Alert archive / South Carolina / Flash Flood Watches in 2021
Flash Flood Watch 6, NWS Charleston, SC
NWS Charleston, SC issued this flash flood watch at Sep 20, 2021, 3:16 AM EDT for 4 counties in South Carolina; Effingham County, Georgia. It was in force for 36 hr.
The area
The counties it named.
The facts
- Issued
- Sep 20, 2021, 3:16 AM EDT (07:16 UTC)
- Expired
- Sep 21, 2021, 2:49 PM EDT
- In force
- 36 hr
- Issued by
- NWS Charleston, SC
- Flood severity
- None
Counties Effingham County, GA, Berkeley County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC
The radar
The Charleston,SC radar (KCLX), 39 km from the middle of the area, began a volume at 07:14 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, 7.3 hours before the alert went out and 65 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
- 75 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 1011 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- 3 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
352 WGUS62 KCHS 200716 FFACHS URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Charleston SC 316 AM EDT Mon Sep 20 2021 GAZ101-116>119-138>141-SCZ042>045-047>052-201530- /O.NEW.KCHS.FF.A.0006.210920T0716Z-210921T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham- Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Hampton-Inland Colleton-Dorchester-Inland Berkeley-Inland Jasper- Beaufort-Coastal Colleton-Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Edisto Beach, Mount Pleasant, Walterboro, Charleston, Townsend, Fort Stewart, Levy, Daniel Island, Tybee Island, Rincon, Hilton Head Island, Richmond Hill, Springfield, Summerville, Garden City, Beaufort, Pembroke, North Charleston, Yemassee, Ridgeland, Pooler, Goose Creek, Hinesville, Chelsea, Hampton, Oak Level, Saint George, Savannah, Moncks Corner, Wilmington Island, Jasper, Fort Mcallister, and Darien 316 AM EDT Mon Sep 20 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... The National Weather Service in Charleston has issued a * Flash Flood Watch for portions of southeast Georgia and southeast South Carolina, including the following areas, in southeast Georgia, Coastal Bryan, Coastal Chatham, Coastal Liberty, Coastal McIntosh, Effingham, Inland Bryan, Inland Chatham, Inland Liberty and Inland McIntosh. In southeast South Carolina, Beaufort, Charleston, Coastal Colleton, Coastal Jasper, Dorchester, Hampton, Inland Berkeley, Inland Colleton, Inland Jasper and Tidal Berkeley. * Through late tonight. * Widespread showers and isolated thunderstorms with torrential rain will overspread much of Southeast South Carolina and Southeast Georgia today and tonight. Rainfall amounts of 2 to 4 inches with localized amounts in excess of 6 inches could fall through 6 AM Tuesday. This could result in pockets of flash flooding. The risk for flash flooding could become enhanced along the coast during high tide this morning and again this evening where tide levels are already elevated. This includes both the Charleston and Savannah Metro Areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$
7 follow-up statements
755 WGUS62 KCHS 201020 FFACHS Flood Watch National Weather Service Charleston SC 620 AM EDT Mon Sep 20 2021 GAZ101-116>119-138>141-SCZ042>045-047>052-201830- /O.CON.KCHS.FF.A.0006.000000T0000Z-210921T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham- Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Hampton-Inland Colleton-Dorchester-Inland Berkeley-Inland Jasper- Beaufort-Coastal Colleton-Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Edisto Beach, Mount Pleasant, Walterboro, Charleston, Townsend, Fort Stewart, Levy, Daniel Island, Tybee Island, Rincon, Hilton Head Island, Richmond Hill, Springfield, Summerville, Garden City, Beaufort, Pembroke, North Charleston, Yemassee, Ridgeland, Pooler, Goose Creek, Hinesville, Chelsea, Hampton, Oak Level, Saint George, Savannah, Moncks Corner, Wilmington Island, Jasper, Fort Mcallister, and Darien 620 AM EDT Mon Sep 20 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of southeast Georgia and southeast South Carolina, including the following areas, in southeast Georgia, Coastal Bryan, Coastal Chatham, Coastal Liberty, Coastal McIntosh, Effingham, Inland Bryan, Inland Chatham, Inland Liberty and Inland McIntosh. In southeast South Carolina, Beaufort, Charleston, Coastal Colleton, Coastal Jasper, Dorchester, Hampton, Inland Berkeley, Inland Colleton, Inland Jasper and Tidal Berkeley. * Through late tonight. * Widespread showers and isolated