Alert archive / Georgia / Special Weather Statements in 2012

Special Weather Statement, NWS Atlanta, GA

September 18, 2012Chattooga County, Georgia

NWS Atlanta, GA issued this special weather statement at Sep 18, 2012, 6:25 AM EDT for Chattooga County, Georgia. It was in force for 65 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: Sep 18, 2012, 6:25 AM EDT (10:25 UTC)
Expired: Sep 18, 2012, 7:30 AM EDT
In force: 65 min
Issued by: NWS Atlanta, GA

County Chattooga County, GA

The radar

The Northeast Alabama radar (KHTX), 89 km from the middle of the area, began a volume at 10:28 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.

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 10.4 hours before the alert went out and 139 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: 405 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 706 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Sep 18, 3:42 AM EDT, 2 hours 43 minutes earlier.

Area forecast discussion, Sep 18, 3:42 AM EDT, 2 hours 43 minutes before

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Hazardous weather outlook, Sep 18, 5:10 AM EDT, 1 hour 15 minutes before

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In the hours before

Special weather statement, Sep 18, 1:06 AM EDT, 5 hours 19 minutes before

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Special weather statement, Sep 18, 6:25 AM EDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
625 AM EDT TUE SEP 18 2012

GAZ011-019-181130-
625 AM EDT TUE SEP 18 2012

...SIGNIFICANT WEATHER ADVISORY FOR 40 MPH WINDS IN CHATTOOGA AND
FLOYD COUNTIES UNTIL 730 AM EDT...

AT 614 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 25 MILES SOUTHWEST OF CHATTOOGAVILLE...MOVING
NORTHEAST AT 35 MPH.

THE LEADING EDGE OF THIS LINE OF STORMS HAS EXHIBITED AREAS OF
LOCALIZED...WEAK ROTATION...BUT NOTHING STRONG ENOUGH TO INDICATE THE
PRESENCE OF A TORNADO AT 614 AM EDT. WIND GUSTS TO 40 MPH ARE ALSO
POSSIBLE AS THE LINE MOVES ACROSS CHATTOOGA AND FLOYD COUNTIES
THROUGH 730 AM EDT.

SOME LOCATIONS IN THE PATH OF THESE STORMS INCLUDE COOSA...
CHATTOOGAVILLE...LYERLY...MENLO...HOLLAND...BERRYTON...JAMES H. FLOYD
STATE PARK...SUMMERVILLE...ARMUCHEE...TIDINGS AND TRION.

EVERYONE IN THIS AREA IS URGED TO REMAIN INDOORS AND BE ALERT TO THE
POSSIBILITY OF LOCALIZED WIND DAMAGE.

&&

LAT...LON 3459 8538 3453 8513 3432 8512 3416 8544
      3417 8545 3447 8551
TIME...MOT...LOC 1024Z 230DEG 30KT 3415 8570

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 12:21 AM EDT	Special Weather Statement	FFC	Johnson, Laurens, Wilkinson	24 min
Sep 18, 1:06 AM EDT	Special Weather Statement	FFC	Dade	54 min
Sep 18, 3:27 AM EDT	River Flood Warning	FFC	Dade	15 hr
Sep 18, 7:18 AM EDT	Special Weather Statement	FFC	Marion, Schley, Webster	42 min
Sep 18, 7:52 AM EDT	Special Weather Statement	FFC	Crawford, Macon, Peach, Schley	38 min
Sep 18, 8:22 AM EDT	Special Weather Statement	FFC	Baldwin, Jones	23 min
Sep 18, 11:33 AM EDT	Special Weather Statement	FFC	Coweta, Troup	27 min
Sep 18, 11:57 AM EDT	Special Weather Statement	FFC	Clayton, Coweta, Fayette	33 min
Sep 18, 1:29 PM EDT	Special Weather Statement	FFC	Butts, Spalding	46 min
Sep 18, 2:16 PM EDT	Special Weather Statement	FFC	Monroe, Upson	29 min
Sep 18, 2:46 PM EDT	Special Weather Statement	FFC	Bibb, Jones, Monroe	29 min
Sep 18, 3:42 PM EDT	Special Weather Statement	FFC	Hancock, Putnam	48 min

Nearby

Special Weather Statements in Georgia, 2012 Every special weather statement in 2012

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.