Alert archive / Florida / Special Weather Statements in 2012

Special Weather Statement, NWS Jacksonville, FL

July 17, 2012Union County, Florida

NWS Jacksonville, FL issued this special weather statement at Jul 17, 2012, 5:36 PM EDT for Union County, Florida. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 17, 2012, 5:36 PM EDT (21:36 UTC)
Expired
Jul 17, 2012, 6:15 PM EDT
In force
39 min
Issued by
NWS Jacksonville, FL

County Union County, FL

The radar

The Jacksonville radar (KJAX), 83 km from the middle of the area, began a volume at 21:40 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 12:00Z, 9.6 hours before the alert went out and 84 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 2012-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1223 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 12:00Z on 2012-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.1939Sfc1 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
1223 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
836 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
2 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.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 17, 2:40 PM EDT, 2 hours 56 minutes earlier.

Area forecast discussion, Jul 17, 2:40 PM EDT, 2 hours 56 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
240 PM EDT TUE JUL 17 2012

.SHORT TERM /TONIGHT THROUGH WEDNESDAY/...
SCATTERED TO NUMEROUS THUNDERSTORMS CONTINUE ACROSS INLAND LOCATIONS
WITH LESS COVERAGE CLOSER TO THE COAST...AS UPPER LEVEL LOW
PRESSURE INTERACTS WITH SEABREEZE/OUTFLOW BOUNDARIES. COVERAGE WILL
INCREASE LATE THIS AFTERNOON...AND WILL USE NUMEROUS POPS
INLAND...WITH SCATTERED ALONG THE COAST. SEVERE THUNDERSTORM WATCH
488 CONTINUES FOR INLAND SE GA/NE FL UNTIL 8 PM. OUTSIDE THE
WATCH...A FEW STRONG STORMS WILL BE POSSIBLE THROUGH EARLY THIS
EVENING...WITH WINDS/HAIL THE MAIN CONCERNS. ACTIVITY WILL DIMINISH
THIS EVENING...WITH MOST INLAND AREAS DRY BY MIDNIGHT...WITH A FEW
COASTAL SHOWERS POSSIBLE OVERNIGHT/EARLY WEDNESDAY.

FOR WEDNESDAY...THE UPPER LOW WILL NUDGE WESTWARD ACROSS INLAND
NORTHERN FL. WITH A SURFACE HIGH PRESSURE RIDGE TO THE SOUTH...THIS
WILL ALLOW FOR A SW FLOW...AND THE WEST COAST SEABREEZE COLLIDING
WITH THE ATLANTIC SEABREEZE WHICH WILL BE PINNED NEAR THE EAST
COAST. WILL USE HIGH END SCATTERED POPS WEDNESDAY AFTN/EVENING.
SLIGHTLY ABOVE NORMAL HIGH TEMPERATURES CAN BE EXPECTED UNDER
SW FLOW.

THURSDAY AND FRIDAY...
UPPER LOW WILL MOVE NORTH AWAY FROM THE AREA WEDNESDAY NIGHT AND
THEN BECOME ABSORBED INTO AN AMPLIFYING EASTERN UNITED STATES
TROUGH ON THURSDAY. AT THE SAME TIME...HIGH PRESSURE RIDGE WILL
BUILD ACROSS THE FLORIDA PENINSULA...MAINTAINING A DEEP MOIST
SOUTHWESTERLY FLOW ACROSS THE REGION. SCATTERED TO NUMEROUS
THUNDERSTORMS ARE EXPECTED ALONG AND NORTH OF I-10...WITH POPS
TAPERING OFF AS YOU GO SOUTH TOWARD THE HIGH PRESSURE RIDGE AXIS.
TEMPERATURES WILL WARM INTO THE MID 90S ACROSS MUCH OF NORTHEAST
FLORIDA WITH SLIGHTLY LOWER TEMPS ACROSS GEORGIA DUE TO INCREASED
CLOUDS AND PRECIP NEAR THE UPPER TROUGH AXIS.

