Alert archive / Georgia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 175, NWS Atlanta, GA

April 29, 2017Lumpkin County, Union County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Apr 29, 2017, 8:00 PM EDT for Lumpkin County, Union County, Georgia. It was in force for 30 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
Apr 29, 2017, 8:00 PM EDT (00:00 UTC)
Expired
Apr 29, 2017, 8:30 PM EDT
In force
30 min
Issued by
NWS Atlanta, GA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Lumpkin County, GA, Union County, GA

The radar

The Greer radar (KGSP), 156 km from the middle of the area, began a volume at 00:02 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 00:00Z, 0.0 hours before the alert went out and 156 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 00:00Z on 2017-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 725 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 00:00Z on 2017-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 square meters per square second.193958Sfc1 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
725 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1658 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.5

Open this sounding in Storm Lab

The text

As transmitted.

149 
WUUS52 KFFC 300000
SVRFFC
GAC187-291-300030-
/O.NEW.KFFC.SV.W.0175.170430T0000Z-170430T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
800 PM EDT SAT APR 29 2017

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Central Lumpkin County in north central Georgia...
  Southern Union County in north central Georgia...

* Until 830 PM EDT

* At 800 PM EDT, a severe thunderstorm was located near Dahlonega,
  moving north at 20 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...
  Dahlonega, Suches, Camp Merrill, Vogel State Park, Garland, Porter
  Springs, Turners Corner, Woods Hole Shelter, Blood Mountain
  Shelter, Gaddistown, Gooch Mountain Shelter and Low Gap Shelter.

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 3479 8381 3477 8383 3475 8382 3473 8383
      3472 8386 3470 8386 3468 8387 3462 8388
      3461 8386 3458 8386 3451 8389 3452 8410
      3472 8411 3473 8409 3479 8409
TIME...MOT...LOC 0000Z 188DEG 18KT 3458 8399 

HAIL...1.00IN
WIND...60MPH
 
$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 8:29 PM EDTSpecial Weather StatementFFCTowns, Union31 min
Apr 30, 3:30 AM EDTWind AdvisoryFFCCatoosa, Dade, Dawson, Fannin, Gilmer, Lumpkin and 7 more41 hr
Apr 30, 5:10 PM EDTSpecial Weather StatementFFCChattooga, Dade, Walker50 min
Apr 30, 6:03 PM EDTSpecial Weather StatementFFCCatoosa, Chattooga, Floyd, Walker27 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.