Alert archive / Georgia / Special Weather Statements in 2021

Special Weather Statement, NWS Atlanta, GA

July 23, 2021DeKalb County, Georgia

NWS Atlanta, GA issued this special weather statement at Jul 23, 2021, 5:11 PM EDT for DeKalb County, Georgia. It was in force for 34 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 23, 2021, 5:11 PM EDT (21:11 UTC)
Expired: Jul 23, 2021, 5:45 PM EDT
In force: 34 min
Issued by: NWS Atlanta, GA
Wind: 40

County DeKalb County, GA

The radar

The Atlanta radar (KFFC), 44 km from the middle of the area, began a volume at 21:15 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 23, 5:30 PM EDT	TSTM WND DMG	1 E Grant Park-Zoo Atla, GA	NUMEROUS TREES REPORTED DOWN WITHIN THE GRANT PARK/GLENWOOD PARK/ORMEWOOD PARK/EAST ATLANTA VILLIAGE NEIGHBORHOODS IN EAST ATLANTA.

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, 9.2 hours before the alert went out and 40 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: 158 J/kg
Mixed-layer CIN: -159 J/kg
Mixed-layer LCL: 1211 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

968 
WWUS82 KFFC 232111
SPSFFC

Special Weather Statement
National Weather Service Peachtree City GA
511 PM EDT Fri Jul 23 2021
 
GAZ033-045-232145-
North Fulton GA-DeKalb GA-
511 PM EDT Fri Jul 23 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH FULTON AND SOUTHWESTERN
DEKALB COUNTIES UNTIL 545 PM EDT...

At 511 PM EDT...a strong thunderstorm was over Grant Park-Zoo
Atlanta, or near Atlanta. This storm was nearly stationary.

  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 this storm include
Atlanta, Decatur, Avondale Estates, Grant Park-Zoo Atlanta, Belvedere
Park, Candler-Mcafee, Druid Hills, West End, Sweet Auburn, Turner
Field, Kirkwood, Lakewood Park, Panthersville, East Lake, Gresham
Park and Little Five Points.

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 3376 8444 3379 8431 3372 8420 3365 8425
      3365 8435 3366 8436 3367 8439
TIME...MOT...LOC 2111Z 324DEG 3KT 3371 8435 

WIND...40MPH

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 12:59 PM EDT	Special Weather Statement	FFC	Twiggs	31 min
Jul 23, 1:33 PM EDT	Severe Thunderstorm Warning	FFC	Houston, Twiggs	42 min
Jul 23, 1:58 PM EDT	Special Weather Statement	FFC	Houston	32 min
Jul 23, 2:29 PM EDT	Special Weather Statement	FFC	Dooly	31 min
Jul 23, 2:33 PM EDT	Special Weather Statement	FFC	Bibb	27 min
Jul 23, 2:56 PM EDT	Special Weather Statement	FFC	Wilcox	34 min
Jul 23, 3:36 PM EDT	Special Weather Statement	FFC	Jones	24 min
Jul 23, 4:04 PM EDT	Severe Thunderstorm Warning	FFC	Lamar, Pike, Upson	41 min
Jul 23, 4:12 PM EDT	Special Weather Statement	FFC	Forsyth	33 min
Jul 23, 5:26 PM EDT	Severe Thunderstorm Warning	FFC	DeKalb, Fulton	34 min
Jul 23, 5:51 PM EDT	Special Weather Statement	FFC	DeKalb	24 min
Jul 23, 6:07 PM EDT	Special Weather Statement	FFC	DeKalb	38 min
Jul 23, 6:10 PM EDT	Special Weather Statement	FFC	Forsyth	35 min
Jul 23, 6:22 PM EDT	Flash Flood Warning	FFC	DeKalb, Fulton	4 hr
Jul 23, 6:46 PM EDT	Flash Flood Warning	FFC	DeKalb	4 hr
Jul 23, 7:01 PM EDT	River Flood Warning	FFC	DeKalb	96 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.