Alert archive / Georgia / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 248, NWS Jacksonville, FL

August 11, 20118 counties in Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 11, 2011, 6:29 PM EDT for 8 counties in Georgia. It was in force for 33 min. 3 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: Aug 11, 2011, 6:29 PM EDT (22:29 UTC)
Expired: Aug 11, 2011, 7:02 PM EDT
In force: 33 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

Counties Appling County, GA, Atkinson County, GA, Bacon County, GA, Clinch County, GA, Coffee County, GA, Jeff Davis County, GA, Pierce County, GA, Ware County, GA

What was reported inside it

Time	Report	Where	Remark
Aug 11, 6:30 PM EDT	TSTM WND DMG	4 Ese Willacoochee, GA	911 CENTER RELAYED PUBLIC REPORT OF STRUCTURAL DAMAGE TO RESIDENTIAL HOME ALONG WITH DOWNED TREES. TIME ESTIMATED BY DOPPLER RADAR.
Aug 11, 6:45 PM EDT	TSTM WND DMG	6 E Willacoochee, GA	EMERGENCY MANAGER REPORTED STRAIGHT LINE WIND EVENT ON ANTIOCH CHURCH ROAD THAT KNOCKED SEVERAL TREES ONTO A POWER SUBSTATION. THIS EVENT KNOCKED POWER OUT TO A LARGE PORTION OF THE COUNTY AND THE ROAD WAS CLOSED UNTIL 2 AM AUGUST 12TH.
Aug 11, 6:45 PM EDT	TSTM WND DMG	6 Wnw Pearson, GA	EMERGENCY MANAGER REPORTED STRAIGHT LINE WIND EVENT ON SUTTON ROAD THAT TORE THE FRONT PORCH AWNING OFF A MOBILE HOME AND PEELED BACK PART OF THE ROOF. NO INJURIES WERE REPORTED. A LARGE OAK TREE WAS KNOCKED DOWN ON NEARBY WILL LEWIS ROAD AS WELL.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this severe thunderstorm warning; the first came 1 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.5 hours before the alert went out and 149 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: 1588 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 1081 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 51 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.

218 
WUUS52 KJAX 112229
SVRJAX
GAC001-003-005-065-069-161-229-299-112315-
/O.NEW.KJAX.SV.W.0248.110811T2229Z-110811T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
629 PM EDT THU AUG 11 2011

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN WARE COUNTY IN SOUTHEAST GEORGIA
  NORTHWESTERN PIERCE COUNTY IN SOUTHEAST GEORGIA
  SOUTHERN JEFF DAVIS COUNTY IN SOUTHEAST GEORGIA
  SOUTHERN APPLING COUNTY IN SOUTHEAST GEORGIA
  ATKINSON COUNTY IN SOUTHEAST GEORGIA
  BACON COUNTY IN SOUTHEAST GEORGIA
  NORTHWESTERN CLINCH COUNTY IN SOUTHEAST GEORGIA
  SOUTHERN COFFEE COUNTY IN SOUTHEAST GEORGIA

* UNTIL 715 PM EDT

* AT 630 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 9 MILES NORTHWEST
  OF ALMA TO NICHOLLS TO WILLACOOCHEE...OR ALONG A LINE EXTENDING
  FROM 9 MILES NORTHWEST OF ALMA TO 11 MILES SOUTHWEST OF ALMA TO
  WILLACOOCHEE...AND MOVING EAST AT 20 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ALMA...PEARSON...COGDELL AND DIXIE UNION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT.

&&

LAT...LON 3149 8302 3159 8277 3178 8262 3163 8217
      3114 8251 3114 8298 3118 8298 3119 8305
      3127 8304 3131 8307 3133 8307 3135 8310
TIME...MOT...LOC 2230Z 266DEG 17KT 3165 8252 3144 8259
          3132 8298

$$

ENYEDI

2 follow-up statements

432 
WWUS52 KJAX 112245
SVSJAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
645 PM EDT THU AUG 11 2011

GAC001-161-112255-
/O.CAN.KJAX.SV.W.0248.000000T0000Z-110811T2315Z/
JEFF DAVIS GA-APPLING GA-
645 PM EDT THU AUG 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN APPLING AND SOUTHERN
JEFF DAVIS COUNTIES IS CANCELLED...

