Alert archive / South Carolina / Areal Flood Advisories in 2021
Areal Flood Advisory 99, NWS Charleston, SC
NWS Charleston, SC issued this areal flood advisory at Aug 19, 2021, 5:35 PM EDT for Berkeley County, Charleston County, Dorchester County, South Carolina. It was in force for 115 min.
The area
The counties it named.
The facts
- Issued
- Aug 19, 2021, 5:35 PM EDT (21:35 UTC)
- Expired
- Aug 19, 2021, 7:30 PM EDT
- In force
- 115 min
- Issued by
- NWS Charleston, SC
- Area
- Storm-based polygon
Counties Berkeley County, SC, Charleston County, SC, Dorchester County, SC
The radar
The Charleston,SC radar (KCLX), 96 km from the middle of the area, began a volume at 21:35 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
Jacksonville, FL (KJAX), launched 12:00Z, 9.6 hours before the alert went out and 317 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
- 1604 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 844 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Charleston, SC wrote its last area forecast discussion before this areal flood advisory went out at Aug 19, 4:00 PM EDT, 1 hour 35 minutes earlier.
Area forecast discussion, Aug 19, 4:00 PM EDT, 1 hour 35 minutes before
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</html>Hazardous weather outlook, Aug 19, 3:41 PM EDT, 1 hour 54 minutes before
Hazardous Weather Outlook National Weather Service Charleston SC 341 PM EDT Thu Aug 19 2021 AMZ330-350-352-354-374-201945- Charleston Harbor- Waters from South Santee River to Edisto Beach SC out 20 NM- Waters from Edisto Beach SC to Savannah GA out 20 NM- Waters from Savannah GA to Altamaha Sound GA out 20 NM, including Grays Reef National Marine Sanctuary- Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM- 341 PM EDT Thu Aug 19 2021 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. GAZ087-088-099>101-114>116-118-137-138-140-SCZ040-042>045-047-052- 201945- Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans- Inland Bryan-Inland Chatham-Long-Inland Liberty-Inland McIntosh- Allendale-Hampton-Inland Colleton-Dorchester-Inland Berkeley- Inland Jasper-Tidal Berkeley- 341 PM EDT Thu Aug 19 2021 This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. SCZ049-050-201945- Coastal Colleton-Charleston- 341 PM EDT Thu Aug 19 2021 ...MODERATE RISK FOR RIP CURRENTS IN EFFECT THROUGH FRIDAY EVENING... This Hazardous Weather Outlook is for southeast South Carolina. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Moderate Risk for Rip Currents. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Moderate Risk for Rip Currents. Coastal Flooding...Tide levels are forecast to reach marginal Coastal Flood Advisory levels around Charleston during the Friday night high tide and possibly Saturday night as well, mainly due to the full moon and swells from tropical cyclone Henri well offshore. Thus, minor coastal flooding will be possible, with flooding being exacerbated if heavy rain falls around the same time. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. GAZ117-119-139-141-SCZ048-051-201945- Coastal Bryan-Coastal Chatham-Coastal Liberty-Coastal McIntosh- Beaufort-Coastal Jasper- 341 PM EDT Thu Aug 19 2021 ...MODERATE RISK FOR RIP CURRENTS IN EFFECT THROUGH FRIDAY EVENING... This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Moderate Risk for Rip Currents. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Moderate Risk for Rip Currents. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time.
In the hours before
Local storm report, Aug 19, 4:23 PM EDT, 1 hour 12 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
423 PM EDT THU AUG 19 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0200 PM RIP CURRENTS TYBEE ISLAND 31.99N 80.85W
08/19/2021 CHATHAM GA LIFEGUARD
NUMEROUS RIP CURRENTS HAVE BEEN SPOTTED BY THE TYBEE
ISLAND LIFEGUARDS THROUGHOUT THE AFTERNOON SOUTH OF 7TH
STREET. THERE WERE THREE ASSISTS JUST SOUTH OF THE PIER
AROUND 2 PM WITH NO INJURIES REPORTED.
&&
EVENT NUMBER CHS2100573The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 6:12 PM EDT | Areal Flood Advisory | CHS | Charleston | 60 min |
| Aug 19, 6:25 PM EDT | Special Weather Statement | CHS | Dorchester | 35 min |
| Aug 19, 6:31 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley, Dorchester | 59 min |
| Aug 19, 6:55 PM EDT | Special Weather Statement | CHS | Berkeley | 35 min |
| Aug 19, 7:08 PM EDT | Special Weather Statement | CHS | Berkeley | 37 min |
| Aug 19, 7:28 PM EDT | Special Weather Statement | CHS | Berkeley | 32 min |
| Aug 19, 7:45 PM EDT | Special Weather Statement | CHS | Berkeley | 30 min |
| Aug 19, 7:57 PM EDT | Special Weather Statement | CHS | Berkeley | 33 min |
Nearby
Areal Flood Advisories in South Carolina, 2021Every areal flood 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.