#9 Postby M_0331 » Sat Oct 11, 2008 3:10 pm
000
FXUS62 KCHS 111947
AFDCHS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON SC
347 PM EDT SAT OCT 11 2008
.SYNOPSIS...
-- Changed Discussion --LOW PRES WILL SHIFT SOUTHWEST FROM THE COASTAL WATERS INTO NORTHEAST FLORIDA THIS WEEKEND...AS STRONG HIGH PRES BUILDS INTO
THE REGION FROM THE NORTH. HIGH PRESSURE WILL EXPAND BY EARLY NEXT
WEEK AND REMAIN OVER THE AREA THROUGH THE MIDDLE OF NEXT WEEK...WITH
DRY CONDITIONS AND UNSEASONABLY WARM TEMPERATURES EXPECTED. A WEAK
COLD FRONT IS THEN EXPECTED TO PUSH THROUGH THE AREA LATE NEXT
WEEK.-- End Changed Discussion --
&&
.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
-- Changed Discussion --SHOWERS CONTINUE TO DEVELOP ACROSS THE FORECAST AREA WITHIN A PLUME OF DEEP MOISTURE ROTATING ALONG THE NORTHERN SIDE OF A
PERSISTENT UPPER LOW OFF THE SOUTH CAROLINA COAST. THICK CLOUD
COVER ALSO LINGERS OVER SOUTHEAST SOUTH CAROLINA AND SOUTHEAST
GEORGIA...SUPPRESSING TEMPERATURES THIS AFTERNOON IN THE 70S.
BREEZY CONDITIONS HAVE ALSO DEVELOPED DURING THE PAST FEW
HOURS...AS SURFACE HIGH PRESSURE BUILDING FROM THE NORTH HAS
TIGHTENED THE PRESSURE GRADIENT BETWEEN A COASTAL TROUGH OFFSHORE.
EXPECT PERIODS OF RAIN TO AFFECT MAINLY THE NORTHERN AND EASTERN
ZONES THROUGH THE REMAINDER OF THE AFTERNOON AND INTO THE EVENING
HOURS WITHIN CONTINUED MOISTURE ADVECTION FROM THE NORTH. MODELS
INDICATE THE UPPER LOW AND COASTAL TROUGH DRIFTING SOUTH AND WEST
TOWARD THE GEORGIA/NORTHEAST FLORIDA COASTLINE OVERNIGHT...AS HIGH
PRESSURE PUSHES DOWN FROM THE NORTH. BEST DEEP LAYER MOISTURE AND
LIFT WILL ALSO SHIFT SOUTHWARD ALONG WITH THE SURFACE AND UPPER
LEVEL FEATURES. HAVE THUS TRANSITIONED POP SCHEME TO SHOW HIGHEST
RAIN CHANCES OVER THE WATERS AFTER MIDNIGHT...THEN 60 TO 70 PERCENT
ALONG THE COAST...WITH POPS DECREASING INLAND. THERE REMAINS A
SLIGHT CHANCE FOR EMBEDDED WEAK THUNDERSTORMS OVERNIGHT...HOWEVER
CONFIDENCE IS LESSENED BY THE LACK OF THUNDER ACROSS THE AREA THIS
AFTERNOON.
.SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/...
-- Changed Discussion --UPPER LEVEL LOW AND DAMPENING COASTAL TROUGH WILL PUSH SOUTH AND
WEST INTO SOUTHEAST GEORGIA/NORTHEAST FLORIDA ON SUNDAY. BEST
COVERAGE OF PRECIPITATION WILL SHIFT TO THE SOUTH ACCORDINGLY WITH
THE DEEP LAYER MOISTURE. AT THE SAME TIME...BUILDING HIGH PRESSURE
WILL BEGIN TO PUSH DRIER AIR INTO THE REGION FROM THE NORTH. THUS
EXPECT PRECIP CHANCES TO DECREASE FROM NORTH TO SOUTH THROUGH THE
MORNING AND AFTERNOON HOURS. SUNDAY WILL BEGIN WITH LIKELY POPS
ALONG THE COAST AND CHANCE POPS ELSEWHERE. BY THE AFTERNOON
HOURS...LIKELY RAIN CHANCES WILL BE LIMITED TO MAINLY THE COASTAL
GEORGIA COUNTIES.
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