Alert archive / South Carolina / Heat Advisories in 2021
Heat Advisory 2, NWS Charleston, SC
NWS Charleston, SC issued this heat advisory at Jul 30, 2021, 8:01 PM EDT for Berkeley County, Colleton County, Dorchester County, South Carolina; Effingham County, Long County, Georgia. It took effect at Jul 31, 2021, 11:00 AM EDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Jul 30, 2021, 8:01 PM EDT (00:01 UTC)
- In effect from
- Jul 31, 2021, 11:00 AM EDT
- Expired
- Jul 31, 2021, 7:45 PM EDT
- In force
- 9 hr
- Issued by
- NWS Charleston, SC
Counties Effingham County, GA, Long County, GA, Berkeley County, SC, Colleton County, SC, Dorchester County, SC
The radar
The Charleston,SC radar (KCLX), 21 km from the middle of the area, began a volume at 00:06 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 00:00Z, 0.0 hours before the alert went out and 82 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 3541 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 931 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 112 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
556 WWUS72 KCHS 310001 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 801 PM EDT Fri Jul 30 2021 GAZ101-116>119-137>141-SCZ043>045-047>052-310815- /O.NEW.KCHS.HT.Y.0002.210731T1600Z-210801T0000Z/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham- Coastal Chatham-Long-Inland Liberty-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Inland Colleton-Dorchester- Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Rincon, Springfield, Pembroke, Richmond Hill, Fort Mcallister, Oak Level, Garden City, Pooler, Savannah, Wilmington Island, Tybee Island, Ludowici, Hinesville, Fort Stewart, Townsend, Darien, Walterboro, Saint George, Summerville, Goose Creek, Moncks Corner, Ridgeland, Beaufort, Hilton Head Island, Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy, Chelsea, Jasper, and Daniel Island 801 PM EDT Fri Jul 30 2021 ...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM EDT SATURDAY... * WHAT...Heat index values up to 111 expected. * WHERE...Portions of southeast South Carolina and southeast Georgia. * WHEN...From noon to 8 PM EDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$
7 follow-up statements
991 WWUS72 KCHS 310423 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 1223 AM EDT Sat Jul 31 2021 GAZ101-116>119-137>141-SCZ043>045-047>052-311230- /O.CON.KCHS.HT.Y.0002.210731T1600Z-210801T0000Z/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham- Coastal Chatham-Long-Inland Liberty-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Inland Colleton-Dorchester- Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Rincon, Springfield, Pembroke, Richmond Hill, Fort Mcallister, Oak Level, Garden City, Pooler, Savannah, Wilmington Island, Tybee Island, Ludowici, Hinesville, Fort Stewart, Townsend, Darien, Walterboro, Saint George, Summerville, Goose Creek, Moncks Corner, Ridgeland, Beaufort, Hilton Head Island, Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy, Chelsea, Jasper, and Daniel Island 1223 AM EDT Sat Jul 31 2021 ...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 111 expected. * WHERE...Portions of Southeast South Carolina and Southeast Georgia. * WHEN...From noon today to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$
302 WWUS72 KCHS 310723 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 323 AM EDT Sat Jul 31 2021 GAZ101-116>119-137>141-SCZ043>045-047>052-311530- /O.EXT.KCHS.HT.Y.0002.210731T1500Z-210801T0000Z/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham- Coastal Chatham-Long-Inland Liberty-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Inland Colleton-Dorchester- Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Rincon, Springfield, Pembroke, Richmond Hill, Fort Mcallister, Oak Level, Garden City, Pooler, Savannah, Wilmington Island, Tybee Island, Ludowici, Hinesville, Fort Stewart, Townsend, Darien, Walterboro, Saint George, Summerville, Goose Creek, Moncks Corner, Ridgeland, Beaufort, Hilton Head Island, Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy, Chelsea, Jasper, and Daniel Island 323 AM EDT Sat Jul 31 2021 ...HEAT ADVISORY NOW IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT THIS EVENING... * WHAT...Heat index values 110 to 113 possible. * WHERE...Portions of Southeast South Carolina and Southeast Georgia, mainly along and east of I-95. This includes the Charleston and Savannah Metro Areas. * WHEN...From 11 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Isolated to scattered afternoon thunderstorms could bring relief to some locations during the afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$
