Alert archive / Nebraska / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 783
The Storm Prediction Center issued this severe thunderstorm watch at Aug 17, 2011, 2:37 PM MDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 17, 2011, 2:37 PM MDT (20:37 UTC)
- Expired
- Aug 17, 2011, 8:58 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 45 counties
Cheyenne County, CO, Kit Carson County, CO, Lincoln 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, Logan County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Arthur County, NE, Blaine County, NE, Brown County, NE, Chase County, NE, Cherry 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, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Haakon County, SD, Jackson County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 106 km from the middle of the area, began a volume at 20:41 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
- 30%
- 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
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 4:14 PM MDT | Severe Thunderstorm Warning | LBF | Cherry | 61 min |
| Aug 17, 4:36 PM MDT | Severe Thunderstorm Warning | GLD | Kit Carson | 54 min |
| Aug 17, 4:42 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson | 63 min |
| Aug 17, 4:51 PM MDT | Tornado Warning | LBF | Cherry | 39 min |
| Aug 17, 4:59 PM MDT | Severe Thunderstorm Warning | UNR | Mellette, Todd, Tripp | 61 min |
| Aug 17, 5:11 PM MDT | Severe Thunderstorm Warning | UNR | Mellette, Todd | 64 min |
| Aug 17, 5:18 PM MDT | Severe Thunderstorm Warning | LBF | Cherry | 57 min |
| Aug 17, 5:21 PM MDT | Severe Thunderstorm Warning | UNR | Jackson, Mellette | 54 min |
| Aug 17, 5:40 PM MDT | Tornado Warning | LBF | Cherry | 35 min |
| Aug 17, 5:44 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson | 61 min |
| Aug 17, 6:06 PM MDT | Severe Thunderstorm Warning | UNR | Mellette, Todd, Tripp | 54 min |
| Aug 17, 6:07 PM MDT | Tornado Warning | LBF | Cherry, Hooker | 38 min |
| Aug 17, 6:11 PM MDT | Severe Thunderstorm Warning | UNR | Mellette | 49 min |
| Aug 17, 6:34 PM MDT | Tornado Warning | UNR | Todd, Tripp | 32 min |
| Aug 17, 6:36 PM MDT | Severe Thunderstorm Warning | LBF | Chase | 39 min |
| Aug 17, 6:44 PM MDT | Tornado Warning | LBF | Hooker | 46 min |
| Aug 17, 6:55 PM MDT | Severe Thunderstorm Warning | UNR | Mellette, Todd | 65 min |
| Aug 17, 7:01 PM MDT | Severe Thunderstorm Warning | UNR | Todd, Tripp | 59 min |
| Aug 17, 7:13 PM MDT | Severe Thunderstorm Warning | LBF | Hooker, McPherson | 62 min |
| Aug 17, 7:31 PM MDT | Severe Thunderstorm Warning | UNR | Todd, Tripp | 59 min |
| Aug 17, 7:58 PM MDT | Severe Thunderstorm Warning | UNR | Tripp | 44 min |
| Aug 17, 8:10 PM MDT | Tornado Warning | LBF | Brown, Cherry, Keya Paha | 35 min |
| Aug 17, 8:44 PM MDT | Tornado Warning | LBF | Brown, Keya Paha, Rock | 31 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, 8.6 hours before the alert went out and 127 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
- 434 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 696 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 2:00 PM MDT | Mesoscale Discussion | SPC | Logan, Phillips, Sedgwick, Washington, Yuma | 2 hr |
| Aug 17, 4:43 PM MDT | Mesoscale Discussion | SPC | Baca, Bent, Cheyenne, Crowley, El Paso, Kiowa and 11 more | 62 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.