Alert archive / Florida / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 359, NWS Jacksonville, FL

August 25, 2008Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 25, 2008, 3:38 PM EDT for Saint Johns County, Florida. It was in force for 52 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 25, 2008, 3:38 PM EDT (19:38 UTC)
Expired
Aug 25, 2008, 4:30 PM EDT
In force
52 min
Issued by
NWS Jacksonville, FL
Area
Storm-based polygon

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 70 km from the middle of the area, began a volume at 19:41 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

Tampa Bay, FL (KTBW), launched 12:00Z, 7.6 hours before the alert went out and 264 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, Tampa Bay, FL at 12:00Z on 2008-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1263 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, Tampa Bay, FL at 12:00Z on 2008-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 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
1263 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
855 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
-12 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 25, 1:53 PM EDT, 1 hour 45 minutes earlier.

Area forecast discussion, Aug 25, 1:53 PM EDT, 1 hour 45 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
153 PM EDT MON AUG 25 2008

.SHORT TERM...CONVECTION IS STARTING TO POP ACROSS THE JAX CWA THIS
HOUR AS TEMPS RISE TO CONVECTIVE TEMP VALUES IN THE UPPER 80S.
WIDESPREAD ACTIVITY ACROSS THE SUWANNEE RIVER VALLEY WILL TRACK NNE
THROUGH THE REMAINDER OF THE AFTN AND MERGE WITH THE EAST COAST SEA
BREEZE FRONT WHICH SHOULD MAKE IT INLAND TO ALONG OR JUST W OF THE
I-95 CORRIDOR. FREQ LIGHTNING AND PERIODS OF HEAVY RAINFALL WITH
CONTINUE TO BE THE PRIMARY CONCERNS TODAY.

MEAN LAYER HIGH PRESSURE WILL RETROGRADE FROM THE WESTERN ATLANTIC
TOWARD THE GOMEX THROUGH WED. A PREVAILING SW STEERING FLOW WILL
FOCUS THE HIGHEST CHANCES OF AFTN TSRA TOWARD EASTERN SECTIONS OF
OUR CWA. TONIGHT EXPECT DRIER AIR WITH PWATS BELOW 2 INCHES OVER THE
GOMEX TO MOVE ACROSS OUR AREA FOR TUE WHICH WILL TAKE AFTN POPS DOWN
ACROSS OUR FL ZONES TO THE CHANCE CATEGORY...WHILE MAINTAINING
LIKELY POPS ACROSS OUR GA ZONES WHERE MOISTURE WILL BE DEEPER AND
DPVA STRONGER AS THE REMNANTS OF FAY SLOWLY TRACK NNE TOWARD THE MID
ATLANTIC REGION. WED INTO THU A TRAILING PLUME OF MOISTURE ALONG A
WAKE TROUGH FROM THE REMNANTS OF FAY WILL SAG ACROSS OUR GA ZONES
WHICH...ALONG WITH THE SEA BREEZES...WILL ENHANCE AFTN CONVECTION.
MAIN SHORT TERM CONCERNS WILL BE GUSTY WINDS TUE (DRIER AIR ALOFT)
THEN RETURN TO FREQ LIGHTNING AND PERIODS OF HVY RA WED AND THU.

.LONG TERM...LATEST OPERATIONAL MEX GUIDANCE CONTINUES TO ADVERTISE
A RETURN TO NEAR CLIMO TEMPS AND DIURNALLY DRIVEN CONVECTION IN THE
MID CHANCE RANGE OF 30-40%.

&&

.AVIATION...SCT TO NUMEROUS SHOWERS AND STORMS WILL CONTINUE
ACROSS THE REGION THRU THE EVENING...WITH IFR CONDITIONS LIKELY AT
TIMES. WILL CONTINUE THE TEMPO FOR APPROX 3 HOURS BETWEEN 18Z AND
23Z AT ALL SITES. SOME MVFR PATCHY FOG IS POSSIBLE TONIGHT DUE TO
WET GROUND ESPECIALLY AT GNV. OTHER SITES DID NOT EXPERIENCE FOG
LAST NIGHT AND WILL KEEP VFR CONDS FOR NOW.

&&

.MARINE...WINDS WILL REMAIN GENERALLY SOUTHERLY THIS WEEK AS
BERMUDA HIGH BUILDS OVER THE SOUTHWESTERN ATLANTIC. WIND SPEEDS
WILL BE NEAR 10 KT AND SEAS WILL BE 2-4 FT.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  71  89  71  88 /  30  60  50  60
SSI  75  86  74  86 /  30  40  30  40
JAX  73  89  73  89 /  30  50  30  40
SGJ  74  88  74  87 /  30  40  30  30
GNV  73  90  73  89 /  20  50  30  40
OCF  72  90  72  90 /  20  40  30  40

&&

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

ENYEDI/TRABERT/KEEGAN
Hazardous weather outlook, Aug 25, 5:10 AM EDT, 10 hours 28 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
510 AM EDT MON AUG 25 2008

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-261000-
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-
510 AM EDT MON AUG 25 2008

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

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

...RIVER FLOOD WARNINGS IN EFFECT FOR PORTIONS OF NORTHEAST
FLORIDA...
...MODERATE RISK OF RIP CURRENTS...

RIVER FLOOD WARNINGS ARE IN EFFECT FOR THE SAINT MARYS RIVER...THE
SANTA FE RIVER AND BLACK CREEK IN NORTHEAST FLORIDA. REFER TO LOCAL
FLOOD WARNING PRODUCTS FOR DETAILS.

SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED AGAIN
TODAY. LOCALLY HEAVY RAINFALL WILL BE POSSIBLE AND EXCESSIVE RUNOFF
MAY CAUSE TEMPORARY FLOODING OF LOW-LYING AND POOR DRAINAGE AREAS.
GUSTY WINDS OVER 40 MPH AND FREQUENT LIGHTNING CAN BE EXPECTED WITH
THE STRONGEST STORMS.

A MODERATE RISK OF RIP CURRENTS IS EXPECTED DUE TO CONTINUED
EASTERLY SWELLS AND PREVIOUS RIP CURRENT CHANNELS THAT DEVELOPED DUE
TO ROUGH SURF FROM FAY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE MUCH
OF THIS WEEK DUE TO A LINGERING TROPICAL AIRMASS. LOCALLY HEAVY
RAINFALL WILL BE POSSIBLE ALONG WITH GUSTY WINDS IN STRONG
THUNDERSTORMS MAINLY DURING THE AFTERNOON AND EVENING HOURS. RAIN
CHANCES MAY DECREASE BY LATE IN THE WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ARE REQUESTED TO SELF-ACTIVATE IN THE EVENT OF WARNINGS BEING
ISSUED OR OCCURRENCE OF ADDITIONAL FLOODING.

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

CARROLL

In the hours before

Local storm report, Aug 25, 10:43 AM EDT, 4 hours 55 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1043 AM EDT MON AUG 25 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0700 AM     TROPICAL STORM   6 ENE ARLINGTON         30.37N 81.51W
08/23/2008                   DUVAL              FL   NWS EMPLOYEE

            THE TOP PORTION OF A LARGE OAK TREE BROKE OFF AND PUNCHED
            A HOLE THROUGH THE ROOF OF A HOUSE IN THE HIDDEN HILLS
            SUBDIVISION IN JACKSONVILLE.

&&

MTRABERT
Special weather statement, Aug 25, 2:25 PM EDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
225 PM EDT MON AUG 25 2008

GAZ132-251915-
COFFEE-
225 PM EDT MON AUG 25 2008

...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR NORTHWESTERN
COFFEE COUNTY FOR EXCESSIVE LIGHTNING VALID UNTIL 315 PM EDT...

AT 225 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 4 MILES NORTHEAST OF AMBROSE...MOVING
NORTH AT 15 MPH. THIS STRONG THUNDERSTORM WILL ALSO AFFECT AREAS
AROUND BROXTON...AMBROSE AND PRIDGEN THROUGH 315 PM EDT. EXCESSIVE
CLOUD-TO-GROUND LIGHTNING CAN BE EXPECTED. POSTPONE OUTDOOR
ACTIVITIES PROMPTLY. GO QUICKLY INSIDE A COMPLETELY ENCLOSED
BUILDING. UNPLUG ELECTRONIC DEVICES AND APPLIANCES AS THEY ARE
SUSCEPTIBLE TO POWER SURGES AND MAY BE DAMAGED BY NEARBY LIGHTNING
STRIKES.

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

ENYEDI
Special weather statement, Aug 25, 2:51 PM EDT, 47 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
251 PM EDT MON AUG 25 2008

FLZ033-038-251915-
FLAGLER-ST. JOHNS-
251 PM EDT MON AUG 25 2008

...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR EASTERN FLAGLER
AND SOUTHEASTERN ST. JOHNS COUNTIES FOR EXCESSIVE LIGHTNING VALID
UNTIL 315 PM EDT...

AT 251 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS CENTERED ALONG A LINE EXTENDING FROM 5 MILES WEST OF
PALM COAST TO 13 MILES SOUTH OF FLAGLER BEACH...MOVING NORTHEAST AT
19 MPH. THESE STRONG THUNDERSTORMS WILL ALSO AFFECT AREAS AROUND
ESPANOLA...BUNNELL...PALM COAST...FLAGLER BEACH AND CRESCENT BEACH
THROUGH 315 PM EDT. EXCESSIVE CLOUD-TO-GROUND LIGHTNING CAN BE
EXPECTED. POSTPONE OUTDOOR ACTIVITIES PROMPTLY. GO QUICKLY INSIDE A
COMPLETELY ENCLOSED BUILDING. UNPLUG ELECTRONIC DEVICES AND
APPLIANCES AS THEY ARE SUSCEPTIBLE TO POWER SURGES AND MAY BE DAMAGED
BY NEARBY LIGHTNING STRIKES. HEAVY RAINFALL WILL PRODUCE PONDING OF
WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING AREAS.

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

TRABERT
Special weather statement, Aug 25, 3:31 PM EDT, 7 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 24, 9:48 PM EDTAreal Flood WarningJAXPutnam12 hr
Aug 25, 3:06 PM EDTSpecial Marine WarningJAX114 min
Aug 25, 3:30 PM EDTRiver Flood WarningJAXAlachua, Bradford, Columbia, Gilchrist, Suwannee, Union9 days
Aug 25, 3:31 PM EDTAreal Flood AdvisoryJAXFlagler, Saint Johns119 min
Aug 25, 3:32 PM EDTSpecial Marine WarningJAX118 min
Aug 25, 3:49 PM EDTAreal Flood AdvisoryJAXDuval116 min
Aug 25, 4:30 PM EDTSpecial Marine WarningJAX90 min
Aug 25, 4:38 PM EDTAreal Flood AdvisoryJAXDuval112 min
Aug 25, 5:02 PM EDTAreal Flood AdvisoryJAXDuval, Nassau118 min

Nearby

Severe Thunderstorm Warnings in Florida, 2008Every severe thunderstorm warning in 2008

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.