Alert archive / Nebraska / Tornado Watches in 2010
Tornado Watch 684
The Storm Prediction Center issued this tornado watch at Sep 22, 2010, 4:00 PM CDT for 38 counties in Nebraska; 10 counties in South Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 22, 2010, 4:00 PM CDT (21:00 UTC)
- Expired
- Sep 22, 2010, 11:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 48 counties
Antelope County, NE, Arthur County, NE, Blaine County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Chase County, NE, Cherry County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Dixon County, NE, Frontier County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Hayes County, NE, Holt County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Perkins County, NE, Pierce County, NE, Rock County, NE, Sherman County, NE, Stanton County, NE, Thomas County, NE, Thurston County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Gregory County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The North Platte radar (KLNX), 158 km from the middle of the area, began a volume at 20:59 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
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 60%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 6:57 PM CDT | Severe Thunderstorm Warning | LBF | Custer | 48 min |
| Sep 22, 7:01 PM CDT | Tornado Warning | LBF | Custer | 29 min |
| Sep 22, 7:37 PM CDT | Flash Flood Warning | LBF | Lincoln | 3 hr |
| Sep 22, 7:44 PM CDT | Flash Flood Warning | LBF | Custer | 3 hr |
| Sep 22, 7:44 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 46 min |
| Sep 22, 8:16 PM CDT | Flash Flood Warning | OAX | Knox | 6 hr |
| Sep 22, 9:41 PM CDT | Flash Flood Warning | OAX | Cedar, Knox | 6 hr |
| Sep 22, 10:43 PM CDT | Flash Flood Warning | FSD | Clay, Union, Yankton | 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
Omaha, NE (KOAX), launched 12:00Z, 9.0 hours before the alert went out and 229 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
- 1368 J/kg
- Mixed-layer CIN
- -132 J/kg
- Mixed-layer LCL
- 478 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 144 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 8:48 AM CDT | Mesoscale Discussion | SPC | Antelope, Boyd, Brown, Cedar, Dixon, Garfield and 9 more | 87 min |
| Sep 22, 11:12 AM CDT | Severe Thunderstorm Watch | SPC | Antelope, Cedar, Dakota, Dixon, Knox, Pierce and 2 more | 9 hr |
| Sep 22, 3:24 PM CDT | Mesoscale Discussion | SPC | Antelope, Arthur, Blaine, Boone, Brown, Cedar and 30 more | 96 min |
| Sep 22, 2:04 PM CDT | Mesoscale Discussion | SPC | Lake, Lincoln, Minnehaha, Moody, Union | 86 min |
| Sep 22, 5:36 PM CDT | Mesoscale Discussion | SPC | Brookings, Deuel, Hanson, Lake, McCook, Minnehaha and 1 more | 54 min |
Nearby
Tornado Watches in Nebraska, 2010Tornado Watches in South Dakota, 2010Every tornado watch in 2010
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.