Alert archive / Nebraska / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 548
The Storm Prediction Center issued this severe thunderstorm watch at Jun 24, 2011, 5:46 PM MDT for 17 counties in Nebraska; 14 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 2011, 5:46 PM MDT (23:46 UTC)
- Expired
- Jun 24, 2011, 11:18 PM MDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 31 counties
Arthur County, NE, Blaine County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Corson County, SD, Dewey County, SD, Haakon County, SD, Hughes County, SD, Jackson County, SD, Jones County, SD, Lyman County, SD, Mellette County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD, Ziebach County, SD
The radar
The Rapid City radar (KUDX), 76 km from the middle of the area, began a volume at 23:48 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
- 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
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 5:55 PM MDT | Severe Thunderstorm Warning | LBF | Sheridan | 50 min |
| Jun 24, 6:54 PM MDT | Severe Thunderstorm Warning | LBF | Cherry | 51 min |
| Jun 24, 6:54 PM MDT | Severe Thunderstorm Warning | UNR | Butte, Harding, Meade, Perkins, Ziebach | 96 min |
| Jun 24, 7:13 PM MDT | Severe Thunderstorm Warning | LBF | Cherry, Garden, Grant, Hooker, Sheridan | 47 min |
| Jun 24, 7:32 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson, Meade, Pennington, Ziebach | 88 min |
| Jun 24, 7:37 PM MDT | Severe Thunderstorm Warning | LBF | Cherry | 38 min |
| Jun 24, 7:53 PM MDT | Severe Thunderstorm Warning | LBF | Cherry, Grant, Hooker | 52 min |
| Jun 24, 8:05 PM MDT | Severe Thunderstorm Warning | UNR | Custer, Jackson, Pennington | 24 min |
| Jun 24, 8:06 PM MDT | Severe Thunderstorm Warning | LBF | Arthur, Garden, Keith | 39 min |
| Jun 24, 8:06 PM MDT | Severe Thunderstorm Warning | LBF | Brown, Cherry, Keya Paha | 39 min |
| Jun 24, 8:40 PM MDT | Severe Thunderstorm Warning | LBF | Arthur, Keith | 50 min |
| Jun 24, 8:54 PM MDT | Severe Thunderstorm Warning | UNR | Haakon, Jackson, Mellette | 66 min |
| Jun 24, 9:14 PM MDT | Severe Thunderstorm Warning | ABR | Jones | 61 min |
| Jun 24, 9:42 PM MDT | Severe Thunderstorm Warning | ABR | Jones, Lyman | 45 min |
| Jun 24, 10:25 PM MDT | Flash Flood Warning | ABR | Hughes, Stanley | 3 hr |
| Jun 24, 10:53 PM MDT | Flash Flood Warning | UNR | Haakon, Jackson, Mellette | 6 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
Rapid City, SD (KUNR), launched 12:00Z, 11.8 hours before the alert went out and 81 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
- 552 J/kg
- Mixed-layer CIN
- -226 J/kg
- Mixed-layer LCL
- 1198 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 1:25 PM MDT | Mesoscale Discussion | SPC | Banner, Kimball, Scotts Bluff, Sioux | 65 min |
| Jun 24, 1:52 PM MDT | Severe Thunderstorm Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more | 7 hr |
| Jun 24, 4:57 PM MDT | Mesoscale Discussion | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Custer and 16 more | 2 hr |
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.