685 WWUS72 KCHS 311003 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 603 AM EDT Sat Jul 31 2021 GAZ101-116>119-137>141-SCZ043>045-047>052-311815- /O.CON.KCHS.HT.Y.0002.210731T1500Z-210801T0000Z/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham- Coastal Chatham-Long-Inland Liberty-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Inland Colleton-Dorchester- Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Rincon, Springfield, Pembroke, Richmond Hill, Fort Mcallister, Oak Level, Garden City, Pooler, Savannah, Wilmington Island, Tybee Island, Ludowici, Hinesville, Fort Stewart, Townsend, Darien, Walterboro, Saint George, Summerville, Goose Creek, Moncks Corner, Ridgeland, Beaufort, Hilton Head Island, Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy, Chelsea, Jasper, and Daniel Island 603 AM EDT Sat Jul 31 2021 ...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 8 PM EDT THIS EVENING... * WHAT...Heat index values 110 to 113 possible. * WHERE...Portions of Southeast South Carolina and Southeast Georgia, mainly along and east of I-95. This includes the Charleston and Savannah Metro Areas. * WHEN...From 11 AM this morning to 8 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Isolated to scattered afternoon thunderstorms could bring relief to some locations during the afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$
334 WWUS72 KCHS 311344 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 944 AM EDT Sat Jul 31 2021 GAZ101-116>119-137>141-SCZ043>045-047>052-312145- /O.CON.KCHS.HT.Y.0002.210731T1500Z-210801T0000Z/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham- Coastal Chatham-Long-Inland Liberty-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Inland Colleton-Dorchester- Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Rincon, Springfield, Pembroke, Richmond Hill, Fort Mcallister, Oak Level, Garden City, Pooler, Savannah, Wilmington Island, Tybee Island, Ludowici, Hinesville, Fort Stewart, Townsend, Darien, Walterboro, Saint George, Summerville, Goose Creek, Moncks Corner, Ridgeland, Beaufort, Hilton Head Island, Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy, Chelsea, Jasper, and Daniel Island 944 AM EDT Sat Jul 31 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 113 expected. * WHERE...Portions of southeast South Carolina and southeast Georgia, mainly along and east of I-95, including the Charleston, Beaufort and Savannah areas. * WHEN...Until 8 PM EDT this evening, with the worst conditions generally from around 1 to 5 PM. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Isolated to scattered afternoon thunderstorms could bring relief to some locations during the afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$
163 WWUS72 KCHS 311920 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 320 PM EDT Sat Jul 31 2021 GAZ101-116>119-137>141-SCZ043>045-047>052-010000- /O.CON.KCHS.HT.Y.0002.000000T0000Z-210801T0000Z/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham- Coastal Chatham-Long-Inland Liberty-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Inland Colleton-Dorchester- Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Rincon, Springfield, Pembroke, Richmond Hill, Fort Mcallister, Oak Level, Garden City, Pooler, Savannah, Wilmington Island, Tybee Island, Ludowici, Hinesville, Fort Stewart, Townsend, Darien, Walterboro, Saint George, Summerville, Goose Creek, Moncks Corner, Ridgeland, Beaufort, Hilton Head Island, Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy, Chelsea, Jasper, and Daniel Island 320 PM EDT Sat Jul 31 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 114. * WHERE...Portions of southeast South Carolina and southeast Georgia, mainly along and east of I-95, including the Charleston, Beaufort and Savannah areas. * WHEN...Until 8 PM EDT this evening, with the worst conditions until about 5 PM. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Isolated to scattered showers and storms will bring relief to some locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. 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. && $$
