Alert archive / South Carolina / Areal Flood Advisories in 2021
Areal Flood Advisory 95, NWS Charleston, SC
NWS Charleston, SC issued this areal flood advisory at Aug 18, 2021, 5:39 AM EDT for Charleston County, South Carolina. It was in force for 111 min.
The area
The counties it named.
The facts
- Issued
- Aug 18, 2021, 5:39 AM EDT (09:39 UTC)
- Expired
- Aug 18, 2021, 7:30 AM EDT
- In force
- 111 min
- Issued by
- NWS Charleston, SC
- Area
- Storm-based polygon
County Charleston County, SC
The radar
The Charleston,SC radar (KCLX), 103 km from the middle of the area, began a volume at 09:42 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, 9.7 hours before the alert went out and 18 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
- 1990 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 710 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 71 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.0
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 18, 5:32 AM EDT, 7 minutes earlier.
Area forecast discussion, Aug 18, 5:32 AM EDT, 7 minutes before
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</html>Hazardous weather outlook, Aug 18, 3:46 AM EDT, 1 hour 53 minutes before
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
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The site you requested is temporarily down for maintenance or an unexpected outage.
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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 |
|---|---|---|---|---|
| Aug 17, 9:43 PM EDT | Small Craft Advisory | CHS | 3 hr | |
| Aug 18, 6:04 AM EDT | Special Marine Warning | CHS | 56 min | |
| Aug 18, 5:35 PM EDT | Areal Flood Advisory | CHS | Berkeley, Charleston, Dorchester | 103 min |
| Aug 18, 6:09 PM EDT | Areal Flood Advisory | CHS | Berkeley | 69 min |
| Aug 18, 6:25 PM EDT | Areal Flood Advisory | CHS | Beaufort, Jasper | 2 hr |
| Aug 18, 6:44 PM EDT | Special Weather Statement | CHS | Liberty | 31 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.