Alert archive / Florida / Red Flag Warnings in 2008

Red Flag Warning 18, NWS Jacksonville, FL

February 18, 20087 counties in Florida

NWS Jacksonville, FL issued this red flag warning at Feb 18, 2008, 3:43 AM EST for 7 counties in Florida. It took effect at Feb 19, 2008, 11:00 AM EST. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 18, 2008, 3:43 AM EST (08:43 UTC)
In effect from: Feb 19, 2008, 11:00 AM EST
Expired: Feb 19, 2008, 7:00 PM EST
In force: 8 hr
Issued by: NWS Jacksonville, FL

Counties Baker County, FL, Bradford County, FL, Flagler County, FL, Gilchrist County, FL, Nassau County, FL, Suwannee County, FL, Union County, FL

The radar

The Jacksonville radar (KJAX), 71 km from the middle of the area, began a volume at 08:45 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 8.7 hours before the alert went out and 202 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: 593 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 478 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 274 m²/s²
0-3 km storm-relative helicity: 290 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 6.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this red flag 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 red flag warning went out at Feb 17, 9:15 PM EST, 6 hours 28 minutes earlier.

Area forecast discussion, Feb 17, 9:15 PM EST, 6 hours 28 minutes before

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Hazardous weather outlook, Feb 17, 8:20 PM EST, 7 hours 23 minutes before

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In the hours before

Special weather statement, Feb 18, 1:34 AM EST, 2 hours 9 minutes before

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Special weather statement, Feb 18, 1:56 AM EST, 1 hour 47 minutes before

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Special weather statement, Feb 18, 2:28 AM EST, 1 hour 15 minutes before

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Special weather statement, Feb 18, 3:05 AM EST, 38 minutes before

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Special weather statement, Feb 18, 3:10 AM EST, 33 minutes before

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Special weather statement, Feb 18, 3:35 AM EST, 8 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
Feb 18, 3:30 AM EST	Lake Wind Advisory	JAX	Bradford, Flagler, Nassau	13 hr
Feb 18, 3:43 AM EST	Fire Weather Watch	JAX	Baker, Bradford, Gilchrist, Nassau, Suwannee, Union	35 hr
Feb 18, 11:30 AM EST	Special Marine Warning	JAX		90 min
Feb 18, 1:02 PM EST	Special Marine Warning	JAX		88 min
Feb 17, 11:49 PM EST	Severe Thunderstorm Warning	JAX	Appling, Atkinson, Bacon, Coffee, Jeff Davis, Pierce and 1 more	40 min

Nearby

Red Flag Warnings in Florida, 2008 Every red flag 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.