Alert archive / Georgia / Special Weather Statements in 2021

Special Weather Statement, NWS Atlanta, GA

June 30, 2021Johnson County, Georgia

NWS Atlanta, GA issued this special weather statement at Jun 30, 2021, 4:17 PM EDT for Johnson County, Georgia. It was in force for 28 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: Jun 30, 2021, 4:17 PM EDT (20:17 UTC)
Expired: Jun 30, 2021, 4:45 PM EDT
In force: 28 min
Issued by: NWS Atlanta, GA
Wind: 40

County Johnson County, GA

The radar

The Robins AFB radar (KJGX), 83 km from the middle of the area, began a volume at 20:18 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 nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.3 hours before the alert went out and 198 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: 396 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 954 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

447 
WWUS82 KFFC 302017
SPSFFC

Special Weather Statement
National Weather Service Peachtree City GA
417 PM EDT Wed Jun 30 2021
 
GAZ074-076-085-302045-
Jefferson GA-Washington GA-Johnson GA-
417 PM EDT Wed Jun 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN JEFFERSON...
SOUTHEASTERN WASHINGTON AND NORTHEASTERN JOHNSON COUNTIES UNTIL 445
PM EDT...

At 417 PM EDT...a line of strong thunderstorms was along a line
extending from near Donovan to near Bartow...and moving north at 10
mph.

  HAZARD...Up to 40 mph wind...frequent cloud to ground lightning 
           and heavy rain.

  IMPACT...Expect minor damage to tree limbs and blowing around of 
           light...unsecured objects. Heavy rain may cause temporary 
           street flooding especially in poor drainage areas.

Some locations in the path of these storms include
Wrightsville, Wadley, Harrison, Bartow, Riddleville, Moxley, Donovan,
New Home and Pringle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. If you can hear
thunder...you are close enough to be struck by lightning. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3282 8236 3281 8242 3278 8240 3276 8243
      3275 8244 3273 8278 3292 8284 3294 8229
TIME...MOT...LOC 2017Z 197DEG 9KT 3278 8276 3282 8246 

WIND...40MPH

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 8:12 PM EDT	Special Weather Statement	FFC	Houston	33 min
Jun 29, 8:33 PM EDT	Special Weather Statement	FFC	Twiggs	27 min
Jun 30, 2:37 PM EDT	Special Weather Statement	FFC	Telfair	23 min
Jun 30, 3:02 PM EDT	Special Weather Statement	FFC	Stewart	28 min
Jun 30, 3:07 PM EDT	Special Weather Statement	FFC	Treutlen	23 min
Jun 30, 3:30 PM EDT	Special Weather Statement	FFC	Pulaski	30 min
Jun 30, 3:36 PM EDT	Special Weather Statement	FFC	Emanuel	24 min
Jun 30, 4:12 PM EDT	Special Weather Statement	FFC	Peach, Twiggs	33 min
Jun 30, 4:42 PM EDT	Special Weather Statement	FFC	Crisp	33 min
Jun 30, 4:54 PM EDT	Special Weather Statement	FFC	Peach	21 min
Jun 30, 5:28 PM EDT	Special Weather Statement	FFC	Jackson	32 min
Jun 30, 6:12 PM EDT	Special Weather Statement	FFC	Barrow	33 min
Jun 30, 6:46 PM EDT	Special Weather Statement	FFC	Gwinnett	14 min
Jun 30, 7:11 PM EDT	Special Weather Statement	FFC	Forsyth	19 min

Nearby

Special Weather Statements in Georgia, 2021 Every special weather statement 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.