Alert archive / Georgia / Special Weather Statements in 2017

Special Weather Statement, NWS Atlanta, GA

July 12, 2017Sumter County, Georgia

NWS Atlanta, GA issued this special weather statement at Jul 12, 2017, 9:35 PM EDT for Sumter County, Georgia. It was in force for 40 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: Jul 12, 2017, 9:35 PM EDT (01:35 UTC)
Expired: Jul 12, 2017, 10:15 PM EDT
In force: 40 min
Issued by: NWS Atlanta, GA
Wind: 40

County Sumter County, GA

The radar

The Robins AFB radar (KJGX), 108 km from the middle of the area, began a volume at 01:38 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

Birmingham, AL (KBMX), launched 00:00Z, 1.6 hours before the alert went out and 276 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: 792 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 1304 m above ground
0-6 km bulk shear: 1 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: -24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Atlanta, GA wrote its last area forecast discussion before this special weather statement went out at Jul 12, 8:00 PM EDT, 1 hour 35 minutes earlier.

Area forecast discussion, Jul 12, 8:00 PM EDT, 1 hour 35 minutes before

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Hazardous weather outlook, Jul 12, 6:30 PM EDT, 3 hours 5 minutes before

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In the hours before

Special weather statement, Jul 12, 4:34 PM EDT, 5 hours 1 minute before

Special Weather Statement
National Weather Service Peachtree City GA
434 PM EDT WED JUL 12 2017

GAZ008-009-015-016-122100-
Union GA-Towns GA-White GA-Lumpkin GA-
434 PM EDT WED JUL 12 2017

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN UNION...SOUTHERN TOWNS...
WHITE AND NORTHEASTERN LUMPKIN COUNTIES UNTIL 500 PM EDT...

At 433 PM EDT...a strong thunderstorm was over Smithgall Woods
Conservation Are, or 8 miles north of Cleveland...moving southeast at
15 mph.

  HAZARD...Winds up to 40 mph...pea sized hail and heavy rain.

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light...unsecured objects. Heavy rain may cause temporary
           street flooding especially in poor drainage areas.

Some locations in the path of this storm include
Cleveland, Helen, Unicoi State Park, Whitley Gap Shelter,
Robertstown, Blue Mountain Shelter, Mossy Creek, Low Gap Shelter,
Camp Coleman Lake, Anna Ruby Falls, Leaf, Smithgall Woods
Conservation Are, Turners Corner, Sautee and Qualatchee Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. Motorists should
slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3481 8368 3479 8368 3476 8363 3473 8362
      3472 8364 3469 8364 3465 8366 3462 8364
      3458 8364 3455 8362 3453 8363 3450 8367
      3450 8371 3464 8395 3486 8382
TIME...MOT...LOC 2033Z 298DEG 13KT 3471 8377

HAIL...0.25IN
WIND...40MPH

Special weather statement, Jul 12, 4:39 PM EDT, 4 hours 56 minutes before

Special Weather Statement
National Weather Service Peachtree City GA
439 PM EDT WED JUL 12 2017

GAZ001-002-122115-
Walker GA-Dade GA-
439 PM EDT WED JUL 12 2017

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN WALKER AND DADE COUNTIES
UNTIL 515 PM EDT...

At 437 PM EDT...a strong thunderstorm was over Trenton...moving
southeast at 15 mph.

  HAZARD...Heavy rain...winds up to 40 mph...and pea sized hail

  IMPACT...Expect minor damage to tree limbs and blowing around of
           light...unsecured objects. Heavy rain may cause temporary
           street flooding especially in poor drainage areas.

Some locations in the path of this storm include
Trenton, Chickamauga, Center Post, Rising Fawn, Wildwood, Fairview,
Stephensville, Chattanooga  Valley, New England, Morganville,
Cloudland Canyon State Park, Hooker and Cooper Heights.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately. Motorists should
slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3496 8527 3486 8526 3485 8524 3459 8534
      3459 8535 3478 8557 3486 8559 3488 8559
      3498 8551 3499 8547
TIME...MOT...LOC 2037Z 298DEG 13KT 3488 8549

HAIL...0.25IN
WIND...40MPH

Special weather statement, Jul 12, 9:35 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 10:06 PM EDT	Special Weather Statement	FFC	Sumter, Webster	39 min
Jul 12, 10:34 PM EDT	Special Weather Statement	FFC	Marion, Schley, Stewart, Webster	41 min
Jul 13, 2:15 PM EDT	Special Weather Statement	FFC	Catoosa, Walker	30 min
Jul 13, 4:46 PM EDT	Special Weather Statement	FFC	Cobb	29 min
Jul 13, 5:24 PM EDT	Special Weather Statement	FFC	Cobb, Forsyth, Gwinnett, Hall	36 min
Jul 13, 5:50 PM EDT	Special Weather Statement	FFC	Dade, Walker	25 min
Jul 13, 5:58 PM EDT	Special Weather Statement	FFC	Cobb, Dawson, DeKalb, Douglas, Forsyth, Fulton and 1 more	32 min
Jul 13, 6:09 PM EDT	Special Weather Statement	FFC	Telfair	36 min
Jul 13, 7:39 PM EDT	Special Weather Statement	FFC	Harris, Muscogee	36 min

Nearby

Special Weather Statements in Georgia, 2017 Every special weather statement 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.