Alert archive / Nebraska / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 578
The Storm Prediction Center issued this severe thunderstorm watch at Jun 30, 2011, 4:39 PM MDT for 15 counties in Nebraska; 5 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 30, 2011, 4:39 PM MDT (22:39 UTC)
- Expired
- Jun 30, 2011, 10:00 PM MDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Arthur County, NE, Brown County, NE, Cherry County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Jackson County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 97 km from the middle of the area, began a volume at 22:40 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
- 2%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 20%
- 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
- 70%
Warnings issued inside it
14 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 4:53 PM MDT | Severe Thunderstorm Warning | UNR | 37 min | |
| Jun 30, 5:14 PM MDT | Severe Thunderstorm Warning | LBF | Deuel, Garden | 61 min |
| Jun 30, 5:56 PM MDT | Severe Thunderstorm Warning | LBF | Arthur, Deuel, Garden, Keith | 64 min |
| Jun 30, 6:33 PM MDT | Severe Thunderstorm Warning | LBF | Sheridan | 57 min |
| Jun 30, 6:37 PM MDT | Flash Flood Warning | UNR | 3 hr | |
| Jun 30, 7:00 PM MDT | Severe Thunderstorm Warning | LBF | Cherry, Grant, Hooker | 60 min |
| Jun 30, 7:02 PM MDT | Severe Thunderstorm Warning | LBF | Arthur | 30 min |
| Jun 30, 7:30 PM MDT | Severe Thunderstorm Warning | LBF | Cherry | 60 min |
| Jun 30, 7:31 PM MDT | Severe Thunderstorm Warning | UNR | Bennett, Todd | 59 min |
| Jun 30, 8:11 PM MDT | Severe Thunderstorm Warning | LBF | Brown, Cherry, Keya Paha | 49 min |
| Jun 30, 8:14 PM MDT | Severe Thunderstorm Warning | UNR | Mellette, Todd, Tripp | 61 min |
| Jun 30, 8:46 PM MDT | Severe Thunderstorm Warning | UNR | Tripp | 29 min |
| Jun 30, 8:53 PM MDT | Severe Thunderstorm Warning | UNR | Mellette | 52 min |
| Jun 30, 9:09 PM MDT | Severe Thunderstorm Warning | UNR | Mellette, Tripp | 41 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, 10.7 hours before the alert went out and 134 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
- 843 J/kg
- Mixed-layer CIN
- -611 J/kg
- Mixed-layer LCL
- 2607 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 175 m²/s²
- 0-3 km storm-relative helicity
- 160 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 |
|---|---|---|---|---|
| Jun 30, 11:57 AM MDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Kimball, Morrill, Scotts Bluff and 1 more | 63 min |
| Jun 30, 12:18 PM MDT | Severe Thunderstorm Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 9 hr |
| Jun 30, 1:49 PM MDT | Mesoscale Discussion | SPC | Banner, Kimball, Scotts Bluff, Sioux | 116 min |
| Jun 30, 2:19 PM MDT | Mesoscale Discussion | SPC | Arthur, Cherry, Grant, Hooker, Keith, McPherson and 1 more | 56 min |
| Jun 30, 4:17 PM MDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 18 more | 118 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2011Severe Thunderstorm Watches in South Dakota, 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.