

400 

WWUS20 KWNS 240701

SEL1

SPC WW 240701

MNZ000-NDZ000-SDZ000-241400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 211

NWS STORM PREDICTION CENTER NORMAN OK

200 AM CDT MON MAY 24 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN MINNESOTA

       SOUTHEAST NORTH DAKOTA

       NORTHEAST SOUTH DAKOTA



EFFECTIVE THIS MONDAY MORNING FROM 200 AM UNTIL 900 AM CDT.



HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 75 MILES WEST

NORTHWEST OF MOBRIDGE SOUTH DAKOTA TO 55 MILES SOUTH OF BEMIDJI

MINNESOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 209...WW 210...



DISCUSSION...WIDESPREAD DEEP CONVECTION WILL CONTINUE TO EXPAND

NORTH ACROSS THE WATCH AREA THROUGH THE PRE-DAWN HOURS TODAY. STORMS

ARE BEING FED BY VERY STRONG INSTABILITY ON THE NRN PERIPHERY OF

PLAINS CAPPING INVERSION. EXPECT ISENTROPIC ASCENT ACROSS A WARM

FRONT...COUPLED WITH INCREASING LARGE SCALE SUPPORT FROM APPROACHING

SHORT WAVE TROUGH WILL SUSTAIN THE ACTIVITY WITHIN STRONGLY SHEARED

CLOUD-BEARING FLOW. PRIMARY HAZARD WILL BE LARGE HAIL GIVEN

MAGNITUDE OF INSTABILITY AND SHEAR NUMBER OF THUNDERSTORMS EXPECTED.



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 19050.





...CARBIN

