Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 296, NWS Jacksonville, FL

August 22, 2015Nassau County, Florida; Camden County, Georgia

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 22, 2015, 9:15 PM EDT for Nassau County, Florida; Camden County, Georgia. It was in force for 45 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
Aug 22, 2015, 9:15 PM EDT (01:15 UTC)
Expired
Aug 22, 2015, 10:00 PM EDT
In force
45 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

Counties Nassau County, FL, Camden County, GA

The radar

The Jacksonville radar (KJAX), 31 km from the middle of the area, began a volume at 01:16 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, 1.3 hours before the alert went out and 30 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 2015-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1980 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 2015-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
1980 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
1031 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
14 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 Aug 22, 9:06 PM EDT, 9 minutes earlier.

Area forecast discussion, Aug 22, 9:06 PM EDT, 9 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
906 PM EDT SAT AUG 22 2015

.UPDATE...
ISOLATED TO SCATTERED ACTIVITY HAS DIMINISHED ACROSS NORTHEAST
FLORIDA HAS DIMINISHED. FURTHER NORTH...A CLUSTER OF STORMS THAT
DEVELOPED LATE IN THE AFTN ACROSS SOUTH CAROLINA/GEORGIA CLOSE
TO A DECAYING SURFACE FRONT HAVE MOVED SOUTH INTO SE GEORGIA
PRODUCING STRONG WINDS. THIS CLUSTER WILL BEGIN TO WEAKEN OVER
THE NEXT HOUR OR TWO AS IT APPROACHED NE FLORIDA. WILL INCLUDE
SCATTERED TSTMS OVER NE FLORIDA LATE THIS EVENING FOR THIS
POTENTIAL. LOWS IN THE MID 70S WILL GENERALLY PREVAIL.

&&

.AVIATION...
VFR WILL PREVAIL FOR THE NEXT 24 HOURS. WILL USE VCTS FOR SSI
FOR THE NEXT HOUR OR SO WITH MOST OF THE ACTIVITY REMAINING TO
THE WEST.

&&

.MARINE...
ONSHORE WINDS 5 TO 10 KNOTS WILL PREVAIL FOR THE NEXT 24 HOURS.

RIP CURRENTS: LOW RISK.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  75  93  74  95 /  10  50  30  30
SSI  78  88  78  91 /  40  20  30  20
JAX  75  92  75  93 /  40  40  30  30
SGJ  77  89  76  90 /  10  20  30  30
GNV  75  93  74  94 /  30  50  40  30
OCF  75  93  74  94 /  30  50  30  40

&&

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

ALLEN/SHULER/GUILLET
Hazardous weather outlook, Aug 22, 9:58 AM EDT, 11 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
958 AM EDT SAT AUG 22 2015

AMZ450-452-454-470-472-474-FLZ020>025-030>033-035>038-040-124-125-
GAZ132>136-149>154-162>166-230845-
COASTAL WATERS FROM ALTAMAHA SOUND TO FERNANDINA BEACH FL OUT
20 NM-
COASTAL WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL OUT
20 NM-
COASTAL WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL OUT 20 NM-
WATERS FROM ALTAMAHA SOUND GA TO FERNANDINA BEACH FL FROM 20 TO
60 NM-
WATERS FROM FERNANDINA BEACH TO ST. AUGUSTINE FL FROM 20 TO 60 NM-
WATERS FROM ST. AUGUSTINE TO FLAGLER BEACH FL FROM 20 TO 60 NM-
HAMILTON-SUWANNEE-COLUMBIA-BAKER-INLAND NASSAU-INLAND DUVAL-UNION-
BRADFORD-CLAY-ST. JOHNS-GILCHRIST-ALACHUA-PUTNAM-FLAGLER-MARION-
COASTAL NASSAU-COASTAL DUVAL-COFFEE-JEFF DAVIS-BACON-APPLING-
WAYNE-ATKINSON-WARE-PIERCE-BRANTLEY-INLAND GLYNN-COASTAL GLYNN-
ECHOLS-CLINCH-CHARLTON-INLAND CAMDEN-COASTAL CAMDEN-
958 AM EDT SAT AUG 22 2015

...STRONG TO SEVERE THUNDERSTORMS POSSIBLE SUNDAY AFTERNOON AND
EVENING...

