Alert archive / Florida / Special Weather Statements in 2011

Special Weather Statement, NWS Jacksonville, FL

August 9, 2011Saint Johns County, Florida

NWS Jacksonville, FL issued this special weather statement at Aug 9, 2011, 12:46 PM EDT for Saint Johns County, Florida. It was in force for 29 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
Aug 9, 2011, 12:46 PM EDT (16:46 UTC)
Expired
Aug 9, 2011, 1:15 PM EDT
In force
29 min
Issued by
NWS Jacksonville, FL

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 87 km from the middle of the area, began a volume at 16:46 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, 4.8 hours before the alert went out and 88 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 2011-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 640 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 2011-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 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
640 J/kg
Mixed-layer CIN
-115 J/kg
Mixed-layer LCL
1043 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
-13 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 Aug 9, 9:50 AM EDT, 2 hours 56 minutes earlier.

Area forecast discussion, Aug 9, 9:50 AM EDT, 2 hours 56 minutes before
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Hazardous weather outlook, Aug 9, 11:20 AM EDT, 1 hour 26 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1120 AM EDT TUE AUG 9 2011

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-101000-
ALACHUA-APPLING-ATKINSON-BACON-BAKER-BRADFORD-BRANTLEY-
CAMDEN (COASTAL)-CAMDEN (INLAND)-CHARLTON-CLAY-CLINCH-COFFEE-
COLUMBIA-DUVAL-ECHOLS-FLAGLER-GILCHRIST-GLYNN (COASTAL)-
GLYNN (INLAND)-HAMILTON-JEFF DAVIS-MARION-NASSAU-PIERCE-PUTNAM-
ST JOHNS-SUWANNEE-UNION-WARE-WAYNE-
1120 AM EDT TUE AUG 9 2011

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

...HEAT ADVISORY IN EFFECT ACROSS SOUTHEAST GEORGIA...

...STRONG THUNDERSTORMS POSSIBLE THIS AFTERNOON AND EVENING...

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

DANGEROUS HEAT INDICES WILL TOP OUT AROUND 110 DEGREES ACROSS
SOUTHEAST GEORGIA AND A HEAT ADVISORY IS IN EFFECT. HEAT INDICES
WILL TOP OUT IN THE 105 TO 110 RANGE ACROSS NORTHEAST FLORIDA.
PLEASE REFER TO THE URGENT WEATHER MESSAGE FOR MORE DETAILS.

SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED TODAY. STRONG GUSTY
WINDS...EXCESSIVE LIGHTNING AND LOCALLY HEAVY RAINFALL IS EXPECTED
WITH THIS ACTIVITY THIS AFTERNOON AND EVENING. ISOLATED STRONG AND
SEVERE STORMS ARE POSSIBLE...MAINLY ACROSS SOUTHEAST GEORGIA.
STORM MOTION WILL BE TO THE EAST AROUND 15 TO 20 MPH. MARINERS
SHOULD BE ON THE LOOKOUT FOR THUNDERSTORMS MOVING OFFSHORE AFTER
1 PM...WHICH MAY PRODUCE WINDS OF 35 KNOTS.

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

DANGEROUS HEAT IS FORECAST THROUGH THE END OF THE WEEK WITH HEAT
INDICES ABOVE 105 EACH AFTERNOON. NEAR RECORD HIGH TEMPERATURES ARE
EXPECTED ON THURSDAY AND FRIDAY.

SCATTERED THUNDERSTORMS WILL OCCUR EACH AFTERNOON AND EVENING...
THOUGH ONLY ISOLATED THUNDERSTORMS ARE EXPECTED ON THURSDAY.
ISOLATED STRONG TO SEVERE STORMS WILL BE POSSIBLE EACH DAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE REQUESTED TO SELF-ACTIVATE IF WARNINGS ARE ISSUED FOR
THEIR AREA.

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 9, 10:32 AM EDT, 2 hours 14 minutes before
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Local storm report, Aug 9, 11:56 AM EDT, 50 minutes before
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Special weather statement, Aug 9, 12:46 PM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1246 PM EDT TUE AUG 9 2011

FLZ033-091715-
ST. JOHNS-
1246 PM EDT TUE AUG 9 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR SOUTHERN ST.
JOHNS COUNTY FOR STRONG WINDS AND EXCESSIVE LIGHTNING VALID UNTIL 115
PM EDT...

