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Home Return to list Heat Advisory 0020 Issued by the Charleston Forecast Office
Action: New Issued At: 2026-08-11 13:00:18 990 WWUS72 KCHS 111759 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 159 PM EDT Tue Aug 11 2026 GAZ217>219-239>241-SCZ148>152-120200- /O.NEW.KCHS.HT.Y.0020.260812T1500Z-260813T0000Z/ /O.CON.KCHS.HT.Y.0019.000000T0000Z-260812T0000Z/ Coastal Bryan-Inland Chatham-Coastal Chatham-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Oak Level, Townsend, Chelsea, Hilton Head Island, Pooler, Beaufort, Edisto Beach, Garden City, Levy, Charleston, Daniel Island, Mount Pleasant, Wilmington Island, Fort Mcallister, Savannah, North Charleston, Tybee Island, Jasper, and Darien 159 PM EDT Tue Aug 11 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT WEDNESDAY... * WHAT...For the first Heat Advisory, heat index values up to 110. For the second Heat Advisory, heat index values up to 111 expected. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...For the first Heat Advisory, until 8 PM EDT this evening. For the second Heat Advisory, from 11 AM to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ETM Action: Continued Issued At: 2026-08-11 18:31:56 683 WWUS72 KCHS 112331 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 731 PM EDT Tue Aug 11 2026 GAZ217>219-239>241-SCZ148>152-120745- /O.EXP.KCHS.HT.Y.0019.000000T0000Z-260812T0000Z/ /O.CON.KCHS.HT.Y.0020.260812T1500Z-260813T0000Z/ Coastal Bryan-Inland Chatham-Coastal Chatham-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Beaufort, Townsend, Oak Level, Tybee Island, Wilmington Island, Charleston, Pooler, Jasper, Hilton Head Island, Edisto Beach, Levy, North Charleston, Darien, Daniel Island, Savannah, Mount Pleasant, Garden City, Fort Mcallister, and Chelsea 731 PM EDT Tue Aug 11 2026 ...HEAT ADVISORY WILL EXPIRE AT 8 PM EDT THIS EVENING... ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT WEDNESDAY... * WHAT...Heat index values up to 111 degrees expected. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...From 11 AM to 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ BSH Action: Continued Issued At: 2026-08-12 01:15:38 054 WWUS72 KCHS 120615 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 215 AM EDT Wed Aug 12 2026 GAZ217>219-239>241-SCZ148>152-121415- /O.NEW.KCHS.XH.A.0002.260813T1500Z-260814T0000Z/ /O.CON.KCHS.HT.Y.0020.260812T1500Z-260813T0000Z/ Coastal Bryan-Inland Chatham-Coastal Chatham-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of North Charleston, Savannah, Fort Mcallister, Beaufort, Oak Level, Darien, Tybee Island, Jasper, Daniel Island, Wilmington Island, Pooler, Chelsea, Charleston, Edisto Beach, Levy, Townsend, Hilton Head Island, Garden City, and Mount Pleasant 215 AM EDT Wed Aug 12 2026 ...EXTREME HEAT WATCH IN EFFECT FROM THURSDAY MORNING THROUGH THURSDAY EVENING... ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT THIS EVENING... * WHAT...For the Heat Advisory, heat index values up to 110 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 115 possible. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...For the Heat Advisory, from 11 AM this morning to 8 PM EDT this evening. For the Extreme Heat Watch, from Thursday morning through Thursday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NED Action: Continued Issued At: 2026-08-12 05:45:37 170 WWUS72 KCHS 121045 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 645 AM EDT Wed Aug 12 2026 GAZ217>219-239>241-SCZ148>152-121845- /O.CON.KCHS.HT.Y.0020.260812T1500Z-260813T0000Z/ /O.CON.KCHS.XH.A.0002.260813T1500Z-260814T0000Z/ Coastal Bryan-Inland Chatham-Coastal Chatham-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of North Charleston, Savannah, Fort Mcallister, Beaufort, Oak Level, Darien, Tybee Island, Jasper, Daniel Island, Wilmington Island, Pooler, Chelsea, Charleston, Edisto Beach, Levy, Townsend, Hilton Head Island, Garden City, and Mount Pleasant 645 AM EDT Wed Aug 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT THIS EVENING... ...EXTREME HEAT WATCH REMAINS IN EFFECT FROM THURSDAY MORNING THROUGH THURSDAY EVENING... * WHAT...For the Heat Advisory, heat index values up to 110 expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values up to 115 possible. