...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 AM CDT
FOR EASTERN CASS...SOUTHWESTERN GUTHRIE...SOUTHEASTERN AUDUBON AND
WESTERN ADAIR COUNTIES...

At 744 AM CDT, a severe thunderstorm was located 5 miles south of
Lake Anita State Park, or 13 miles east of Atlantic, moving east at
40 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
considerable tree damage. Wind damage is also likely to
mobile homes, roofs, and outbuildings.

Locations impacted include...
Atlantic, Greenfield, Anita, Adair, Fontanelle, Casey, Massena,
Cumberland, Bridgewater, Wiota, Lake Anita State Park, Greenfield
Municipal Airport, Nodaway Park, and Anita Municipal Airport.

This includes Interstate 80 between mile markers 55 and 87.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Des Moines .

This is a dangerous storm, capable of producing large hail driven by
severe winds! SEEK SHELTER NOW inside a sturdy structure and stay
away from windows! If you are caught outdoors, cover your head and
neck.

&&


TORNADO...POSSIBLE;
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE;
HAIL THREAT...RADAR INDICATED;
MAX HAIL SIZE...1.75 IN;
WIND THREAT...RADAR INDICATED;
MAX WIND GUST...70 MPH

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
275 IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON FOR THE FOLLOWING
AREAS

IN IOWA THIS WATCH INCLUDES 38 COUNTIES

IN CENTRAL IOWA

BOONE                 DALLAS                GRUNDY
HAMILTON              HARDIN                JASPER
MARSHALL              POLK                  POWESHIEK
STORY                 TAMA                  WEBSTER

IN NORTHEAST IOWA

BLACK HAWK

IN SOUTH CENTRAL IOWA

APPANOOSE             CLARKE                DECATUR
LUCAS                 MADISON               MAHASKA
MARION                MONROE                RINGGOLD
UNION                 WARREN                WAYNE

IN SOUTHEAST IOWA

DAVIS                 WAPELLO

IN SOUTHWEST IOWA

ADAIR                 ADAMS                 CASS
TAYLOR

IN WEST CENTRAL IOWA

AUDUBON               CALHOUN               CARROLL
CRAWFORD              GREENE                GUTHRIE
SAC

THIS INCLUDES THE CITIES OF ACKLEY, ADAIR, ADEL, ALBIA, ALLERTON,
AMES, ATLANTIC, AUDUBON, BAYARD, BEDFORD, BLOOMFIELD, BOONE,
CARLISLE, CARROLL, CASEY, CEDAR FALLS, CENTERVILLE, CHARITON,
CONRAD, CORNING, CORYDON, CRESTON, DENISON, DES MOINES, DIKE,
DYSART, EARLHAM, EARLY, ELDORA, EXIRA, FONTANELLE, FORT DODGE,
GLADBROOK, GREENFIELD, GRINNELL, GRUNDY CENTER, GUTHRIE CENTER,
HUMESTON, INDIANOLA, IOWA FALLS, JEFFERSON, KNOXVILLE, LAKE CITY,
LAKE VIEW, LAMONI, LENOX, LEON, MANSON, MARSHALLTOWN, MOUNT AYR,
NEW MARKET, NEWTON, NORWALK, ODEBOLT, OSCEOLA, OSKALOOSA,
OTTUMWA, PANORA, PELLA, PERRY, POMEROY, REINBECK, ROCKWELL CITY,
SAC CITY, SCHALLER, SEYMOUR, STUART, TAMA, TOLEDO, TRAER,
WALL LAKE, WATERLOO, WAUKEE, WEBSTER CITY, WELLSBURG,
AND WINTERSET.

* PRIMARY THREATS INCLUDE...

SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 75
MPH POSSIBLE.
ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE.
A TORNADO OR TWO POSSIBLE.

PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES                        :  20%
PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES       :  10%
PROB OF 10 OR MORE SEVERE WIND EVENTS              :  50%
PROB OF 1 OR MORE WIND EVENTS >= 75 MPH            :  50%
PROB OF 10 OR MORE SEVERE HAIL EVENTS              :  30%
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/                            :  E 50

...FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING...

* WHAT...Flash flooding caused by excessive rainfall continues to be
possible.

* WHERE...Portions of central, north central, northeast, northwest,
south central, southwest, and west central Iowa, including the
following counties, in central Iowa, Boone, Dallas, Grundy,
Hamilton, Hardin, Jasper, Marshall, Polk, Poweshiek, Story, Tama
and Webster. In north central Iowa, Butler, Cerro Gordo, Franklin,
Hancock, Humboldt, Kossuth, Winnebago, Worth and Wright. In
northeast Iowa, Black Hawk and Bremer. In northwest Iowa, Emmet,
Palo Alto and Pocahontas. In south central Iowa, Madison, Mahaska,
Marion and Warren. In southwest Iowa, Adair and Cass. In west
central Iowa, Audubon, Calhoun, Carroll, Crawford, Greene, Guthrie
and Sac.

* WHEN...Through this evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas.

* ADDITIONAL DETAILS...
- 3 to 5 inches of rain have already fallen over portions of
northern and north central Iowa. Slow moving storms with
efficient rainfall rates will continue through the early
morning hours, and could impact the morning commute.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

For the latest river and stream observations and forecasts refer to
weather.gov/desmoines/water.

&&

The National Weather Service in Des Moines has issued a

* Flash Flood Warning for...
Northwestern Adair County in southwestern Iowa...
Northern Cass County in southwestern Iowa...
Audubon County in west central Iowa...
Guthrie County in west central Iowa...

* Until 930 AM CDT Tuesday.

* At 326 AM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
2 and 3 inches of rain have fallen. Additional rainfall amounts of
1 to 2 inches are possible in the warned area. Flash flooding may
already be occurring or will begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
Audubon, Guthrie Center, Coon Rapids, Panora, Lake Panorama,
Exira, Adair, Elk Horn, Bayard, Casey, Kimballton, Bagley, Yale,
Brayton, Gray, Audubon County Airport and Springbrook State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Be aware of your surroundings and do not drive on flooded roads.

&&


FLASH FLOOD...RADAR AND GAUGE INDICATED