Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 29, NWS Atlanta, GA

April 4, 2018Chattooga County, Dade County, Walker County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 4, 2018, 12:31 AM EDT for Chattooga County, Dade County, Walker County, Georgia. It was in force for 44 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 4, 2018, 12:31 AM EDT (04:31 UTC)
Expired: Apr 4, 2018, 1:15 AM EDT
In force: 44 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Chattooga County, GA, Dade County, GA, Walker County, GA

The radar

The Northeast Alabama radar (KHTX), 73 km from the middle of the area, began a volume at 04:33 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.

What was reported inside it

Time	Report	Where	Remark
Apr 4, 1:05 AM EDT	TSTM WND DMG	3 Se Cole City, GA	MULTIPLE TREES DOWN IN THE NEW HOME AREA.
Apr 4, 1:12 AM EDT	TSTM WND DMG	1 Nne Chattanooga Vall, GA	6 TREES WERE REPORTED DOWN AND 2 TREES UPROOTED NEAR THE INTERSECTION OF CHATTANOOGA VALLEY ROAD AND EAST AVE. 57 MPH GUST WAS RECORDED ON A PERSONAL WEATHER STATION.
Apr 4, 1:13 AM EDT	TSTM WND DMG	Lafayette, GA	A TREE DOWN AND MULTIPLE POWER LINES DOWN IN LAFAYETTE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 3, 10:47 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.5 hours before the alert went out and 173 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: 66 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1853 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

834 
WUUS52 KFFC 040431
SVRFFC
GAC055-083-295-040515-
/O.NEW.KFFC.SV.W.0029.180404T0431Z-180404T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
1231 AM EDT WED APR 4 2018

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Walker County in northwestern Georgia...
  Western Chattooga County in northwestern Georgia...
  Dade County in northwestern Georgia...

* Until 115 AM EDT

* At 1230 AM EDT, severe thunderstorms were located along a line
  extending from near Jericho to near Dutton to near Boaz, moving
  east at 60 mph.

  HAZARD...60 mph wind gusts and nickel size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Chattanooga, Lafayette, Summerville, Trenton, Fort Oglethorpe,
  Rossville, Chickamauga, Trion, Lookout Mountain, Lyerly, Menlo,
  Center Post, Fairview, Linwood, Cloudland, Chattanooga  Valley,
  Cloudland Canyon State Park, Hooker, Cooper Heights and Rock
  Spring.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across northern Alabama. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows! If you see 
wind damage...hail or flooding...wait until the storm has 
passed...and then call the National Weather Service toll free at 1 8 
6 6 7 6 3 4 4 6 6 or tweet us your report at NWSATLANTA.

&&

LAT...LON 3499 8528 3496 8526 3486 8526 3485 8521
      3478 8520 3477 8517 3476 8516 3432 8545
      3432 8547 3498 8560
TIME...MOT...LOC 0430Z 259DEG 53KT 3503 8608 3466 8591 3418 8621 

HAIL...0.88IN
WIND...60MPH
 
$$

The office that day

Everything else NWS Atlanta, GA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 4, 1:11 AM EDT	Severe Thunderstorm Warning	FFC	Catoosa, Chattooga, Fannin, Floyd, Gordon, Murray and 2 more	49 min
Apr 4, 1:21 AM EDT	Special Weather Statement	FFC	Bartow, Floyd, Haralson, Paulding, Polk	39 min
Apr 4, 1:56 AM EDT	Special Weather Statement	FFC	Bartow, Carroll, Cherokee, Cobb, Dawson, Douglas and 7 more	49 min
Apr 4, 2:39 AM EDT	Special Weather Statement	FFC	Clayton, Coweta, Dawson, DeKalb, Forsyth, Fulton and 7 more	36 min
Apr 4, 3:05 AM EDT	Special Weather Statement	FFC	Towns, White	10 min
Apr 4, 3:10 AM EDT	Special Weather Statement	FFC	Banks, Barrow, Clayton, Coweta, DeKalb, Fayette and 6 more	35 min
Apr 4, 3:40 AM EDT	Freeze Warning	FFC	Bartow, Catoosa, Chattooga, Cherokee, Dade, Dawson and 15 more	29 hr

Nearby

Severe Thunderstorm Warnings in Georgia, 2018 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.