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Iowa, Sac

Severe Thunderstorm Watch

Statement as of 4:51 PM CDT on August 18, 2017

Expires 2:00 AM EDT on August 19, 2017



The National Weather Service has issued Severe Thunderstorm Watch
456 in effect until 1 am CDT Saturday for the following areas

In Iowa this watch includes 35 counties

In central Iowa

Boone Dallas Grundy
Hamilton Hardin Jasper
Marshall Polk Poweshiek
story Tama Webster

In north central Iowa

Butler Cerro Gordo Franklin
Hancock Humboldt Kossuth
Winnebago Worth Wright

In northwest Iowa

Emmet Palo Alto Pocahontas

In south central Iowa

Madison Mahaska Marion
Warren

In southwest Iowa

Adair

In west central Iowa

Audubon Calhoun Carroll
Greene Guthrie SAC

This includes the cities of Ackley, Adair, Adel, Algona, Allison,
Ames, Aplington, Audubon, Bayard, Belmond, Boone, Britt,
Carlisle, Carroll, Casey, Clarion, Clarksville, Clear Lake,
Conrad, Des Moines, dike, Dumont, Dysart, Eagle Grove, Earlham,
early, Eldora, Emmetsburg, Estherville, Exira, Fonda, Fontanelle,
Forest City, Fort Dodge, Garner, Gilmore City, Gladbrook, Greene,
Greenfield, Grinnell, Grundy Center, Guthrie Center, Hampton,
Humboldt, Indianola, Iowa Falls, Jefferson, Kanawha, Knoxville,
Lake City, Lake Mills, Lake view, Laurens, Manly, Manson,
Marshalltown, Mason City, Newton, Northwood, Norwalk, Odebolt,
Oskaloosa, Panora, Parkersburg, Pella, Perry, Pocahontas,
Pomeroy, Reinbeck, Rockwell City, Rolfe, SAC City, Schaller,
Shell Rock, Stuart, Tama, Toledo, traer, Wall Lake, Waukee,
Webster City, Wellsburg, and Winterset.

* Primary threats include...

isolated damaging wind gusts to 70 mph possible.
Isolated large hail events to 1.5 inches in diameter possible.

Probability table:
prob of 2 or more tornadoes : 10%
prob of 1 or more strong /F2-F5/ tornadoes : 10%
prob of 10 or more severe wind events : 30%
prob of 1 or more wind events >= 75 mph : 10%
prob of 10 or more severe hail events : 20%
prob of 1 or more hail events >= 2 inches : 10%
prob of 6 or more combined severe hail/wind events : 70%
mean storm motion /mph/ : se 40


Ansorge


Weather Severe Map
Alabama - Areal Flood Advisory , Special Statement
Alaska - Areal Flood Advisory , High Surf Advisory , Record Report
Arizona - Air Quality Alert
Arkansas - Severe Thunderstorm Warning , Flood Warning , Heat Advisory , Special Statement , Record Report
California - Fire Weather Watch , Beach Hazard Statement , Special Statement , Record Report
Colorado -
Connecticut - Severe Thunderstorm Watch , Flash Flood Watch , Special Statement , Public Information Statement
Delaware - Severe Thunderstorm Watch , Severe Thunderstorm Warning , Flash Flood Watch , Areal Flood Advisory, Flash Flood Watch
District of Columbia - Severe Thunderstorm Watch , Flash Flood Watch , Heat Advisory
Florida - Areal Flood Advisory , Coastal Hazard Statement , Special Statement , Record Report , Public Information Statement , Public Information Statement
Georgia - Record Report
Hawaii - Special Statement , Record Report
Idaho - Fire Weather Warning
Illinois - Public Information Statement
Indiana - Air Quality Alert , Record Report
Iowa - Severe Thunderstorm Watch , Public Information Statement
Kansas - Flash Flood Warning
Louisiana - Flood Warning , Heat Advisory , Record Report
Maine - Areal Flood Advisory
Maryland - Severe Thunderstorm Watch , Severe Thunderstorm Warning , Flash Flood Warning , Flash Flood Watch, Coastal Flood Advisory , Areal Flood Advisory, Flash Flood Watch , Flash Flood Watch , Coastal Flood Advisory , Heat Advisory
Massachusetts - Severe Thunderstorm Watch , Public Information Statement
Michigan - Beach Hazard Statement , Record Report , Public Information Statement , Public Information Statement
Minnesota - Severe Thunderstorm Watch , Severe Thunderstorm Warning , Special Statement , Public Information Statement
Mississippi - Flood Warning , Heat Advisory , Special Statement
Missouri - Flash Flood Warning , Public Information Statement
Montana - Fire Weather Warning , Air Quality Alert
Nebraska - Flood Warning
Nevada -
New Hampshire - Areal Flood Advisory
New Jersey - Severe Thunderstorm Watch , Severe Thunderstorm Warning , Areal Flood Advisory, Flash Flood Watch , Flash Flood Watch , Special Statement , Public Information Statement
New Mexico - Flash Flood Watch
New York - Severe Thunderstorm Watch , Severe Thunderstorm Warning , Flash Flood Watch , Areal Flood Advisory , Special Statement , Beach Hazard Statement , Public Information Statement
North Carolina - Coastal Flood Advisory , Heat Advisory , Special Statement , Record Report , Public Information Statement
North Dakota - Fire Weather Watch
Ohio - Beach Hazard Statement , Public Information Statement , Public Information Statement
Oklahoma - Severe Thunderstorm Warning , Flood Warning , Special Statement
Oregon - Fire Weather Warning , Fire Weather Watch , Air Quality Alert
Pennsylvania - Severe Thunderstorm Watch , Severe Thunderstorm Warning , Areal Flood Advisory, Flash Flood Watch , Flash Flood Watch , Beach Hazard Statement
Puerto Rico - Coastal Hazard Statement
South Carolina - Heat Advisory
South Dakota - Severe Thunderstorm Warning , Special Statement
Tennessee - Public Information Statement , Public Information Statement
Texas - Flood Warning , Flash Flood Watch , Areal Flood Advisory , Heat Advisory , Special Statement , Record Report
Vermont - Public Information Statement
Virgin Islands - Coastal Hazard Statement
Virginia - Severe Thunderstorm Watch , Flash Flood Watch , Heat Advisory , Special Statement
Washington - Fire Weather Warning
West Virginia - Severe Thunderstorm Watch
Wisconsin - Public Information Statement
- Severe Thunderstorm Watch
- Small Craft Advisory

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