Alert archive / Georgia / Lake Wind Advisories in 2012

Lake Wind Advisory 50, NWS Jacksonville, FL

December 25, 20127 counties in Florida; 12 counties in Georgia

NWS Jacksonville, FL issued this lake wind advisory at Dec 25, 2012, 1:40 PM EST for 7 counties in Florida; 12 counties in Georgia. It took effect at Dec 26, 2012, 4:05 AM EST. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued
Dec 25, 2012, 1:40 PM EST (18:40 UTC)
In effect from
Dec 26, 2012, 4:05 AM EST
Expired
Dec 26, 2012, 10:00 PM EST
In force
18 hr
Issued by
NWS Jacksonville, FL

Counties Baker County, FL, Bradford County, FL, Flagler County, FL, Gilchrist County, FL, Nassau County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Glynn County, GA, Jeff Davis County, GA, Pierce County, GA, Wayne County, GA

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 6.7 hours before the alert went out and 198 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 2012-12-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 212 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 2012-12-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 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
212 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
448 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
64 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this lake wind advisory 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 lake wind advisory went out at Dec 25, 9:57 AM EST, 3 hours 43 minutes earlier.

Area forecast discussion, Dec 25, 9:57 AM EST, 3 hours 43 minutes before
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Hazardous weather outlook, Dec 25, 1:35 PM EST, 5 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
135 PM EST TUE DEC 25 2012

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-261515-
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-
135 PM EST TUE DEC 25 2012

...SLIGHT RISK FOR SEVERE THUNDERSTORMS ON WEDNESDAY...
...WINDY CONDITIONS EXPECTED WEDNESDAY...

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

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

A LINE OF STRONG TO POSSIBLY SEVERE STORMS WILL APPROACH FROM THE
WEST LATE TONIGHT...AND MAY REACH FAR WESTERN PORTIONS OF SOUTH-
CENTRAL GEORGIA AND NORTHERN FLORIDA TOWARD DAWN. THE MAIN THREATS
FROM THE LINE WILL BE DAMAGING WINDS AND ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

A STORM SYSTEM WILL PASS NORTH OF THE AREA ON WEDNESDAY. THE
ASSOCIATED COLD FRONT WILL CROSS THE REGION WEDNESDAY MORNING. A
LINE OF SHOWERS AND THUNDERSTORMS IS EXPECTED ALONG AND AHEAD OF
THE FRONT. THERE IS POTENTIAL FOR STRONG...EVEN DAMAGING...WINDS
WITH THESE STORMS.  ISOLATED TORNADOES ARE ALSO POSSIBLE.  THE
THREAT FOR SEVERE WEATHER SHOULD BE GREATEST DURING THE MORNING...
DIMINISHING FROM WEST TO EAST DURING THE LATE MORNING AND EARLY
AFTERNOON HOURS.

WINDY CONDITIONS ARE EXPECTED DURING THE DAY AS THE STORM SYSTEM
PASSES NORTH OF THE AREA.  A LAKE WIND ADVISORY IS IN EFFECT FOR
WEDNESDAY. WINDS WILL BE 20 TO 25 MPH WITH OCCASIONAL GUSTS UP TO
35 MPH.

HAZARDOUS MARINE CONDITIONS ARE EXPECTED WEDNESDAY INTO WEDNESDAY
NIGHT DUE TO HIGHER WINDS AND SEAS ASSOCIATED WITH THE STORM
SYSTEM.  A GALE WARNING IS IN EFFECT FOR OFFSHORE WATERS FOR
WEDNESDAY AND WEDNESDAY NIGHT...WHILE A SMALL CRAFT ADVISORY IS IN
EFFECT FOR NEARSHORE WATERS.

SOME PATCHY FROST IS POSSIBLE TOWARD DAWN THURSDAY IN THE NORMALLY
COLDER LOCATIONS WHERE TEMPERATURES WILL DROP INTO THE MID 30S AND
WINDS CAN BE LIGHT ENOUGH FOR FROST TO FORM.  FROST WILL BE MORE
WIDESPREAD EARLY FRIDAY WHERE WINDS WILL LIGHT EVERYWHERE...WITH
PRE-DAWN TEMPERATURES IN THE LOWER TO MID 30S.

.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.

PW

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 25, 4:01 AM ESTGale WatchJAX10 hr
Dec 25, 4:01 AM ESTSmall Craft AdvisoryJAX46 hr
Dec 25, 2:28 PM ESTGale WarningJAX36 hr
Dec 25, 5:09 AM ESTDense Fog AdvisoryJAXAppling, Atkinson, Bacon, Brantley, Clinch, Coffee and 4 more5 hr

Nearby

Lake Wind Advisories in Georgia, 2012Lake Wind Advisories in Florida, 2012Every lake wind advisory 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.