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT.

LAT...LON 3139 8301 3148 8293 3154 8270 3163 8260
      3161 8247 3154 8238 3145 8229 3114 8251
      3114 8298 3118 8298 3119 8305 3127 8304
      3130 8306
TIME...MOT...LOC 2245Z 266DEG 17KT 3165 8244 3144 8251
          3133 8290

$$

GAC003-005-065-069-229-299-112315-
/O.CON.KJAX.SV.W.0248.000000T0000Z-110811T2315Z/
WARE GA-PIERCE GA-ATKINSON GA-BACON GA-CLINCH GA-COFFEE GA-
645 PM EDT THU AUG 11 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR SOUTHEASTERN COFFEE...NORTHWESTERN CLINCH...BACON...ATKINSON...
WESTERN PIERCE AND NORTHWESTERN WARE COUNTIES...

AT 645 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
TRACK A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER
SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM 8 MILES NORTH OF ALMA TO
BICKLEY TO 6 MILES WEST OF PEARSON...OR ALONG A LINE EXTENDING FROM 8
MILES NORTH OF ALMA TO 8 MILES SOUTHWEST OF ALMA TO 6 MILES WEST OF
PEARSON...MOVING EAST AT 20 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
BICKLEY...PEARSON...AXSON...WARESBORO...MILLWOOD...DIXIE UNION AND
COGDELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT.

&&

LAT...LON 3139 8301 3148 8293 3154 8270 3163 8260
      3161 8247 3154 8238 3145 8229 3114 8251
      3114 8298 3118 8298 3119 8305 3127 8304
      3130 8306
TIME...MOT...LOC 2245Z 266DEG 17KT 3165 8244 3144 8251
          3133 8290

$$

ENYEDI

747 
WWUS52 KJAX 112302
SVSJAX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
702 PM EDT THU AUG 11 2011

GAC003-005-065-069-229-299-112311-
/O.CAN.KJAX.SV.W.0248.000000T0000Z-110811T2315Z/
WARE GA-PIERCE GA-ATKINSON GA-BACON GA-CLINCH GA-COFFEE GA-
702 PM EDT THU AUG 11 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN COFFEE...
NORTHWESTERN CLINCH...BACON...ATKINSON...WESTERN PIERCE AND
NORTHWESTERN WARE COUNTIES IS CANCELLED...

STRONG WINDS TO 50 MPH...SMALL HAIL AND MINOR DAMAGE ARE STILL 
POSSIBLE. A SIGNIFICANT WEATHER ADVISORY IS IN EFFECT. MINOR DAMAGE 
MAY OCCUR. 

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT.

LAT...LON 3139 8301 3148 8293 3154 8270 3163 8260
      3161 8247 3154 8238 3145 8229 3114 8251
      3114 8298 3118 8298 3119 8305 3127 8304
      3130 8306
TIME...MOT...LOC 2301Z 266DEG 17KT 3165 8235 3144 8242
          3134 8281

$$

ENYEDI

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 2:00 PM EDT, 4 hours 29 minutes earlier.

Area forecast discussion, Aug 11, 2:00 PM EDT, 4 hours 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
200 PM EDT THU AUG 11 2011

.SHORT TERM...TNGT THRU SAT NGT...UPPER PATTERN EVOLVES FROM
E-W ORIENTED RIDGE OVER FL/NRN GOM WITH WRLYS N OF AREA...TO A
BUILDING ERN STATES TROUGH/ROCKIES RIDGE PATTERN BY SAT NGT.
SLIGHT DECREASE IN MODEL LLVL TEMPS/THICKNESSES THRU WEEKEND
SUGGEST SLIGHTLY LOWER MAX TEMPS THAN YDAY/TDAY...BUT STILL MID
90S (PSBLY UPR 90S SUWANNEE VALLEY REGION) FRI AND LOW/MID 90S
OVER WEEKEND. SOMEWHAT HIGHER DWPTS WILL KEEP AFTN HEAT INDEX
VALUES IN 100-109 RANGE.

