743
FXUS62 KCHS 250609
AFDCHS
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHARLESTON SC
209 AM EDT THU JUN 25 2026
WHAT HAS CHANGED
ALL KEY MESSAGES AND SECTIONS WERE UPDATED.
KEY MESSAGES
- 1) TEMPERATURES ARE EXPECTED TO RISE OVER THE NEXT SEVERAL
DAYS, LIKELY APPROACHING TRIPLE DIGITS THIS WEEKEND. HEAT
ADVISORIES COULD BE NEEDED.
DISCUSSION
KEY MESSAGE 1: TEMPERATURES ARE EXPECTED TO RISE OVER THE NEXT
SEVERAL DAYS, LIKELY APPROACHING TRIPLE DIGITS THIS WEEKEND.
HEAT ADVISORIES COULD BE NEEDED.
THE PRIMARY WEATHER CONCERN THROUGH THE WEEKEND AND INTO EARLY
NEXT WEEK WILL BE A PERIOD OF ABOVE NORMAL TEMPERATURES. HIGH
TEMPERATURES IN THE LOWER 90S TODAY WILL CLIMB INTO THE MID TO
UPPER 90S BY SATURDAY, WITH THE HOTTEST CONDITIONS EXPECTED ON
SUNDAY WHEN TEMPERATURES ARE FORECAST TO APPROACH 100 DEGREES.
SOME LOCATIONS COULD CHALLENGE OR EVEN EXCEED DAILY RECORD
HIGHS. HIGHS IN THE MID 90S ARE FORECAST TO CONTINUE INTO AT
LEAST EARLY NEXT WEEK. OVERNIGHT CONDITIONS WILL ALSO BECOME
INCREASINGLY WARM, PROVIDING LIMITED RELIEF FROM THE DAYTIME
HEAT. LOW TEMPERATURES COULD APPROACH DAILY RECORD HIGH MINIMUM
VALUES AT SOME LOCATIONS. SEE THE CLIMATE SECTION BELOW FOR
ADDITIONAL DETAILS.
IN ADDITION TO THE RISING TEMPERATURES, INCREASING HUMIDITY
WILL DRIVE HEAT INDEX VALUES SIGNIFICANTLY HIGHER. THE
PROBABILITY OF HEAT INDEX VALUES INTO THE 105-110 DEGREE RANGE
WILL RISE NOTABLY FOR SATURDAY THROUGH MONDAY, ESPECIALLY ALONG
THE COAST WHERE THE HIGHEST DEWPOINTS ARE ANTICIPATED. ON
SUNDAY, HEAT INDEX VALUES ARE FORECAST TO EXCEED 102F ACROSS
MOST LOCATIONS, WITH VALUES OF 107- 112F POSSIBLE IN THE COASTAL
COUNTIES. HEAT ADVISORIES COULD EVENTUALLY BE NEEDED FOR
PORTIONS OF THE AREA WHERE HEAT INDICES OF 108F OR GREATER ARE
EXPECTED.
WHILE CONFIDENCE CONTINUES TO INCREASE IN A PERIOD OF
SIGNIFICANT HEAT, THERE IS STILL SOME UNCERTAINTY REGARDING
CONVECTIVE DEVELOPMENT AND ITS POTENTIAL IMPACT ON TEMPERATURES.
SATURDAY LOOKS LARGELY DRY WITH AT MOST ISOLATED SHOWERS/STORMS
INITIATING ALONG THE SEA BREEZE. HOWEVER, A SHORTWAVE COULD
DIVE INTO THE REGION SUNDAY OR MONDAY, POTENTIALLY RESULTING IN
SCATTERED SHOWERS/STORMS THAT COULD LIMIT DAYTIME HEATING AND
PREVENT SOME LOCATIONS FROM REACHING THEIR PEAK TEMPERATURES.
AVIATION /06Z THURSDAY THROUGH MONDAY/
25/06Z TAF DISCUSSION:
KCHS/KJZI/KSAV: VFR THROUGH 26/06Z.
EXTENDED AVIATION OUTLOOK: THERE ARE NO HIGH CONFIDENCE
CONCERNS.
MARINE
THROUGH TONIGHT: QUIET CONDITIONS WILL PERSIST ACROSS THE
COASTAL WATERS THROUGH TONIGHT. MODEST SEA BREEZE INFLUENCES
WILL OCCUR ALONG THE LAND/SEA INTERFACE AND CHARLESTON HARBOR,
TYPICAL FOR SUMMER. SPEEDS WILL REMAIN LESS THAN 15 KT THROUGH
TONIGHT ALTHOUGH IT WILL BE GUSTY IN THE CHARLESTON HARBOR WITH
THE SEA BREEZE. SEAS WILL AVERAGE 1-2 FT, POSSIBLY REACHING AS
HIGH AS 3 FT AT TIMES OVER PARTS OF THE EDISTO BEACH-ALTAMAHA
SOUND OFFSHORE LEGS LATE TONIGHT.
FRIDAY THROUGH TUESDAY: A PRETTY TYPICAL PATTERN IS EXPECTED
THROUGH THE PERIOD. WINDS WILL GENERALLY BE SOUTH TO SOUTHWEST,
WITH SOME MODEST SURGING INTO THE 15-20 KNOT RANGE AT TIMES.
WINDS WILL INCREASE ALONG THE LAND/SEA INTERFACE EACH AFTERNOON
AND EVENING WITH THE DEVELOPMENT OF THE SEA BREEZE. WE COULD SEE
A PERIOD OF GUSTS UP TO AROUND 25 KNOTS FRIDAY NIGHT THROUGH
SATURDAY EVENING ACROSS THE CHARLESTON COUNTY WATERS. SIMILARLY,
ANOTHER SURGE IS POSSIBLE TUESDAY, AND SMALL CRAFT ADVISORIES
COULD BE NEEDED.
CLIMATE
RECORD HIGH TEMPERATURES:
JUNE 28:
KCHS: 99/1998
KSAV: 100/1998
RECORD HIGH MINIMUM TEMPERATURES:
JUNE 27:
KCHS: 77/2015
JUNE 28:
KCHS: 78/2013
KCXM: 81/1998
KSAV: 80/1880
JUNE 29:
KCHS: 79/1977
KSAV: 80/1885
JUNE 30:
KSAV: 79/1880
CHS WATCHES/WARNINGS/ADVISORIES
GA...NONE.
SC...NONE.
MARINE...NONE.
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