SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHWEST IOWA SOUTHWEST MINNESOTA CENTRAL AND NORTHEAST NEBRASKA SOUTHEAST SOUTH DAKOTA EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 705 PM UNTIL 200 AM CDT

     URGENT - IMMEDIATE BROADCAST REQUESTED     SEVERE THUNDERSTORM WATCH NUMBER 414     NWS STORM PREDICTION CENTER NORMAN OK     705 PM CDT TUE JUN 19 2012          THE NWS STORM PREDICTION CENTER HAS ISSUED A     SEVERE THUNDERSTORM WATCH FOR PORTIONS OF                  NORTHWEST IOWA            SOUTHWEST MINNESOTA            CENTRAL AND NORTHEAST NEBRASKA            SOUTHEAST SOUTH DAKOTA          EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 705 PM     UNTIL 200 AM CDT.          HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70     MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.          THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75     STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH     SOUTHWEST OF VALENTINE NEBRASKA TO 20 MILES EAST OF WORTHINGTON     MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE     ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).          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 412...WW 413...          DISCUSSION...ISOLATED STORMS HAVE INITIATED ALONG A COLD FRONT     SITUATED NE TO SW ACROSS NCNTRL NEB THIS EVENING. DESPITE WARM     ELEVATED MIXED LAYER ALOFT...THE COMBINATION OF DEEP BOUNDARY LAYER     HEATING AND MIXING AND FOCUSED LOW LEVEL CONVERGENCE ALONG THE FRONT     SHOULD CONTINUE TO SUPPORT TSTM INITIATION WITHIN A VERY UNSTABLE     AIR MASS ACROSS THE REGION. SHORT-TERM STORM-SCALE GUIDANCE SUGGESTS     THAT STORM COVERAGE SHOULD INCREASE ALONG AND IMMEDIATELY NORTH OF     THE FRONTAL BOUNDARY OVER THE NEXT FEW HOURS WITH GREATER     CONCENTRATION OF STORMS FROM NERN NEB INTO SD AND ADJACENT AREAS OF     NW IA AND SW MN. MODEST SHEAR ACROSS THESE AREAS...STRONGER ON THE     COOL SIDE OF THE FRONT...WILL SUPPORT UPDRAFT PERSISTENCE AND     ROTATION WITH A FEW HAIL/WIND EVENT LIKELY FROM A THE STRONGER     CORES. WITH TIME AND GREATER STORM COVERAGE...DAMAGING WIND     POTENTIAL MAY INCREASE AS A SMALL FORWARD PROPAGATING MCS DEVELOPS     ACROSS SERN SD INTO MN/NW IA. FARTHER SW ALONG THE BOUNDARY...MORE     ISOLATED STORMS WILL POSE DOWNBURST WIND AND HAIL THREATS. EVENING     RAOB FROM LBF IS CHARACTERISTIC OF DOWNBURST ENVIRONMENT AND ALSO     PRODUCES 1.75 INCH HAIL FROM THE SPC ANALOG SOUNDING HAIL MODEL.          AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT     TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60     KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM     MOTION VECTOR 25020. 

SORRY FOR THE DELAY ON GETTING THIS WATCH OUT.