Alert archive / Georgia / Special Weather Statements in 2018

Special Weather Statement, NWS Atlanta, GA

September 24, 2018Catoosa County, Georgia

NWS Atlanta, GA issued this special weather statement at Sep 24, 2018, 10:01 PM EDT for Catoosa County, Georgia. It was in force for 29 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 24, 2018, 10:01 PM EDT (02:01 UTC)
Expired: Sep 24, 2018, 10:30 PM EDT
In force: 29 min
Issued by: NWS Atlanta, GA
Wind: 50

County Catoosa County, GA

The radar

The Northeast Alabama radar (KHTX), 93 km from the middle of the area, began a volume at 02:05 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

Nashville Metro, TN (KBNA), launched 00:00Z, 2.0 hours before the alert went out and 193 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: 366 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 204 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.9

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 Sep 24, 9:32 PM EDT, 29 minutes earlier.

Area forecast discussion, Sep 24, 9:32 PM EDT, 29 minutes before

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Hazardous weather outlook, Sep 24, 9:45 PM EDT, 16 minutes before

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In the hours before

Special weather statement, Sep 24, 8:39 PM EDT, 1 hour 22 minutes before

Special Weather Statement
National Weather Service Peachtree City GA
839 PM EDT MON SEP 24 2018

GAZ011-250115-
Chattooga GA-
839 PM EDT MON SEP 24 2018

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CHATTOOGA COUNTY UNTIL
915 PM EDT...

At 839 PM EDT...National Weather Service doppler radar indicated a
strong thunderstorm over Broomtown, or near Little River Canyon
National Preserve...moving northeast at 30 mph.

  HAZARD...40 to 50 mph wind and enhanced risk of a brief tornado.

  IMPACT...While winds should result in minor damage to tree limbs
           and blowing around of light...unsecured objects...this
           storm has also exhibited localized rotation. A brief
           tornado could quickly form.

Some locations in the path of this storm include
Summerville, Lyerly, Menlo, Cloudland, Berryton, Chattoogaville,
James H. Floyd State Park and Holland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

People outdoors should seek shelter immediately.

LAT...LON 3444 8525 3437 8532 3437 8534 3433 8537
      3429 8541 3429 8546 3458 8552
TIME...MOT...LOC 0039Z 211DEG 24KT 3435 8552

WIND...50MPH

Special weather statement, Sep 24, 9:01 PM EDT, 1 hour before

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Special weather statement, Sep 24, 9:11 PM EDT, 50 minutes before

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Special weather statement, Sep 24, 9:32 PM EDT, 29 minutes before

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Special weather statement, Sep 24, 9:34 PM EDT, 27 minutes before

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Special weather statement, Sep 24, 10:01 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
Sep 24, 8:39 PM EDT	Special Weather Statement	FFC	Chattooga	36 min
Sep 24, 9:01 PM EDT	Special Weather Statement	FFC	Chattooga, Walker	29 min
Sep 24, 9:11 PM EDT	Special Weather Statement	FFC	Dade	34 min
Sep 24, 9:32 PM EDT	Special Weather Statement	FFC	Catoosa, Walker	28 min
Sep 24, 9:34 PM EDT	Special Weather Statement	FFC	Dade	41 min
Sep 24, 10:05 PM EDT	Special Weather Statement	FFC	Carroll	25 min
Sep 24, 10:16 PM EDT	Special Weather Statement	FFC	Bartow	29 min
Sep 24, 10:36 PM EDT	Special Weather Statement	FFC	Bartow, Douglas, Paulding	24 min
Sep 24, 10:45 PM EDT	Special Weather Statement	FFC	Gordon	30 min
Sep 24, 11:07 PM EDT	Special Weather Statement	FFC	Bartow, Douglas, Paulding	23 min
Sep 24, 11:35 PM EDT	Flash Flood Warning	FFC	Gordon, Murray, Walker, Whitfield	3 hr
Sep 24, 11:39 PM EDT	Special Weather Statement	FFC	Bartow, Cherokee	36 min
Sep 25, 12:34 AM EDT	Special Weather Statement	FFC	Paulding	41 min
Sep 25, 1:42 AM EDT	Special Weather Statement	FFC	Cobb	48 min
Sep 25, 10:54 AM EDT	River Flood Warning	FFC	Whitfield	4 days
Sep 25, 5:42 PM EDT	Special Weather Statement	FFC	Stewart	33 min
Sep 25, 5:58 PM EDT	Special Weather Statement	FFC	Chattahoochee	32 min
Sep 25, 6:32 PM EDT	Special Weather Statement	FFC	Muscogee	28 min

Nearby

Special Weather Statements in Georgia, 2018 Every 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.