Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 97, NWS Jacksonville, FL

June 4, 2009Saint Johns County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 4, 2009, 5:49 PM EDT for Saint Johns County, Florida. It was in force for 26 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
Jun 4, 2009, 5:49 PM EDT (21:49 UTC)
Expired
Jun 4, 2009, 6:15 PM EDT
In force
26 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 21:52 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 9.8 hours before the alert went out and 183 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, Cape Canaveral, FL at 12:00Z on 2009-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 916 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, Cape Canaveral, FL at 12:00Z on 2009-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
916 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
755 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
36 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 Jun 4, 2:07 PM EDT, 3 hours 42 minutes earlier.

Area forecast discussion, Jun 4, 2:07 PM EDT, 3 hours 42 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
207 PM EDT THU JUN 4 2009

...RAIN CHANCE REMAINS HIGH THROUGH FRIDAY...

.SHORT TERM...SHORTWAVE TROUGH OVER THE NRN GULF IS DRIFTING
SLOWLY EAST. A FRONTAL BOUNDARY IS LOCATED WITHIN A BROAD AREA OF
LOW PRESSURE FROM LOWER MS VALLEY TO ERN TN. THE FRONT WILL
APPROACH SLOWLY THRU FRI STALLING AT OUR NW BORDER FRI NIGHT AND
SATURDAY. DEEP SWLY FLOW OVER THE AREA WILL CONTINUE TO PULL GULF
MOISTURE OVER THE REGION AND WITH PWATS HOVERING AROUND 2 INCHES
THERE WILL CONTINUE TO BE ABOVE NORMAL CHANCES THRU FRIDAY. WILL
KEEP LIKELY POPS THIS EVENING AND AGAIN FRI AFTN.

MODELS INDICATE THE SHORTWAVE WILL BE CUT-OFF FROM THE MAIN FLOW
LEAVING AN UPPER LOW BEHIND OVER THE AREA THIS WEEKEND. WILL GO
WITH SCATTERED STORMS FOR SAT/SUN...BUT DEPENDING ON LOCATION OF
UPPER LOW AND A SURFACE LOW...POPS MAY NEED TO BE INCREASED. IF
DRIER AIR MOVES IN AT MID LEVELS PER GFS...THEN MORE HEATING WILL
OCCUR THEN WILL HAVE A HIGHER POTENTIAL FOR STORMS PRODUCING
STRONG AND GUSTY WINDS.

.LONG TERM...MED RANGE MODELS STILL ADVERTISE A RETURN TO NEAR
NORMAL TEMPS/POPS AS SURFACE RIDGE BUILDS OVER N FL. A GENERALLY
SE TO SLY FLOW WILL PREVAIL WITH AFTN SEABREEZES PROVIDING FOCUS
FOR DIURNAL STORMS EACH DAY. A SERIES OF SHORTWAVES ALOFT WILL
ENHANCE CONVECTION AT TIMES.

&&

.AVIATION...LOOKS AS THOUGH THE INITIAL WAVE OF TSRA WILL REMAIN
WEST OF THE TERMINALS WITH THE EXCEPTION OF KGNV WHERE TEMPO
GROUPS BEGIN AT 19Z. MAIN IMPACT WILL BE AFT 21Z WITH INCREASING
COVERAGE EXPECTED FOR THE EAST COAST TERMINALS. DUE TO THE LONG
PERIOD NATURE OF TSRA POSSIBLE THIS EVENING...HAVE TRIED TO TARGET
JUST A 4 HOUR PERIOD AND LIMITED TO GENERIC TSRA WITH WIND GUSTS
BUT LIMITED CIG REDUCTION. THIS MAY NEED TO BE REVISED WITH
AMENDMENTS AS ACTIVITY NEARS AS UPSTREAM SITES HAVE ALREADY
REPORTED IFR CIGS IN TSRA.

&&

.MARINE...WINDS WILL INCREASE IN ADVANCE OF LOW PRESSURE SYSTEM
AND IN COMBINATION WITH HIGH PRESSURE WELL OUT OVER THE ATLANTIC.
USING A BLEND...THIS STILL KEEPS WINDS BELOW SCEC WHICH MATCHES
CURRENTS OBS. STILL WILL NEED TO MONITOR THIS CLOSELY AS THE
EVENING PROGRESSES AS EVENING SURGE COULD RESULT IN HIGHER THAN
FORECAST WINDS. REMAINDER OF THE FORECAST WILL HINGE ON
PROGRESSION OR LACK THEREOF OF WEAK SURFACE LOW WEST OF THE
WATERS. MODELS HAVE A DECENT HANDLE ON IT FOR NOW AND WILL USE A
BLEND OF GFS...NAM12 AND PREVIOUS FORECAST.

