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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
836 AM EDT TUE JUL 7 2026
..REVIEW OF THE NATIONAL WEATHER SERVICE HEAT PROGRAM
SOUTHEAST SOUTH CAROLINA AND SOUTHEAST GEORGIA IS NO STRANGER TO
EXCESSIVE HEAT. HOWEVER, THERE ARE TIMES WHEN UNUSUALLY HOT AND
POTENTIALLY DANGEROUS CONDITIONS DO OCCUR. ABOUT 175 AMERICANS
SUCCUMB TO THE TAXING DEMANDS OF HEAT EVERY YEAR.
FORECASTERS AT THE NATIONAL WEATHER SERVICE IN CHARLESTON ARE
RESPONSIBLE FOR THE TIMELY ISSUANCE OF WATCHES, WARNINGS AND
ADVISORIES FOR EXCESSIVE HEAT WHENEVER CONDITIONS MEET OR EXCEED
REGIONALLY DEFINED CRITERIA.
FOR SOUTHEAST SOUTH CAROLINA AND SOUTHEAST GEORGIA, THE FOLLOWING
CRITERIA ARE USED TO DETERMINE WHEN WATCHES, WARNINGS
AND ADVISORIES FOR EXCESSIVE HEAT ARE ISSUED:
..EXTREME HEAT WATCH
AN EXTREME HEAT WATCH IS ISSUED WHENEVER THERE IS A 50 PERCENT OR
GREATER PROBABILITY THAT MAXIMUM HEAT INDEX VALUES WILL MEET OR
EXCEED 113 DEGREES FOR AT LEAST TWO HOURS, USUALLY WITHIN 12 TO
48 HOURS.
..EXTREME HEAT WARNING
AN EXTREME HEAT WARNING IS ISSUED WHENEVER THERE IS AN 80 PERCENT
OR GREATER PROBABLY THAT MAXIMUM HEAT INDEX VALUES WILL MEET OR
EXCEED 113 DEGREES FOR AT LEAST TWO HOURS, USUALLY WITHIN 12 TO
24 HOURS.
..HEAT ADVISORY
A HEAT ADVISORY IS ISSUED WHENEVER MAXIMUM HEAT INDEX VALUES OF
108-112 DEGREES ARE EXPECTED TO OCCUR FOR AT LEAST TWO HOURS.
ADDITIONAL INFORMATION, INCLUDING SAFETY INFORMATION AND BE FOUND
AT HEAT.GOV.
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