Alert archive / Georgia / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Atlanta, GA

March 18, 20217 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Mar 18, 2021, 12:12 AM EDT for 7 counties in Georgia. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 18, 2021, 12:12 AM EDT (04:12 UTC)
Expired: Mar 18, 2021, 1:00 AM EDT
In force: 48 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Bartow County, GA, Chattooga County, GA, Floyd County, GA, Gordon County, GA, Haralson County, GA, Paulding County, GA, Polk County, GA

The radar

The Atlanta radar (KFFC), 85 km from the middle of the area, began a volume at 04:12 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Mar 18, 12:02 AM EDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 4.2 hours before the alert went out and 88 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: 11 J/kg
Mixed-layer CIN: -161 J/kg
Mixed-layer LCL: 466 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 404 m²/s²
0-3 km storm-relative helicity: 444 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

993 
WUUS52 KFFC 180412
SVRFFC
GAC015-055-115-129-143-223-233-180500-
/O.NEW.KFFC.SV.W.0009.210318T0412Z-210318T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
1212 AM EDT Thu Mar 18 2021

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Paulding County in northwestern Georgia...
  Haralson County in northwestern Georgia...
  Floyd County in northwestern Georgia...
  Western Gordon County in northwestern Georgia...
  Polk County in northwestern Georgia...
  Central Chattooga County in northwestern Georgia...
  Bartow County in northwestern Georgia...

* Until 100 AM EDT.

* At 1212 AM EDT, severe thunderstorms were located along a line
  extending from Fullerton to near Abernathy, moving east at 55 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Rome, Cartersville, Calhoun, Dallas, Cedartown, Summerville,
  Buchanan, Bremen, Adairsville, Rockmart, Euharlee, Hiram,
  Tallapoosa, Emerson, Aragon, Cave Spring, Kingston, Resaca, Waco
  and Braswell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 700 AM EDT for north central
and northwestern Georgia.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

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 3446 8550 3461 8490 3408 8469 3407 8474
      3380 8472 3377 8486 3381 8505 3372 8505
      3365 8530 3365 8533
TIME...MOT...LOC 0412Z 252DEG 47KT 3431 8550 3368 8545 

TORNADO...POSSIBLE
HAIL...0.75IN
WIND...60MPH
 
$$

1 follow-up statement

588 
WWUS52 KFFC 180459
SVSFFC

Severe Weather Statement
National Weather Service Peachtree City GA
1259 AM EDT Thu Mar 18 2021

GAC015-055-115-129-143-223-233-180509-
/O.EXP.KFFC.SV.W.0009.000000T0000Z-210318T0500Z/
Paulding GA-Haralson GA-Floyd GA-Gordon GA-Polk GA-Chattooga GA-
Bartow GA-
1259 AM EDT Thu Mar 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR PAULDING...HARALSON...FLOYD...
WESTERN GORDON...POLK...CENTRAL CHATTOOGA AND BARTOW COUNTIES WILL
EXPIRE AT 100 AM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Tornado Watch remains in effect until 700 AM EDT for north central
and northwestern Georgia.

LAT...LON 3446 8550 3461 8490 3408 8469 3407 8474
      3380 8472 3377 8486 3381 8505 3372 8505
      3365 8530 3365 8533
TIME...MOT...LOC 0459Z 252DEG 47KT 3449 8481 3386 8476 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 8:01 PM EDT	Severe Thunderstorm Warning	FFC	Houston, Twiggs	29 min
Mar 17, 11:32 PM EDT	River Flood Warning	FFC	Walker	12 hr
Mar 18, 12:23 AM EDT	Flash Flood Warning	FFC	Bartow, Catoosa, Chattooga, Dade, Floyd, Gordon and 4 more	7 hr
Mar 18, 12:44 AM EDT	Special Weather Statement	FFC	Chattahoochee, Harris, Muscogee, Stewart	31 min
Mar 18, 1:01 AM EDT	Special Weather Statement	FFC	Bartow, Cherokee, Haralson, Paulding, Polk	29 min
Mar 18, 2:12 AM EDT	River Flood Warning	FFC	Catoosa	22 hr
Mar 18, 3:21 AM EDT	River Flood Warning	FFC	Murray, Whitfield	47 hr
Mar 18, 4:09 AM EDT	Wind Advisory	FFC	Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 90 more	16 hr
Mar 18, 9:34 AM EDT	Special Weather Statement	FFC	Crisp, Dooly	26 min
Mar 18, 9:57 AM EDT	Special Weather Statement	FFC	Pulaski	33 min
Mar 18, 10:32 AM EDT	Special Weather Statement	FFC	Dodge	28 min
Mar 18, 10:58 AM EDT	Special Weather Statement	FFC	Johnson, Laurens	32 min
Mar 18, 11:07 AM EDT	Special Weather Statement	FFC	Dodge	23 min
Mar 18, 2:38 PM EDT	River Flood Warning	FFC	Gwinnett	3 hr
Mar 18, 7:13 PM EDT	River Flood Warning	FFC	Floyd	20 hr

Nearby

Severe Thunderstorm Warnings in Georgia, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.