Alert archive / Georgia / Special Weather Statements in 2018

Special Weather Statement, NWS Atlanta, GA

May 29, 2018Chattooga County, Dade County, Walker County, Georgia

NWS Atlanta, GA issued this special weather statement at May 29, 2018, 7:48 PM EDT for Chattooga County, Dade County, Walker County, Georgia. It was in force for 27 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
May 29, 2018, 7:48 PM EDT (23:48 UTC)
Expired
May 29, 2018, 8:15 PM EDT
In force
27 min
Issued by
NWS Atlanta, GA

Counties Chattooga County, GA, Dade County, GA, Walker County, GA

The radar

The Northeast Alabama radar (KHTX), 74 km from the middle of the area, began a volume at 23:51 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 11.8 hours before the alert went out and 160 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 2018-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 347 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2018-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 213 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
347 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
475 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
213 m²/s²
0-3 km storm-relative helicity
245 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.0

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 May 29, 7:33 PM EDT, 15 minutes earlier.

Area forecast discussion, May 29, 7:33 PM EDT, 15 minutes before
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Hazardous weather outlook, May 29, 3:28 PM EDT, 4 hours 20 minutes before
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In the hours before

Special weather statement, May 29, 2:55 PM EDT, 4 hours 53 minutes before
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Special weather statement, May 29, 3:24 PM EDT, 4 hours 24 minutes before
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Special weather statement, May 29, 3:36 PM EDT, 4 hours 12 minutes before
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Special weather statement, May 29, 7:48 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Peachtree City GA
748 PM EDT TUE MAY 29 2018

GAZ001-002-011-300015-
Chattooga GA-Walker GA-Dade GA-
748 PM EDT TUE MAY 29 2018

...SIGNIFICANT WEATHER ADVISORY FOR CHATTOOGA...WALKER AND DADE
COUNTIES UNTIL 815 PM EDT...

At 748 PM EDT...a strong thunderstorm was near Center Post, or 10
miles southwest of Lafayette...moving north at 25 mph.

  HAZARD...Frequent cloud to ground lightning and heavy rain.

  IMPACT...Lightning is one of nature's leading killers. If you can
           hear thunder...you are close enough to be struck by
           lightning. Heavy rain may cause temporary street flooding
           especially in poor drainage areas.

Some locations in the path of this storm include
Lafayette, Summerville, Trenton, Fort Oglethorpe, Chickamauga, Trion,
Lookout Mountain, Lyerly, Menlo, Center Post, Fairview, Linwood,
Cloudland, Chattanooga  Valley, Cloudland Canyon State Park, Hooker,
Cooper Heights, James H. Floyd State Park, Holland and Rising Fawn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately.  Electrical
appliances should not be used unless in an emergency. Motorists
should slow down and be prepared for possible loss of control due to
hydroplaning.

LAT...LON 3498 8526 3439 8528 3437 8534 3429 8538
      3430 8547 3498 8560
TIME...MOT...LOC 2348Z 184DEG 22KT 3464 8545

The office that day

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

IssuedProductOfficeCountiesLasted
May 28, 9:08 PM EDTSpecial Weather StatementFFCOglethorpe37 min
May 28, 9:26 PM EDTSpecial Weather StatementFFCWilkes34 min
May 28, 9:29 PM EDTSpecial Weather StatementFFCBanks, Jackson, Madison31 min
May 28, 9:34 PM EDTSevere Thunderstorm WarningFFCBanks, Hall, Jackson41 min
May 29, 2:55 PM EDTSpecial Weather StatementFFCChattahoochee, Stewart35 min
May 29, 3:24 PM EDTSpecial Weather StatementFFCToombs36 min
May 29, 3:36 PM EDTSpecial Weather StatementFFCChattahoochee, Muscogee, Stewart24 min

Nearby

Special Weather Statements in Georgia, 2018Every special weather statement in 2018

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.