thunderstorms with torrential rain will overspread much of Southeast South Carolina and Southeast Georgia today and tonight. Rainfall amounts of 2 to 4 inches with localized amounts in excess of 6 inches could fall through 6 AM Tuesday. This could result in pockets of flash flooding. The risk for flash flooding could become enhanced along the coast during high tide this morning and again this evening where tide levels are already elevated. This includes both the Charleston and Savannah Metro Areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be prepared to protect life and property, especially in areas prone to flooding. If flooding develops, move to higher ground immediately. If driving, be prepared for flooded roadways and possible road closures. && $$
233 WGUS62 KCHS 201713 FFACHS Flood Watch National Weather Service Charleston SC 113 PM EDT Mon Sep 20 2021 GAZ101-116>119-138>141-SCZ042>045-047>052-210115- /O.CON.KCHS.FF.A.0006.000000T0000Z-210921T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham- Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Hampton-Inland Colleton-Dorchester-Inland Berkeley-Inland Jasper- Beaufort-Coastal Colleton-Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Edisto Beach, Mount Pleasant, Walterboro, Charleston, Townsend, Fort Stewart, Levy, Daniel Island, Tybee Island, Rincon, Hilton Head Island, Richmond Hill, Springfield, Summerville, Garden City, Beaufort, Pembroke, North Charleston, Yemassee, Ridgeland, Pooler, Goose Creek, Hinesville, Chelsea, Hampton, Oak Level, Saint George, Savannah, Moncks Corner, Wilmington Island, Jasper, Fort Mcallister, and Darien 113 PM EDT Mon Sep 20 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of southeast Georgia and southeast South Carolina, including the following areas, in southeast Georgia, Coastal Bryan, Coastal Chatham, Coastal Liberty, Coastal McIntosh, Effingham, Inland Bryan, Inland Chatham, Inland Liberty and Inland McIntosh. In southeast South Carolina, Beaufort, Charleston, Coastal Colleton, Coastal Jasper, Dorchester, Hampton, Inland Berkeley, Inland Colleton, Inland Jasper and Tidal Berkeley. * Through late tonight. * Widespread showers and a few thunderstorms will continue to impact southeast South Carolina and southeast Georgia through tonight. Overall rainfall amounts of 2 to 4 inches are expected through 6 am Tuesday with localized amounts up to 6 inches possible. The risk for flooding may be enhanced along the coast during high tide this evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be prepared to protect life and property, especially in areas prone to flooding. If flooding develops, move to higher ground immediately. If driving, be prepared for flooded roadways and possible road closures. && $$
364 WGUS62 KCHS 202006 FFACHS Flood Watch National Weather Service Charleston SC 406 PM EDT Mon Sep 20 2021 GAZ101-116>119-138>141-SCZ042>045-047>052-210415- /O.CON.KCHS.FF.A.0006.000000T0000Z-210921T1000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham- Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Hampton-Inland Colleton-Dorchester-Inland Berkeley-Inland Jasper- Beaufort-Coastal Colleton-Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Edisto Beach, Mount Pleasant, Walterboro, Charleston, Townsend, Fort Stewart, Levy, Daniel Island, Tybee Island, Rincon, Hilton Head Island, Richmond Hill, Springfield, Summerville, Garden City, Beaufort, Pembroke, North Charleston, Yemassee, Ridgeland, Pooler, Goose Creek, Hinesville, Chelsea, Hampton, Oak Level, Saint George, Savannah, Moncks Corner, Wilmington Island, Jasper, Fort Mcallister, and Darien 406 PM EDT Mon Sep 20 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... The Flash Flood Watch continues for * Portions of southeast Georgia and southeast South Carolina, including the following areas, in southeast Georgia, Coastal Bryan, Coastal Chatham, Coastal Liberty, Coastal McIntosh, Effingham, Inland Bryan, Inland Chatham, Inland Liberty and Inland McIntosh. In southeast South Carolina, Beaufort, Charleston, Coastal Colleton, Coastal Jasper, Dorchester, Hampton, Inland Berkeley, Inland Colleton, Inland Jasper and Tidal Berkeley. * Through late tonight. * Widespread showers and a few thunderstorms will continue to impact southeast South Carolina and southeast Georgia through tonight. Overall rainfall amounts of 2 to 4 inches are expected through 6 am Tuesday with localized amounts up to 6 inches possible. The risk for flooding may be enhanced along the coast during high tide this evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be prepared to protect life and property, especially in areas prone to flooding. If flooding develops, move to higher ground immediately. If driving, be prepared for flooded roadways and possible road closures. && $$
