Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 400, NWS Tallahassee, FL

September 18, 2012Lanier County, Lowndes County, Georgia

NWS Tallahassee, FL issued this severe thunderstorm warning at Sep 18, 2012, 8:53 AM EDT for Lanier County, Lowndes County, Georgia. It was in force for 39 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: Sep 18, 2012, 8:53 AM EDT (12:53 UTC)
Expired: Sep 18, 2012, 9:32 AM EDT
In force: 39 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon

Counties Lanier County, GA, Lowndes County, GA

What was reported inside it

Time	Report	Where	Remark
Sep 18, 8:58 AM EDT	TSTM WND DMG	1 Ne Valdosta, GA	COUNTY DISPATCH REPORTS A COUPLE OF POWER LINES DOWN ON THE NORTHEAST SIDE OF VALDOTA.
Sep 18, 8:58 AM EDT	TSTM WND DMG	4 Se I-75 At Exit 16, GA	TREE DOWN ACROSS LOCH LAUREL ROAD SOUTH OF VALDOSTA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 0.9 hours before the alert went out and 122 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: 2442 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 581 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 101 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 8.2

Open this sounding in Storm Lab

The text

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

040 
WUUS52 KTAE 181253
SVRTAE
GAC173-185-181345-
/O.NEW.KTAE.SV.W.0400.120918T1253Z-120918T1345Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
853 AM EDT TUE SEP 18 2012

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LANIER COUNTY IN SOUTH CENTRAL GEORGIA...
  CENTRAL LOWNDES COUNTY IN SOUTH CENTRAL GEORGIA...

* UNTIL 945 AM EDT

* AT 851 AM EDT...THE NATIONAL WEATHER SERVICE HAS DETECTED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH.  THIS STORM WAS LOCATED NEAR VALDOSTA...AND MOVING EAST AT 35
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MOODY
  AFB

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY. PEOPLE OUTSIDE SHOULD MOVE INSIDE A STRONG BUILDING BUT
AWAY FROM WINDOWS.

&&

LAT...LON 3086 8297 3084 8301 3084 8308 3081 8310
      3080 8312 3077 8313 3077 8333 3084 8336
      3085 8335 3093 8339 3105 8296 3087 8297
TIME...MOT...LOC 1254Z 248DEG 29KT 3084 8326

$$

08-LAMERS

1 follow-up statement

941 
WWUS52 KTAE 181332
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
932 AM EDT TUE SEP 18 2012

GAC173-185-181341-
/O.CAN.KTAE.SV.W.0400.000000T0000Z-120918T1345Z/
LOWNDES GA-LANIER GA-
932 AM EDT TUE SEP 18 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN LANIER AND CENTRAL
LOWNDES COUNTIES IS CANCELLED...

THE LINE OF SEVERE STORMS HAS EXITED TO THE NORTH AND EAST OF THE 
WARNED AREA. A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
NORTHERN AND CENTRAL LANIER COUNTIES UNTIL 945 AM. THE LINE OF 
STORMS PREVIOUSLY DOWNED POWER LINES IN NORTHEASTERN VALDOSTA.

RELAY REPORTS OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE AT 
(8 5 0) 9 4 2 8 8 3 3. OR...CONTACT LAW ENFORCEMENT.

LAT...LON 3086 8297 3084 8301 3084 8308 3081 8310
      3080 8312 3077 8313 3077 8333 3084 8336
      3085 8335 3093 8339 3105 8296 3087 8297
TIME...MOT...LOC 1331Z 248DEG 29KT 3095 8294

$$

08-LAMERS

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 18, 6:13 AM EDT	Special Weather Statement	TAE	Baker, Calhoun, Clay, Decatur, Dougherty, Early and 8 more	62 min
Sep 18, 7:44 AM EDT	Special Weather Statement	TAE	Brooks, Thomas	46 min
Sep 18, 8:24 AM EDT	Special Weather Statement	TAE	Berrien, Brooks, Colquitt, Cook, Lanier, Lowndes	66 min
Sep 18, 9:17 AM EDT	Severe Thunderstorm Warning	TAE	Berrien, Lanier	28 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2012 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.