818 WWUS72 KCHS 312129 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 529 PM EDT Sat Jul 31 2021 SCZ043>045-049-050-052-312230- /O.CAN.KCHS.HT.Y.0002.000000T0000Z-210801T0000Z/ Inland Colleton-Dorchester-Inland Berkeley-Coastal Colleton- Charleston-Tidal Berkeley- Including the cities of Walterboro, Saint George, Summerville, Goose Creek, Moncks Corner, Edisto Beach, Charleston, North Charleston, Mount Pleasant, and Daniel Island 529 PM EDT Sat Jul 31 2021 ...HEAT ADVISORY IS CANCELLED... Showers and thunderstorms have reduced the coverage of heat indices of 110 degrees or greater. $$ GAZ101-116>119-137>141-SCZ047-048-051-010000- /O.CON.KCHS.HT.Y.0002.000000T0000Z-210801T0000Z/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham- Coastal Chatham-Long-Inland Liberty-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Inland Jasper-Beaufort- Coastal Jasper- Including the cities of Rincon, Springfield, Pembroke, Richmond Hill, Fort Mcallister, Oak Level, Garden City, Pooler, Savannah, Wilmington Island, Tybee Island, Ludowici, Hinesville, Fort Stewart, Townsend, Darien, Ridgeland, Beaufort, Hilton Head Island, Levy, Chelsea, and Jasper 529 PM EDT Sat Jul 31 2021 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heat index values up to 113. * WHERE...Portions of southeast South Carolina and southeast Georgia, mainly along and east of I-95, including the Charleston, Beaufort and Savannah areas. * WHEN...Until 8 PM EDT this evening, with the worst conditions early this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS...Isolated to scattered showers and storms will bring relief to some locations. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sunshine, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. && $$
704 WWUS72 KCHS 312345 NPWCHS URGENT - WEATHER MESSAGE National Weather Service Charleston SC 745 PM EDT Sat Jul 31 2021 GAZ101-116>119-137>141-SCZ047-048-051-010045- /O.CAN.KCHS.HT.Y.0002.000000T0000Z-210801T0000Z/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham- Coastal Chatham-Long-Inland Liberty-Coastal Liberty- Inland McIntosh-Coastal McIntosh-Inland Jasper-Beaufort- Coastal Jasper- Including the cities of Rincon, Springfield, Pembroke, Richmond Hill, Fort Mcallister, Oak Level, Garden City, Pooler, Savannah, Wilmington Island, Tybee Island, Ludowici, Hinesville, Fort Stewart, Townsend, Darien, Ridgeland, Beaufort, Hilton Head Island, Levy, Chelsea, and Jasper 745 PM EDT Sat Jul 31 2021 ...HEAT ADVISORY IS CANCELLED... $$
The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 3:25 PM EDT | Special Weather Statement | CHS | Charleston | 35 min |
| Jul 31, 3:50 PM EDT | Areal Flood Advisory | CHS | Berkeley, Charleston | 115 min |
| Jul 31, 4:00 PM EDT | Special Weather Statement | CHS | Berkeley | 30 min |
| Jul 31, 4:01 PM EDT | Small Craft Advisory | CHS | 32 hr | |
| Jul 31, 4:06 PM EDT | Special Weather Statement | CHS | Berkeley | 24 min |
| Jul 31, 4:29 PM EDT | Special Weather Statement | CHS | Colleton | 31 min |
| Jul 31, 4:38 PM EDT | Special Weather Statement | CHS | Charleston | 37 min |
| Jul 31, 4:51 PM EDT | Special Marine Warning | CHS | 57 min | |
| Jul 31, 4:53 PM EDT | Special Weather Statement | CHS | Charleston | 37 min |
| Jul 31, 5:04 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Charleston | 34 min |
| Jul 31, 5:11 PM EDT | Areal Flood Advisory | CHS | Berkeley, Charleston | 36 min |
| Jul 31, 5:26 PM EDT | Special Weather Statement | CHS | Berkeley | 34 min |
| Jul 31, 5:37 PM EDT | Special Weather Statement | CHS | Colleton | 23 min |
| Jul 31, 5:59 PM EDT | Special Weather Statement | CHS | Colleton | 31 min |
| Jul 31, 6:02 PM EDT | Special Weather Statement | CHS | Berkeley | 28 min |
| Jul 31, 6:38 PM EDT | Special Weather Statement | CHS | Berkeley | 37 min |
| Jul 31, 6:46 PM EDT | Special Weather Statement | CHS | Dorchester | 29 min |
Nearby
Heat Advisories in South Carolina, 2021Heat Advisories in Georgia, 2021Every heat advisory in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.