SHOULD SEE RAIN CHANCES INCREASE WITH INCRSG LLVL MOISTURE
AHEAD OF UPR TROF. GOING WITH 30-40 POPS WELL INLAND...20 POP
COAST...NEXT FEW DAYS FOR SCTD AFTN SHRA/TSRA.

.LONG TERM...SUN THRU THURS...MODEL GUID SHOWS UPR TROF INTENSIFY
OVER ERN STATES SUN/MON. WHILE MODELS STALL COLD FRONT OVER NRN FL
MON/TUE...EXPECT DRIER AIR ALOFT AND SUBSIDENCE TO MOVE OVER CWA...
PUSHING PCPN CHANCES TO OUR SRN COUNTIES BY TUE. MOISTURE MAY
RETURN WED/THU TO LEAD TO SCT'D AFTN TSRA WITH SEA BREEZES AND
WEAKENING UPR TROF OVER AREA.

HAVE MAX TEMPS IN MID 90S SUN/MON AND LWR 90S TUE-THU...REMAINING
A LITTLE ABOVE NORMAL.

&&

.AVIATION...PREVAILING VFR EXPECTED THROUGH FRIDAY MORNING. MVFR
VSBY IS PSBL AT GNV AND VQQ MAINLY AFTER 08Z. HOWEVER CONFIDENCE
IS NOT ENOUGH TO INCLUDE ATTM.

&&

.MARINE...NO HEADINES. QUIESCENT CONDS ARE EXPECTED THROUGH THE
WEEKEND DUE TO A WEAK PRESSURE PATTERN. ANOTHER TROUGH APPROACHES
FROM THE NORTH ON MONDAY INCREASING THT SW TO W FLOW.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  74  96  73  93 /  20  30  10  30
SSI  78  91  77  88 /  10  20  10  20
JAX  74  95  74  92 /  10  30  10  30
SGJ  75  92  76  90 /  10  20  20  20
GNV  75  96  75  93 /  10  40  10  40
OCF  75  95  75  93 /  10  50  20  40

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GA...NONE.
AM...NONE.
&&

WOLF/TRABERT/

Hazardous weather outlook, Aug 11, 3:16 AM EDT, 15 hours 13 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
316 AM EDT THU AUG 11 2011

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-121015-
HAMILTON-SUWANNEE-COLUMBIA-BAKER-NASSAU-DUVAL-UNION-BRADFORD-CLAY-
ST JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-COFFEE-
JEFF DAVIS-BACON-APPLING-WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY-
INLAND GLYNN-COASTAL GLYNN-ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN-
COASTAL CAMDEN-
316 AM EDT THU AUG 11 2011

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

...DANGEROUS HEAT INDICES EXPECTED THROUGH THE WEEKEND...

.DAY ONE...TODAY AND TONIGHT...

NEAR RECORD HIGH TEMPERATURES IN THE UPPER 90S TO AROUND 100
DEGREES WILL PUSH HEAT INDICES INTO THE 105 TO 110 RANGE DURING
THE AFTERNOON HOURS. DRINK PLENTY OF FLUIDS...STAY IN AN AIR-
CONDITIONING IF POSSIBLE...REMAIN OUT OF THE SUN...AND TAKE EXTRA
PRECAUTIONS IF YOU WORK OR SPEND TIME OUTSIDE.

ISOLATED THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND
EVENING...AND A FEW MAY CONTAIN STRONG GUSTY WINDS AND FREQUENT
LIGHTNING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

DANGEROUS HEAT INDICES INTO THE 105 TO 110 RANGE WILL BE POSSIBLE
EACH AFTERNOON FROM FRIDAY THROUGH THE WEEKEND.

ISOLATED TO SCATTERED THUNDERSTORM ACTIVITY CAN BE EXPECTED EACH
DAY THROUGH THE PERIOD. ACTIVITY MAY BE STRONG AT TIMES OVER THE
WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT REQUESTED AT THIS TIME.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
IN JACKSONVILLE WEBSITE ON THE INTERNET AT WEATHER.GOV/JAX.

