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! Severe Thunderstorm, flash flood watch includes southcentral, southwest Iowa!

Published: Wednesday, April 17, 2013 10:07 a.m. CDT

The National Weather Service has issued a severe thunderstorm watch from 9:15 am to 5:00 p.m. CDT today.

The NWS Storm Prediction Center has issued a* Severe Thunderstorm Watch for portions ofsouthern Iowanorthern Illinoisnorthern MissouriLake Michigan* effective this Wednesday morning and afternoon from 915 am until 500 PM CDT.* Primary threats include... several large hail events with a few very large hail events to 2 inches in diameter possible several damaging wind gusts to 60 mph possibl

The Severe Thunderstorm Watch area is approximately along and 60statute miles north and south of a line from 30 miles west ofLamoni Iowa to 50 miles east northeast of Marseilles Illinois.

For a complete depiction of the watch see the associated watchoutline update \(wous64 kwns wou3\).

Precautionary/preparedness actions...Remember...a Severe Thunderstorm Watch means conditions arefavorable for severe thunderstorms in and close to the watcharea. Persons in these areas should be on the lookout forthreatening weather conditions and listen for later statementsand possible warnings. Severe thunderstorms can and occasionallydo produce tornadoes.

Discussion...vigorous thunderstorm development is expected topersist along a warm frontal zone extending across the watcharea...into and through the afternoon hours. Severe hail isprobable in stronger cells. The evolution of an increasinglyorganized cluster of storms is possible by thisafternoon...accompanied by an increasing risk for potentiallydamaging wind gusts.

Aviation...a few severe thunderstorms with hail surface and aloftto 2 inches. Extreme turbulence and surface wind gusts to 50knots. A few cumulonimbi with maximum tops to 500. Mean stormmotion vector 26040.

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The National Weather Service has issued a flash flood watch from noon CDT today through Thursday morning...The National Weather Service in Des Moines has issued a* Flash Flood Watch for portions of central Iowa...south centralIowa...southeast Iowa and southwest Iowa...including thefollowing areas...in central Iowa...Jasper...Poweshiek andTama. In south central Iowa...Appanoose...Clarke...Decatur...Lucas...Madison...Mahaska...Marion...Monroe...Ringgold...Union...Warren and Wayne. In southeast Iowa...Davis andWapello. In southwest Iowa...Taylor.* From noon CDT today through Thursday morning* periods of showers and thunderstorms are anticipated through theday and into tonight. The environment will be favorable forthese showers and storms to produce heavy rains as they reoccurover similar areas. Rainfall totals may reach two to threeinches by early Thursday morning with locally higher amountspossible in far southeast Iowa.* Flash flooding of small streams and creeks may occur along withsignificant ponding water on roads and in ditches. Larger riverssouth and east of Des Moines may also exceed flood stage beyondthe valid watch time into Thursday.Precautionary/preparedness actions...A Flash Flood Watch means that conditions may develop that leadto flash flooding. Flash flooding is a very dangerous situation.You should monitor later forecasts and be prepared to take actionshould flash flood warnings be issued.

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