663
FXUS62 KCHS 251124
AFDCHS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON SC
624 AM EST SUN JAN 25 2026
WHAT HAS CHANGED
HOURLY TEMPERATURES HAVE BEEN ADJUSTED DOWN TO MATCH CURRENT
OBSERVATIONS. ADDITIONALLY, THE MAX TEMPERATURE FOR TODAY HAS
BEEN DECREASED DUE TO THE STRENGTH OF THE COLD AIR DAMMING IN
PLACE. THE AVIATION SECTION HAS BEEN UPDATED TO REFLECT THE 12Z
TAF ISSUANCE. THE GALE WARNING ACROSS THE MARINE ZONES HAS BEEN
REPLACED WITH A SMALL CRAFT ADVISORY. THE SMALL CRAFT ADVISORY
IN THE CHARLESTON HARBOR HAS EXPIRED.
KEY MESSAGES
- 1) FREEZING RAIN/FREEZING DRIZZLE WILL BE LIKELY ACROSS FAR
INTERIOR COUNTIES OF SE SC AND SE GA THROUGH THIS MORNING.
- 2) ARCTIC AIR WILL YIELD VERY COLD TEMPERATURES MONDAY NIGHT
INTO NEXT WEEKEND, WITH COLD WEATHER ADVISORIES POSSIBLE.
DISCUSSION
KEY MESSAGE 1: FREEZING RAIN/FREEZING DRIZZLE WILL BE LIKELY
ACROSS FAR INTERIOR COUNTIES OF SE SC AND SE GA THROUGH THIS
MORNING.
ANALYZING BOTH RADAR IMAGERY FROM KJAX AND INFRARED SATELLITE
IMAGERY, LOW PRESSURE HAS DEVELOPED OFF THE SE GA COAST AS OF
EARLY THIS MORNING. SURFACE ANALYSIS DEPICTS A STRONG COLD AIR
DAMMING (CAD) SET UP EAST OF THE APPALACHIAN MOUNTAINS AS A
STRONG (1042 MB) HIGH PRESSURE CENTER SITS OVER NEW ENGLAND.
TEMPERATURES HAVE DROPPED BELOW FREEZING IN SEVERAL LOCATIONS
ACROSS SE SC. THE COVERAGE OF BELOW FREEZING TEMPERATURES IS
EXPECTED TO EXPAND AS DIABATIC PROCESSES FROM THE PRECIPITATION
COOL THE AIR FURTHER TO THE WET BULB. THE WINTER WEATHER
ADVISORY HAS BEEN EXPANDED IN AREA TO INCLUDE TIDAL BERKELEY AND
CHARLESTON COUNTIES AS FREEZING DRIZZLE COULD YIELD A TRACE OF
ICE ACROSS AREAS AWAY FROM THE IMMEDIATE COASTLINE. ROADS,
ESPECIALLY ELEVATED BRIDGES AND OVERPASSES, COULD BECOME SLICK
FOR ANYONE TRAVELING THIS MORNING. TEMPERATURES ARE FORECAST TO
RISE ABOVE FREEZING LATE THIS MORNING, HOWEVER CONDITIONS WILL
STILL REMAIN CHILLY AS THE CAD WILL LIKELY BE SLOW TO ERODE.
KEY MESSAGE 2: ARCTIC AIR WILL YIELD VERY COLD TEMPERATURES MONDAY NIGHT
INTO NEXT WEEKEND, WITH COLD WEATHER ADVISORIES POSSIBLE.
AN ARCTIC AIRMASS WILL EXPAND INTO THE REGION ON MONDAY BEHIND
THE COLD FRONT. A REINFORCING HIGH WILL BUILD IN ON THURSDAY
BEHIND A DRY COLD FRONT. OVERNIGHT LOWS WILL BE IN THE UPPER
TEENS TO LOWER 20S MONDAY NIGHT, THEN IN THE LOW/MID 20S THROUGH
THE WEEKEND. WITH 5-10 KT WINDS EACH OVERNIGHT PERIOD, WIND
CHILLS WILL DIP TO 10-20F FOR A FEW HOURS STRADDLING DAYBREAK
EACH DAY. WE EXPECT TO NEED A SERIES OF COLD WEATHER ADVISORIES
DURING THIS PERIOD.
THERE REMAINS A LOW CHANCE THAT A SOUTHERN STREAM LOW COULD
BRING WINTRY PRECIPITATION NEXT WEEKEND.
AVIATION /12Z SUNDAY THROUGH THURSDAY/
THE 12Z TAF PERIOD WILL BEGIN WITH IFR CONDITIONS AT KCHS/KJZI
AND MVFR CIGS AT KSAV. PRECIPITATION HAS ENDED ACROSS THE
TERMINALS THIS MORNING, ALTHOUGH SOME DRIZZLE WILL BE POSSIBLE
THROUGH THE FIRST COUPLE HOURS AFTER DAYBREAK. NO VSBY IMPACTS
FROM THAT IS EXPECTED SO NO MENTION IN THE TAFS. IFR/MVFR
CONDITIONS WILL DOMINATE TODAY AND INTO TONIGHT. A LINE OF
SHOWERS IS FORECAST TO PUSH THROUGH THE REGION, ASSOCIATED WITH
A COLD FRONT, AROUND MIDNIGHT TONIGHT. RETURN TO MVFR CIGS
THIS EVENING.
EXTENDED AVIATION FORECAST: VFR.
MARINE
A VERY TIGHT NE GRADIENT CONTINUES OVER THE ATLANTIC WATERS AS
STRONG HIGH PRESSURE CONTINUES TO WEDGE IN FROM THE NORTH WHILE
SURFACE LOW PRESSURE DEVELOPS OFF THE GA/SC COAST. THE GALE
WARNINGS PREVIOUSLY IN PLACE HAVE BEEN REPLACED WITH SMALL CRAFT
ADVISORIES AS THE STRONGEST GRADIENT HAS MOVED NORTH OF THE
LOCAL WATERS. CONDITIONS SHOULD DROP BELOW ADVISORY CRITERIA BY
TUESDAY MORNING.
EQUIPMENT
THE KCLX RADAR WILL REMAIN OUT OF SERVICE. CRITICAL PARTS ARE ON
ORDER AND SHOULD ARRIVE ON MONDAY. USERS SHOULD USE ADJACENT WSR-88D
SITES, INCLUDING KCAE, KLTX, KJAX, KVAX AND KJGX.
CHS WATCHES/WARNINGS/ADVISORIES
GA...WINTER WEATHER ADVISORY UNTIL 1 PM EST THIS AFTERNOON FOR
GAZ087-088.
SC...WINTER WEATHER ADVISORY UNTIL 1 PM EST THIS AFTERNOON FOR
SCZ040-042>045-050-052.
MARINE...SMALL CRAFT ADVISORY UNTIL 6 AM EST TUESDAY FOR AMZ350-352-354-
374.
CPM/JRL
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