Alert archive / South Carolina / Areal Flood Advisories in 2021
Areal Flood Advisory 65, NWS Charleston, SC
NWS Charleston, SC issued this areal flood advisory at Jul 20, 2021, 12:57 PM EDT for 4 counties in South Carolina. It was in force for 108 min.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2021, 12:57 PM EDT (16:57 UTC)
- Expired
- Jul 20, 2021, 2:45 PM EDT
- In force
- 108 min
- Issued by
- NWS Charleston, SC
- Area
- Storm-based polygon
Counties Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC
The radar
The Charleston,SC radar (KCLX), 83 km from the middle of the area, began a volume at 17:00 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, 5.0 hours before the alert went out and 23 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
- 310 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 743 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 31 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 Jul 20, 10:13 AM EDT, 2 hours 44 minutes earlier.
Area forecast discussion, Jul 20, 10:13 AM EDT, 2 hours 44 minutes before
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</html>Hazardous weather outlook, Jul 20, 4:32 AM EDT, 8 hours 25 minutes before
Hazardous Weather Outlook National Weather Service Charleston SC 432 AM EDT Tue Jul 20 2021 GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>052-210845- Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans- Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham-Long- Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh- Allendale-Hampton-Inland Colleton-Dorchester-Inland Berkeley- Inland Jasper-Beaufort-Coastal Colleton-Charleston-Coastal Jasper- Tidal Berkeley- 432 AM EDT Tue Jul 20 2021 This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...Today and tonight. Excessive Rainfall: Numerous to widespread thunderstorms will develop across portions of the South Carolina Lowcountry and Southeast Georgia this afternoon and evening. Minor flooding of low-lying and poor drainage areas is possible. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. AMZ330-350-352-354-374-210845- 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- 432 AM EDT Tue Jul 20 2021 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...Today and tonight. Strong Thunderstorms: Clusters of thunderstorms are expected to push across the nearshore and outer South Carolina and Georgia waters late this afternoon and evening. These thunderstorms may produce swaths of wind gusts of 35 knots or greater and excessive lightning. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time.
In the hours before
Local storm report, Jul 20, 9:08 AM EDT, 3 hours 49 minutes before
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</html>Local storm report, Jul 20, 10:31 AM EDT, 2 hours 26 minutes before
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</html>Local storm report, Jul 20, 10:33 AM EDT, 2 hours 24 minutes before
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</html>Local storm report, Jul 20, 10:35 AM EDT, 2 hours 22 minutes before
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</html>Local storm report, Jul 20, 10:37 AM EDT, 2 hours 20 minutes before
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Please try again in a few minutes.
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</html>The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 8:32 PM EDT | Special Marine Warning | CHS | 118 min | |
| Jul 20, 10:28 AM EDT | Special Marine Warning | CHS | 2 hr | |
| Jul 20, 10:32 AM EDT | Special Marine Warning | CHS | 118 min | |
| Jul 20, 1:30 PM EDT | Special Marine Warning | CHS | 54 min | |
| Jul 20, 2:23 PM EDT | Special Marine Warning | CHS | 97 min | |
| Jul 20, 2:47 PM EDT | Areal Flood Advisory | CHS | Berkeley, Charleston, Dorchester | 58 min |
| Jul 20, 3:41 PM EDT | Special Marine Warning | CHS | 68 min | |
| Jul 20, 7:39 PM EDT | Special Weather Statement | CHS | Screven | 36 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.