997 WGUS62 KCHS 202339 FFACHS URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Charleston SC 739 PM EDT Mon Sep 20 2021 GAZ101-116>119-138>141-SCZ042>045-047>052-210745- /O.EXT.KCHS.FF.A.0006.000000T0000Z-210921T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Effingham-Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham- Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Hampton-Inland Colleton-Dorchester-Inland Berkeley-Inland Jasper- Beaufort-Coastal Colleton-Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Edisto Beach, Mount Pleasant, Walterboro, Charleston, Townsend, Fort Stewart, Levy, Daniel Island, Tybee Island, Rincon, Hilton Head Island, Richmond Hill, Springfield, Summerville, Garden City, Beaufort, Pembroke, North Charleston, Yemassee, Ridgeland, Pooler, Goose Creek, Hinesville, Chelsea, Hampton, Oak Level, Saint George, Savannah, Moncks Corner, Wilmington Island, Jasper, Fort Mcallister, and Darien 739 PM EDT Mon Sep 20 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH TUESDAY MORNING... The Flash Flood Watch is now in effect for * Portions of southeast Georgia and southeast South Carolina, including the following areas, in southeast Georgia, Coastal Bryan, Coastal Chatham, Coastal Liberty, Coastal McIntosh, Effingham, Inland Bryan, Inland Chatham, Inland Liberty and Inland McIntosh. In southeast South Carolina, Beaufort, Charleston, Coastal Colleton, Coastal Jasper, Dorchester, Hampton, Inland Berkeley, Inland Colleton, Inland Jasper and Tidal Berkeley. * Through Tuesday morning. * Rounds of heavy rainfall producing showers, and possibly a thunderstorm or two, will continue to impact much of southeast Georgia and southeast South Carolina through Tuesday morning. Additional rainfall amounts of 2 to 4 inches will be possible, with locally higher amounts possible. The risk for flash flooding could be enhanced along the coast during high tide, especially along the Charleston County coast with the high tide around 9 am Tuesday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be prepared to protect life and property, especially in areas prone to flooding. If flooding develops, move to higher ground immediately. If driving, be prepared for flooded roadways and possible road closures. && $$ BSH
002 WGUS62 KCHS 210724 FFACHS URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Charleston SC 324 AM EDT Tue Sep 21 2021 GAZ116-117-138>141-210830- /O.CAN.KCHS.FF.A.0006.000000T0000Z-210921T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Inland Bryan-Coastal Bryan-Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Including the cities of Pembroke, Oak Level, Richmond Hill, Fort Mcallister, Hinesville, Darien, Townsend, and Fort Stewart 324 AM EDT Tue Sep 21 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of Southeast Georgia, including the following areas, Coastal Bryan, Coastal Liberty, Coastal McIntosh, Inland Bryan, Inland Liberty and Inland McIntosh has been cancelled. The risk for flash flooding has ended. Localized flooding could still occur today into this evening, mainly in low-lying and poor drainage areas. $$ GAZ101-118-119-SCZ042>045-047>052-211530- /O.EXT.KCHS.FF.A.0006.000000T0000Z-210922T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Effingham-Inland Chatham-Coastal Chatham-Hampton-Inland Colleton- Dorchester-Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Edisto Beach, Mount Pleasant, Walterboro, Springfield, Levy, Daniel Island, Tybee Island, Rincon, Hilton Head Island, Summerville, Garden City, Beaufort, North Charleston, Yemassee, Ridgeland, Pooler, Goose Creek, Charleston, Chelsea, Hampton, Saint George, Savannah, Moncks Corner, Wilmington Island, and Jasper 324 AM EDT Tue Sep 21 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch is now in effect for * Portions of southeast Georgia and southeast South Carolina, including the following areas, in southeast Georgia, Coastal Chatham, Effingham and Inland Chatham. In southeast South Carolina, Beaufort, Charleston, Coastal Colleton, Coastal Jasper, Dorchester, Hampton, Inland Berkeley, Inland Colleton, Inland Jasper and Tidal Berkeley. * Through this evening. * Numerous to widespread showers with occasional thunderstorms will impact much of Southeast South Carolina into far eastern parts of Georgia through this evening. Additional rainfall amounts of 2 to 4 inches with localized amounts in excess of 5 inches are possible with 1 to 2 inches possible over portions of far eastern Georgia, including the Savannah Metro Area. Many areas observed between 2 to 5 inches of rain yesterday with some spots seeing greater than 8 inches in portions of Beaufort County. The risk for flash flooding continues. