Alert archive / Georgia / Flash Flood Watches in 2009

Flash Flood Watch 6, NWS Charleston, SC

December 13, 20098 counties in Georgia; Allendale County, Hampton County, South Carolina

NWS Charleston, SC issued this flash flood watch at Dec 13, 2009, 9:44 AM EST for 8 counties in Georgia; Allendale County, Hampton County, South Carolina. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Dec 13, 2009, 9:44 AM EST (14:44 UTC)
Expired: Dec 13, 2009, 1:28 PM EST
In force: 4 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, Hampton County, SC

The radar

The Charleston,SC radar (KCLX), 65 km from the middle of the area, began a volume at 14:48 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 12:00Z, 2.7 hours before the alert went out and 282 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 396 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 561 m²/s²
0-3 km storm-relative helicity: 548 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Dec 13, 6:58 AM EST, 2 hours 46 minutes earlier.

Area forecast discussion, Dec 13, 6:58 AM EST, 2 hours 46 minutes before

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Hazardous weather outlook, Dec 13, 4:35 AM EST, 5 hours 9 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
Dec 12, 10:28 PM EST	River Flood Warning	CHS	Bryan, Chatham, Effingham	6 days
Dec 13, 4:46 AM EST	River Flood Warning	CHS	Tattnall, Toombs	6 days
Dec 13, 10:22 AM EST	Areal Flood Advisory	CHS	Bulloch, Candler, Jenkins, Screven	83 min
Dec 13, 10:51 AM EST	River Flood Warning	CHS	Evans	10 days
Dec 13, 11:42 AM EST	Areal Flood Advisory	CHS	Bulloch, Candler, Jenkins, Screven	78 min
Dec 13, 2:14 PM EST	Marine Dense Fog Advisory	CHS		44 hr

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.