Alert archive / Georgia / Dense Fog Advisories in 2013

Dense Fog Advisory 2, NWS Atlanta, GA

January 29, 201335 counties in Georgia

NWS Atlanta, GA issued this dense fog advisory at Jan 29, 2013, 4:36 AM EST for 35 counties in Georgia. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Jan 29, 2013, 4:36 AM EST (09:36 UTC)
Expired: Jan 29, 2013, 10:00 AM EST
In force: 5 hr
Issued by: NWS Atlanta, GA

All 35 counties

Baldwin County, GA, Bibb County, GA, Bleckley County, GA, Chattahoochee County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Emanuel County, GA, Glascock County, GA, Hancock County, GA, Houston County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Laurens County, GA, Macon County, GA, Marion County, GA, Montgomery County, GA, Peach County, GA, Pulaski County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Taylor County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Twiggs County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 20 km from the middle of the area, began a volume at 09:40 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, 9.6 hours before the alert went out and 140 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: 900 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 136 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 dense fog advisory 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 dense fog advisory went out at Jan 29, 4:35 AM EST, 1 minute earlier.

Area forecast discussion, Jan 29, 4:35 AM EST, 1 minute 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
Jan 29, 3:59 AM EST	High Wind Watch	FFC	Dawson, Fannin, Gilmer, Lumpkin, Towns, Union and 1 more	12 hr
Jan 29, 4:19 AM EST	Flood Watch	FFC	Bartow, Catoosa, Chattooga, Cherokee, Cobb, Dade and 18 more	43 hr
Jan 29, 3:43 PM EST	High Wind Warning	FFC	Dawson, Fannin, Gilmer, Lumpkin, Murray, Pickens and 3 more	23 hr
Jan 29, 3:43 PM EST	Wind Advisory	FFC	Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 90 more	48 hr

Nearby

Dense Fog Advisories in Georgia, 2013 Every dense fog advisory in 2013

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.