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

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

WIDELY SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED...MOSTLY AT INLAND LOCATIONS. A FEW STRONG THUNDERSTORMS
ARE POSSIBLE...MOSTLY ALONG THE INTERSTATE 75 CORRIDOR DURING THE
LATE AFTERNOON AND EARLY EVENING HOURS. STRONGER ACTIVITY WILL BE
CAPABLE OF PRODUCING GUSTY WINDS...FREQUENT LIGHTNING...AND
LOCALIZED FLOODING DUE TO EXPECTED SLOW MOVEMENT OF THUNDERSTORMS.

HEAT INDEX VALUES WILL PEAK AT 102-107 DEGREES THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...
SCATTERED TO NUMEROUS AFTERNOON AND EVENING THUNDERSTORMS ARE
EXPECTED ON SUNDAY. STRONG TO LOCALLY SEVERE THUNDERSTORMS WILL BE
POSSIBLE...WITH DAMAGING WIND GUSTS AND FREQUENT LIGHTNING STRIKES
BEING THE PRIMARY THREATS AS ACTIVITY MOVES GENERALLY
SOUTHEASTWARD AT 10-15 MPH.

A FRONTAL BOUNDARY WILL STALL OVER OUR REGION NEXT WEEK...CREATING
SCATTERED MAINLY AFTERNOON AND EVENING THUNDERSTORMS. STRONG
THUNDERSTORMS WILL BE POSSIBLE EACH DAY...MAINLY OVER NORTHEAST
AND NORTH CENTRAL FLORIDA AND COASTAL SOUTHEAST GEORGIA. STRONGER
ACTIVITY WILL BE CAPABLE OF PRODUCING GUSTY WINDS AND FREQUENT
LIGHTNING STRIKES.

LONG PERIOD SWELLS FROM DISTANT HURRICANE DANNY MAY REACH OUR
COASTAL WATERS TOWARDS MIDWEEK...WHICH WOULD INCREASE THE THREAT
FOR RIP CURRENTS AT AREA BEACHES.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY.

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

PLW

In the hours before

Special weather statement, Aug 22, 5:15 PM EDT, 4 hours before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
515 PM EDT SAT AUG 22 2015

FLZ040-222145-
MARION FL-
515 PM EDT SAT AUG 22 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN MARION COUNTY UNTIL
545 PM EDT...

AT 514 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
RAINBOW LAKES ESTATES...MOVING SOUTH AT 10 MPH.

HAIL UP TO NICKEL SIZE IN DIAMETER AND GUSTY WINDS OF 45 TO 55 MPH
CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

LOCATIONS IMPACTED INCLUDE...
RAINBOW LAKES ESTATES...DUNNELLON AND ROMEO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...
REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

LAT...LON 2900 8236 2900 8237 2901 8240 2902 8240
      2901 8242 2902 8242 2905 8246 2905 8249
      2904 8250 2904 8253 2922 8253 2922 8229
      2897 8230
TIME...MOT...LOC 2114Z 039DEG 10KT 2916 8247

ALLEN
Special weather statement, Aug 22, 7:35 PM EDT, 1 hour 40 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
735 PM EDT SAT AUG 22 2015

GAZ136-152>154-230015-
INLAND GLYNN GA-WAYNE GA-BRANTLEY GA-COASTAL GLYNN GA-
735 PM EDT SAT AUG 22 2015

...SIGNIFICANT WEATHER ADVISORY FOR GLYNN...NORTHEASTERN BRANTLEY AND
SOUTHEASTERN WAYNE COUNTIES UNTIL 815 PM EDT...

AT 734 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
COX...OR 9 MILES SOUTH OF TIBET...MOVING SOUTH AT 15 MPH.

HAIL UP TO NICKEL SIZE IN DIAMETER AND GUSTY WINDS OF 45 TO 55 MPH
CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

LOCATIONS IMPACTED INCLUDE...
BRUNSWICK...GARDI...DOCK JUNCTION...WAYNESVILLE...EVERETT...
THALMANN...COUNTRY CLUB ESTATES...ATKINSON...MOUNT PLEASANT AND BOYS
ESTATE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...
REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 3122 8144 3112 8146 3113 8150 3122 8156
      3117 8153 3114 8153 3115 8154 3114 8154
      3122 8191 3158 8185 3155 8167 3150 8165
      3147 8161 3140 8158 3133 8147 3133 8143
      3131 8144 3129 8140
TIME...MOT...LOC 2334Z 015DEG 13KT 3147 8160

