Alert archive / Georgia / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Atlanta, GA

January 11, 20206 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Jan 11, 2020, 7:14 PM EST for 6 counties in Georgia. It was in force for 46 min. 3 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: Jan 11, 2020, 7:14 PM EST (00:14 UTC)
Expired: Jan 11, 2020, 8:00 PM EST
In force: 46 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Dooly County, GA, Houston County, GA, Macon County, GA, Peach County, GA, Sumter County, GA, Twiggs County, GA

The radar

The Robins AFB radar (KJGX), 69 km from the middle of the area, began a volume at 00:17 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
Jan 11, 7:15 PM EST	TSTM WND DMG	Whitewater State Park, GA	A TREE WAS DOWNED ON WHITEWATER RD NEAR WHITEWATER CREEK PARK.
Jan 11, 7:36 PM EST	TSTM WND DMG	1 Ese Henderson, GA	A TREE WAS DOWNED ON I-75 AT MILE MARKER 127 NEAR THE GA-26 EXIT.
Jan 11, 7:42 PM EST	TSTM WND DMG	2 W Sand Bed, GA	A POWER LINE WAS DOWNED ON THE 400 BLOCK OF ARENA ROAD.

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
Jan 11, 1:42 PM EST	Tornado Watch	SPC	7 hr
Jan 11, 5:38 PM EST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 0.2 hours before the alert went out and 209 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: 270 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 326 m²/s²
0-3 km storm-relative helicity: 364 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

423 
WUUS52 KFFC 120014
SVRFFC
GAC093-153-193-225-261-289-120100-
/O.NEW.KFFC.SV.W.0021.200112T0014Z-200112T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
714 PM EST Sat Jan 11 2020

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Macon County in west central Georgia...
  Southwestern Twiggs County in central Georgia...
  Dooly County in central Georgia...
  Southern Peach County in central Georgia...
  Houston County in central Georgia...
  Sumter County in west central Georgia...

* Until 800 PM EST.

* At 714 PM EST, severe thunderstorms were located along a line
  extending from Nakomis to near Montezuma to near Croxton
  Crossroads, moving northeast at 60 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Americus, Perry, Fort Valley, Vienna, Oglethorpe, Warner Robins,
  Unadilla, Montezuma, Marshallville, Byromville, Pinehurst, Leslie,
  Lilly, De Soto, Dooling, Desoto, Robins Air Force Base, Cobb,
  Sumter and Lamar.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM EST for central and
west central Georgia. A Tornado Watch also remains in effect until
midnight EST for central Georgia.

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 3193 8440 3195 8442 3221 8410 3251 8406
      3250 8402 3252 8401 3264 8341 3248 8344
      3245 8350 3241 8348 3240 8352 3229 8361
      3225 8361 3203 8389 3203 8396 3198 8394
      3193 8401
TIME...MOT...LOC 0014Z 245DEG 51KT 3255 8397 3225 8401 3199 8433 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 11, 7:22 PM EST	Special Weather Statement	FFC	Baldwin, Greene, Hancock, Jones, Taliaferro, Wilkes	38 min
Jan 11, 7:43 PM EST	Severe Thunderstorm Warning	FFC	Baldwin, Bibb, Jones, Twiggs, Washington, Wilkinson	47 min
Jan 11, 7:54 PM EST	Severe Thunderstorm Warning	FFC	Bleckley, Dodge, Houston, Laurens, Pulaski, Twiggs and 1 more	51 min
Jan 11, 7:56 PM EST	Special Weather Statement	FFC	Glascock, Hancock, Taliaferro, Warren, Wilkes	49 min
Jan 11, 7:58 PM EST	Special Weather Statement	FFC	Crisp, Dodge, Pulaski, Wilcox	62 min
Jan 11, 8:01 PM EST	Severe Thunderstorm Warning	FFC	Wilkes	29 min
Jan 11, 8:07 PM EST	Tornado Warning	FFC	Wilkes	13 min
Jan 11, 8:16 PM EST	Special Weather Statement	FFC	Houston	14 min
Jan 11, 8:20 PM EST	Severe Thunderstorm Warning	FFC	Baldwin, Glascock, Hancock, Jefferson, Taliaferro, Warren and 2 more	40 min
Jan 11, 8:30 PM EST	Special Weather Statement	FFC	Johnson, Washington	30 min
Jan 11, 9:00 PM EST	Special Weather Statement	FFC	Jefferson, Johnson	30 min
Jan 11, 9:02 PM EST	Special Weather Statement	FFC	Wilcox	28 min
Jan 11, 9:27 PM EST	Special Weather Statement	FFC	Dodge, Telfair, Wheeler	48 min
Jan 11, 10:02 PM EST	Special Weather Statement	FFC	Emanuel, Treutlen	28 min
Jan 11, 10:16 PM EST	Special Weather Statement	FFC	Montgomery, Telfair, Wheeler	44 min
Jan 11, 10:40 PM EST	Special Weather Statement	FFC	Toombs	35 min
Jan 12, 1:19 AM EST	Special Weather Statement	FFC	Emanuel, Montgomery	26 min
Jan 12, 3:11 PM EST	Special Weather Statement	FFC	Emanuel	34 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2020 Every severe thunderstorm warning in 2020

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.