Alert archive / Florida / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 317, NWS Jacksonville, FL

November 17, 2011Baker County, Duval County, Nassau County, Florida; Charlton County, Ware County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Nov 17, 2011, 1:31 AM EST for Baker County, Duval County, Nassau County, Florida; Charlton County, Ware County, Georgia. It was in force for 44 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
Nov 17, 2011, 1:31 AM EST (06:31 UTC)
Expired
Nov 17, 2011, 2:15 AM EST
In force
44 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

Counties Baker County, FL, Duval County, FL, Nassau County, FL, Charlton County, GA, Ware County, GA

The radar

The Jacksonville radar (KJAX), 37 km from the middle of the area, began a volume at 06:31 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 6.5 hours before the alert went out and 36 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 00:00Z on 2011-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 769 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, Jacksonville, FL at 00:00Z on 2011-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 square meters per square second.19395878Sfc1 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
769 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
991 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
139 m²/s²
Significant tornado parameter
0.6
Supercell composite
2.4

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 Nov 16, 9:11 PM EST, 4 hours 20 minutes earlier.

Area forecast discussion, Nov 16, 9:11 PM EST, 4 hours 20 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
911 PM EST WED NOV 16 2011

.UPDATE...

A NORTHEAST TO SOUTHWEST ORIENTED LINE OF STORMS JUST AHEAD OF
A SURFACE COLD FRONT IS MOVING EAST ACROSS SOUTHEAST GA AT THE
MOMENT. THE SOUTHERN END OF THIS LINE IS EXPECTED TO WEAKEN OVER
NORTHEAST FLORIDA...LEAVING FOCUS FOR STRONGER STORMS OVER
SOUTHEAST GEORGIA. THE SURFACE COLD FRONT ITSELF WILL CROSS THE
FORECAST AREA EARLY THURSDAY.

&&

.AVIATION...

SHOWERS AND STORMS CAN BE EXPECTED AT AREA TERMINALS
TONIGHT...AHEAD OF AN APPROACHING COLD FRONT. A FEW OF THESE
STORMS COULD PRODUCE A STRONG TO SEVERE STORM. AND AN ISOLATED
TORNADO IS POSSIBLE IN SOUTHEAST GA. RESTRICTIONS CAN BE EXPECTED
THROUGH THE OVERNIGHT PERIOD AT AREA TAF SITES. THE FRONT ITSELF
WILL THEN CROSS AREA TERMINALS EARLY THURSDAY MORNING. WINDS WILL
BE BECOME GUSTY FOLLOWING THE FRONTAL PASSAGE. CONDITIONS WILL
GRADUALLY IMPROVE TO VFR DURING THE AFTERNOON HOURS.

&&

.MARINE...

LINE OF GUSTY STORMS WILL MOVE ACROSS AREA WATERS TONIGHT...AHEAD
OF APPROACHING COLD FRONT. THE FRONT ITSELF WILL CROSS AREA WATERS
LATE THURSDAY MORNING.

RIP CURRENTS: AN ELEVATED RISK OF RIP CURRENTS IS EXPECTED TO
CONTINUE THROUGH THE WEEKEND.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  63  72  39  62 /  90  20   0   0
SSI  66  75  50  62 /  50  40  10  10
JAX  67  77  46  64 /  50  50  10  10
SGJ  68  78  55  67 /  40  50  10  20
GNV  66  78  46  68 /  50  50   0  10
OCF  66  80  47  71 /  50  50  10  10

&&

.JAX WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
GA...NONE.
AM...SMALL CRAFT ADVISORY FROM 3 PM THURSDAY TO 6 AM EST SATURDAY FOR
     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.

     SMALL CRAFT ADVISORY FROM 7 PM THURSDAY TO 1 AM EST SATURDAY FOR
     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.

&&

STRUBLE/SANDRIK
Hazardous weather outlook, Nov 17, 1:10 AM EST, 21 minutes before
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In the hours before

Special weather statement, Nov 16, 10:11 PM EST, 3 hours 20 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1011 PM EST WED NOV 16 2011

GAZ149-150-163-170400-
ATKINSON-CLINCH-WARE-
1011 PM EST WED NOV 16 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR ATKINSON...
CLINCH AND WARE COUNTIES FOR STRONG WINDS AND FREQUENT LIGHTNING
VALID UNTIL 1100 PM EDT...

