Alert archive / Nebraska / Severe Thunderstorm Watches in 2012
Severe Thunderstorm Watch 158
The Storm Prediction Center issued this severe thunderstorm watch at Apr 12, 2012, 6:54 PM CDT for 18 counties in Nebraska. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 12, 2012, 6:54 PM CDT (23:54 UTC)
- Expired
- Apr 13, 2012, 1:03 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Blaine County, NE, Buffalo County, NE, Custer County, NE, Dawson County, NE, Franklin County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Harlan County, NE, Kearney County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Phelps County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE
The radar
The North Platte radar (KLNX), 84 km from the middle of the area, began a volume at 23:55 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
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 7:00 PM CDT | Severe Thunderstorm Warning | LBF | Hooker, McPherson, Thomas | 45 min |
| Apr 12, 7:30 PM CDT | Severe Thunderstorm Warning | LBF | Lincoln, Perkins | 45 min |
| Apr 12, 8:10 PM CDT | Severe Thunderstorm Warning | LBF | Lincoln | 50 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, 11.9 hours before the alert went out and 32 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 665 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 130 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 |
|---|---|---|---|---|
| Apr 12, 1:24 PM CDT | Mesoscale Discussion | SPC | Chase, Dundy, Hitchcock | 2 hr |
| Apr 12, 1:47 PM CDT | Tornado Watch | SPC | Chase, Dundy, Frontier, Hayes, Hitchcock, Perkins and 1 more | 7 hr |
| Apr 12, 5:02 PM CDT | Mesoscale Discussion | SPC | Arthur, Chase, Deuel, Dundy, Hayes, Hitchcock and 4 more | 88 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 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.