DRIER AIR WILL BEGIN TO PUSH NORTH INTO NORTHERN FLORIDA ON FRIDAY
WHICH WILL KEEP THUNDERSTORM ACTIVITY MORE ISOLATED TO WIDELY
SCATTERED SOUTH OF I-10. BETTER CHANCES OF PRECIP WILL EXIST
ACROSS SOUTHEAST GEORGIA WHERE DEEPER MOISTURE (PWATS IN EXCESS OF
2 INCHES) WILL CONTINUE TO RESIDE. LESS CLOUD COVER AND PRECIP
ALONG WITH BUILDING HEIGHTS WILL RESULT IN HOT CONDITIONS ACROSS
NORTHEAST FLORIDA WITH HIGHS SOLIDLY IN THE MID 90S...ESPECIALLY
ALONG THE I-95 CORRIDOR AS DEEP SOUTHWEST FLOW PUSHES THE HEAT
TOWARD THE ATLANTIC COAST.

&&

.LONG TERM...SATURDAY THROUGH TUESDAY

DRIER AIR WILL CONTINUE TO WORK NORTH AROUND THE RIDGE THIS
WEEKEND. MODELS ARE NOW COMING IN FARTHER NORTH WITH THE DRY
AIR...WHICH WOULD RESULT IN A DRIER FORECAST ACROSS SOUTHEAST
GEORGIA THAN PREVIOUSLY EXPECTED. WILL NOT MAKE ANY CHANGES IN
THIS DIRECTION JUST YET...BUT IF THIS TREND CONTINUES...WE WILL
NEED TO LOWER POPS ACROSS SOUTHEAST GEORGIA. IN ANY EVENT...HOT
AND DRY CONDITIONS CONTINUE TO LOOK LIKELY ACROSS MUCH OF
NORTHEAST FLORIDA THIS WEEKEND.

&&

.AVIATION...

THUNDERSTORM ACTIVITY SHOULD INCREASE ACROSS NORTHEAST FLORIDA AS
THE AFTERNOON PROGRESSES. MVFR/IFR CONDITIONS WILL ACCOMPANY
THUNDERSTORM ACTIVITY...WITH THE POTENTIAL FOR STRONG GUSTY WINDS
WITH THE STRONGEST STORMS. GNV...VQQ...AND JAX HAVE THE HIGHEST
CHANCES OF SEEING THUNDERSTORMS AND TEMPO GROUPS FOR TSRA HAVE
BEEN INCLUDED AT THESE TERMINALS. THUNDERSTORMS WILL WIND DOWN
EARLY THIS EVENING AND VFR CONDITIONS ARE THEN EXPECTED TO PREVAIL
THE REST OF THIS TAF PERIOD.

&&

.MARINE...
WINDS AND SEAS WILL REMAIN UNDER SCEC UNDER GENERAL S/SW FLOW.
BRIEF PERIODS OF 15 KT WINDS WILL BE POSSIBLE...ESPECIALLY
AT NIGHT. SEAS MAINLY 4 FT OR LESS...WITH AN ELY SWELL 2-3 FT
PERSISTING OVER THE FEW DAYS.

.RIP CURRENT RISK...MODERATE RISK THROUGH WEDNESDAY DUE TO LINGERING
EASTERLY SWELL.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  72  95  73  94 /  40  50  40  50
SSI  76  90  77  90 /  20  70  70  60
JAX  71  94  74  94 /  30  60  60  60
SGJ  73  91  75  92 /  20  60  60  60
GNV  71  93  73  94 /  50  50  40  60
OCF  70  94  73  93 /  50  50  40  60

&&

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

SHULER/ALLEN/
Hazardous weather outlook, Jul 17, 12:55 PM EDT, 4 hours 41 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1255 PM EDT TUE JUL 17 2012

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-
GAZ132>136-149>154-162>166-180830-
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-
1255 PM EDT TUE JUL 17 2012

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

...STRONG TO LOCALLY SEVERE THUNDERSTORMS THIS AFTERNOON INTO
EARLY EVENING...

...LOCALLY HEAVY RAINFALL POSSIBLE THIS AFTERNOON...

...MODERATE RISK OF RIP CURRENTS TODAY...

