Alert archive / South Carolina / Flash Flood Watches in 2021
Flash Flood Watch 5, NWS Charleston, SC
NWS Charleston, SC issued this flash flood watch at Aug 22, 2021, 3:07 PM EDT for Berkeley County, Colleton County, Dorchester County, South Carolina. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Aug 22, 2021, 3:07 PM EDT (19:07 UTC)
- Expired
- Aug 22, 2021, 7:39 PM EDT
- In force
- 5 hr
- Issued by
- NWS Charleston, SC
- Flood severity
- None
Counties Berkeley County, SC, Colleton County, SC, Dorchester County, SC
The radar
The Charleston,SC radar (KCLX), 79 km from the middle of the area, began a volume at 19:06 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 12:00Z, 7.1 hours before the alert went out and 35 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
- 890 J/kg
- Mixed-layer CIN
- -34 J/kg
- Mixed-layer LCL
- 704 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted.
976 WGUS62 KCHS 221907 FFACHS URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Charleston SC 307 PM EDT Sun Aug 22 2021 SCZ043>045-049-050-052-230200- /O.NEW.KCHS.FF.A.0005.210822T1907Z-210823T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Inland Colleton-Dorchester-Inland Berkeley-Coastal Colleton- Charleston-Tidal Berkeley- Including the cities of Mount Pleasant, North Charleston, Edisto Beach, Saint George, Summerville, Moncks Corner, Walterboro, Daniel Island, Goose Creek, and Charleston 307 PM EDT Sun Aug 22 2021 ...FLASH FLOOD WATCH IN EFFECT UNTIL 10 PM EDT THIS EVENING... The National Weather Service in Charleston has issued a * Flash Flood Watch for a portion of southeast South Carolina, including the following areas, Charleston, Coastal Colleton, Dorchester, Inland Berkeley, Inland Colleton and Tidal Berkeley. * Until 10 PM EDT this evening. * Widespread showers and thunderstorms with torrential rainfall will impact much the Charleston Tri-County area and Colleton County this evening. Rainfall amounts of 1 to 3 inches with localized amounts in excess of 5 inches could fall, possibly in less than 2 hours. This combined with wet soils from recent heavy rains could result in areas of 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. && $$
1 follow-up statement
855 WGUS62 KCHS 222339 FFACHS Flood Watch National Weather Service Charleston SC 739 PM EDT Sun Aug 22 2021 SCZ043>045-049-050-052-230045- /O.CAN.KCHS.FF.A.0005.000000T0000Z-210823T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Inland Colleton-Dorchester-Inland Berkeley-Coastal Colleton- Charleston-Tidal Berkeley- Including the cities of Mount Pleasant, North Charleston, Edisto Beach, Saint George, Summerville, Moncks Corner, Walterboro, Daniel Island, Goose Creek, and Charleston 739 PM EDT Sun Aug 22 2021 ...FLASH FLOOD WATCH IS CANCELLED... The Flash Flood Watch for a portion of southeast South Carolina, including the following areas, Charleston, Coastal Colleton, Dorchester, Inland Berkeley, Inland Colleton and Tidal Berkeley has been cancelled. The Flood Watch is cancelled. Flash flooding is no longer expected to pose a threat. $$ BSH
The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 9:46 PM EDT | Areal Flood Advisory | CHS | Allendale, Hampton | 3 hr |
| Aug 22, 8:43 AM EDT | Special Marine Warning | CHS | 47 min | |
| Aug 22, 1:41 PM EDT | Special Marine Warning | CHS | 94 min | |
| Aug 22, 2:35 PM EDT | Special Marine Warning | CHS | 55 min | |
| Aug 22, 4:50 PM EDT | Special Marine Warning | CHS | 115 min | |
| Aug 22, 5:24 PM EDT | Special Marine Warning | CHS | 2 hr | |
| Aug 22, 5:45 PM EDT | Special Marine Warning | CHS | 2 hr | |
| Aug 22, 7:01 PM EDT | Special Marine Warning | CHS | 119 min | |
| Aug 22, 7:32 PM EDT | Special Marine Warning | CHS | 118 min |
Nearby
Flash Flood Watches in South Carolina, 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.