Alert archive / Nebraska / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 538
The Storm Prediction Center issued this severe thunderstorm watch at Jul 18, 2007, 8:39 PM CDT for 6 counties in Iowa; 51 counties in Nebraska; 6 counties in South Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2007, 8:39 PM CDT (01:39 UTC)
- Expired
- Jul 19, 2007, 3:56 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 70 kt
All 63 counties
Buena Vista County, IA, Cherokee County, IA, Ida County, IA, Monona County, IA, Plymouth County, IA, Woodbury County, IA, Antelope County, NE, Arthur County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Cherry County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dawson County, NE, Deuel County, NE, Dixon County, NE, Dodge County, NE, Garden County, NE, Garfield County, NE, Grant County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Hooker County, NE, Howard 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, Merrick County, NE, Nance County, NE, Perkins County, NE, Pierce County, NE, Platte County, NE, Polk 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, York County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Gregory County, SD, Union County, SD, Yankton County, SD
The radar
The North Platte radar (KLNX), 119 km from the middle of the area, began a volume at 01:38 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
- 95%
- One or more gusts of 65 knots or more
- 50%
- Ten or more severe hail reports
- 90%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
25 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 8:49 PM CDT | Severe Thunderstorm Warning | LBF | Arthur, Keith | 41 min |
| Jul 18, 8:53 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 52 min |
| Jul 18, 8:57 PM CDT | Severe Thunderstorm Warning | FSD | Bon Homme | 33 min |
| Jul 18, 9:13 PM CDT | Severe Thunderstorm Warning | LBF | Holt | 34 min |
| Jul 18, 9:59 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 46 min |
| Jul 18, 10:07 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 38 min |
| Jul 18, 10:16 PM CDT | Severe Thunderstorm Warning | LBF | Lincoln | 59 min |
| Jul 18, 10:18 PM CDT | Severe Thunderstorm Warning | FSD | Dixon | 27 min |
| Jul 18, 10:30 PM CDT | Severe Thunderstorm Warning | FSD | Dakota | 45 min |
| Jul 18, 10:35 PM CDT | Tornado Warning | LBF | Lincoln | 40 min |
| Jul 18, 10:37 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 38 min |
| Jul 18, 10:41 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 34 min |
| Jul 18, 10:41 PM CDT | Severe Thunderstorm Warning | FSD | Dixon | 34 min |
| Jul 18, 10:53 PM CDT | Severe Thunderstorm Warning | LBF | McPherson | 37 min |
| Jul 18, 10:53 PM CDT | Severe Thunderstorm Warning | OAX | Wayne | 37 min |
| Jul 18, 10:55 PM CDT | Severe Thunderstorm Warning | OAX | Madison, Stanton | 50 min |
| Jul 18, 10:57 PM CDT | Severe Thunderstorm Warning | OAX | Thurston | 33 min |
| Jul 18, 11:00 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 45 min |
| Jul 18, 11:02 PM CDT | Severe Thunderstorm Warning | OAX | Cuming | 43 min |
| Jul 18, 11:05 PM CDT | Severe Thunderstorm Warning | OAX | Antelope | 40 min |
| Jul 18, 11:26 PM CDT | Severe Thunderstorm Warning | OAX | Burt | 49 min |
| Jul 18, 11:31 PM CDT | Severe Thunderstorm Warning | OAX | Thurston | 38 min |
| Jul 18, 11:36 PM CDT | Severe Thunderstorm Warning | OAX | Dodge | 39 min |
| Jul 19, 12:03 AM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 42 min |
| Jul 19, 12:26 AM CDT | Severe Thunderstorm Warning | LBF | Wheeler | 34 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, 1.7 hours before the alert went out and 164 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
- 3120 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 2085 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 1:01 PM CDT | Mesoscale Discussion | SPC | Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Custer and 15 more | 3 hr |
| Jul 18, 9:06 PM CDT | Mesoscale Discussion | SPC | Clinton, Des Moines, Henry, Lee, Louisa, Scott | 84 min |
| Jul 18, 10:23 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 60 more | 97 min |
| Jul 18, 10:39 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Audubon, Black Hawk, Boone, Calhoun, Carroll and 23 more | 5 hr |
| Jul 18, 11:07 PM CDT | Severe Thunderstorm Watch | SPC | Cedar, Clinton, Des Moines, Henry, Iowa, Jefferson and 8 more | 4 hr |
| Jul 19, 1:41 AM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Black Hawk, Boone, Calhoun, Carroll and 23 more | 94 min |
| Jul 18, 7:15 PM CDT | Mesoscale Discussion | SPC | Adams, Antelope, Arthur, Blaine, Boone, Box Butte and 45 more | 90 min |
Nearby
Severe Thunderstorm Watches in Nebraska, 2007Severe Thunderstorm Watches in Iowa, 2007Severe Thunderstorm Watches in South Dakota, 2007Every severe thunderstorm watch in 2007
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.