Alert archive / Georgia / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 49, NWS Atlanta, GA

March 10, 20174 counties in Georgia

NWS Atlanta, GA issued this severe thunderstorm warning at Mar 10, 2017, 3:28 AM EST for 4 counties in Georgia. It was in force for 32 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 10, 2017, 3:28 AM EST (08:28 UTC)
Expired: Mar 10, 2017, 4:00 AM EST
In force: 32 min
Issued by: NWS Atlanta, GA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cherokee County, GA, Forsyth County, GA, Gwinnett County, GA, Hall County, GA

The radar

The Atlanta radar (KFFC), 103 km from the middle of the area, began a volume at 08:28 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 10, 3:37 AM EST	TSTM WND DMG	1 E Mars Hill Crossroad, GA	A COUPLE OF TREES WERE BLOWN DOWN AT GEORGIA 400 INTERSECTION WITH HIGHWAY 141.
Mar 10, 3:39 AM EST	TSTM WND DMG	3 Se Cumming, GA	A TREE WAS BLOWN DOWN ON BUFORD DAM 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
Mar 10, 12:18 AM EST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 8.5 hours before the alert went out and 101 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2857 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

355 
WUUS52 KFFC 100828
SVRFFC
GAC057-117-135-139-100900-
/O.NEW.KFFC.SV.W.0049.170310T0828Z-170310T0900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Peachtree City GA
328 AM EST FRI MAR 10 2017

The National Weather Service in Peachtree City has issued a

* Severe Thunderstorm Warning for...
  Northeastern Cherokee County in north central Georgia...
  Forsyth County in north central Georgia...
  Northeastern Gwinnett County in north central Georgia...
  Southern Hall County in north central Georgia...

* Until 400 AM EST

* At 328 AM EST, a severe thunderstorm was located over Lathemtown,
  or 9 miles east of Canton, moving east at 55 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...
  Gainesville, Cumming, Sugar Hill, Suwanee, Buford, Braselton,
  Flowery Branch, Oakwood, Ball Ground, Rest Haven, Free Home,
  Buffington, Candler, Drew, Buford Dam-Lake Lanier Parks, Coal
  Mountain, Hightower, Matt, Road Atlanta-Lanier Speedway and
  Lathemtown.

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 3434 8426 3433 8426 3434 8425 3434 8419
      3422 8371 3413 8382 3401 8387 3414 8426
      3419 8426 3419 8433 3417 8436 3420 8445
      3437 8438
TIME...MOT...LOC 0828Z 288DEG 47KT 3426 8433 

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 10, 1:36 AM EST	Severe Thunderstorm Warning	FFC	Catoosa, Chattooga, Dade, Walker	39 min
Mar 10, 2:12 AM EST	Special Weather Statement	FFC	Chattooga, Murray, Whitfield	48 min
Mar 10, 2:35 AM EST	Special Weather Statement	FFC	Bartow, Fannin, Floyd, Gilmer, Gordon, Pickens	40 min
Mar 10, 3:11 AM EST	Special Weather Statement	FFC	Carroll, Cherokee, Cobb, Dawson, Douglas, Forsyth and 9 more	34 min
Mar 10, 3:39 AM EST	Special Weather Statement	FFC	Banks, Barrow, Carroll, Clayton, Cobb, DeKalb and 10 more	51 min
Mar 10, 4:13 AM EST	Special Weather Statement	FFC	Barrow, Butts, Clarke, Clayton, Coweta, DeKalb and 20 more	62 min
Mar 10, 4:52 AM EST	Severe Thunderstorm Warning	FFC	Troup	21 min
Mar 10, 4:57 AM EST	Severe Thunderstorm Warning	FFC	Butts, Jasper, Monroe	21 min
Mar 10, 5:12 AM EST	Special Weather Statement	FFC	Baldwin, Bibb, Chattahoochee, Crawford, Glascock, Greene and 21 more	48 min
Mar 10, 5:55 AM EST	Special Weather Statement	FFC	Bleckley, Chattahoochee, Crawford, Crisp, Dodge, Dooly and 20 more	50 min
Mar 10, 6:37 AM EST	Special Weather Statement	FFC	Bleckley, Crisp, Dodge, Dooly, Emanuel, Johnson and 10 more	38 min
Mar 10, 7:09 AM EST	Special Weather Statement	FFC	Montgomery, Telfair, Toombs, Wheeler, Wilcox	51 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.