

000 

WWUS20 KWNS 191538

SEL7

SPC WW 191538

ARZ000-LAZ000-MSZ000-192200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 417

NWS STORM PREDICTION CENTER NORMAN OK

1040 AM CDT TUE JUN 19 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST ARKANSAS

       PARTS OF NORTHEAST LOUISIANA

       LARGE PART OF MISSISSIPPI



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 1040 AM UNTIL

500 PM 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 90

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF

GREENVILLE MISSISSIPPI TO 35 MILES SOUTHWEST OF PINE BELT

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...WITH A VERY MOIST/UNSTABLE AIR MASS AND 20-30KT OF

SHEAR...THUNDERSTORMS WILL CONTINUE TO INTENSIFY ACROSS NRN MS INTO

ERN MS VICINITY SURFACE BOUNDARIES.  PRIMARY THREAT WILL BE DAMAGING

WINDS AS STORMS EVOLVE INTO LINE SEGMENTS AND DEVELOP SE.



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 31025.





...HALES