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...For the Heat Advisory, from 11 AM this morning to 8 PM EDT this evening. For the Extreme Heat Watch, from Thursday morning through Thursday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ NED Action: Continued Issued At: 2026-08-12 12:30:49 733 WWUS72 KCHS 121730 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 130 PM EDT Wed Aug 12 2026 GAZ217>219-239>241-SCZ148>152-130230- /O.UPG.KCHS.XH.A.0002.260813T1500Z-260814T0000Z/ /O.NEW.KCHS.XH.W.0005.260813T1500Z-260814T0000Z/ /O.CON.KCHS.HT.Y.0020.000000T0000Z-260813T0000Z/ Coastal Bryan-Inland Chatham-Coastal Chatham-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of North Charleston, Edisto Beach, Daniel Island, Fort Mcallister, Oak Level, Pooler, Wilmington Island, Tybee Island, Beaufort, Jasper, Townsend, Levy, Garden City, Savannah, Darien, Mount Pleasant, Charleston, Hilton Head Island, and Chelsea 130 PM EDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...For the Heat Advisory, heat index values 108 to 112 degrees. For the Extreme Heat Warning, dangerously hot conditions with heat index values 112 to 117 degrees expected. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...For the Heat Advisory, until 8 PM EDT this evening. For the Extreme Heat Warning, from 11 AM to 8 PM EDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$ GAZ087-088-099>101-114-115-137-216-238-SCZ040-042>045-147-130230- /O.NEW.KCHS.HT.Y.0021.260813T1500Z-260814T0000Z/ Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans-Long- Inland Bryan-Inland Liberty-Allendale-Hampton-Inland Colleton- Dorchester-Inland Berkeley-Inland Jasper- Including the cities of Walterboro, Richmond Hill, Claxton, Pembroke, Reidsville, Moncks Corner, Hampton, Allendale, Ridgeland, Summerville, Millen, Rincon, Metter, Statesboro, Springfield, Ludowici, Saint George, Goose Creek, Fort Stewart, Hinesville, Sylvania, and Yemassee 130 PM EDT Wed Aug 12 2026 ...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values 108 to 112 degrees expected. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ ST Action: Cancelled Issued At: 2026-08-12 18:04:58 857 WWUS72 KCHS 122304 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 704 PM EDT Wed Aug 12 2026 GAZ217>219-239>241-SCZ148>152-130715- /O.CAN.KCHS.HT.Y.0020.000000T0000Z-260813T0000Z/ /O.CON.KCHS.XH.W.0005.260813T1500Z-260814T0000Z/ Coastal Bryan-Inland Chatham-Coastal Chatham-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Mount Pleasant, Savannah, North Charleston, Fort Mcallister, Charleston, Townsend, Darien, Garden City, Beaufort, Edisto Beach, Chelsea, Oak Level, Daniel Island, Pooler, Jasper, Wilmington Island, Hilton Head Island, Levy, and Tybee Island 704 PM EDT Wed Aug 12 2026 ...HEAT ADVISORY IS CANCELLED... ...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Dangerously hot conditions with heat index values of 113 degrees or higher expected. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ GAZ087-088-099>101-114-115-137-216-238-SCZ040-042>045-147-130715- /O.CON.KCHS.HT.Y.0021.260813T1500Z-260814T0000Z/ Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans-Long- Inland Bryan-Inland Liberty-Allendale-Hampton-Inland Colleton- Dorchester-Inland Berkeley-Inland Jasper- Including the cities of Fort Stewart, Rincon, Moncks Corner, Richmond Hill, Hinesville, Sylvania, Springfield, Pembroke, Millen, Reidsville, Summerville, Metter, Statesboro, Ludowici, Ridgeland, Hampton, Goose Creek, Walterboro, Saint George, Claxton, Allendale, and Yemassee 704 PM EDT Wed Aug 12 2026 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values up to 112 degrees expected. * WHERE...Portions of southeast Georgia and southeast South Carolina. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. && $$ BSH | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||