Alert archive / Georgia / Areal Flood Warnings in 2008

Areal Flood Warning 18, NWS Atlanta, GA

December 13, 2008Whitfield County, Georgia

NWS Atlanta, GA issued this areal flood warning at Dec 13, 2008, 11:37 AM EST for Whitfield County, Georgia. It was in force for 4 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: Dec 13, 2008, 11:37 AM EST (16:37 UTC)
Expired: Dec 13, 2008, 3:30 PM EST
In force: 4 hr
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Flood severity: None

County Whitfield County, GA

The radar

The Northeast Alabama radar (KHTX), 103 km from the middle of the area, began a volume at 16:35 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

Nashville Metro, TN (KBNA), launched 12:00Z, 4.6 hours before the alert went out and 209 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: 1284 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 118 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 areal flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Atlanta, GA wrote its last area forecast discussion before this areal flood warning went out at Dec 12, 5:20 PM EST, 18 hours 17 minutes earlier.

Area forecast discussion, Dec 12, 5:20 PM EST, 18 hours 17 minutes before

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The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 12, 10:25 PM EST	Areal Flood Warning	FFC	Murray, Whitfield	12 hr
Dec 13, 9:02 AM EST	Areal Flood Warning	FFC	Washington, Wilkinson	57 hr

Nearby

Areal Flood Warnings in Georgia, 2008 Every areal flood warning in 2008

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.