Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 164, NWS Atlanta, GA

April 15, 2011Cherokee County, Cobb County, Fulton County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 15, 2011, 7:43 PM EDT for Cherokee County, Cobb County, Fulton County, Georgia. It was in force for 47 min. 6 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 15, 2011, 7:43 PM EDT (23:43 UTC)
Expired: Apr 15, 2011, 8:30 PM EDT
In force: 47 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon

Counties Cherokee County, GA, Cobb County, GA, Fulton County, GA

The radar

The Atlanta radar (KFFC), 78 km from the middle of the area, began a volume at 23:44 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 15, 7:44 PM EDT	TSTM WND DMG	Marietta, GA	COBB COUNTY 911 RELAYED A REPORT OF COUNTY WIDE TREE DAMAGE AND POWER LINES DOWN.
Apr 15, 7:51 PM EDT	HAIL 1	2 S Smyrna, GA
Apr 15, 8:00 PM EDT	TSTM WND DMG	3 Se Marietta, GA	TREES DOWN ON CARS AT I-75 AND I-285.
Apr 15, 8:05 PM EDT	HAIL 0.5	Marietta, GA
Apr 15, 8:08 PM EDT	TSTM WND DMG	Sandy Springs, GA	FULTON COUNTY EMA RELAYED A REPORT OF TREE DOWN ACROSS THE NORTHERN AND CENTRAL PARTS OF THE COUNTY. ALSO REPORTS THAT A HOUSE HAS COLLAPSED IN THE SANDY SPRINGS AREA.
Apr 15, 8:15 PM EDT	HAIL 1	Marietta, GA	NEAR LAKE SHORE WAY...LASTING ABOUT 10 MINUTES.

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 15, 5:46 PM EDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.7 hours before the alert went out and 77 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1094 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

671 
WUUS52 KFFC 152343
SVRFFC
GAC057-067-121-160030-
/O.NEW.KFFC.SV.W.0164.110415T2343Z-110416T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
743 PM EDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN PEACHTREE CITY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CHEROKEE COUNTY IN NORTH CENTRAL GEORGIA
  COBB COUNTY IN NORTH CENTRAL GEORGIA
  NORTHEASTERN FULTON COUNTY IN NORTH CENTRAL GEORGIA

* UNTIL 830 PM EDT

* AT 740 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZED HAIL...AND
  DAMAGING WINDS UP TO 60 MPH.  THIS STORM WAS LOCATED NEAR
  MARIETTA...MOVING NORTHEAST AT 40 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  KENNESAW...SANDY SPRINGS...WOODSTOCK...MOUNTAIN PARK...ROSWELL...
  ALPHARETTA...MILTON AND FREE HOME.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

IF YOU SEE WIND DAMAGE...LARGE HAIL OR SIGNIFICANT 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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT SATURDAY MORNING
FOR NORTHERN GEORGIA.

&&

LAT...LON 3429 8431 3422 8425 3411 8426 3410 8422
      3406 8416 3396 8432 3397 8434 3395 8434
      3379 8461 3392 8473 3395 8472
TIME...MOT...LOC 2344Z 236DEG 33KT 3393 8456

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 4:12 AM EDT	Wind Advisory	FFC	Bartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 18 more	16 hr
Apr 15, 4:54 PM EDT	Severe Thunderstorm Warning	FFC	Bartow, Cherokee, Gordon, Murray, Pickens	51 min
Apr 15, 5:14 PM EDT	Tornado Warning	FFC	Gilmer, Gordon, Pickens	46 min
Apr 15, 5:52 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Fannin, Gilmer, Pickens	23 min
Apr 15, 6:14 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Fannin, Lumpkin, Union	46 min
Apr 15, 6:20 PM EDT	Severe Thunderstorm Warning	FFC	Gordon, Murray, Whitfield	25 min
Apr 15, 6:29 PM EDT	Severe Thunderstorm Warning	FFC	Carroll	46 min
Apr 15, 6:35 PM EDT	Severe Thunderstorm Warning	FFC	Towns	40 min
Apr 15, 6:38 PM EDT	Severe Thunderstorm Warning	FFC	Bartow, Floyd, Gordon	52 min
Apr 15, 6:41 PM EDT	Severe Thunderstorm Warning	FFC	Fannin, Gilmer, Murray	49 min
Apr 15, 6:44 PM EDT	Severe Thunderstorm Warning	FFC	Bartow, Cherokee, Cobb, Fulton, Paulding, Polk	46 min
Apr 15, 6:52 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Douglas, Paulding	23 min
Apr 15, 7:07 PM EDT	Severe Thunderstorm Warning	FFC	Harris, Troup	38 min
Apr 15, 7:11 PM EDT	Severe Thunderstorm Warning	FFC	Cobb, Douglas, Fulton	34 min
Apr 15, 7:22 PM EDT	Tornado Warning	FFC	Harris, Muscogee	38 min
Apr 15, 7:51 PM EDT	Tornado Warning	FFC	Harris, Meriwether, Talbot	39 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011 Every severe thunderstorm warning in 2011

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.