Alert archive / Georgia / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 203, NWS Atlanta, GA

July 11, 20165 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 11, 2016, 6:31 PM EDT for 5 counties in Georgia. It was in force for 29 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: Jul 11, 2016, 6:31 PM EDT (22:31 UTC)
Expired: Jul 11, 2016, 7:00 PM EDT
In force: 29 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties DeKalb County, GA, Gwinnett County, GA, Newton County, GA, Rockdale County, GA, Walton County, GA

The radar

The Atlanta radar (KFFC), 54 km from the middle of the area, began a volume at 22:30 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
Jul 11, 7:00 PM EDT	TSTM WND DMG	Covington, GA	911 CALL CENTER RECEIVED REPORT OF ONE TREE DOWN AT HWY 278 AND 142E NEAR COVINGTON AND ANOTHER TREE DOWN AT OAK HILL RD AND HWY 212 NEAR WEST FOREST
Jul 11, 7:00 PM EDT	TSTM WND DMG	Snapfinger, GA	911 CALL CENTER RECEIVED REPORT OF ONE TREE DOWN ON EVANS MILL RD NEAR SNAPFINGER...ONE TREE DOWN ON ROCK SPRINGS RD NEAR SNAPFINGER...ONE TREE DOWN ON ROWLAND RD NEAR STONE MOUNTAIN...AND ONE TREE DOWN ON AUSTIN DR NEAR DECATUR
Jul 11, 7:00 PM EDT	TSTM WND DMG	Social Circle, GA	MULTIPLE TREES DOWN ACROSS WALTON COUNTY...ONE TREE IN SOCIAL CIRCLE AT ALCOVA DR AND LAUREL LN...TREES DOWN ON HICKORY GROVE CHURCH RD NEAR NICHOLASVILLE...TREES DOWN ON SANDY CREEK RD NEAR ZINGARA...AND TREES AND POWERLINES DOWN ON STOCK RD NEAR NICHOLASVILL

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

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 10.5 hours before the alert went out and 48 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: 133 J/kg
Mixed-layer CIN: -205 J/kg
Mixed-layer LCL: 1028 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

787 
WUUS52 KFFC 112231
SVRFFC
GAC089-135-217-247-297-112300-
/O.NEW.KFFC.SV.W.0203.160711T2231Z-160711T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
631 PM EDT MON JUL 11 2016

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL WALTON COUNTY IN GEORGIA...
  SOUTH CENTRAL GWINNETT COUNTY IN GEORGIA...
  ROCKDALE COUNTY IN GEORGIA...
  DEKALB COUNTY IN GEORGIA...
  NEWTON COUNTY IN GEORGIA...

* UNTIL 700 PM EDT

* AT 631 PM EDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM LAKE CITY TO NEAR MCDONOUGH TO NEAR LOCUST GROVE...
  MOVING NORTHEAST AT 45 MPH.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ATLANTA...DECATUR...CONYERS...MONROE...COVINGTON...SNELLVILLE...
  LOGANVILLE...CLARKSTON...STONE MOUNTAIN...SOCIAL CIRCLE...AVONDALE
  ESTATES...OXFORD...LITHONIA...PORTERDALE...WALNUT GROVE...PINE LAKE...
  BETWEEN...JERSEY...CANDLER-MCAFEE AND BELVEDERE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

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 3370 8435 3384 8426 3382 8377 3369 8361
      3360 8368 3357 8368 3343 8391 3348 8395
      3350 8403 3352 8404 3352 8406 3353 8404
      3354 8405 3358 8414 3364 8419 3365 8422
      3363 8423 3363 8424 3365 8425 3365 8435
TIME...MOT...LOC 2231Z 219DEG 40KT 3361 8431 3352 8415 3341 8407 

HAIL...<.75IN
WIND...60MPH
 
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 3:24 PM EDT	Special Weather Statement	FFC	Webster	36 min
Jul 11, 3:39 PM EDT	Severe Thunderstorm Warning	FFC	Marion, Schley, Stewart, Sumter, Webster	51 min
Jul 11, 4:41 PM EDT	Special Weather Statement	FFC	Harris	34 min
Jul 11, 5:08 PM EDT	Severe Thunderstorm Warning	FFC	Harris, Meriwether, Talbot, Troup	52 min
Jul 11, 5:10 PM EDT	Special Weather Statement	FFC	Troup	35 min
Jul 11, 5:31 PM EDT	Severe Thunderstorm Warning	FFC	Coweta, Fayette, Meriwether, Troup	44 min
Jul 11, 6:02 PM EDT	Special Weather Statement	FFC	Fulton	28 min
Jul 11, 6:06 PM EDT	Special Weather Statement	FFC	Cobb	39 min
Jul 11, 6:12 PM EDT	Severe Thunderstorm Warning	FFC	Bartow, Cherokee, Cobb, Forsyth, Fulton, Paulding	48 min
Jul 11, 6:13 PM EDT	Severe Thunderstorm Warning	FFC	Clayton, Fayette	32 min
Jul 11, 6:16 PM EDT	Severe Thunderstorm Warning	FFC	Henry	29 min
Jul 11, 7:01 PM EDT	Special Weather Statement	FFC	Bartow, Cherokee, Dawson, Floyd, Forsyth, Gordon and 3 more	44 min
Jul 11, 7:01 PM EDT	Severe Thunderstorm Warning	FFC	Barrow, DeKalb, Gwinnett, Newton, Rockdale, Walton	29 min
Jul 11, 7:09 PM EDT	Severe Thunderstorm Warning	FFC	Cherokee, Pickens	36 min
Jul 11, 7:33 PM EDT	Special Weather Statement	FFC	Barrow, Gwinnett, Jackson, Oconee, Walton	27 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2016 Every severe thunderstorm warning in 2016

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.