Alert archive / Iowa / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 443
The Storm Prediction Center issued this severe thunderstorm watch at Aug 11, 2016, 3:55 PM CDT for 57 counties in Iowa; 30 counties in Nebraska; Clay County, Union County, Yankton County, South Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2016, 3:55 PM CDT (20:55 UTC)
- Expired
- Aug 11, 2016, 11:00 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 90 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Black Hawk County, IA, Boone County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clarke County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Jasper County, IA, Kossuth County, IA, Lucas County, IA, Madison County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monona County, IA, Monroe County, IA, O'Brien County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Pottawattamie County, IA, Poweshiek County, IA, Ringgold County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Webster County, IA, Woodbury County, IA, Wright County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Clay County, SD, Union County, SD, Yankton County, SD
The radar
The Omaha radar (KOAX), 119 km from the middle of the area, began a volume at 20:57 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
- 10%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 4:27 PM CDT | Severe Thunderstorm Warning | OAX | Antelope, Boone, Madison, Pierce | 48 min |
| Aug 11, 5:19 PM CDT | Severe Thunderstorm Warning | OAX | Thurston, Wayne | 41 min |
| Aug 11, 5:37 PM CDT | Severe Thunderstorm Warning | FSD | Dakota, Dixon | 38 min |
| Aug 11, 5:42 PM CDT | Severe Thunderstorm Warning | OAX | Burt, Cuming, Thurston | 37 min |
| Aug 11, 5:56 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 49 min |
| Aug 11, 6:17 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 43 min |
| Aug 11, 6:35 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona, Shelby | 55 min |
| Aug 11, 6:37 PM CDT | Severe Thunderstorm Warning | FSD | Ida, Woodbury | 53 min |
| Aug 11, 6:52 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 53 min |
| Aug 11, 7:13 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Shelby | 62 min |
| Aug 11, 7:29 PM CDT | Severe Thunderstorm Warning | OAX | Jefferson, Saline | 31 min |
| Aug 11, 7:33 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Crawford, Guthrie | 42 min |
| Aug 11, 7:45 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Guthrie | 45 min |
| Aug 11, 7:54 PM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson, Lancaster, Saline | 36 min |
| Aug 11, 8:14 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Audubon, Boone, Dallas, Greene, Guthrie | 46 min |
| Aug 11, 8:20 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Adams, Audubon, Cass, Guthrie | 40 min |
| Aug 11, 8:37 PM CDT | Severe Thunderstorm Warning | OAX | Lancaster | 23 min |
| Aug 11, 8:39 PM CDT | Severe Thunderstorm Warning | DMX | Adair, Boone, Dallas, Guthrie, Madison, Polk and 2 more | 66 min |
| Aug 11, 9:20 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Lucas, Madison, Marion, Union, Warren | 40 min |
| Aug 11, 9:27 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Jasper, Marion, Marshall, Polk, Story and 1 more | 46 min |
| Aug 11, 9:39 PM CDT | Flash Flood Warning | OAX | Douglas, Sarpy, Saunders | 3 hr |
| Aug 11, 9:59 PM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Clarke, Jasper, Lucas, Mahaska, Marion and 3 more | 46 min |
| Aug 11, 10:02 PM CDT | Severe Thunderstorm Warning | OAX | Mills, Montgomery, Pottawattamie | 58 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 12:00Z, 8.9 hours before the alert went out and 119 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
- 847 J/kg
- Mixed-layer CIN
- -276 J/kg
- Mixed-layer LCL
- 1518 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 284 m²/s²
- 0-3 km storm-relative helicity
- 297 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 |
|---|---|---|---|---|
| Aug 11, 12:37 PM CDT | Mesoscale Discussion | SPC | Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 23 more | 2 hr |
| Aug 11, 3:26 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Boone, Buena Vista, Calhoun and 31 more | 2 hr |
| Aug 11, 6:17 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Benton, Black Hawk, Boone and 54 more | 58 min |
| Aug 11, 2:35 PM CDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Dawes, Garden, Kimball and 4 more | 2 hr |
| Aug 11, 5:31 PM CDT | Mesoscale Discussion | SPC | Blaine, Brown, Lincoln, Logan, Loup, McPherson and 2 more | 89 min |
| Aug 11, 5:56 PM CDT | Mesoscale Discussion | SPC | Box Butte, Cherry, Garden, Grant, Morrill, Sheridan | 94 min |
| Aug 11, 6:29 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Boyd, Brown, Cherry, Custer and 13 more | 7 hr |
| Aug 10, 8:00 PM CDT | Severe Thunderstorm Watch | SPC | Beadle, Brookings, Brown, Brule, Buffalo, Campbell and 25 more | 6 hr |
| Aug 10, 10:50 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Brookings, Brown, Brule, Buffalo and 18 more | 85 min |
Nearby
Severe Thunderstorm Watches in Iowa, 2016Severe Thunderstorm Watches in Nebraska, 2016Severe Thunderstorm Watches in South Dakota, 2016Every severe thunderstorm watch in 2016
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.