&&

.PRELIMINARY POINT TEMPS/POPS...
AMG  67  84  66  87 /  60  70  40  50
SSI  70  84  71  84 /  60  70  40  40
JAX  69  85  69  86 /  60  70  30  40
SGJ  71  84  70  85 /  60  70  30  40
GNV  67  85  67  87 /  50  60  30  40
OCF  69  84  68  86 /  50  60  30  40

&&

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

TRABERT/DEESE/KERNS
Hazardous weather outlook, Jun 4, 5:12 AM EDT, 12 hours 37 minutes before
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In the hours before

Special weather statement, Jun 4, 4:38 PM EDT, 1 hour 11 minutes before
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Special weather statement, Jun 4, 4:47 PM EDT, 1 hour 2 minutes before
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Special weather statement, Jun 4, 5:04 PM EDT, 45 minutes before
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Special weather statement, Jun 4, 5:05 PM EDT, 44 minutes before
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Special weather statement, Jun 4, 5:10 PM EDT, 39 minutes before
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Special weather statement, Jun 4, 5:40 PM EDT, 9 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 12:11 PM EDTSpecial Weather StatementJAXSuwannee49 min
Jun 4, 12:18 PM EDTSpecial Weather StatementJAXMarion27 min
Jun 4, 1:08 PM EDTSpecial Weather StatementJAXHamilton37 min
Jun 4, 1:32 PM EDTSpecial Weather StatementJAXMarion28 min
Jun 4, 2:06 PM EDTSpecial Weather StatementJAXMarion24 min
Jun 4, 2:12 PM EDTSpecial Weather StatementJAXPutnam33 min
Jun 4, 2:17 PM EDTSpecial Weather StatementJAXUnion28 min
Jun 4, 2:51 PM EDTSpecial Weather StatementJAXSaint Johns24 min
Jun 4, 2:52 PM EDTSpecial Weather StatementJAXPutnam23 min
Jun 4, 2:53 PM EDTSpecial Weather StatementJAXUnion37 min
Jun 4, 3:29 PM EDTSpecial Weather StatementJAXFlagler46 min
Jun 4, 3:35 PM EDTSpecial Weather StatementJAXSaint Johns40 min
Jun 4, 3:36 PM EDTSpecial Marine WarningJAX82 min
Jun 4, 3:40 PM EDTAreal Flood AdvisoryJAXDuval, Saint Johns2 hr
Jun 4, 3:48 PM EDTAreal Flood AdvisoryJAXNassau117 min
Jun 4, 3:49 PM EDTSpecial Weather StatementJAXClay41 min
Jun 4, 3:56 PM EDTSpecial Marine WarningJAX64 min
Jun 4, 4:04 PM EDTSpecial Marine WarningJAX86 min
Jun 4, 4:08 PM EDTSpecial Marine WarningJAX97 min
Jun 4, 4:11 PM EDTSpecial Weather StatementJAXBradford49 min
Jun 4, 4:28 PM EDTSpecial Weather StatementJAXDuval47 min
Jun 4, 4:30 PM EDTSpecial Marine WarningJAX2 hr
Jun 4, 4:38 PM EDTSpecial Weather StatementJAXColumbia52 min
Jun 4, 4:47 PM EDTSpecial Weather StatementJAXPutnam43 min
Jun 4, 4:51 PM EDTSpecial Marine WarningJAX84 min
Jun 4, 5:04 PM EDTSpecial Weather StatementJAXNassau26 min
Jun 4, 5:05 PM EDTSpecial Weather StatementJAXBaker40 min
Jun 4, 5:10 PM EDTSpecial Weather StatementJAXMarion50 min
Jun 4, 5:40 PM EDTSpecial Weather StatementJAXSaint Johns50 min
Jun 4, 5:42 PM EDTSpecial Marine WarningJAX90 min
Jun 4, 5:55 PM EDTAreal Flood AdvisoryJAXFlagler, Putnam, Saint Johns65 min
Jun 4, 5:59 PM EDTSpecial Weather StatementJAXClay
Jun 4, 7:11 PM EDTSpecial Marine WarningJAX2 hr
Jun 4, 1:36 PM EDTSpecial Weather StatementJAXClinch, Echols39 min
Jun 4, 1:55 PM EDTSpecial Weather StatementJAXBacon35 min
Jun 4, 2:04 PM EDTSpecial Weather StatementJAXCharlton, Ware26 min
Jun 4, 2:32 PM EDTSpecial Weather StatementJAXBrantley, Charlton, Ware43 min
Jun 4, 2:45 PM EDTSpecial Weather StatementJAXBrantley, Wayne60 min
Jun 4, 3:11 PM EDTSpecial Weather StatementJAXCamden49 min
Jun 4, 3:20 PM EDTSpecial Weather StatementJAXCamden40 min
Jun 4, 3:25 PM EDTSpecial Weather StatementJAXCharlton50 min
Jun 4, 3:45 PM EDTSpecial Weather StatementJAXGlynn60 min
Jun 4, 4:04 PM EDTSpecial Weather StatementJAXCamden41 min
Jun 4, 4:18 PM EDTSpecial Weather StatementJAXCamden57 min
Jun 4, 4:20 PM EDTSevere Thunderstorm WarningJAXCamden, Glynn40 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009Every severe thunderstorm warning in 2009

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.