WXALERT: Tornado Watch in Effect for Northeast Iowa Until 1:00 AM

Untitled The Storm Prediction Center in Oklahoma has issued a tornado watch for areas north of highway 20 until 1:00 am.

Storms are beginning to develop in many parts of the state and several rounds of strong storms are possible.  Here is the latest from the Storm Prediction Center:

 

TORNADOES…HAIL TO 2.5 INCHES IN DIAMETER…THUNDERSTORM WIND GUSTS TO 70 MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST SOUTHWEST OF FAIRMONT MINNESOTA TO 25 MILES SOUTH OF LA CROSSE WISCONSIN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9). REMEMBER…A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND 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. OTHER WATCH INFORMATION…CONTINUE…WW 439WW 440WW 441WW 442WW 443WW 445WW 444WW 446WW 447WW 448… DISCUSSION…A VERY UNSTABLE ENVIRONMENT IS PRESENT ACROSS S/SE MN INTO NRN IA…ALONG AND S OF A SURFACE WARM FRONT AND WEAK SURFACE WAVE IN SRN MN. BOUNDARY LAYER DEWPOINTS IN THE 70S AND TEMPERATURES IN THE 80S ARE CONTRIBUTING TO MLCAPE VALUES OF 3000-4000 J/KG…AND EFFECTIVE BULK SHEAR OVER THIS AREA IS AOA 50 KTS. THE ENVIRONMENT STRONGLY FAVORS DISCRETE SUPERCELL DEVELOPMENT…WHILE THE RICH LOW-LEVEL MOISTURE AND 0-1 KM SRH AOA 200 M2/S2 WILL FAVOR TORNADIC SUPERCELLS. GIVEN THESE ENVIRONMENTAL CONDITIONS…AN ISOLATED STRONG TORNADO MAY OCCUR. OTHERWISE…VERY LARGE HAIL AND ISOLATED DAMAGING WINDS WILL BE POSSIBLE. AVIATION…TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 29025.

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