Alert archive / Georgia / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 48, NWS Atlanta, GA

May 20, 2018Heard County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at May 20, 2018, 8:04 PM EDT for Heard County, Georgia. It was in force for 26 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: May 20, 2018, 8:04 PM EDT (00:04 UTC)
Expired: May 20, 2018, 8:30 PM EDT
In force: 26 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Heard County, GA

The radar

The Atlanta radar (KFFC), 59 km from the middle of the area, began a volume at 00:08 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
May 20, 8:10 PM EDT	TSTM WND DMG	3 Se Ephesus, GA	MULTIPLE TREES DOWN ALONG DEER CREEK CIR. THEY ALSO REPORTED PENNY TO QUARTER SIZE HAIL.

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 00:00Z, 0.1 hours before the alert went out and 65 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: 1438 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 705 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: -49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

609 
WUUS52 KFFC 210004
SVRFFC
GAC149-210030-
/O.NEW.KFFC.SV.W.0048.180521T0004Z-180521T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
804 PM EDT SUN MAY 20 2018

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Northwestern Heard County in west central Georgia...

* Until 830 PM EDT.

* At 804 PM EDT, a severe thunderstorm was located over Frolona, or 8
  miles northwest of Franklin, moving west at 20 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Ephesus, Centralhatchee, Frolona and Roosterville. 

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 3343 8522 3340 8511 3331 8512 3331 8527
      3343 8529
TIME...MOT...LOC 0004Z 095DEG 19KT 3336 8520 

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

1 follow-up statement

156 
WWUS52 KFFC 210024
SVSFFC

Severe Weather Statement
National Weather Service Peachtree City GA
824 PM EDT SUN MAY 20 2018

GAC149-210034-
/O.EXP.KFFC.SV.W.0048.000000T0000Z-180521T0030Z/
Heard GA-
824 PM EDT SUN MAY 20 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN HEARD COUNTY WILL
EXPIRE AT 830 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3343 8522 3340 8511 3331 8512 3331 8527
      3343 8529
TIME...MOT...LOC 0024Z 095DEG 19KT 3337 8532 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 8:01 PM EDT	Special Weather Statement	FFC	Troup	29 min
May 21, 2:49 PM EDT	Special Weather Statement	FFC	Dodge	26 min
May 21, 3:12 PM EDT	Special Weather Statement	FFC	Bleckley	33 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2018 Every severe thunderstorm warning in 2018

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.