Alert archive / Nebraska / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 416
The Storm Prediction Center issued this severe thunderstorm watch at Jun 20, 2012, 12:57 AM CDT for 13 counties in Nebraska; 4 counties in South Dakota. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2012, 12:57 AM CDT (05:57 UTC)
- Expired
- Jun 20, 2012, 4:22 AM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Garden County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Bennett County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD
The radar
The North Platte radar (KLNX), 92 km from the middle of the area, began a volume at 05:58 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
- 5%
- 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
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 1:17 AM CDT | Severe Thunderstorm Warning | LBF | Cherry | 13 min |
| Jun 20, 1:18 AM CDT | Severe Thunderstorm Warning | UNR | Bennett, Todd | 57 min |
| Jun 20, 1:26 AM CDT | Severe Thunderstorm Warning | LBF | Cherry, Sheridan | 49 min |
| Jun 20, 1:31 AM CDT | Severe Thunderstorm Warning | LBF | Cherry | 29 min |
| Jun 20, 1:45 AM CDT | Severe Thunderstorm Warning | LBF | Garden | 30 min |
| Jun 20, 2:03 AM CDT | Severe Thunderstorm Warning | LBF | Cherry, Grant | 27 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 00:00Z, 6.0 hours before the alert went out and 182 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
- 2151 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 2585 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 1 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 19, 7:01 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Blaine, Boyd, Brown, Cedar, Custer and 15 more | 7 hr |
| Jun 19, 8:50 PM CDT | Mesoscale Discussion | SPC | Arthur, Box Butte, Cherry, Dawes, Garden, Grant and 7 more | 85 min |
| Jun 19, 11:59 PM CDT | Mesoscale Discussion | SPC | Box Butte, Dawes, Garden, Grant, Morrill, Sheridan | 91 min |
| Jun 20, 4:00 AM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Garden and 8 more | 60 min |
| Jun 20, 3:24 PM CDT | Mesoscale Discussion | SPC | Adams, Burt, Butler, Cass, Clay, Dodge and 21 more | 96 min |
| Jun 19, 9:12 PM CDT | Mesoscale Discussion | SPC | Brookings, Deuel, Grant, Hamlin, Kingsbury, Lake and 3 more | 93 min |
| Jun 19, 11:20 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Brookings, Brule, Buffalo, Charles Mix and 25 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Nebraska, 2012Severe Thunderstorm Watches in South Dakota, 2012Every severe thunderstorm watch in 2012
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.