170  
NOUS42 KCHS 212103  
PNSCHS  
GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>052-222115-  
 
PUBLIC INFORMATION STATEMENT  
NATIONAL WEATHER SERVICE CHARLESTON SC  
503 PM EDT FRI JUL 21 2017  
   
..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 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 WITHIN 12 TO 24 HOURS.  
 
HEAT ADVISORY  
-------------  
A HEAT ADVISORY IS ISSUED WHENEVER MAXIMUM HEAT INDEX VALUES OF  
105-114 DEGREES ARE EXPECTED TO OCCUR FOR AT LEAST TWO HOURS.  
 
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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