In the hours before

Special weather statement, Aug 11, 5:36 PM EDT, 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
536 PM EDT THU AUG 11 2011

GAZ132>135-150-112215-
APPLING-BACON-COFFEE-JEFF DAVIS-WARE-
536 PM EDT THU AUG 11 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR EXTREME
NORTHWESTERN WARE...JEFF DAVIS...APPLING...BACON AND COFFEE COUNTIES
FOR STRONG WINDS...SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 615
PM EDT...

AT 536 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS CENTERED ALONG A LINE EXTENDING FROM 5 MILES NORTH OF
PLANT HATCH TO SNIPESVILLE TO 14 MILES WEST OF AMBROSE...MOVING EAST
AT 25 MPH. THESE STRONG THUNDERSTORMS WILL ALSO AFFECT AREAS AROUND
SNIPESVILLE...PRIDGEN...HAZLEHURST...PLANT HATCH...DENTON...
AMBROSE...GRAHAM...BROXTON...PINE GROVE AND WEST GREEN THROUGH 615 PM
EDT. HAIL UP TO THREE QUARTER INCH IN DIAMETER...EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE
EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. HEAVY RAINFALL WILL
PRODUCE PONDING OF WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING
AREAS.

REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

LAT...LON 3197 8242 3190 8211 3184 8207 3177 8210
      3177 8213 3172 8213 3160 8220 3143 8245
      3141 8314 3146 8316 3149 8311 3161 8306
      3167 8301 3178 8300 3179 8287 3193 8268
      3193 8262 3197 8255 3195 8250 3198 8249
TIME...MOT...LOC 2136Z 285DEG 23KT 3199 8230 3174 8272
          3153 8320

ENYEDI

Special weather statement, Aug 11, 6:00 PM EDT, 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
600 PM EDT THU AUG 11 2011

GAZ132-149-150-112245-
ATKINSON-COFFEE-WARE-
600 PM EDT THU AUG 11 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR NORTHWESTERN
WARE...ATKINSON AND SOUTHEASTERN COFFEE COUNTIES FOR STRONG WINDS...
SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 645 PM EDT...

AT 600 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 4 MILES NORTHWEST OF WILLACOOCHEE...
MOVING EAST AT 40 MPH. THIS STRONG THUNDERSTORM WILL ALSO AFFECT
AREAS AROUND WILLACOOCHEE...PEARSON...AXSON...BICKLEY AND MILLWOOD
THROUGH 645 PM EDT. HAIL UP TO THREE QUARTER INCH IN DIAMETER...
EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH
CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. IF FURTHER
INTENSIFICATION OCCURS A WARNING MAY BE REQUIRED.

REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

LAT...LON 3141 8314 3141 8244 3114 8265 3118 8267
      3118 8283 3124 8305 3127 8304 3131 8307
      3133 8307 3136 8311 3140 8314
TIME...MOT...LOC 2200Z 289DEG 35KT 3136 8297

ZAPPE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 5:36 PM EDT	Special Weather Statement	JAX	Appling, Bacon, Coffee, Jeff Davis	39 min
Aug 11, 5:43 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Atkinson, Bacon, Coffee, Jeff Davis, Ware and 1 more	47 min
Aug 11, 6:00 PM EDT	Special Weather Statement	JAX	Atkinson	45 min
Aug 11, 6:10 PM EDT	Areal Flood Advisory	JAX	Bacon, Coffee, Jeff Davis	38 min
Aug 11, 6:32 PM EDT	Special Weather Statement	JAX	Appling	43 min
Aug 11, 6:51 PM EDT	Areal Flood Advisory	JAX	Atkinson, Bacon, Coffee, Ware	54 min
Aug 11, 7:01 PM EDT	Special Weather Statement	JAX	Atkinson, Clinch, Pierce, Ware	44 min
Aug 11, 7:13 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Charlton, Clinch, Pierce, Ware	47 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2011 Every severe thunderstorm warning in 2011

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.