Alert archive / Georgia / Dense Fog Advisories in 2017

Dense Fog Advisory 2, NWS Atlanta, GA

January 19, 201733 counties in Georgia

NWS Atlanta, GA issued this dense fog advisory at Jan 19, 2017, 8:04 AM EST for 33 counties in Georgia. It took effect at Jan 19, 2017, 9:00 AM EST. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued: Jan 19, 2017, 8:04 AM EST (13:04 UTC)
In effect from: Jan 19, 2017, 9:00 AM EST
Expired: Jan 19, 2017, 11:00 AM EST
In force: 2 hr
Issued by: NWS Atlanta, GA

All 33 counties

Bibb County, GA, Bleckley County, GA, Chattahoochee County, GA, Crawford County, GA, Crisp County, GA, Dodge County, GA, Dooly County, GA, Emanuel County, GA, Harris County, GA, Houston County, GA, Johnson County, GA, Laurens County, GA, Macon County, GA, Marion County, GA, Monroe County, GA, Montgomery County, GA, Muscogee County, GA, Peach County, GA, Pulaski County, GA, Schley County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Twiggs County, GA, Upson County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Wilkinson County, GA

The radar

The Robins AFB radar (KJGX), 44 km from the middle of the area, began a volume at 13:05 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 1.1 hours before the alert went out and 230 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: 922 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 1 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 19, 6:50 AM EST, 1 hour 14 minutes earlier.

Area forecast discussion, Jan 19, 6:50 AM EST, 1 hour 14 minutes before

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Hazardous weather outlook, Jan 19, 4:33 AM EST, 3 hours 31 minutes before

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Nearby

Dense Fog Advisories in Georgia, 2017 Every 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.