A LINE OF STRONG THUNDERSTORMS WILL MOVE ACROSS CLINCH COUNTY AND
INTO ATKINSON AND WARE COUNTIES THROUGH 1100 PM THIS EVENING. BRIEF
DOWNPOURS...GUSTY WINDS OF 45 TO 55 MPH AND FREQUENT CLOUD TO GROUND
LIGHTNING CAN BE EXPECTED AS THE LINE MOVES EAST ACROSS THESE
COUNTIES.

TORNADO WATCH 892 IS IN EFFECT ACROSS SOUTHEAST GEORGIA UNTIL 200 AM.
REMEMBER TORNADOES ARE POSSIBLE IN AND NEAR THE WATCH AREA.

PRESNALL
Special weather statement, Nov 16, 11:59 PM EST, 1 hour 32 minutes before
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Special weather statement, Nov 17, 12:07 AM EST, 1 hour 24 minutes before
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Special weather statement, Nov 17, 12:29 AM EST, 1 hour 2 minutes before
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Special weather statement, Nov 17, 12:52 AM EST, 39 minutes before
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Special weather statement, Nov 17, 1:14 AM EST, 17 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Nov 17, 12:07 AM ESTSpecial Weather StatementJAXColumbia, Hamilton, Suwannee38 min
Nov 17, 12:31 AM ESTSevere Thunderstorm WarningJAXBaker, Columbia, Hamilton, Suwannee29 min
Nov 17, 1:00 AM ESTSevere Thunderstorm WarningJAXBaker, Columbia, Nassau30 min
Nov 17, 1:14 AM ESTSpecial Weather StatementJAXBaker, Union31 min
Nov 17, 2:30 AM ESTSpecial Weather StatementJAXGilchrist, Union60 min
Nov 17, 3:14 AM ESTSpecial Weather StatementJAXBradford, Duval46 min
Nov 17, 4:46 AM ESTSpecial Weather StatementJAXClay44 min
Nov 17, 4:52 AM ESTSpecial Weather StatementJAXPutnam53 min
Nov 17, 5:24 AM ESTSpecial Weather StatementJAXSaint Johns66 min
Nov 17, 5:28 AM ESTSpecial Weather StatementJAXFlagler, Marion, Putnam62 min
Nov 17, 6:21 AM ESTSpecial Marine WarningJAX39 min
Nov 17, 6:31 AM ESTSpecial Weather StatementJAXFlagler, Marion, Putnam59 min
Nov 17, 7:29 AM ESTSpecial Weather StatementJAXMarion46 min
Nov 17, 7:31 AM ESTSpecial Weather StatementJAXFlagler29 min
Nov 17, 8:02 AM ESTSpecial Weather StatementJAXFlagler43 min
Nov 16, 7:32 PM ESTSevere Thunderstorm WarningJAXAppling, Bacon, Coffee, Jeff Davis43 min
Nov 16, 7:55 PM ESTSevere Thunderstorm WarningJAXAtkinson, Clinch39 min
Nov 16, 8:30 PM ESTSevere Thunderstorm WarningJAXAtkinson, Bacon, Clinch, Pierce, Ware45 min
Nov 16, 8:53 PM ESTTornado WarningJAXBrantley, Pierce, Wayne37 min
Nov 16, 9:03 PM ESTSevere Thunderstorm WarningJAXClinch42 min
Nov 16, 10:58 PM ESTSevere Thunderstorm WarningJAXBrantley, Pierce, Ware, Wayne47 min
Nov 16, 11:51 PM ESTSevere Thunderstorm WarningJAXBrantley, Glynn, Pierce, Wayne39 min
Nov 16, 11:59 PM ESTSpecial Weather StatementJAXEchols46 min
Nov 17, 12:29 AM ESTSpecial Weather StatementJAXGlynn31 min
Nov 17, 12:52 AM ESTSpecial Weather StatementJAXCamden53 min
Nov 17, 10:23 AM ESTLake Wind AdvisoryJAXAppling, Atkinson, Bacon, Coffee, Jeff Davis, Pierce and 1 more6 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2011Severe Thunderstorm Warnings in Georgia, 2011Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.