Alert archive / Georgia / Winter Weather Advisories in 2017

Winter Weather Advisory 1, NWS Atlanta, GA

January 7, 201727 counties in Georgia

NWS Atlanta, GA issued this winter weather advisory at Jan 7, 2017, 3:33 AM EST for 27 counties in Georgia. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jan 7, 2017, 3:33 AM EST (08:33 UTC)
Expired: Jan 7, 2017, 10:40 AM EST
In force: 7 hr
Issued by: NWS Atlanta, GA

All 27 counties

Butts County, GA, Clarke County, GA, Clayton County, GA, Coweta County, GA, Fayette County, GA, Greene County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Jasper County, GA, Lamar County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Pike County, GA, Putnam County, GA, Rockdale County, GA, Spalding County, GA, Talbot County, GA, Taliaferro County, GA, Troup County, GA, Upson County, GA, Walton County, GA, Wilkes County, GA

The radar

The Atlanta radar (KFFC), 53 km from the middle of the area, began a volume at 08:34 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 00:00Z, 8.6 hours before the alert went out and 332 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: 26 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather 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 winter weather advisory went out at Jan 6, 3:17 PM EST, 12 hours 16 minutes earlier.

Area forecast discussion, Jan 6, 3:17 PM EST, 12 hours 16 minutes before

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Hazardous weather outlook, Jan 6, 3:28 PM EST, 12 hours 5 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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 7, 3:33 AM EST	Wind Chill Advisory	FFC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 20 more	8 hr
Jan 7, 10:48 AM EST	River Flood Warning	FFC	Dodge, Telfair, Wilcox	5 days
Jan 7, 11:30 AM EST	River Flood Warning	FFC	Bleckley, Pulaski	4 days
Jan 7, 2:31 PM EST	Wind Chill Advisory	FFC	Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 30 more	21 hr

Nearby

Winter Weather Advisories in Georgia, 2017 Every winter weather 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.