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NOUS42 KCHS 281930
PNSCHS
GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>052-291930-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
330 PM EDT SUN JUN 28 2020
...REVIEW OF THE NATIONAL WEATHER SERVICE EXCESSIVE 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:
..EXCESSIVE HEAT WATCH
AN EXCESSIVE HEAT WATCH IS ISSUED WHENEVER THERE IS A 50 PERCENT
OR GREATER PROBABILITY THAT MAXIMUM HEAT INDEX VALUES WILL MEET
OR EXCEED 115 DEGREES FOR AT LEAST TWO HOURS WITHIN 12 TO
48 HOURS.
..EXCESSIVE HEAT WARNING
AN EXCESSIVE HEAT WARNING IS ISSUED WHENEVER THERE IS AN
80 PERCENT OR GREATER PROBABLY THAT MAXIMUM HEAT INDEX VALUES
WILL MEET OR EXCEED 115 DEGREES FOR AT LEAST TWO HOURS WITHIN
12 TO 24 HOURS.
..HEAT ADVISORY
A HEAT ADVISORY IS ISSUED WHENEVER MAXIMUM HEAT INDEX VALUES OF
110-114 DEGREES ARE EXPECTED TO OCCUR FOR AT LEAST TWO HOURS.
PRIOR TO JULY 1 THE HEAT INDEX CRITERIA IS 105-114 DEGREES.
ADDITIONAL INFORMATION, INCLUDING SAFETY INFORMATION AND FATALITY
STATISTICS, CAN BE FOUND AT THE FOLLOWING WEB ADDRESS:
WWW.NWS.NOAA.GOV/OM/HEAT/INDEX.SHTML
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