Alert archive / Georgia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 78, NWS Atlanta, GA

March 21, 2017Morgan County, Oconee County, Walton County, Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Mar 21, 2017, 8:08 PM EDT for Morgan County, Oconee County, Walton County, Georgia. It was in force for 52 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: Mar 21, 2017, 8:08 PM EDT (00:08 UTC)
Expired: Mar 21, 2017, 9:00 PM EDT
In force: 52 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Morgan County, GA, Oconee County, GA, Walton County, GA

The radar

The Atlanta radar (KFFC), 112 km from the middle of the area, began a volume at 00:08 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 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, 0.1 hours before the alert went out and 106 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.

655 
WUUS52 KFFC 220008
SVRFFC
GAC211-219-297-220100-
/O.NEW.KFFC.SV.W.0078.170322T0008Z-170322T0100Z/

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

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Oconee County in northeastern Georgia...
  North central Morgan County in north central Georgia...
  Northeastern Walton County in north central Georgia...

* Until 900 PM EDT

* At 807 PM EDT, a severe thunderstorm was located over Gratis, or
  near Monroe, moving east at 35 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...
  Monroe, Watkinsville, North High Shoals, Bostwick, Good Hope,
  Bishop, Gratis, Eastville and Farmington.

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 3380 8329 3374 8329 3372 8332 3370 8343
      3381 8380 3391 8366 3391 8365 3393 8360
TIME...MOT...LOC 0007Z 288DEG 32KT 3385 8363 

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

1 follow-up statement

542 
WWUS52 KFFC 220054
SVSFFC

Severe Weather Statement
National Weather Service Peachtree City GA
854 PM EDT TUE MAR 21 2017

GAC211-219-297-220104-
/O.EXP.KFFC.SV.W.0078.000000T0000Z-170322T0100Z/
Oconee GA-Morgan GA-Walton GA-
854 PM EDT TUE MAR 21 2017

...THE SEVERE THUNDERSTORM WARNING FOR OCONEE...NORTH CENTRAL MORGAN
AND NORTHEASTERN WALTON COUNTIES WILL EXPIRE AT 900 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire.

A severe thunderstorm watch remains in effect until 1100 PM EDT for
north central, northeastern and east central Georgia.

LAT...LON 3380 8329 3374 8329 3372 8332 3370 8343
      3381 8380 3391 8366 3391 8365 3393 8360
TIME...MOT...LOC 0054Z 288DEG 32KT 3374 8323 

$$

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, 8:14 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, 8:49 PM EDT	Severe Thunderstorm Warning	FFC	Greene, Oconee, Oglethorpe	41 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.