Alert archive / Nebraska / Tornado Watches in 2009
Tornado Watch 452
The Storm Prediction Center issued this tornado watch at Jun 17, 2009, 9:04 PM CDT for 5 counties in Iowa; 39 counties in Nebraska. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 17, 2009, 9:04 PM CDT (02:04 UTC)
- Expired
- Jun 17, 2009, 11:36 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 60 kt
All 44 counties
Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Adams County, NE, Buffalo County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Dawson County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Gage County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Phelps County, NE, Polk County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Thayer County, NE, Valley County, NE, Webster County, NE, York County, NE
The radar
The Grand Island radar (KUEX), 93 km from the middle of the area, began a volume at 02:04 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
- 50%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 9:22 PM CDT | Tornado Warning | GID | Hamilton | 23 min |
| Jun 17, 9:29 PM CDT | Severe Thunderstorm Warning | GID | Hamilton, York | 35 min |
| Jun 17, 10:01 PM CDT | Severe Thunderstorm Warning | GID | York | 44 min |
| Jun 17, 10:10 PM CDT | Severe Thunderstorm Warning | OAX | Seward | 35 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
Omaha, NE (KOAX), launched 00:00Z, 2.1 hours before the alert went out and 118 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
- 1256 J/kg
- Mixed-layer CIN
- -128 J/kg
- Mixed-layer LCL
- 1892 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 54 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 7:01 PM CDT | Tornado Watch | SPC | Allamakee, Bremer, Butler, Cerro Gordo, Chickasaw, Clayton and 12 more | 5 hr |
| Jun 17, 8:04 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Cass, Fremont, Guthrie and 8 more | 56 min |
| Jun 17, 11:07 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Clayton, Fayette, Howard, Winneshiek | 53 min |
| Jun 17, 11:33 PM CDT | Mesoscale Discussion | SPC | Fremont, Mills, Pottawattamie | 87 min |
| Jun 17, 11:53 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Allamakee, Appanoose, Audubon, Benton, Black Hawk and 68 more | 6 hr |
| Jun 18, 1:01 AM CDT | Mesoscale Discussion | SPC | Appanoose, Davis, Decatur, Des Moines, Henry, Jefferson and 6 more | 89 min |
| Jun 18, 3:20 AM CDT | Mesoscale Discussion | SPC | Davis, Des Moines, Henry, Iowa, Jefferson, Johnson and 12 more | 85 min |
| Jun 18, 4:20 AM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Ida, Lyon and 5 more | 4 hr |
| Jun 18, 6:41 AM CDT | Mesoscale Discussion | SPC | Black Hawk, Boone, Bremer, Buchanan, Buena Vista, Butler and 31 more | 94 min |
| Jun 18, 7:04 AM CDT | Severe Thunderstorm Watch | SPC | Black Hawk, Bremer, Butler, Calhoun, Cerro Gordo, Chickasaw and 20 more | 4 hr |
| Jun 18, 9:42 AM CDT | Mesoscale Discussion | SPC | Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 8 more | 93 min |
| Jun 18, 10:11 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 11 more | 6 hr |
| Jun 18, 1:17 PM CDT | Mesoscale Discussion | SPC | Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 11 more | 88 min |
| Jun 18, 3:15 PM CDT | Mesoscale Discussion | SPC | Black Hawk, Boone, Bremer, Buena Vista, Butler, Calhoun and 25 more | 90 min |
| Jun 18, 6:52 PM CDT | Mesoscale Discussion | SPC | Lyon, Sioux | 113 min |
| Jun 17, 7:16 PM CDT | Tornado Watch | SPC | Benton, Camden, Crawford, Dent, Franklin, Iron and 19 more | 4 hr |
| Jun 17, 10:34 PM CDT | Mesoscale Discussion | SPC | Arthur, Banner, Chase, Cheyenne, Deuel, Garden and 12 more | 56 min |
| Jun 17, 11:01 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Cheyenne and 19 more | 6 hr |
| Jun 18, 1:46 AM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Cheyenne and 20 more | 89 min |
Nearby
Tornado Watches in Nebraska, 2009Tornado Watches in Iowa, 2009Every tornado watch in 2009
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.