

489 

WWUS20 KWNS 110028

SEL5

SPC WW 110028

SDZ000-110700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 295

NWS STORM PREDICTION CENTER NORMAN OK

730 PM CDT THU JUN 10 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF CENTRAL AND EASTERN SOUTH DAKOTA



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 730 PM

UNTIL 200 AM CDT.



HAIL TO 3 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST OF

PIERRE SOUTH DAKOTA TO 25 MILES EAST SOUTHEAST OF MITCHELL SOUTH

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 292...WW 293...WW 294...



DISCUSSION...STRONG/SEVERE THUNDERSTORMS DEVELOP AHEAD OF FRONTAL

ZONE WRN SD INTO A MDT/VERY UNSTABLE AIR MASS. SUPERCELLS INCLUDING

VERY LARGE HAIL EXPECTED TO DEVELOP EWD ACROSS THE WATCH AREA.

APPEARS ATTM THAT TORNADO THREAT IS SMALL GIVEN RELATIVELY WEAK LOW

LEVEL SHEAR AND SOMEWHAT ELEVATED NATURE OF STORMS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 26025.





...HALES

