Alert archive / Georgia / Dense Fog Advisories in 2017

Dense Fog Advisory 21, NWS Atlanta, GA

December 30, 20178 counties in Georgia

NWS Atlanta, GA issued this dense fog advisory at Dec 30, 2017, 6:27 AM EST for 8 counties in Georgia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Dec 30, 2017, 6:27 AM EST (11:27 UTC)
Expired
Dec 30, 2017, 9:00 AM EST
In force
3 hr
Issued by
NWS Atlanta, GA

Counties Crisp County, GA, Dodge County, GA, Dooly County, GA, Pulaski County, GA, Sumter County, GA, Telfair County, GA, Wheeler County, GA, Wilcox County, GA

The radar

The Robins AFB radar (KJGX), 68 km from the middle of the area, began a volume at 11:28 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, 11.5 hours before the alert went out and 176 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 00:00Z on 2017-12-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 00:00Z on 2017-12-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1717 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

184 
WWUS72 KFFC 301127
NPWFFC

URGENT - WEATHER MESSAGE
National Weather Service Peachtree City GA
627 AM EST Sat Dec 30 2017


GAZ104>111-301400-
/O.NEW.KFFC.FG.Y.0021.171230T1127Z-171230T1400Z/
Sumter-Dooly-Crisp-Pulaski-Wilcox-Dodge-Telfair-Wheeler-
Including the cities of Americus and Cordele
627 AM EST Sat Dec 30 2017

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EST THIS MORNING...

The National Weather Service in Peachtree City has issued a Dense
Fog Advisory, which is in effect until 9 AM EST this morning.

* Locations...Southern portion of central Georgia, mainly along
  and south of a line from Americus to Hawkinsville to Alamo.

* Visibilities...A quarter mile or less.

* Timing...Now through 9 AM EST.

* Impacts...Reduced visibility will result in difficult driving 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Dense Fog Advisory means visibilities will frequently be
reduced to less than one quarter mile. If driving...slow down...
use your headlights...and leave plenty of distance ahead of you.

&&

$$

Nearby

Dense Fog Advisories in Georgia, 2017Every dense fog advisory in 2017

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.