Alert archive / Georgia / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 166, NWS Atlanta, GA

August 17, 2014Catoosa County, Dade County, Walker County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Aug 17, 2014, 3:53 PM EDT for Catoosa County, Dade County, Walker County, Georgia. It was in force for 52 min. 1 report 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: Aug 17, 2014, 3:53 PM EDT (19:53 UTC)
Expired: Aug 17, 2014, 4:45 PM EDT
In force: 52 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Catoosa County, GA, Dade County, GA, Walker County, GA

The radar

The Northeast Alabama radar (KHTX), 64 km from the middle of the area, began a volume at 19:54 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
Aug 17, 4:10 PM EDT	TSTM WND DMG	Trenton, GA	4 LARGE TREES DOWN ACROSS COUNTY.

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

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 7.9 hours before the alert went out and 178 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: 461 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 1090 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

921 
WUUS52 KFFC 171953
SVRFFC
GAC047-083-295-172045-
/O.NEW.KFFC.SV.W.0166.140817T1953Z-140817T2045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
353 PM EDT SUN AUG 17 2014

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN CATOOSA COUNTY IN NORTHWEST GEORGIA
  DADE COUNTY IN NORTHWEST GEORGIA
  WALKER COUNTY IN NORTHWEST GEORGIA

* UNTIL 445 PM EDT

* AT 349 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZED
  HAIL...AND DAMAGING WINDS UP TO 60 MPH.  THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM 14 MILES NORTHWEST OF TRENTON TO 13
  MILES WEST OF TRENTON TO 22 MILES SOUTHWEST OF TRENTON...MOVING
  EAST AT 30 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LOOKOUT MOUNTAIN...CHICKAMAUGA...FORT OGLETHORPE AND LAFAYETTE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 8512 3481 8515 3462 8531 3465 8555
      3495 8561 3498 8561 3499 8560
TIME...MOT...LOC 1953Z 274DEG 26KT 3499 8568 3486 8571
          3472 8582

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 2:45 PM EDT	Special Weather Statement	FFC	Carroll	30 min
Aug 17, 3:13 PM EDT	Special Weather Statement	FFC	Coweta	32 min
Aug 17, 3:45 PM EDT	Special Weather Statement	FFC	Clayton, Fayette	30 min
Aug 17, 4:10 PM EDT	Special Weather Statement	FFC	Chattahoochee, Harris, Marion, Muscogee, Schley	50 min
Aug 17, 4:33 PM EDT	Special Weather Statement	FFC	Gwinnett	27 min
Aug 17, 4:42 PM EDT	Special Weather Statement	FFC	Talbot, Upson	48 min
Aug 17, 4:45 PM EDT	Special Weather Statement	FFC	Catoosa, Whitfield	30 min
Aug 17, 4:58 PM EDT	Special Weather Statement	FFC	Carroll	32 min
Aug 17, 5:06 PM EDT	Special Weather Statement	FFC	Barrow, Gwinnett	24 min
Aug 17, 5:06 PM EDT	Severe Thunderstorm Warning	FFC	Butts, Henry, Jasper, Newton	39 min
Aug 17, 5:09 PM EDT	Special Weather Statement	FFC	Cobb, Paulding	36 min
Aug 17, 5:43 PM EDT	Special Weather Statement	FFC	Morgan	32 min
Aug 17, 5:46 PM EDT	Special Weather Statement	FFC	Fannin	29 min
Aug 17, 6:17 PM EDT	Special Weather Statement	FFC	Coweta, Fayette	28 min
Aug 17, 6:24 PM EDT	Special Weather Statement	FFC	Butts, Jasper, Jones	36 min
Aug 17, 6:38 PM EDT	Special Weather Statement	FFC	Coweta, Heard	52 min
Aug 17, 6:39 PM EDT	Special Weather Statement	FFC	Lumpkin	36 min
Aug 17, 6:41 PM EDT	Severe Thunderstorm Warning	FFC	Coweta, Fayette	33 min
Aug 17, 7:10 PM EDT	Special Weather Statement	FFC	Wilkes	35 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2014 Every severe thunderstorm warning in 2014

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.