597
FXUS62 KCHS 212031
AFDCHS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON SC
331 PM EST FRI FEB 21 2025
SYNOPSIS
COLD HIGH PRESSURE WILL BUILD INTO THE REGION THROUGH SATURDAY.
A WEAK DISTURBANCE WILL PASS TO OUR SOUTH ON MONDAY, FOLLOWED
BY HIGH PRESSURE THROUGH WEDNESDAY. A COLD FRONT MAY MOVE
THROUGH ON THURSDAY.
NEAR TERM /UNTIL 6 AM SATURDAY MORNING/
TONIGHT: HIGH PRESSURE WILL GRADUALLY SHIFT EASTWARD ACROSS THE
CENTRAL APPALACHIANS THROUGH THE NIGHT AND REMAIN THE PRIMARY
WEATHER FEATURE ACROSS THE FORECAST AREA. THIS SETUP SHOULD
ALLOW WINDS TO DECOUPLE THIS EVENING AND REMAIN CALM OR VERY
LIGHT THROUGH THE OVERNIGHT. SKIES SHOULD BE MOSTLY CLEAR FOR
MOST OF THE NIGHT, THOUGH WE WILL SEE SOME MOSTLY THIN CIRRUS
PASS THROUGH LATE. OVERALL, RADIATIONAL COOLING CONDITIONS ARE
EXPECTED TO GOOD WHICH WILL YIELD ANOTHER NIGHT OF COLD
TEMPERATURES. LOWS ARE FORECAST TO DIP TO NEAR THE MID 20S
INLAND, RANGING TO THE UPPER 20S AND LOW 30S ALONG THE IMMEDIATE
COAST. THE LACK OF WIND WILL PREVENT WIND CHILLS FROM GETTING
TOO LOW AND A COLD WEATHER ADVISORY WILL NOT BE NEEDED.
SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/
COOL HIGH PRESSURE WILL PREVAIL OVER THE AREA ON SATURDAY.
SUNNY SKIES IN THE MORNING WILL BECOME PARTLY CLOUDY IN THE
AFTERNOON AS A POTENT UPPER SHORTWAVE APPROACHES FROM THE WEST.
HIGHS WILL REACH THE MID TO UPPER 50S, EXCEPT LOWER 60S FAR
SOUTH. AS THE SHORTWAVE MOVES THROUGH SATURDAY NIGHT, A WEAK
COASTAL TROUGH WILL DEVELOP ALONG THE SC COAST. A FEW SHOWERS
MAY BRUSH THE COASTAL AREAS SATURDAY NIGHT, BUT OTHERWISE DRY
CONDITIONS EXPECTED.
TEMPERATURES WILL MODERATE SOMEWHAT ON SUNDAY WITH HIGHS IN THE
LOW TO MID 60S. A SOUTHERN STREAM SHORTWAVE WILL MOVE ALONG THE
NORTHERN GULF COAST SUNDAY NIGHT AND MONDAY WITH A SURFACE LOW
MOVING THROUGH NORTHERN OR CENTRAL FLORIDA. THERE REMAIN SOME
MODEL DIFFERENCES WITH HOW CLOSE TO THE AREA THE SURFACE LOW
WILL TRACK. FOR NOW WE HAVE ISOLATED SHOWERS IN THE FORECAST FOR
COASTAL GA LATE SUNDAY NIGHT. MONDAY HIGHS WILL REACH THE
MIDDLE 60S.
LONG TERM /MONDAY NIGHT THROUGH FRIDAY/
WARM HIGH PRESSURE WILL PREVAIL FOR THE BRUNT OF THE LONG TERM
PERIOD. A COLD FRONT COULD CROSS THROUGH THE AREA ON THURSDAY,
BRINGING SCATTERED SHOWERS.
AVIATION /20Z FRIDAY THROUGH WEDNESDAY/
VFR CONDITIONS WILL PREVAIL AT KCHS, KJZI, AND KSAV THROUGH 18Z
SATURDAY.
EXTENDED AVIATION OUTLOOK: MAINLY VFR.
MARINE
TONIGHT: NORTH TO NORTHEAST FLOW WILL PERSIST THROUGH THE NIGHT
WITH WIND SPEEDS MOSTLY IN THE 10-15 KNOT RANGE. SEAS WILL
CONTINUE TO GRADUALLY DIMINISH THROUGH THE NIGHT AND ARE
FORECAST TO BECOME 2-3 FEET FOR THE NEARSHORE WATERS AND 3-4
FEET FOR THE OUTER WATERS BY SUNRISE SATURDAY.
SATURDAY THROUGH WEDNESDAY: WIND DIRECTION SHIFTS WILL BE
COMMON DURING THIS PERIOD AS WEAK DISTURBANCES MOVE THROUGH,
FOLLOWED BY REBUILDING HIGH PRESSURE. CONDITIONS EXPECTED TO
REMAIN WELL BELOW ADVISORY THRESHOLDS.
CLIMATE
RECORD LOW MAXIMUM TEMPERATURES:
FEBRUARY 21:
KCHS: 47/2020
CHS WATCHES/WARNINGS/ADVISORIES
GA...NONE.
SC...NONE.
MARINE...NONE.
NEAR TERM...BSH
SHORT TERM...JRL
LONG TERM...JRL
AVIATION...BSH/JRL
MARINE...BSH/JRL
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