Alert archive / Georgia / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 226, NWS Jacksonville, FL

December 17, 20125 counties in Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Dec 17, 2012, 2:25 PM EST for 5 counties in Georgia. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 17, 2012, 2:25 PM EST (19:25 UTC)
Expired
Dec 17, 2012, 3:03 PM EST
In force
38 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

Counties Appling County, GA, Bacon County, GA, Coffee County, GA, Jeff Davis County, GA, Wayne County, GA

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Dec 17, 1:30 PM ESTTornado WatchSPC5 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 7.4 hours before the alert went out and 145 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, Jacksonville, FL at 12:00Z on 2012-12-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Jacksonville, FL at 12:00Z on 2012-12-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
620 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Dec 17, 10:10 AM EST, 4 hours 15 minutes earlier.

Area forecast discussion, Dec 17, 10:10 AM EST, 4 hours 15 minutes before
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Hazardous weather outlook, Dec 17, 2:00 PM EST, 25 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
200 PM EST MON DEC 17 2012

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-181900-
ALTAMAHA SOUND GA TO FERNANDINA BEACH FL OUT 20 NM-
FERNANDINA BEACH TO ST AUGUSTINE FL OUT 20 NM-
ST AUGUSTINE TO FLAGLER BEACH FL OUT 20 NM-
ALTAMAHA SOUND GA TO FERNANDINA BEACH FL 20 NM TO 60 NM OFFSHORE-
FERNANDINA BEACH TO ST AUGUSTINE FL 20 NM TO 60 NM OFFSHORE-
ST AUGUSTINE TO FLAGLER BEACH FL 20 NM TO 60 NM OFFSHORE-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-
200 PM EST MON DEC 17 2012

...SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS SOUTHEAST GEORGIA AND
EXTREME NORTHEAST FLORIDA THIS AFTERNOON AND EVENING...

...ISOLATED STRONG STORMS POSSIBLE ACROSS THE REMAINDER OF THE AREA
THIS AFTERNOON AND EVENING...

...SMALL CRAFT ADVISORY FOR WINDS ACROSS THE OUTER WATERS LATE
TONIGHT AND TUESDAY...

...TORNADO WATCH IN EFFECT THIS AFTERNOON FOR SOUTHEAST GEORGIA
AND PORTIONS OF NORTHEAST FLORIDA...

THIS OUTLOOK IS FOR NORTHEAST FLORIDA...SOUTHEAST GEORGIA AND THE
ADJACENT COASTAL WATERS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

A TORNADO WATCH IS IN EFFECT FOR ALL OF SOUTHEAST GEORGIA AND THE
SUWANNEE VALLEY REGION OF NORTHEAST FLORIDA. A LINE OF SHOWERS AND
THUNDERSTORMS WILL ACCOMPANY A COLD FRONT THROUGH SOUTHEAST
GEORGIA AND PORTIONS OF NORTHEAST FLORIDA THIS AFTERNOON. THERE IS
A SLIGHT RISK OF SEVERE STORMS EXTENDING FROM ALL OF SOUTHEAST
GEORGIA TO NEAR I-10 IN NORTHEAST FLORIDA FOR THIS AFTERNOON AND
EVENING. THE MAIN SEVERE THREAT WILL BE DAMAGING WINDS...HOWEVER
ISOLATED TORNADOES ARE ALSO POSSIBLE.

ISOLATED STRONG STORMS WILL BE POSSIBLE ACROSS THE REMAINDER OF
THE AREA.

IN THE WAKE OF THE FRONT LATE TONIGHT...SMALL CRAFT ADVISORY WIND
CONDITIONS WILL PREVAIL ACROSS THE OUTER COASTAL WATERS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

SMALL CRAFT ADVISORY WIND CONDITIONS WILL CONTINUE ACROSS THE OUTER
COASTAL WATERS TUESDAY MORNING.

SMALL CRAFT ADVISORY CRITERIA MAY BE POSSIBLE ONCE AGAIN THURSDAY
NIGHT AND FRIDAY ASSOCIATED WITH ANOTHER FRONTAL PASSAGE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS REQUESTED THIS AFTERNOON.

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

JDS

In the hours before

Special weather statement, Dec 17, 2:01 PM EST, 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
201 PM EST MON DEC 17 2012

GAZ132-133-172000-
COFFEE-JEFF DAVIS-
201 PM EST MON DEC 17 2012

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR JEFF DAVIS AND
COFFEE COUNTIES FOR STRONG WINDS VALID UNTIL 300 PM EST...

AT 200 PM EST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS CENTERED ALONG A LINE EXTENDING FROM 14 MILES NORTHWEST
OF HAZLEHURST TO 22 MILES SOUTHWEST OF AMBROSE...MOVING EAST AT 45
MPH. THESE STRONG THUNDERSTORMS WILL ALSO AFFECT AREAS AROUND
PRIDGEN...AMBROSE...SNIPESVILLE...BROXTON...HAZLEHURST...DENTON...
WEST GREEN AND DOUGLAS THROUGH 300 PM EST. GUSTY WINDS OF 45 TO 55
MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR WIND DAMAGE.

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

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM EST MONDAY EVENING FOR
NORTHEASTERN FLORIDA AND SOUTHEAST GEORGIA. TORNADOES CAN DEVELOP
QUICKLY WITH LITTLE OR NO ADVANCED WARNING.

LAT...LON 3197 8243 3174 8261 3142 8272 3142 8314
      3147 8316 3149 8311 3157 8306 3161 8306
      3167 8300 3179 8299 3179 8287 3193 8268
      3192 8264 3197 8254 3195 8250 3198 8249
TIME...MOT...LOC 1900Z 262DEG 40KT 3200 8275 3144 8330

WOLF

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 17, 3:45 AM ESTSmall Craft Advisory for WindsJAX36 hr
Dec 17, 3:54 PM ESTSpecial Weather StatementJAXHamilton51 min
Dec 17, 4:18 PM ESTSpecial Marine WarningJAX87 min
Dec 17, 4:40 PM ESTSpecial Weather StatementJAXHamilton50 min
Dec 17, 5:06 PM ESTSpecial Weather StatementJAXBradford, Union39 min
Dec 17, 5:26 PM ESTSpecial Weather StatementJAXAlachua, Baker, Bradford, Clay, Columbia, Duval and 4 more49 min
Dec 17, 5:28 PM ESTSpecial Marine WarningJAX70 min
Dec 17, 6:10 PM ESTSpecial Weather StatementJAXAlachua, Baker, Bradford, Clay, Columbia, Duval and 3 more50 min
Dec 17, 6:14 PM ESTSpecial Marine WarningJAX110 min
Dec 17, 6:59 PM ESTSpecial Weather StatementJAXAlachua, Bradford, Clay, Duval, Gilchrist, Union46 min
Dec 17, 2:01 PM ESTSpecial Weather StatementJAXCoffee, Jeff Davis59 min
Dec 17, 2:33 PM ESTSpecial Weather StatementJAXAtkinson, Bacon, Coffee, Pierce42 min
Dec 17, 3:05 PM ESTSpecial Weather StatementJAXAppling40 min
Dec 17, 3:10 PM ESTSevere Thunderstorm WarningJAXAppling, Wayne28 min
Dec 17, 3:12 PM ESTSpecial Weather StatementJAXClinch, Pierce, Ware48 min
Dec 17, 3:41 PM ESTSpecial Weather StatementJAXGlynn, Wayne49 min
Dec 17, 4:28 PM ESTSpecial Weather StatementJAXCamden, Glynn47 min

Nearby

Severe 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; the sounding from the Mesonet's radiosonde archive.