Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 261, NWS Jacksonville, FL

October 16, 2009Flagler County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Oct 16, 2009, 6:25 PM EDT for Flagler County, Florida. It was in force for 35 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: Oct 16, 2009, 6:25 PM EDT (22:25 UTC)
Expired: Oct 16, 2009, 7:00 PM EDT
In force: 35 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Flagler County, FL

The radar

The Jacksonville radar (KJAX), 119 km from the middle of the area, began a volume at 22:25 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, 10.4 hours before the alert went out and 135 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 938 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 908 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 15 m²/s²
0-3 km storm-relative helicity: 33 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 Oct 16, 4:47 PM EDT, 1 hour 38 minutes earlier.

Area forecast discussion, Oct 16, 4:47 PM EDT, 1 hour 38 minutes before

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Hazardous weather outlook, Oct 16, 4:15 AM EDT, 14 hours 10 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE JACKSONVILLE FL
415 AM EDT FRI OCT 16 2009

FLZ020>025-030>033-035>038-040-GAZ132>136-149>154-162>166-171000-
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-
415 AM EDT FRI OCT 16 2009

THIS OUTLOOK IS FOR NORTHEAST FLORIDA AND SOUTHEAST GEORGIA.

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

A COLD FRONT WILL MOVE ACROSS THE AREA TODAY. A LINE OF SHOWERS
AND THUNDERSTORMS PRECEDING THE FRONT WILL BE MOVING THROUGH.
SOME STORMS MAY BE STRONG ESPECIALLY ACROSS NORTHEAST FLORIDA.
THE MAIN CONCERNS WILL BE FREQUENT CLOUD TO GROUND LIGHTNING...
STRONG AND GUSTY WINDS...AND LOCALLY HEAVY RAIN. THE SHOWERS
AND STORMS WILL BE ENDING WITH THE PASSAGE OF THE FRONT THIS
AFTERNOON AND EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

A CHANCE OF THUNDERSTORMS WILL BE RETURNING TO THE AREA AGAIN
ON THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD SELF-ACTIVATE IF WARNINGS ARE ISSUED IN THEIR AREA.

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

PP/ARS

In the hours before

Special weather statement, Oct 16, 3:15 PM EDT, 3 hours 10 minutes before

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Special weather statement, Oct 16, 3:56 PM EDT, 2 hours 29 minutes before

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Local storm report, Oct 16, 3:57 PM EDT, 2 hours 28 minutes before

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Special weather statement, Oct 16, 4:01 PM EDT, 2 hours 24 minutes before

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Local storm report, Oct 16, 5:26 PM EDT, 59 minutes before

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Special weather statement, Oct 16, 6:05 PM EDT, 20 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 15, 8:02 PM EDT	Small Craft Advisory for Winds	JAX		20 hr
Oct 16, 7:11 AM EDT	Special Weather Statement	JAX	Gilchrist	49 min
Oct 16, 8:17 AM EDT	Special Weather Statement	JAX	Marion	43 min
Oct 16, 9:09 AM EDT	Special Weather Statement	JAX	Marion	51 min
Oct 16, 1:59 PM EDT	Special Weather Statement	JAX	Duval	61 min
Oct 16, 2:15 PM EDT	Special Weather Statement	JAX	Bradford, Clay	45 min
Oct 16, 2:27 PM EDT	Special Marine Warning	JAX		2 hr
Oct 16, 2:30 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Saint Johns	33 min
Oct 16, 2:31 PM EDT	Special Weather Statement	JAX	Alachua, Gilchrist	44 min
Oct 16, 3:15 PM EDT	Special Weather Statement	JAX	Alachua	60 min
Oct 16, 3:56 PM EDT	Special Weather Statement	JAX	Saint Johns	49 min
Oct 16, 3:59 PM EDT	Special Marine Warning	JAX		58 min
Oct 16, 4:01 PM EDT	Special Weather Statement	JAX	Duval	44 min
Oct 16, 4:24 PM EDT	Special Marine Warning	JAX		32 min
Oct 16, 4:37 PM EDT	Special Marine Warning	JAX		53 min
Oct 16, 4:55 PM EDT	Small Craft Advisory for Winds	JAX		5 hr
Oct 16, 6:05 PM EDT	Special Weather Statement	JAX	Flagler	40 min
Oct 15, 9:37 PM EDT	Special Weather Statement	JAX	Jeff Davis	38 min
Oct 15, 11:10 PM EDT	Special Weather Statement	JAX	Wayne	50 min
Oct 15, 11:47 PM EDT	Tornado Warning	JAX	Wayne	28 min
Oct 16, 5:23 AM EDT	Special Weather Statement	JAX	Atkinson, Clinch, Coffee	52 min
Oct 16, 6:14 AM EDT	Special Weather Statement	JAX	Pierce, Ware	46 min
Oct 16, 9:02 AM EDT	Areal Flood Advisory	JAX	Appling	88 min
Oct 16, 2:32 PM EDT	Special Weather Statement	JAX	Glynn	28 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009 Every 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.