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

AN UPPER LOW OVER NORTHEAST FLORIDA WILL HELP PRODUCE SCATTERED TO
NUMEROUS THUNDERSTORMS THIS AFTERNOON AND EARLY EVENING. SLOW
MOVING STORMS WILL PRODUCE LOCALLY HEAVY RAINFALL. STRONG TO
LOCALLY SEVERE THUNDERSTORMS WILL OCCUR OVER INLAND AREAS...WITH
STRONG WINDS AND HAIL THE MAIN THREATS. A SEVERE THUNDERSTORM
WATCH IS IN EFFECT UNTIL 8 PM FOR PORTIONS OF INTERIOR SOUTHEAST
GEORGIA AND NORTHEAST FLORIDA.

THERE WILL BE A MODERATE RISK OF RIP CURRENTS TODAY DUE TO LONG
PERIOD EASTERLY SWELLS.

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

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED WEDNESDAY AND
THURSDAY...BECOMING NUMEROUS NEAR THE EAST COAST AS THE SEABREEZE
FRONTS COLLIDE LATE IN THE DAY. A FEW STORMS MAY BE STRONG AND
PRODUCE STRONG GUSTY WINDS AND FREQUENT LIGHTNING STRIKES.
THUNDERSTORMS WILL BECOME MORE SCATTERED FRIDAY THROUGH MONDAY.

A MODERATE RISK OF RIP CURRENTS WILL CONTINUE ON WEDNESDAY DUE TO
LINGERING EASTERLY SWELLS.

.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

Local storm report, Jul 17, 4:30 PM EDT, 1 hour 6 minutes before
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Special weather statement, Jul 17, 4:35 PM EDT, 1 hour 1 minute before
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Special weather statement, Jul 17, 4:51 PM EDT, 45 minutes before
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Special weather statement, Jul 17, 4:55 PM EDT, 41 minutes before
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Special weather statement, Jul 17, 5:30 PM EDT, 6 minutes before
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Special weather statement, Jul 17, 5:36 PM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 8:07 PM EDTSpecial Weather StatementJAXAlachua38 min
Jul 16, 8:42 PM EDTSpecial Weather StatementJAXAlachua33 min
Jul 17, 1:19 PM EDTSpecial Weather StatementJAXMarion41 min
Jul 17, 2:01 PM EDTSpecial Weather StatementJAXMarion59 min
Jul 17, 2:49 PM EDTSpecial Weather StatementJAXFlagler41 min
Jul 17, 3:27 PM EDTSpecial Weather StatementJAXHamilton33 min
Jul 17, 3:41 PM EDTSpecial Weather StatementJAXSuwannee34 min
Jul 17, 3:44 PM EDTSevere Thunderstorm WarningJAXSuwannee46 min
Jul 17, 3:53 PM EDTSpecial Weather StatementJAXClay37 min
Jul 17, 4:29 PM EDTSpecial Weather StatementJAXSuwannee46 min
Jul 17, 4:35 PM EDTSpecial Weather StatementJAXBradford, Clay40 min
Jul 17, 5:30 PM EDTSpecial Weather StatementJAXBaker45 min
Jul 17, 6:04 PM EDTSpecial Weather StatementJAXUnion26 min
Jul 17, 6:24 PM EDTSpecial Weather StatementJAXAlachua36 min
Jul 17, 6:29 PM EDTAreal Flood AdvisoryJAXAlachua46 min
Jul 17, 12:56 PM EDTSpecial Weather StatementJAXJeff Davis49 min
Jul 17, 1:10 PM EDTSpecial Weather StatementJAXAppling50 min
Jul 17, 1:25 PM EDTSevere Thunderstorm WarningJAXAppling, Jeff Davis39 min
Jul 17, 1:37 PM EDTSpecial Weather StatementJAXCoffee38 min
Jul 17, 1:41 PM EDTSevere Thunderstorm WarningJAXCoffee49 min
Jul 17, 2:25 PM EDTSevere Thunderstorm WarningJAXAtkinson, Coffee50 min
Jul 17, 2:53 PM EDTSpecial Weather StatementJAXAtkinson37 min
Jul 17, 3:20 PM EDTSpecial Weather StatementJAXClinch40 min
Jul 17, 4:09 PM EDTSpecial Weather StatementJAXCamden36 min
Jul 17, 4:51 PM EDTSpecial Weather StatementJAXCharlton24 min
Jul 17, 4:55 PM EDTSpecial Weather StatementJAXBrantley35 min

Nearby

Special Weather Statements in Florida, 2012Every special weather statement 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; radar from the NEXRAD Level II archive.