Alert archive / Georgia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 82, NWS Atlanta, GA

March 21, 2017Greene County, Oconee County, Oglethorpe County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Mar 21, 2017, 8:49 PM EDT for Greene County, Oconee County, Oglethorpe County, Georgia. It was in force for 41 min. 2 reports 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: Mar 21, 2017, 8:49 PM EDT (00:49 UTC)
Expired: Mar 21, 2017, 9:30 PM EDT
In force: 41 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Greene County, GA, Oconee County, GA, Oglethorpe County, GA

The radar

The Robins AFB radar (KJGX), 126 km from the middle of the area, began a volume at 00:50 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
Mar 21, 9:06 PM EDT	TSTM WND DMG	1 Ese Birchmore, GA	SHERIFFS OFFICE REPORTED NUMEROUS DOWN TREES ACROSS THE COUNTY. THE FIRST TREES WERE DOWNED AT 906PM IN THE NORTHERN PORTION OF THE COUNTY... NEAR BIRCHMORE... AND CONTINUED TO APPROXIMATELY 930PM IN THE SOUTHERN PORTION OF THE COUNTY. THE REPORTS SPREAD TO SP
Mar 21, 9:06 PM EDT	TSTM WND DMG	1 Ese Birchmore, GA	SHERIFFS OFFICE REPORTED NUMEROUS DOWN TREES ACROSS THE COUNTY. THE FIRST TREES WERE DOWNED AT 906PM IN THE NORTHERN PORTION OF THE COUNTY... NEAR BIRCHMORE... AND CONTINUED TO APPROXIMATELY 930PM IN THE SOUTHERN PORTION OF THE COUNTY. THE REPORTS SPREAD TO SP

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 21, 3:33 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.8 hours before the alert went out and 130 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: 377 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 2348 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

576 
WUUS52 KFFC 220049
SVRFFC
GAC133-219-221-220130-
/O.NEW.KFFC.SV.W.0082.170322T0049Z-170322T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
849 PM EDT TUE MAR 21 2017

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Eastern Oconee County in northeastern Georgia...
  Northeastern Greene County in east central Georgia...
  Southwestern Oglethorpe County in northeastern Georgia...

* Until 930 PM EDT

* At 849 PM EDT, a severe thunderstorm was located near Barnett
  Shoals, or 9 miles southwest of Lexington, moving east at 30 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...
  Watkinsville, Lexington, Union Point, Crawford, North High Shoals,
  Woodville, Bishop, Maxeys, Stephens, Hutchings, Barnett Shoals,
  Daniel Springs, Penfield and Philomath.

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 3369 8300 3367 8296 3354 8305 3383 8350
      3393 8343 3392 8341 3387 8336 3387 8333
      3386 8333 3385 8331 3385 8328 3389 8324
      3384 8295 3379 8298 3373 8295
TIME...MOT...LOC 0049Z 277DEG 25KT 3380 8325 

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

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 21, 8:00 PM EDT	Special Weather Statement	FFC	Walton	30 min
Mar 21, 8:02 PM EDT	Severe Thunderstorm Warning	FFC	Banks, Jackson, Madison	31 min
Mar 21, 8:07 PM EDT	Severe Thunderstorm Warning	FFC	Dawson, Fannin, Gilmer, Hall, Lumpkin, Pickens and 3 more	38 min
Mar 21, 8:08 PM EDT	Severe Thunderstorm Warning	FFC	Morgan, Oconee, Walton	52 min
Mar 21, 8:14 PM EDT	Severe Thunderstorm Warning	FFC	Bartow, Cherokee, Cobb, Dawson, Floyd, Forsyth and 3 more	46 min
Mar 21, 8:19 PM EDT	Flash Flood Warning	FFC	Clarke, Greene, Oconee, Oglethorpe, Taliaferro, Wilkes	6 hr
Mar 21, 8:30 PM EDT	Special Weather Statement	FFC	Oglethorpe	45 min
Mar 21, 8:40 PM EDT	Severe Thunderstorm Warning	FFC	Carroll, Clayton, Cobb, DeKalb, Douglas, Forsyth and 5 more	50 min
Mar 21, 8:44 PM EDT	Severe Thunderstorm Warning	FFC	Banks, Barrow, Forsyth, Gwinnett, Hall, Jackson and 2 more	46 min
Mar 21, 9:20 PM EDT	Special Weather Statement	FFC	Butts, Clayton, Coweta, Fayette, Heard, Henry and 8 more	40 min
Mar 21, 9:22 PM EDT	Severe Thunderstorm Warning	FFC	Barrow, Clarke, Greene, Jackson, Madison, Morgan and 5 more	38 min
Mar 21, 9:45 PM EDT	Severe Thunderstorm Warning	FFC	Glascock, Greene, Hancock, Morgan, Oglethorpe, Putnam and 4 more	45 min
Mar 21, 9:53 PM EDT	Special Weather Statement	FFC	Baldwin, Butts, Harris, Jasper, Jones, Lamar and 7 more	52 min
Mar 21, 10:24 PM EDT	Special Weather Statement	FFC	Baldwin, Glascock, Hancock, Jefferson, Jones, Washington	36 min
Mar 21, 10:55 PM EDT	Special Weather Statement	FFC	Emanuel, Johnson, Wilkinson	50 min
Mar 21, 11:51 PM EDT	Special Weather Statement	FFC	Montgomery, Toombs	39 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2017 Every 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.