ALLEN
Special weather statement, Aug 22, 8:45 PM EDT, 30 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 9:50 PM EDTSpecial Weather StatementJAXHamilton40 min
Aug 22, 9:58 PM EDTSpecial Weather StatementJAXDuval32 min
Aug 22, 10:08 PM EDTSpecial Weather StatementJAXUnion52 min
Aug 22, 10:18 PM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee57 min
Aug 22, 10:32 PM EDTSpecial Weather StatementJAXUnion58 min
Aug 22, 10:49 PM EDTAreal Flood AdvisoryJAXHamilton86 min
Aug 22, 10:53 PM EDTSevere Thunderstorm WarningJAXColumbia, Hamilton, Suwannee37 min
Aug 22, 11:12 PM EDTSpecial Weather StatementJAXSuwannee63 min
Aug 22, 11:14 PM EDTAreal Flood AdvisoryJAXColumbia, Hamilton, Suwannee91 min
Aug 22, 11:27 PM EDTSevere Thunderstorm WarningJAXColumbia, Gilchrist, Suwannee63 min
Aug 22, 11:56 PM EDTAreal Flood AdvisoryJAXColumbia, Gilchrist, Suwannee94 min
Aug 23, 12:20 AM EDTSpecial Weather StatementJAXGilchrist55 min
Aug 23, 12:29 AM EDTAreal Flood AdvisoryJAXGilchrist91 min
Aug 23, 3:44 PM EDTSpecial Weather StatementJAXSuwannee46 min
Aug 23, 4:00 PM EDTSpecial Weather StatementJAXHamilton45 min
Aug 23, 4:26 PM EDTSpecial Marine WarningJAX49 min
Aug 23, 4:31 PM EDTSpecial Weather StatementJAXColumbia44 min
Aug 23, 4:37 PM EDTSpecial Marine WarningJAX53 min
Aug 23, 4:50 PM EDTSevere Thunderstorm WarningJAXBaker, Columbia40 min
Aug 23, 4:59 PM EDTSpecial Weather StatementJAXAlachua, Baker, Bradford, Columbia, Union46 min
Aug 23, 5:03 PM EDTSevere Thunderstorm WarningJAXNassau27 min
Aug 23, 5:13 PM EDTSpecial Marine WarningJAX92 min
Aug 23, 5:17 PM EDTSevere Thunderstorm WarningJAXDuval, Nassau58 min
Aug 23, 5:39 PM EDTSpecial Weather StatementJAXAlachua, Bradford, Clay, Union51 min
Aug 23, 6:05 PM EDTSevere Thunderstorm WarningJAXDuval, Saint Johns25 min
Aug 23, 6:24 PM EDTSpecial Weather StatementJAXClay, Putnam, Saint Johns51 min
Aug 23, 6:25 PM EDTSpecial Marine WarningJAX95 min
Aug 23, 6:35 PM EDTSpecial Weather StatementJAXDuval40 min
Aug 23, 7:26 PM EDTSpecial Weather StatementJAXFlagler, Putnam, Saint Johns49 min
Aug 23, 7:41 PM EDTAreal Flood AdvisoryJAXFlagler, Marion, Putnam, Saint Johns2 hr
Aug 22, 8:13 PM EDTSevere Thunderstorm WarningJAXBrantley, Glynn, Wayne32 min
Aug 22, 8:35 PM EDTSevere Thunderstorm WarningJAXCamden40 min
Aug 22, 8:45 PM EDTSpecial Weather StatementJAXBrantley, Ware30 min
Aug 22, 9:01 PM EDTSevere Thunderstorm WarningJAXBrantley, Charlton, Pierce, Ware29 min
Aug 22, 9:51 PM EDTSpecial Weather StatementJAXCharlton39 min
Aug 22, 9:52 PM EDTSpecial Weather StatementJAXClinch, Ware38 min
Aug 23, 1:49 PM EDTSpecial Weather StatementJAXCoffee56 min
Aug 23, 2:15 PM EDTSpecial Weather StatementJAXAppling45 min
Aug 23, 2:46 PM EDTSpecial Weather StatementJAXAtkinson44 min
Aug 23, 3:12 PM EDTSpecial Weather StatementJAXBrantley, Pierce, Wayne48 min
Aug 23, 3:37 PM EDTSevere Thunderstorm WarningJAXClinch38 min
Aug 23, 4:04 PM EDTSpecial Weather StatementJAXBrantley41 min
Aug 23, 4:18 PM EDTSpecial Weather StatementJAXCharlton, Clinch, Ware42 min
Aug 23, 4:42 PM EDTSpecial Weather StatementJAXCamden, Glynn33 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015Severe Thunderstorm Warnings in Georgia, 2015Every severe thunderstorm warning in 2015

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.