Alert archive / Nebraska / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 520
The Storm Prediction Center issued this severe thunderstorm watch at Jun 19, 2011, 11:45 PM MDT for 6 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 19, 2011, 11:45 PM MDT (05:45 UTC)
- Expired
- Jun 20, 2011, 1:54 AM MDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Chase County, NE, Dundy County, NE, Frontier County, NE, Hayes County, NE, Hitchcock County, NE, Red Willow County, NE
The radar
The Goodland radar (KGLD), 112 km from the middle of the area, began a volume at 05:48 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 20%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 60%
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 |
|---|---|---|---|---|
| Jun 19, 11:48 PM MDT | Severe Thunderstorm Warning | LBF | Chase | 42 min |
| Jun 19, 11:57 PM MDT | Severe Thunderstorm Warning | LBF | Frontier | 24 min |
| Jun 20, 12:27 AM MDT | Severe Thunderstorm Warning | LBF | Chase, Hayes | 48 min |
The nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 5.8 hours before the alert went out and 106 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
- 1727 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1157 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 293 m²/s²
- Significant tornado parameter
- 2.2
- Supercell composite
- 17.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 7:24 PM MDT | Mesoscale Discussion | SPC | Adams, Blaine, Boone, Buffalo, Chase, Clay and 35 more | 96 min |
| Jun 19, 8:16 PM MDT | Mesoscale Discussion | SPC | Burt, Cass, Dodge, Douglas, Lancaster, Nemaha and 4 more | 59 min |
| Jun 19, 8:49 PM MDT | Tornado Watch | SPC | Adams, Antelope, Boone, Buffalo, Burt, Butler and 46 more | 6 hr |
| Jun 20, 2:27 AM MDT | Mesoscale Discussion | SPC | Burt, Butler, Cass, Colfax, Cuming, Dodge and 11 more | 33 min |
| Jun 20, 2:46 AM MDT | Severe Thunderstorm Watch | SPC | Burt, Butler, Cass, Colfax, Cuming, Dodge and 10 more | 5 hr |
| Jun 20, 7:05 AM MDT | Mesoscale Discussion | SPC | Furnas, Red Willow | 55 min |
| Jun 20, 7:38 AM MDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Dawson, Franklin, Frontier, Furnas and 8 more | 6 hr |
| Jun 20, 11:22 AM MDT | Mesoscale Discussion | SPC | Adams, Boone, Buffalo, Clay, Custer, Dawson and 17 more | 83 min |
| Jun 20, 12:00 PM MDT | Tornado Watch | SPC | Adams, Antelope, Boone, Buffalo, Butler, Clay and 34 more | 10 hr |
| Jun 20, 1:19 PM MDT | Mesoscale Discussion | SPC | Adams, Boone, Buffalo, Clay, Dawson, Franklin and 17 more | 86 min |
| Jun 20, 1:52 PM MDT | Mesoscale Discussion | SPC | Hayes, Hitchcock, Lincoln, Logan, Red Willow | 53 min |
| Jun 20, 2:08 PM MDT | Tornado Watch | SPC | Burt, Cass, Dodge, Douglas, Gage, Jefferson and 12 more | 7 hr |
| Jun 20, 2:59 PM MDT | Mesoscale Discussion | SPC | Adams, Antelope, Boone, Buffalo, Clay, Custer and 21 more | 61 min |
| Jun 20, 5:17 PM MDT | Mesoscale Discussion | SPC | Antelope, Boone, Buffalo, Burt, Butler, Cass and 51 more | 58 min |
| Jun 20, 5:53 PM MDT | Tornado Watch | SPC | Antelope, Boone, Boyd, Burt, Butler, Cass and 29 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Nebraska, 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.