Area Forecast Discussion
Issued by NWS Columbia, SC

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FXUS62 KCAE 252343
AFDCAE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
743 PM EDT FRI JUL 25 2014

.SYNOPSIS...
A NEARLY STATIONARY FRONTAL BOUNDARY OVER SOUTH SOUTH CAROLINA WILL
DISSIPATE SATURDAY. THUNDERSTORMS WILL BE ISOLATED SATURDAY AS
MOISTURE BECOMES MORE LIMITED. WEAK UPPER LEVEL RIDGING WILL
BRING HOT AND DRY WEATHER SUNDAY. ANOTHER COLD FRONT WILL CROSS
THE REGION LATE MONDAY WITH A CHANCE OF THUNDERSTORMS.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
LATEST SURFACE ANALYSIS SUGGESTS AT LEAST TWO SURFACE
BOUNDARIES...ONE APPEARS COULD BE THE MAIN FRONT JUST SOUTH OF THE
FORECAST AREA (FA)...WITH A DIFFERENTIAL HEATING BOUNDARY CAUSED BY
EARLIER CLOUD COVER ACROSS OUR SOUTH CENTRAL FA. RADAR INDICATES
CONVECTION DEVELOPING ALONG THESE FEATURES...WITH BETTER COVERAGE
ACROSS THE SOUTHERN AREA WHERE BETTER LOW LEVEL MOISTURE EXISTS.
SATELLITE WATER VAPOR IMAGERY INDICATES DRY AIR ALOFT WORKING
IN...WHICH COULD REDUCE AREAL COVERAGE FOR MUCH OF OUR FA...BUT THE
MOISTURE BOUNDARY ALOFT COINCIDENT WITH SURFACE BOUNDARIES COULD
PROVIDE A THREAT OF AN ISOLATED SEVERE CELL. AT THIS TIME...IT
APPEARS THE BEST THREAT OF ISOLATED SEVERE OR LOCALLY HEAVY RAIN
WILL BE MAINLY SOUTH AND EAST OF OUR FORECAST AREA...AND POSSIBLY
OUR SE FA.  WIDESPREAD LOW CLOUDINESS NORTH OF THE FRONT ACROSS THE
NORTHERN MIDLANDS BEGINNING TO SHOW SOME INDICATIONS OF GRADUALLY
DISSIPATING. AFTER DIURNAL CONVECTION DISSIPATES THIS
EVENING...EXPECT FAIR WEATHER OVERNIGHT.

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH SUNDAY NIGHT/...
FLAT RIDGING BUILDS ACROSS THE SOUTHERN STATES SATURDAY THROUGH
SUNDAY.

THE COLD FRONT WILL BECOME STATIONARY/DIFFUSE ACROSS THE SOUTHERN
SOUTH CAROLINA SATURDAY WITH DEEPER MOISTURE TO THE EAST ALTHOUGH
THE AIR MASS WILL BE WEAKLY TO MODERATELY UNSTABLE. CONVECTION
MORE ISOLATED ON SATURDAY AND SUNDAY WITH WEAKER FORCING.
TEMPERATURES ABOVE NORMAL FOR THE WEEKEND. PREFER WARMER MAV
GUIDANCE THROUGH THE PERIOD WITH RECENT COOL BIAS OF THE MET.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
MODELS CONTINUE TO TREND TOWARD AN AMPLIFICATION OF THE LONG WAVE
PATTERN WITH A RIDGE IN THE WEST AND A TROUGH IN THE EAST. THIS IS
A RARE PATTERN FOR JULY.

THE UPPER PATTERN ONCE AGAIN AMPLIFIES EARLY NEXT WEEK WITH A
RIDGE IN THE WEST AND A DEEP TROUGH IN THE EAST. THIS SHOULD PUSH
ANOTHER COLD FRONT THROUGH THE AREA LATE MONDAY INTO TUESDAY.
THERE SHOULD BE A GOOD CHANCE FOR SHOWERS AND THUNDERSTORMS MONDAY
AHEAD OF THE FRONT THEN MAINLY DRY FOR TUESDAY AND WEDNESDAY AS
HIGH PRESSURE BUILDS IN FROM THE NORTHWEST. BOTH THE GFS AND ECMWF
BRING INCREASING MOISTURE TO THE REGION THURSDAY INTO FRIDAY AS
HIGH PRESSURE WEDGES IN FROM THE NORTH WITH A LINGER TROUGH OFFSHORE
     RESULTING IN A MOIST EASTERLY FLOW.

ABOVE NORMAL TEMPERATURES WILL CONTINUE MONDAY AHEAD OF THE FRONT
WITH HIGHS IN THE UPPER 90S. COOLER TEMPERATURES ARE INDICATED
TUESDAY THROUGH FRIDAY WITH HIGHS IN THE MID/UPPER 80S AND LOWS
MOSTLY IN THE 60S.

&&

.AVIATION /23Z FRIDAY THROUGH WEDNESDAY/...
2230Z RADAR REFLECTIVITY SHOWS HEAVIER CONVECTIVE ACTIVITY SOUTHERN
PORTIONS OF THE FORECAST AREA. MULTIPLE BOUNDARY INTERACTIONS
PROVIDING TRIGGERS FOR THUNDERSTORM DEVELOPMENT THROUGH EARLY
EVENING. LOSS OF DAYTIME HEATING AND DRIER AIR WORKING ITS WAY SOUTH
AND EAST ACROSS THE REGION TONIGHT SHOULD SHUTDOWN CONVECTION BY
04Z. VFR MOST OF THE OVERNIGHT EXCEPT FOR A POSSIBILITY OF FOG
NEAR DAYBREAK...ESPECIALLY AT AGS AND OGB WHERE RAIN FELL EARLIER.
LOCAL RADIATION FOG FORMULA HINTS AT MVFR CONDITIONS FOR A FEW
HOURS 09Z-12Z. WILL MENTION FOG MOST SITES WITH 3-5SM
VISIBILITIES.

WEAKENING FRONT AND BEST MOISTURE EXPECTED TO PUSH TO THE SOUTH AND
EAST OF THE TERMINALS SATURDAY. VFR.

EXTENDED AVIATION OUTLOOK...MINIMAL CONVECTION EXPECTED SAT/SUN.
BETTER THUNDERSTORM CHANCES MONDAY WITH APPROACHING COLD FRONT.

&&

.CAE WATCHES/WARNINGS/ADVISORIES...
SC...NONE.
GA...NONE.
&&

$$






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