257  
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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