningGIDGreeley47 min
Jul 22, 3:52 PM MDTSevere Thunderstorm WarningGIDGosper38 min
Jul 22, 4:10 PM MDTSevere Thunderstorm WarningLBFFrontier50 min
Jul 22, 4:14 PM MDTSevere Thunderstorm WarningGIDValley46 min
Jul 22, 4:19 PM MDTFlash Flood WarningLBFFrontier3 hr
Jul 22, 4:22 PM MDTSevere Thunderstorm WarningGLDYuma53 min
Jul 22, 4:22 PM MDTSevere Thunderstorm WarningGIDPolk, York28 min
Jul 22, 4:23 PM MDTSevere Thunderstorm WarningLBFLincoln, Logan, McPherson52 min
Jul 22, 4:24 PM MDTSevere Thunderstorm WarningGIDFurnas, Gosper51 min
Jul 22, 4:28 PM MDTSevere Thunderstorm WarningGIDGreeley47 min
Jul 22, 4:29 PM MDTSevere Thunderstorm WarningGLDCheyenne61 min
Jul 22, 4:33 PM MDTSevere Thunderstorm WarningLBFCuster27 min
Jul 22, 4:50 PM MDTSevere Thunderstorm WarningGIDFurnas25 min
Jul 22, 4:57 PM MDTSevere Thunderstorm WarningGIDSherman, Valley48 min
Jul 22, 5:06 PM MDTSevere Thunderstorm WarningGIDAdams39 min
Jul 22, 5:09 PM MDTSevere Thunderstorm WarningGIDFurnas51 min
Jul 22, 5:15 PM MDTSevere Thunderstorm WarningGLDNorton60 min
Jul 22, 5:17 PM MDTSevere Thunderstorm WarningGLDLogan, Wallace58 min
Jul 22, 5:29 PM MDTSevere Thunderstorm WarningGLDCheyenne61 min
Jul 22, 5:33 PM MDTFlash Flood WarningGLDLogan, Wallace3 hr
Jul 22, 5:36 PM MDTSevere Thunderstorm WarningGIDAdams, Clay23 min
Jul 22, 6:03 PM MDTSevere Thunderstorm WarningBOUWeld42 min
Jul 22, 6:04 PM MDTSevere Thunderstorm WarningGLDSherman, Thomas56 min
Jul 22, 6:11 PM MDTSevere Thunderstorm WarningGLDGraham, Norton42 min
Jul 22, 6:23 PM MDTFlash Flood WarningGLDCheyenne2 hr
Jul 22, 6:29 PM MDTSevere Thunderstorm WarningGIDPhillips, Rooks46 min
Jul 22, 6:40 PM MDTSevere Thunderstorm WarningGLDWichita30 min
Jul 22, 6:44 PM MDTSevere Thunderstorm WarningGLDCheyenne, Kit Carson61 min
Jul 22, 6:48 PM MDTSevere Thunderstorm WarningGLDGraham, Sheridan57 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.9 hours before the alert went out and 143 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 12:00Z on 2009-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 78 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, N. Platte/Lee Bi, NE at 12:00Z on 2009-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 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
78 J/kg
Mixed-layer CIN
-187 J/kg
Mixed-layer LCL
1482 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 22, 1:16 PM MDTMesoscale DiscussionSPCBoulder, Broomfield, Clear Creek, Denver, Douglas, Gilpin and 13 more89 min
Jul 22, 5:47 PM MDTMesoscale DiscussionSPCCheyenne, Kit Carson, Lincoln, Logan, Morgan, Phillips and 4 more88 min

Nearby

Severe Thunderstorm Watches in Nebraska, 2009Severe Thunderstorm Watches in Kansas, 2009Severe Thunderstorm Watches in Colorado, 2009Every severe thunderstorm watch in 2009

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.