Full Notification

Thunderstorms are expected across the area tonight with the potential to produce heavy to very heavy rainfall.

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...Portions of central, northeast, south central, southeast, 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 northeast Iowa, Black Hawk. In south central Iowa, Clarke, Lucas, Madison, Mahaska, Marion, Monroe and Warren. In southeast Iowa, Davis and Wapello. In southwest Iowa, Adair and Cass. In west central Iowa, Audubon, Calhoun, Carroll, Crawford, Greene, Guthrie and Sac.

* WHEN...From 7 PM CDT this evening through Sunday morning.

* 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. Significant ponding may also occur.

* ADDITIONAL DETAILS... - Thunderstorms producing heavy to very heavy rainfall are possible tonight. Intense rainfall rates are likely with any storms producing 1 to 2 inches or rainfall over a short time period. Total rainfall amounts of 2 to 5 inches may occur in some areas with the potential to exceed 5 inches in a few areas.

* AFFECTED AREAS: SAC ... CALHOUN ... WEBSTER ... HAMILTON ... HARDIN ... GRUNDY ... BLACK HAWK ... CRAWFORD ... CARROLL ... GREENE ... BOONE ... STORY ... MARSHALL ... TAMA ... AUDUBON ... GUTHRIE ... DALLAS ... POLK ... JASPER ... POWESHIEK ... CASS ... ADAIR ... MADISON ... WARREN ... MARION ... MAHASKA ... CLARKE ... LUCAS ... MONROE ... WAPELLO ... DAVIS

Instructions:

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