Alert archive / South Carolina / Flash Flood Warnings in 2025

Flash Flood Warning 11, NWS Charleston, SC

August 9, 2025Charleston County, South Carolina

NWS Charleston, SC issued this flash flood warning at Aug 9, 2025, 8:53 PM EDT for Charleston County, South Carolina. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 9, 2025, 8:53 PM EDT (00:53 UTC)
Expired: Aug 10, 2025, 12:00 AM EDT
In force: 3 hr
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Flood severity: None

County Charleston County, SC

The radar

The Charleston,SC radar (KCLX), 103 km from the middle of the area, began a volume at 00:57 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

Newport, NC (KMHX), launched 00:00Z, 0.9 hours before the alert went out and 362 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 18 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 873 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: -6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 flash flood warning went out at Aug 9, 7:43 PM EDT, 1 hour 10 minutes earlier.

Area forecast discussion, Aug 9, 7:43 PM EDT, 1 hour 10 minutes before

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Hazardous weather outlook, Aug 9, 7:26 PM EDT, 1 hour 27 minutes before

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In the hours before

Local storm report, Aug 9, 3:09 PM EDT, 5 hours 44 minutes before

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Local storm report, Aug 9, 3:28 PM EDT, 5 hours 25 minutes before

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The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 12:46 AM EDT	Flood Watch	CHS	Effingham	41 hr
Aug 10, 4:48 AM EDT	Areal Flood Advisory	CHS	Effingham	3 hr
Aug 10, 4:53 AM EDT	Areal Flood Advisory	CHS	Liberty, McIntosh	82 min
Aug 10, 7:06 AM EDT	Areal Flood Advisory	CHS	Liberty, Long, McIntosh	114 min
Aug 9, 11:42 PM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston	2 hr
Aug 10, 4:12 AM EDT	Areal Flood Advisory	CHS	Beaufort, Jasper	5 hr
Aug 10, 7:31 AM EDT	Areal Flood Advisory	CHS	Beaufort, Jasper	119 min
Aug 10, 10:08 AM EDT	River Flood Warning	CHS	Berkeley, Georgetown, Williamsburg	3 days
Aug 10, 1:37 PM EDT	Coastal Flood Advisory	CHS		9 hr

Nearby

Flash Flood Warnings in South Carolina, 2025 Every flash flood warning in 2025

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.