SEVERE THUNDERSTORM WATCH FOR PORTIONS OF NORTHEAST COLORADO NORTHWEST KANSAS SOUTHWEST NEBRASKA EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 715 PM UNTIL 100 AM CDT

   SEL8          URGENT - IMMEDIATE BROADCAST REQUESTED     SEVERE THUNDERSTORM WATCH NUMBER 398     NWS STORM PREDICTION CENTER NORMAN OK     715 PM CDT FRI JUN 15 2012          THE NWS STORM PREDICTION CENTER HAS ISSUED A     SEVERE THUNDERSTORM WATCH FOR PORTIONS OF                  NORTHEAST COLORADO            NORTHWEST KANSAS            SOUTHWEST NEBRASKA          EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 715 PM     UNTIL 100 AM CDT.          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 65     STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES WEST     NORTHWEST OF MCCOOK NEBRASKA TO 50 MILES SOUTH OF GOODLAND     KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED     WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).          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 395...WW 396...WW 397...          DISCUSSION...ARC OF DEEP CONVECTION WAS INCREASING AHEAD OF     LEE-TROUGH/DRYLINE IN NORTHEAST CO. AIR MASS TO THE EAST OF THIS     CONVECTION IS MODERATELY UNSTABLE AND SHOULD FUEL ONGOING     DEVELOPMENT AND PROVIDES POTENTIAL FOR INCREASING DEVELOPMENT. MASS     TRANSPORT INTO THE AREA WILL BE ENHANCED BY THE ONSET OF NOCTURNAL     LLJ AND SUBSEQUENT WARM AIR ADVECTION RESULTS IN ISENTROPIC ASCENT     ACROSS THE AREA TONIGHT. A BELT OF MODEST MID LEVEL WLY FLOW OF     25-30KT...BASED ON  REGIONAL VWPS...WILL ALSO RESULT IN SUFFICIENT     EFFECTIVE SHEAR TO MAINTAIN STORM ORGANIZATION WITH THE POSSIBILITY     OF A SMALL MCS EVOLVING AND SPREADING EAST ACROSS NWRN KS/SWRN NEB     OVER THE NEXT FEW HOURS. LARGE HAIL AND HIGH WINDS SHOULD BE THE     PRIMARY SEVERE WEATHER THREATS WITH THIS ACTIVITY.          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 500. MEAN STORM     MOTION VECTOR 27020.