Alert archive / Georgia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 283, NWS Atlanta, GA

July 11, 2017Gwinnett County, Rockdale County, Walton County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jul 11, 2017, 5:16 PM EDT for Gwinnett County, Rockdale County, Walton County, Georgia. It was in force for 17 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: Jul 11, 2017, 5:16 PM EDT (21:16 UTC)
Expired: Jul 11, 2017, 5:33 PM EDT
In force: 17 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Gwinnett County, GA, Rockdale County, GA, Walton County, GA

The radar

The Atlanta radar (KFFC), 72 km from the middle of the area, began a volume at 21:19 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, 5:27 PM EDT	TSTM WND DMG	Centerville, GA	A TREE WAS REPORTED DOWN ON ZOAR CHURCH ROAD AT CENTERVILLE HIGHWAY.

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, 9.3 hours before the alert went out and 67 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: 988 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 710 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: -20 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

925 
WUUS52 KFFC 112116
SVRFFC
GAC135-247-297-112145-
/O.NEW.KFFC.SV.W.0283.170711T2116Z-170711T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
516 PM EDT TUE JUL 11 2017

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Northeastern Rockdale County in north central Georgia...
  Southeastern Gwinnett County in north central Georgia...
  Northwestern Walton County in north central Georgia...

* Until 545 PM EDT

* At 516 PM EDT, a severe thunderstorm was located over Snellville,
  or 9 miles south of Lawrenceville, moving east at 15 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Lawrenceville, Conyers, Snellville, Loganville, Grayson, Walnut
  Grove, Between, Georgia International Horse Park, Lakeview Estates,
  Mountain Park, Windsor, Nicholasville, Youth, Big Haynes Creek Park
  and Rosebud.

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 3387 8374 3369 8383 3374 8391 3372 8392
      3371 8391 3371 8393 3369 8392 3366 8393
      3372 8406 3375 8403 3377 8406 3378 8408
      3382 8413 3394 8407
TIME...MOT...LOC 2116Z 291DEG 13KT 3383 8403 

HAIL...1.00IN
WIND...60MPH
 
$$

1 follow-up statement

579 
WWUS52 KFFC 112133
SVSFFC

Severe Weather Statement
National Weather Service Peachtree City GA
533 PM EDT TUE JUL 11 2017

GAC135-247-297-112143-
/O.CAN.KFFC.SV.W.0283.000000T0000Z-170711T2145Z/
Rockdale GA-Gwinnett GA-Walton GA-
533 PM EDT TUE JUL 11 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN ROCKDALE...
SOUTHEASTERN GWINNETT AND NORTHWESTERN WALTON COUNTIES IS
CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning has been cancelled.

LAT...LON 3387 8374 3369 8383 3374 8391 3372 8392
      3371 8391 3371 8393 3369 8392 3366 8393
      3372 8406 3375 8403 3377 8406 3378 8408
      3382 8413 3394 8407
TIME...MOT...LOC 2129Z 291DEG 13KT 3381 8396 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 9:02 PM EDT	Special Weather Statement	FFC	Barrow	28 min
Jul 11, 9:04 AM EDT	Special Weather Statement	FFC	Schley	41 min
Jul 11, 2:03 PM EDT	Special Weather Statement	FFC	Wheeler	27 min
Jul 11, 2:25 PM EDT	Special Weather Statement	FFC	Telfair	50 min
Jul 11, 2:27 PM EDT	Special Weather Statement	FFC	Hall	48 min
Jul 11, 2:36 PM EDT	Special Weather Statement	FFC	Cobb	39 min
Jul 11, 2:47 PM EDT	Special Weather Statement	FFC	DeKalb	28 min
Jul 11, 2:50 PM EDT	Special Weather Statement	FFC	Taylor	40 min
Jul 11, 3:03 PM EDT	Special Weather Statement	FFC	Carroll	42 min
Jul 11, 3:11 PM EDT	Special Weather Statement	FFC	Cherokee	49 min
Jul 11, 3:14 PM EDT	Special Weather Statement	FFC	Montgomery	46 min
Jul 11, 3:19 PM EDT	Special Weather Statement	FFC	Wilkinson	26 min
Jul 11, 3:28 PM EDT	Special Weather Statement	FFC	Taylor	47 min
Jul 11, 3:46 PM EDT	Special Weather Statement	FFC	Jefferson	29 min
Jul 11, 3:51 PM EDT	Special Weather Statement	FFC	Forsyth	24 min
Jul 11, 4:12 PM EDT	Severe Thunderstorm Warning	FFC	Forsyth, Gwinnett	33 min
Jul 11, 4:19 PM EDT	Special Weather Statement	FFC	Webster	26 min
Jul 11, 4:31 PM EDT	Special Weather Statement	FFC	Clayton	44 min
Jul 11, 4:46 PM EDT	Special Weather Statement	FFC	Gwinnett	29 min
Jul 11, 4:50 PM EDT	Special Weather Statement	FFC	Marion	40 min
Jul 11, 4:58 PM EDT	Special Weather Statement	FFC	Clayton, Fayette, Rockdale	47 min
Jul 11, 5:02 PM EDT	Severe Thunderstorm Warning	FFC	Coweta, Fulton	28 min
Jul 11, 5:34 PM EDT	Severe Thunderstorm Warning	FFC	Douglas	15 min
Jul 11, 5:43 PM EDT	Severe Thunderstorm Warning	FFC	Rockdale	11 min
Jul 11, 5:56 PM EDT	Special Weather Statement	FFC	Johnson	34 min
Jul 11, 6:12 PM EDT	Special Weather Statement	FFC	Telfair	48 min
Jul 11, 6:14 PM EDT	Special Weather Statement	FFC	Johnson	31 min
Jul 11, 6:20 PM EDT	Special Weather Statement	FFC	Troup	40 min
Jul 11, 6:23 PM EDT	Special Weather Statement	FFC	Butts, Henry, Meriwether, Newton, Pike, Spalding	52 min
Jul 11, 6:30 PM EDT	Special Weather Statement	FFC	Johnson	45 min
Jul 11, 6:39 PM EDT	Severe Thunderstorm Warning	FFC	Troup	25 min
Jul 11, 6:52 PM EDT	Special Weather Statement	FFC	Jefferson	38 min
Jul 11, 7:08 PM EDT	Special Weather Statement	FFC	Troup	37 min
Jul 11, 7:09 PM EDT	Special Weather Statement	FFC	Dooly	36 min
Jul 11, 7:12 PM EDT	Special Weather Statement	FFC	Butts, Jasper, Pike, Spalding	33 min
Jul 11, 7:24 PM EDT	Special Weather Statement	FFC	Muscogee	36 min
Jul 11, 7:36 PM EDT	Severe Thunderstorm Warning	FFC	Harris, Muscogee	13 min
Jul 11, 7:44 PM EDT	Special Weather Statement	FFC	Butts, Lamar, Pike	46 min
Jul 11, 7:48 PM EDT	Special Weather Statement	FFC	Troup	87 min
Jul 11, 7:52 PM EDT	Special Weather Statement	FFC	Meriwether	23 min
Jul 11, 7:54 PM EDT	Special Weather Statement	FFC	Harris	36 min
Jul 11, 7:58 PM EDT	Severe Thunderstorm Warning	FFC	Harris, Talbot	28 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2017 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.