Public Information Statement
Issued by NWS Charleston, SC

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000 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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