Alert archive / Florida / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 407, NWS Tallahassee, FL

December 17, 2012Decatur County, Grady County, Seminole County, Georgia; 4 counties in Florida

NWS Tallahassee, FL issued this severe thunderstorm warning at Dec 17, 2012, 1:19 PM EST for Decatur County, Grady County, Seminole County, Georgia; 4 counties in Florida. It was in force for 41 min. 4 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
Dec 17, 2012, 1:19 PM EST (18:19 UTC)
Expired
Dec 17, 2012, 2:00 PM EST
In force
41 min
Issued by
NWS Tallahassee, FL
Area
Storm-based polygon

Counties Calhoun County, FL, Gadsden County, FL, Jackson County, FL, Liberty County, FL, Decatur County, GA, Grady County, GA, Seminole County, GA

The radar

The Tallahassee radar (KTLH), 59 km from the middle of the area, began a volume at 18:22 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.

What was reported inside it

TimeReportWhereRemark
Dec 17, 1:20 PM ESTTSTM WND DMG1 N Grand Ridge, FLSEVERAL TREES DOWN ACROSS JACKSON COUNTY.
Dec 17, 1:30 PM ESTTSTM WND DMGBlountstown, FLTREE DOWN ON GREENHOUSE RD.
Dec 17, 1:45 PM ESTTSTM WND DMG1 Wnw Faceville Landing, GATREES DOWN ON HWY 97 SOUTH
Dec 17, 2:10 PM ESTTSTM WND DMGQuincy, FLA FEW TREES DOWN IN QUINCY.

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, 6.3 hours before the alert went out and 62 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, Tallahassee Rgnl, FL at 12:00Z on 2012-12-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 joules per kilogram.LCLLFCEL10008507005003002001001 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, Tallahassee Rgnl, FL at 12:00Z on 2012-12-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 186 square meters per square second.1939587897117Sfc1 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
4 J/kg
Mixed-layer CIN
-279 J/kg
Mixed-layer LCL
587 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
186 m²/s²
0-3 km storm-relative helicity
390 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

284 
WUUS52 KTAE 171819
SVRTAE
FLC013-039-063-077-GAC087-131-253-171900-
/O.NEW.KTAE.SV.W.0407.121217T1819Z-121217T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
119 PM EST MON DEC 17 2012

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GADSDEN COUNTY IN FLORIDA...
  NORTHERN LIBERTY COUNTY IN FLORIDA...
  CALHOUN COUNTY IN THE PANHANDLE OF FLORIDA...
  SOUTHEASTERN JACKSON COUNTY IN THE PANHANDLE OF FLORIDA...
  DECATUR COUNTY IN SOUTHWEST GEORGIA...
  WESTERN GRADY COUNTY IN SOUTHWEST GEORGIA...
  SOUTHERN SEMINOLE COUNTY IN SOUTHWEST GEORGIA...

* UNTIL 200 PM EST/100 PM CST/

* AT 115 PM EST/1215 PM CST/...LOCAL LAW ENFORCEMENT REPORTED A LINE
  OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM 13 MILES NORTH OF CHATTAHOOCHEE TO 24 MILES WEST OF           
  BLOUNTSTOWN...MOVING EAST AT 40 MPH.

  SEVERAL TREES AND POWER LINES HAVE BEEN DOWNED IN WASHINGTON AND
  JACKSON COUNTIES.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEST
  BAINBRIDGE...BAINBRIDGE...WHIGHAM AND QUINCY

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 3056 8538 3096 8485 3098 8426 3070 8429
      3046 8464 3026 8503 3033 8539
TIME...MOT...LOC 1818Z 275DEG 34KT 3089 8478 3037 8541

$$

08-LAMERS
1 follow-up statement
262 
WWUS52 KTAE 171844
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
144 PM EST MON DEC 17 2012

GAC253-171853-
/O.CAN.KTAE.SV.W.0407.000000T0000Z-121217T1900Z/
SEMINOLE GA-
144 PM EST MON DEC 17 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN SEMINOLE COUNTY IS
CANCELLED...

THE LINE OF THUNDERSTORMS THAT PROMPTED THE WARNING HAS EXITED 
SEMINOLE COUNTY.

LAT...LON 3043 8538 3073 8496 3078 8492 3072 8487
      3076 8486 3080 8479 3089 8476 3097 8475
      3098 8426 3070 8429 3046 8464 3026 8503
      3033 8539
TIME...MOT...LOC 1843Z 275DEG 34KT 3095 8437 3032 8523

$$

FLC013-039-063-077-GAC087-131-171900-
/O.CON.KTAE.SV.W.0407.000000T0000Z-121217T1900Z/
GRADY GA-CALHOUN FL-JACKSON FL-DECATUR GA-LIBERTY FL-GADSDEN FL-
144 PM EST MON DEC 17 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM
EST/100 PM CST/ FOR GADSDEN AND NORTHERN LIBERTY COUNTIES IN
FLORIDA...AND SOUTHEASTERN JACKSON AND CALHOUN COUNTIES IN THE
PANHANDLE OF FLORIDA...AND DECATUR AND WESTERN GRADY COUNTIES IN
SOUTHWEST GEORGIA...

AT 138 PM EST/1238 PM CST/...NATIONAL WEATHER SERVICE DOPPLER RADAR
CONTINUED TO INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF
PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM CLIMAX TO FRINK...MOVING EAST AT
40 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO QUINCY 
AND HAVANA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EST MONDAY EVENING/800
PM CST MONDAY EVENING/ FOR CENTRAL FLORIDA AND SOUTHWESTERN GEORGIA.

&&

LAT...LON 3043 8538 3073 8496 3078 8492 3072 8487
      3076 8486 3080 8479 3089 8476 3097 8475
      3098 8426 3070 8429 3046 8464 3026 8503
      3033 8539
TIME...MOT...LOC 1843Z 275DEG 34KT 3095 8437 3032 8523

$$

08-LAMERS

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 17, 12:53 PM ESTSevere Thunderstorm WarningTAESeminole37 min
Dec 17, 1:47 PM ESTSpecial Weather StatementTAEBen Hill, Berrien, Colquitt, Cook, Irwin, Tift43 min
Dec 17, 1:57 PM ESTSevere Thunderstorm WarningTAEDecatur, Grady, Thomas48 min
Dec 17, 2:24 PM ESTSevere Thunderstorm WarningTAEBerrien, Brooks, Cook, Lanier, Lowndes66 min
Dec 17, 3:28 PM ESTSpecial Weather StatementTAELowndes47 min
Dec 17, 3:55 PM ESTSevere Thunderstorm WarningTAELowndes50 min
Dec 17, 5:15 AM ESTRip Current StatementTAEBay, Gulf, Walton22 hr
Dec 17, 12:20 PM ESTSpecial Marine WarningTAE55 min
Dec 17, 12:39 PM ESTSpecial Weather StatementTAEJackson, Washington66 min
Dec 17, 1:56 PM ESTSevere Thunderstorm WarningTAECalhoun, Gadsden, Leon, Liberty, Wakulla64 min
Dec 17, 2:26 PM ESTSpecial Weather StatementTAEJefferson, Leon64 min
Dec 17, 3:21 PM ESTSpecial Weather StatementTAEMadison54 min

Nearby

Severe Thunderstorm Warnings in Florida, 2012Severe Thunderstorm Warnings in Georgia, 2012Every 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; radar from the NEXRAD Level II archive.