

949 

WWUS20 KWNS 212140

SEL0

SPC WW 212140

MEZ000-CWZ000-220200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 730

NWS STORM PREDICTION CENTER NORMAN OK

540 PM EDT FRI AUG 21 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND NORTHERN MAINE

       COASTAL WATERS



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 540 PM UNTIL

1000 PM EDT.



HAIL TO 1 INCH 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 EAST AND WEST OF A LINE FROM 35 MILES NORTH

NORTHWEST OF CARIBOU MAINE TO 30 MILES EAST SOUTHEAST OF AUGUSTA

MAINE.  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 726...WW 727...WW

728...WW 729...



DISCUSSION...WRN ME QLCS WILL CONTINUE ENEWD.  WHILE SOME WEAKENING

APPEARS LIKELY AS CONVECTION ENCOUNTERS REGION THAT REMAINED

OVERCAST/LESS DEEPLY MIXED EARLIER TODAY...PRESENCE OF EXISTING

SUSTAINED STORMS/ SUPERCELLS WITHIN SQLN...STRENGTH OF BACKGROUND

WIND FIELD...AND AVAILABILITY OF RICH MOISTURE SUGGEST POTENTIAL FOR

LOCALLY DMG WIND...MARGINALLY SVR HAIL AND PERHAPS AN ISOLD TORNADO

THROUGH EARLY EVE.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 23035.





...CORFIDI

