Alert archive / Georgia / Dense Fog Advisories in 2018

Dense Fog Advisory 3, NWS Atlanta, GA

March 20, 201843 counties in Georgia

NWS Atlanta, GA issued this dense fog advisory at Mar 20, 2018, 5:55 AM EDT for 43 counties in Georgia. It took effect at Mar 20, 2018, 6:00 AM EDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued: Mar 20, 2018, 5:55 AM EDT (09:55 UTC)
In effect from: Mar 20, 2018, 6:00 AM EDT
Expired: Mar 20, 2018, 10:00 AM EDT
In force: 4 hr
Issued by: NWS Atlanta, GA

All 43 counties

Banks County, GA, Barrow County, GA, Bartow County, GA, Carroll County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Clarke County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Dade County, GA, Dawson County, GA, DeKalb County, GA, Douglas County, GA, Fannin County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Lumpkin County, GA, Madison County, GA, Murray County, GA, Newton County, GA, Oconee County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Rockdale County, GA, Towns County, GA, Union County, GA, Walker County, GA, Walton County, GA, White County, GA, Whitfield County, GA

The radar

The Atlanta radar (KFFC), 90 km from the middle of the area, began a volume at 09:56 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, 9.9 hours before the alert went out and 88 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: 184 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 630 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Mar 20, 4:43 AM EDT, 1 hour 12 minutes earlier.

Area forecast discussion, Mar 20, 4:43 AM EDT, 1 hour 12 minutes before

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Hazardous weather outlook, Mar 20, 4:32 AM EDT, 1 hour 23 minutes before

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In the hours before

Local storm report, Mar 20, 3:46 AM EDT, 2 hours 9 minutes before

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Local storm report, Mar 20, 3:50 AM EDT, 2 hours 5 minutes before

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Special weather statement, Mar 20, 3:57 AM EDT, 1 hour 58 minutes before

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Special weather statement, Mar 20, 3:59 AM EDT, 1 hour 56 minutes before

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Special weather statement, Mar 20, 4:27 AM EDT, 1 hour 28 minutes before

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Local storm report, Mar 20, 5:02 AM EDT, 53 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
Mar 19, 9:22 PM EDT	Severe Thunderstorm Warning	FFC	Dade, Walker	38 min
Mar 19, 9:36 PM EDT	Severe Thunderstorm Warning	FFC	Floyd, Haralson, Polk	39 min
Mar 19, 9:43 PM EDT	Tornado Warning	FFC	Floyd, Polk	47 min
Mar 19, 9:59 PM EDT	Tornado Warning Tornado observedConsiderable damage threat	FFC	Haralson	46 min
Mar 19, 10:14 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, Paulding, Polk	46 min
Mar 19, 10:32 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Douglas, Haralson, Paulding	43 min
Mar 19, 10:51 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, Douglas, Fulton	24 min
Mar 19, 10:53 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Clayton, Douglas, Fayette, Fulton	52 min
Mar 19, 10:59 PM EDT	Flash Flood Warning	FFC	Carroll, Haralson, Paulding	6 hr
Mar 19, 10:59 PM EDT	Tornado Warning	FFC	Douglas, Fulton	31 min
Mar 19, 11:15 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, DeKalb, Fulton, Henry	30 min
Mar 19, 11:15 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Coweta, Douglas, Fayette, Haralson, Heard	30 min
Mar 19, 11:31 PM EDT	Severe Thunderstorm Warning	FFC	Butts, Clayton, DeKalb, Fayette, Henry, Newton and 3 more	29 min
Mar 19, 11:44 PM EDT	Special Weather Statement	FFC	Gwinnett, Walton	31 min
Mar 19, 11:47 PM EDT	Special Weather Statement	FFC	Coweta	28 min
Mar 19, 11:49 PM EDT	Special Weather Statement	FFC	Carroll	26 min
Mar 19, 11:58 PM EDT	Severe Thunderstorm Warning	FFC	Butts, Fayette, Henry, Jasper, Morgan, Newton and 2 more	47 min
Mar 20, 12:00 AM EDT	Special Weather Statement	FFC	Morgan, Rockdale	30 min
Mar 20, 12:15 AM EDT	Special Weather Statement	FFC	Barrow, Clarke, Oconee, Walton	30 min
Mar 20, 12:20 AM EDT	Special Weather Statement	FFC	Coweta	40 min
Mar 20, 12:27 AM EDT	Severe Thunderstorm Warning	FFC	Greene, Jasper, Morgan, Putnam	48 min
Mar 20, 12:45 AM EDT	Severe Thunderstorm Warning	FFC	Butts, Jasper, Jones, Monroe	30 min
Mar 20, 1:02 AM EDT	Special Weather Statement	FFC	Butts, Coweta, Heard, Jasper, Lamar, Meriwether and 5 more	43 min
Mar 20, 1:13 AM EDT	Severe Thunderstorm Warning	FFC	Baldwin, Hancock, Jones, Putnam, Warren, Washington	47 min
Mar 20, 1:14 AM EDT	Severe Thunderstorm Warning	FFC	Hancock, Taliaferro, Warren	46 min
Mar 20, 1:24 AM EDT	Severe Thunderstorm Warning	FFC	Butts, Jasper, Jones, Lamar, Monroe, Pike and 1 more	51 min
Mar 20, 1:53 AM EDT	Severe Thunderstorm Warning	FFC	Baldwin, Glascock, Hancock, Jefferson, Johnson, Washington	52 min
Mar 20, 1:58 AM EDT	Special Weather Statement	FFC	Meriwether, Pike, Troup	32 min
Mar 20, 2:35 AM EDT	Special Weather Statement	FFC	Harris, Jones, Lamar, Meriwether, Monroe, Pike and 2 more	25 min
Mar 20, 2:46 AM EDT	Severe Thunderstorm Warning	FFC	Emanuel, Jefferson, Washington	44 min
Mar 20, 3:13 AM EDT	Special Weather Statement	FFC	Bibb, Upson	32 min
Mar 20, 3:27 AM EDT	Special Weather Statement	FFC	Jefferson	33 min
Mar 20, 3:57 AM EDT	Special Weather Statement	FFC	Twiggs, Wilkinson	33 min
Mar 20, 3:59 AM EDT	Special Weather Statement	FFC	Johnson	31 min
Mar 20, 4:27 AM EDT	Special Weather Statement	FFC	Emanuel	33 min
Mar 20, 3:32 PM EDT	Wind Advisory	FFC	Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 90 more	28 hr

Nearby

Dense Fog Advisories in Georgia, 2018 Every dense fog advisory in 2018

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.