Alert archive / Nebraska / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 746
The Storm Prediction Center issued this severe thunderstorm watch at Aug 8, 2011, 3:52 PM MDT for 6 counties in Colorado; 13 counties in Kansas; 25 counties in Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 8, 2011, 3:52 PM MDT (21:52 UTC)
- Expired
- Aug 8, 2011, 9:43 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 44 counties
Kit Carson County, CO, Logan County, CO, Phillips County, CO, Sedgwick County, CO, Washington 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, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Arthur County, NE, Box Butte County, NE, Chase County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Red Willow County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Thomas County, NE
The radar
The North Platte radar (KLNX), 166 km from the middle of the area, began a volume at 21:52 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
- 20%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 4:21 PM MDT | Severe Thunderstorm Warning | LBF | Keith | 39 min |
| Aug 8, 4:27 PM MDT | Severe Thunderstorm Warning | GLD | Cheyenne, Rawlins | 63 min |
| Aug 8, 4:41 PM MDT | Tornado Warning | GLD | Cheyenne, Rawlins | 49 min |
| Aug 8, 4:53 PM MDT | Severe Thunderstorm Warning | LBF | Keith, Lincoln, Perkins | 52 min |
| Aug 8, 5:07 PM MDT | Severe Thunderstorm Warning | GLD | Sherman, Thomas | 53 min |
| Aug 8, 5:08 PM MDT | Severe Thunderstorm Warning | LBF | Custer, Lincoln | 52 min |
| Aug 8, 5:31 PM MDT | Severe Thunderstorm Warning | LBF | Chase, Hayes, Lincoln, Perkins | 74 min |
| Aug 8, 5:46 PM MDT | Severe Thunderstorm Warning | LBF | Lincoln | 44 min |
| Aug 8, 5:49 PM MDT | Severe Thunderstorm Warning | GLD | Gove, Logan | 56 min |
| Aug 8, 5:52 PM MDT | Severe Thunderstorm Warning | GLD | Rawlins | 53 min |
| Aug 8, 5:58 PM MDT | Severe Thunderstorm Warning | GLD | Thomas | 19 min |
| Aug 8, 6:31 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips, Sedgwick | 43 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, 9.9 hours before the alert went out and 160 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.
- Mixed-layer CAPE
- 426 J/kg
- Mixed-layer CIN
- -479 J/kg
- Mixed-layer LCL
- 1363 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 5:27 PM MDT | Mesoscale Discussion | SPC | Kit Carson, Logan, Phillips, Sedgwick, Yuma | 2 hr |
| Aug 7, 6:13 PM MDT | Mesoscale Discussion | SPC | Barber, Clark, Comanche, Cowley, Edwards, Ford and 11 more | 3 hr |
| Aug 7, 6:49 PM MDT | Severe Thunderstorm Watch | SPC | Jewell, Mitchell, Osborne, Smith | 7 hr |
| Aug 7, 9:45 PM MDT | Mesoscale Discussion | SPC | Anderson, Clay, Cloud, Coffey, Dickinson, Douglas and 28 more | 2 hr |
| Aug 7, 10:08 PM MDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Brown, Chase, Clay, Cloud and 25 more | 5 hr |
| Aug 7, 11:46 PM MDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Cherokee, Coffey, Crawford and 7 more | 59 min |
| Aug 8, 12:09 AM MDT | Severe Thunderstorm Watch | SPC | Bourbon, Crawford, Linn, Miami | 3 hr |
| Aug 8, 5:44 PM MDT | Severe Thunderstorm Watch | SPC | Clark, Comanche, Edwards, Ellis, Finney, Ford and 18 more | 4 hr |
| Aug 7, 9:28 PM MDT | Mesoscale Discussion | SPC | Antelope, Boone, Burt, Butler, Cass, Cedar and 30 more | 2 hr |
| Aug 8, 1:41 AM MDT | Mesoscale Discussion | SPC | Adams, Buffalo, Butler, Cass, Clay, Fillmore and 23 more | 34 min |
| Aug 8, 2:09 PM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Box Butte, Custer, Dawes, Garden and 11 more | 66 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2011Severe Thunderstorm Watches in Kansas, 2011Severe Thunderstorm Watches in Colorado, 2011Every severe thunderstorm watch in 2011
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.