

000 

WWUS20 KWNS 182235

SEL0

SPC WW 182235

SDZ000-190600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 700

NWS STORM PREDICTION CENTER NORMAN OK

530 PM CDT FRI JUL 18 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN SOUTH DAKOTA



EFFECTIVE THIS FRIDAY AFTERNOON AND SATURDAY MORNING FROM 530 PM

UNTIL 100 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 EAST AND WEST OF A LINE FROM 55 MILES EAST

NORTHEAST OF BUFFALO SOUTH DAKOTA TO 70 MILES SOUTH OF PHILIP

SOUTH DAKOTA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 698...WW 699...



DISCUSSION...AIR MASS HAS RECOVERED ACROSS WRN SD TODAY WITH AXIS OF

MODERATE INSTABILITY NOW IN PLACE.  STORMS ARE EXPECTED TO CONTINUE

INCREASING IN COVERAGE AND INTENSITY THROUGH THE EVENING ACROSS WRN

SD AS LLJ INTENSIFIES AND ONGOING CELLS PERSIST ESEWD.  EXPECT

THREATS FOR SUPERCELLS ALONG WITH EVOLUTION INTO A MORE ORGANIZED

MCS DURING THE EVENING.  LARGE HAIL AND DAMAGING WINDS ARE EXPECTED

TO BE PRIMARY SEVERE THREATS...ALTHOUGH A BRIEF WINDOW OF SLIGHTLY

HIGHER TORNADO POTENTIAL MAY OCCUR AROUND SUNSET.



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 500. MEAN STORM

MOTION VECTOR 28025.





...EVANS