AT 1246 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 3 MILES NORTH OF SPUDS...OR 5 MILES
NORTH OF HASTINGS...MOVING EAST AT 25 MPH. THIS STRONG THUNDERSTORM
WILL ALSO AFFECT AREAS AROUND SPUDS...HASTINGS...ELKTON...SAINT
AUGUSTINE SOUTH...DUPONT CENTER...SAINT AUGUSTINE SHORES...VILANO
BEACH...SAINT AUGUSTINE...ANASTASIA AND BUTLER BEACH THROUGH 115 PM
EDT. EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55
MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

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

LAT...LON 2967 8123 2968 8152 2976 8152 2977 8154
      2987 8155 2996 8130 2982 8125 2980 8125
      2979 8124 2976 8124 2968 8120
TIME...MOT...LOC 1646Z 268DEG 20KT 2978 8145

TRABERT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 10:32 AM EDTSpecial Weather StatementJAXMarion43 min
Aug 9, 1:38 PM EDTSpecial Weather StatementJAXColumbia37 min
Aug 9, 3:02 PM EDTAreal Flood AdvisoryJAXDuval, Saint Johns87 min
Aug 9, 3:09 PM EDTSpecial Marine WarningJAX66 min
Aug 9, 3:39 PM EDTAreal Flood AdvisoryJAXDuval51 min
Aug 9, 4:17 PM EDTSpecial Weather StatementJAXNassau43 min
Aug 9, 4:25 PM EDTAreal Flood AdvisoryJAXNassau52 min
Aug 8, 8:59 PM EDTSpecial Weather StatementJAXJeff Davis46 min
Aug 9, 2:50 AM EDTHeat AdvisoryJAXAppling, Atkinson, Bacon, Brantley, Camden, Clinch and 6 more17 hr
Aug 9, 3:05 PM EDTSpecial Weather StatementJAXAtkinson40 min
Aug 9, 3:11 PM EDTSpecial Weather StatementJAXCharlton49 min
Aug 9, 3:42 PM EDTSpecial Weather StatementJAXCharlton48 min
Aug 9, 4:35 PM EDTSpecial Weather StatementJAXBrantley40 min
Aug 9, 5:15 PM EDTSpecial Weather StatementJAXClinch45 min
Aug 9, 5:22 PM EDTSpecial Weather StatementJAXBerrien38 min
Aug 9, 5:30 PM EDTAreal Flood AdvisoryJAXClinch, Ware60 min
Aug 9, 5:48 PM EDTSpecial Weather StatementJAXWayne42 min
Aug 9, 5:51 PM EDTSpecial Weather StatementJAXClinch39 min
Aug 9, 5:54 PM EDTAreal Flood AdvisoryJAXAtkinson, Coffee66 min
Aug 9, 5:57 PM EDTSpecial Weather StatementJAXJeff Davis48 min
Aug 9, 6:02 PM EDTSevere Thunderstorm WarningJAXCoffee, Jeff Davis26 min
Aug 9, 6:11 PM EDTSpecial Weather StatementJAXJeff Davis49 min
Aug 9, 6:15 PM EDTAreal Flood AdvisoryJAXAppling, Bacon, Coffee, Jeff Davis58 min
Aug 9, 6:20 PM EDTSevere Thunderstorm WarningJAXAppling, Bacon, Coffee, Jeff Davis40 min
Aug 9, 6:22 PM EDTSpecial Weather StatementJAXAppling53 min
Aug 9, 6:26 PM EDTSevere Thunderstorm WarningJAXAppling, Jeff Davis, Wayne49 min
Aug 9, 6:46 PM EDTSpecial Weather StatementJAXWare44 min
Aug 9, 6:54 PM EDTSpecial Weather StatementJAXBacon51 min
Aug 9, 6:56 PM EDTSevere Thunderstorm WarningJAXBacon, Coffee, Pierce, Ware35 min
Aug 9, 7:02 PM EDTSpecial Weather StatementJAXAppling, Wayne43 min
Aug 9, 7:04 PM EDTSpecial Weather StatementJAXAtkinson56 min
Aug 9, 7:16 PM EDTAreal Flood AdvisoryJAXAtkinson, Bacon, Clinch, Coffee, Ware84 min
Aug 9, 7:30 PM EDTSpecial Weather StatementJAXCoffee45 min
Aug 9, 7:36 PM EDTSpecial Weather StatementJAXLanier39 min

Nearby

Special Weather Statements in Florida, 2011Every special weather statement 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.