WXALERT: Thunderstorm Watch Until 9:00 PM

Untitled The Storm Prediction Center in Norman, OK has issued a Severe Thunderstorm Watch for much of southern Iowa until 9:00 PM Friday.  Storms developing in the vicinity of a low pressure along a cold front in Nebraska will push east into Iowa this afternoon.

The main threat from these storms is damaging winds, tornadoes and large hail also remain a threat.

Here is the raw text from the Storm Prediction Center:

HAIL TO 2 INCHES IN DIAMETER…THUNDERSTORM WIND GUSTS TO 80 MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH OF SHENANDOAH IOWA TO 15 MILES EAST NORTHEAST OF OTTUMWA IOWA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9). 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. OTHER WATCH INFORMATION…CONTINUE…WW 477WW 478… DISCUSSION…STORMS ARE GRADUALLY INCREASING FROM EXTREME NORTHEAST KS INTO SOUTHEAST NE…AND INTENSIFICATION OF ACTIVITY IS LIKELY THIS AFTERNOON IN RESPONSE TO UPPER SHORT WAVE TROUGH APPROACHING FROM THE WEST. ENVIRONMENT IS VERY UNSTABLE WITH MLCAPE TO 3000 J/KG…AND STRONG SWLY FLOW ALOFT IS RESULTING IN DEEP LAYER SHEAR OF 40-50 KT. THIS WILL PROMOTE DEVELOPMENT OF STORMS WITH SUPERCELL AND BOW ECHO STRUCTURES…WITH ACTIVITY EVENTUALLY DEVELOPING INTO A FORWARD-PROPAGATING MCS AS COLD POOLS MERGE AND GROW UPSCALE. PRIMARY THREAT EXPECTED TO BE DAMAGING WIND GUSTS ALTHOUGH LARGE HAIL AND AN ISOLATED TORNADO ARE ALSO POSSIBLE. AVIATION…A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 24035.

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