Alert archive / Georgia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 159, NWS Atlanta, GA

April 18, 2017DeKalb County, Gwinnett County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 18, 2017, 3:00 PM EDT for DeKalb County, Gwinnett County, Georgia. It was in force for 33 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
Apr 18, 2017, 3:00 PM EDT (19:00 UTC)
Expired
Apr 18, 2017, 3:33 PM EDT
In force
33 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties DeKalb County, GA, Gwinnett County, GA

The radar

The Atlanta radar (KFFC), 72 km from the middle of the area, began a volume at 19:00 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

TimeReportWhereRemark
Apr 18, 3:05 PM EDTHAIL 1Embry Hills, GATHE PUBLIC REPORTED QUARTER SIZED HAIL NEAR THE INTERSECTION OF STONECREST COURT AND CHAMBLEE TUCKER ROAD.

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, 7.0 hours before the alert went out and 69 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 2017-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 96 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2017-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
96 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
1036 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
19 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

482 
WUUS52 KFFC 181900
SVRFFC
GAC089-135-181945-
/O.NEW.KFFC.SV.W.0159.170418T1900Z-170418T1945Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
300 PM EDT TUE APR 18 2017

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Northern DeKalb County in north central Georgia...
  Southwestern Gwinnett County in north central Georgia...

* Until 345 PM EDT

* At 259 PM EDT, a severe thunderstorm was located over Tucker, 
  moving east at 5 mph.

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

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Sandy Springs, Dunwoody, Duluth, Lilburn, Chamblee, Norcross,
  Doraville, Clarkston, Stone Mountain, Berkeley Lake, Pine Lake,
  Tucker, North Decatur, North Atlanta, Mountain Park, Scottdale and
  Mechanicsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud-to-ground 
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

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 3391 8409 3377 8409 3379 8430 3395 8433
      3396 8430 3396 8428 3397 8426 3398 8426
      3400 8421 3399 8420 3399 8419 3402 8417
TIME...MOT...LOC 1859Z 261DEG 7KT 3387 8424 

HAIL...1.00IN
WIND...60MPH
 
$$
1 follow-up statement
563 
WWUS52 KFFC 181933
SVSFFC

Severe Weather Statement
National Weather Service Peachtree City GA
333 PM EDT TUE APR 18 2017

GAC089-135-181940-
/O.CAN.KFFC.SV.W.0159.000000T0000Z-170418T1945Z/
DeKalb GA-Gwinnett GA-
333 PM EDT TUE APR 18 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN DEKALB AND
SOUTHWESTERN GWINNETT COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe 
limits and no longer poses an immediate threat to life or property, 
and therefore, the warning has been cancelled. However small hail, 
gusty winds up to 35 MPH and very heavy rain are still possible with 
this thunderstorm. The thunderstorm was located from Norcross to 
Tucker and was moving east around 5 MPH. 

To report severe weather, contact your nearest law enforcement 
agency, and they will relay your report to the National Weather 
Service in Peachtree City.

LAT...LON 3391 8409 3377 8409 3379 8430 3395 8433
      3396 8430 3396 8428 3397 8426 3398 8426
      3400 8421 3399 8420 3399 8419 3402 8417
TIME...MOT...LOC 1928Z 261DEG 7KT 3388 8417 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 17, 9:40 PM EDTSpecial Weather StatementFFCChattooga35 min
Apr 18, 2:45 PM EDTSpecial Weather StatementFFCDeKalb45 min
Apr 18, 3:17 PM EDTSpecial Weather StatementFFCGlascock, Hancock, Warren28 min
Apr 18, 3:45 PM EDTSpecial Weather StatementFFCFulton45 min
Apr 18, 4:15 PM EDTSpecial Weather StatementFFCWalton45 min
Apr 18, 4:19 PM EDTSpecial Weather StatementFFCTaliaferro, Warren26 min
Apr 18, 4:31 PM EDTSpecial Weather StatementFFCNewton29 min
Apr 18, 4:41 PM EDTSpecial Weather StatementFFCTaliaferro49 min
Apr 18, 4:44 PM EDTSpecial Weather StatementFFCBartow46 min
Apr 18, 4:58 PM EDTSpecial Weather StatementFFCWalton32 min
Apr 18, 5:16 PM EDTSpecial Weather StatementFFCWilkes59 min
Apr 18, 5:28 PM EDTSevere Thunderstorm WarningFFCMorgan, Newton, Walton47 min
Apr 18, 5:31 PM EDTSpecial Weather StatementFFCGreene44 min
Apr 18, 5:37 PM EDTSpecial Weather StatementFFCGordon, Murray, Whitfield38 min
Apr 18, 5:48 PM EDTSpecial Weather StatementFFCWilkes42 min
Apr 18, 6:01 PM EDTSpecial Weather StatementFFCMorgan44 min
Apr 18, 6:09 PM EDTSpecial Weather StatementFFCWalker51 min
Apr 18, 6:19 PM EDTSpecial Weather StatementFFCMurray26 min
Apr 18, 6:37 PM EDTSpecial Weather StatementFFCDade53 min
Apr 18, 7:08 PM EDTSpecial Weather StatementFFCEmanuel52 min
Apr 18, 7:25 PM EDTSpecial Weather StatementFFCDade50 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2017Every severe thunderstorm warning in 2017

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.