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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS62 KCAE 250042
AFDCAE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE COLUMBIA SC
842 PM EDT FRI MAY 24 2013

.SYNOPSIS...
COOL HIGH PRESSURE WILL SETTLE OVER THE REGION FOR THE
WEEKEND...BRINGING BELOW NORMAL TEMPERATURES AND DRY WEATHER.

&&

.NEAR TERM /TONIGHT/...
-- Changed Discussion --
HIGH PRESSURE CONTINUES TO BUILD INTO THE REGION FROM THE
NORTHWEST WITH WEAK COLD ADVECTION CONTINUING THROUGH TONIGHT.
WINDS HAVE RELAXED WITH SUNSET AND THE LOSS OF GOOD MIXING. WITH
DRIER AIRMASS MOVING IN...FOG IS NOT EXPECTED TO BE AN ISSUE
TONIGHT.

SKIES WILL BE CLEAR...AIRMASS DRY...BUT WINDS NOT EXPECTED TO BE
COMPLETELY CALM. SO NOT EXACTLY AN IDEAL RADIATIONAL COOLING
SCENARIO OVERNIGHT. WINDS ARE LIKELY TO FALL TO NEAR CALM DURING
THE PREDAWN HOURS ON SATURDAY WHICH COULD ALLOW SOME OF THE
OUTLYING AREAS TO DROP SEVERAL DEGREES JUST BEFORE SUNRISE.
OVERNIGHT LOW TEMPERATURE WILL BE WELL BELOW NORMAL...WITH
POSSIBLE RECORD LOWS BEING REACHED IF WINDS CAN GO CALM NEAR
SUNRISE AND DEWPOINTS DROP LOWER THAN FORECAST. STILL THINK LOWS
WILL REMAIN A DEGREE OR TWO ABOVE RECORD VALUES THOUGH.
-- End Changed Discussion --

&&

.SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/...
MODELS IN GOOD AGREEMENT SATURDAY THROUGH SUNDAY NIGHT. SHORT
WAVE EXITS TO THE EAST SATURDAY AS COOL HIGH PRESSURE BUILDS
ACROSS THE REGION THROUGH SATURDAY NIGHT. AIRMASS BEGINS TO MODIFY
BY SUNDAY AS OLD FRONTAL BOUNDARY TO THE SOUTH RETURNS NORTHWARD
AS A WARM FRONT. MOSTLY CLEAR SATURDAY BUT MORE CLOUDS BY SUNDAY
BUT NO RAIN AS ATMOSPHERE IS STILL DRY BOTH SUNDAY AND SUNDAY
NIGHT. COOL SATURDAY WITH HIGHS IN THE UPPER 70S...INCREASE TO THE
LOWER 80S BY SUNDAY. STILL COOL SATURDAY NIGHT BUT NOT AS COOL AS
FRIDAY NIGHT WITH LOWS IN THE UPPER 40S TO LOWER 50S.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
THE MEDIUM RANGE MODELS ARE IN GOOD AGREEMENT SHOWING UPPER RIDGE
OVER THE MISSISSIPPI VALLEY MONDAY BUILDING EASTWARD ACROSS THE
REGION THROUGH THURSDAY. THE RIDGE BEGINS TO MOVE MORE TOWARD THE
EAST COAST FRIDAY. ALSO...A WARM FRONTAL BOUNDARY ACROSS THE
FORECAST AREA MONDAY LIFTS TO THE NORTHEAST AND AWAY FROM THE AREA
TUESDAY THROUGH FRIDAY. THIS UPPER RIDGE IS EXPECTED TO HOLD ANY
FRONTS WELL TO THE NORTH AND WEST DURING THE EXTENDED PERIOD.
SOUTH TO SOUTHWEST LOW LEVEL WIND FLOW WILL BRING MORE WARM
UNSTABLE AIR TO THE REGION AND THE ATMOSPHERE WILL BECOME
CONDITIONALLY UNSTABLE. STILL DRY MONDAY THOUGH BUT INCLUDED
DIURNAL CONVECTIVE ACTIVITY TUESDAY THROUGH THURSDAY. UPPER RIDGE
PRETTY STRONG AND JUST ABOUT RIGHT OVER THE AREA FRIDAY...SO LEFT
DRY FOR FRIDAY AS WELL. HIGHS IN THE MID 80S MONDAY AND TUESDAY
AND THE MID TO UPPER 80S WEDNESDAY THROUGH FRIDAY. OVERNIGHT LOWS
MAINLY IN THE LOWER 60S.

&&

.AVIATION /01Z SATURDAY THROUGH WEDNESDAY/...
VFR CONDITIONS WILL CONTINUE THROUGH THE 24 HOUR TAF PERIOD.

DRIER AIR BEHIND A FRONT THAT PASSED THROUGH EARLIER TODAY WILL
ENSURE VFR CONDITIONS. NORTHERLY SURFACE WINDS ARE EXPECTED TO
DECREASE IN SPEED AFTER DUSK...THOUGH 20 KNOTS OF BOUNDARY LAYER
WIND COULD CONTINUE INTO LATE TONIGHT.

EXTENDED AVIATION OUTLOOK...NO SIGNIFICANT IMPACTS TO AVIATION
EXPECTED.

&&

.CLIMATE...
MUCH BELOW NORMAL TEMPERATURES WILL OCCUR TONIGHT WITH LOWS IN
THE 40S.

COLUMBIA METRO AIRPORT RECORD LOW FOR MAY 25TH...45 SET IN 1967
AUGUSTA BUSH FIELD RECORD LOW FOR MAY 25TH.......43 SET IN 1951

&&

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

$$