! 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 of
southern Iowa
northern Illinois
northern Missouri
Lake 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 60
statute miles north and south of a line from 30 miles west of
Lamoni Iowa to 50 miles east northeast of Marseilles Illinois.

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

Precautionary/preparedness actions...
Remember...a Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings. Severe thunderstorms can and occasionally
do produce tornadoes.

Discussion...vigorous thunderstorm development is expected to
persist along a warm frontal zone extending across the watch
area...into and through the afternoon hours. Severe hail is
probable in stronger cells. The evolution of an increasingly
organized cluster of storms is possible by this
afternoon...accompanied by an increasing risk for potentially
damaging wind gusts.

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

——————

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 central
Iowa...southeast Iowa and southwest Iowa...including the
following areas...in central Iowa...Jasper...Poweshiek and
Tama. In south central Iowa...Appanoose...Clarke...Decatur...
Lucas...Madison...Mahaska...Marion...Monroe...Ringgold...
Union...Warren and Wayne. In southeast Iowa...Davis and
Wapello. In southwest Iowa...Taylor.
* From noon CDT today through Thursday morning
* periods of showers and thunderstorms are anticipated through the
day and into tonight. The environment will be favorable for
these showers and storms to produce heavy rains as they reoccur
over similar areas. Rainfall totals may reach two to three
inches by early Thursday morning with locally higher amounts
possible in far southeast Iowa.
* Flash flooding of small streams and creeks may occur along with
significant ponding water on roads and in ditches. Larger rivers
south and east of Des Moines may also exceed flood stage beyond
the valid watch time into Thursday.
Precautionary/preparedness actions...
A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.
You should monitor later forecasts and be prepared to take action
should flash flood warnings be issued.

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