Alert archive / Georgia / Flash Flood Watches in 2009

Flash Flood Watch 5, NWS Charleston, SC

August 13, 20098 counties in Georgia; 5 counties in South Carolina

NWS Charleston, SC issued this flash flood watch at Aug 13, 2009, 3:26 AM EDT for 8 counties in Georgia; 5 counties in South Carolina. It was in force for 36 hr.

The area

The counties it named.

The facts

Issued: Aug 13, 2009, 3:26 AM EDT (07:26 UTC)
Expired: Aug 14, 2009, 3:05 PM EDT
In force: 36 hr
Issued by: NWS Charleston, SC
Flood severity: None

Counties Bulloch County, GA, Candler County, GA, Effingham County, GA, Evans County, GA, Jenkins County, GA, Long County, GA, Screven County, GA, Tattnall County, GA, Allendale County, SC, Berkeley County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC

The radar

The Charleston,SC radar (KCLX), 33 km from the middle of the area, began a volume at 07:26 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 7.4 hours before the alert went out and 304 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: 978 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 1092 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -1.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at Aug 12, 7:49 PM EDT, 7 hours 37 minutes earlier.

Area forecast discussion, Aug 12, 7:49 PM EDT, 7 hours 37 minutes before

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Hazardous weather outlook, Aug 12, 7:16 PM EDT, 8 hours 10 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 12, 8:16 PM EDT	Special Marine Warning	CHS		94 min
Aug 13, 5:13 PM EDT	Special Marine Warning	CHS		92 min
Aug 13, 5:44 PM EDT	Areal Flood Advisory	CHS	McIntosh	91 min
Aug 13, 6:07 PM EDT	Areal Flood Advisory	CHS	Chatham	83 min

Nearby

Flash Flood Watches in Georgia, 2009 Flash Flood Watches in South Carolina, 2009 Every flash flood watch in 2009

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.