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be prepared to protect life and property, especially in areas prone to flooding. If flooding develops, move to higher ground immediately. If driving, be prepared for flooded roadways and possible road closures. && $$
211 WGUS62 KCHS 211348 FFACHS Flood Watch National Weather Service Charleston SC 948 AM EDT Tue Sep 21 2021 GAZ101-118-119-SCZ042>045-047>052-212200- /O.CON.KCHS.FF.A.0006.000000T0000Z-210922T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Effingham-Inland Chatham-Coastal Chatham-Hampton-Inland Colleton- Dorchester-Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Edisto Beach, Mount Pleasant, Walterboro, Springfield, Levy, Daniel Island, Tybee Island, Rincon, Hilton Head Island, Summerville, Garden City, Beaufort, North Charleston, Yemassee, Ridgeland, Pooler, Goose Creek, Charleston, Chelsea, Hampton, Saint George, Savannah, Moncks Corner, Wilmington Island, and Jasper 948 AM EDT Tue Sep 21 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... The Flash Flood Watch continues for * Portions of southeast Georgia and southeast South Carolina, including the following areas, in southeast Georgia, Coastal Chatham, Effingham and Inland Chatham. In southeast South Carolina, Beaufort, Charleston, Coastal Colleton, Coastal Jasper, Dorchester, Hampton, Inland Berkeley, Inland Colleton, Inland Jasper and Tidal Berkeley. * Until 8 PM EDT this evening. * Pockets of heavy rainfall will impact much of southeast South Carolina into far eastern parts of Georgia through this evening. Additional rainfall amounts of 1 to 3 inches with localized higher amounts are possible. Given the recent heavy rainfall in many areas it will not take as much additional rainfall to cause flash flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be prepared to protect life and property, especially in areas prone to flooding. If flooding develops, move to higher ground immediately. If driving, be prepared for flooded roadways and possible road closures. && $$
493 WGUS62 KCHS 211849 FFACHS Flood Watch National Weather Service Charleston SC 249 PM EDT Tue Sep 21 2021 GAZ101-118-119-SCZ042>045-047>052-212000- /O.CAN.KCHS.FF.A.0006.000000T0000Z-210922T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Effingham-Inland Chatham-Coastal Chatham-Hampton-Inland Colleton- Dorchester-Inland Berkeley-Inland Jasper-Beaufort-Coastal Colleton- Charleston-Coastal Jasper-Tidal Berkeley- Including the cities of Edisto Beach, Mount Pleasant, Walterboro, Springfield, Levy, Daniel Island, Tybee Island, Rincon, Hilton Head Island, Summerville, Garden City, Beaufort, North Charleston, Yemassee, Ridgeland, Pooler, Goose Creek, Charleston, Chelsea, Hampton, Saint George, Savannah, Moncks Corner, Wilmington Island, and Jasper 249 PM EDT Tue Sep 21 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for portions of southeast Georgia and southeast South Carolina, including the following areas, in southeast Georgia, Coastal Chatham, Effingham and Inland Chatham. In southeast South Carolina, Beaufort, Charleston, Coastal Colleton, Coastal Jasper, Dorchester, Hampton, Inland Berkeley, Inland Colleton, Inland Jasper and Tidal Berkeley has been cancelled. $$
The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 2:50 AM EDT | Coastal Flood Advisory | CHS | 7 hr | |
| Sep 20, 5:48 AM EDT | Areal Flood Advisory | CHS | Beaufort, Charleston, Colleton, Jasper | 117 min |
| Sep 20, 7:37 AM EDT | Areal Flood Advisory | CHS | Beaufort, Charleston, Colleton | 113 min |
| Sep 20, 8:56 AM EDT | Small Craft Advisory | CHS | 13 hr | |
| Sep 20, 1:30 PM EDT | Special Marine Warning | CHS | 2 hr | |
| Sep 20, 3:31 PM EDT | Special Marine Warning | CHS | 119 min | |
| Sep 20, 3:34 PM EDT | Coastal Flood Advisory | CHS | 7 hr | |
| Sep 20, 6:40 PM EDT | Areal Flood Advisory | CHS | Beaufort, Jasper | 3 hr |
| Sep 20, 7:53 PM EDT | Areal Flood Advisory | CHS | Chatham | 4 hr |
Nearby
Flash Flood Watches in South Carolina, 2021Flash Flood Watches in Georgia, 2021Every flash flood watch 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.