Alert archive / Florida / Red Flag Warnings in 2008

Red Flag Warning 56, NWS Jacksonville, FL

May 12, 20087 counties in Florida

NWS Jacksonville, FL issued this red flag warning at May 12, 2008, 2:52 PM EDT for 7 counties in Florida. It took effect at May 13, 2008, 4:13 AM EDT. It was in force for 15 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: May 12, 2008, 2:52 PM EDT (18:52 UTC)
In effect from: May 13, 2008, 4:13 AM EDT
Expired: May 13, 2008, 7:00 PM EDT
In force: 15 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 18:54 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, 6.9 hours before the alert went out and 243 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: 157 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 789 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.4

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 May 12, 2:33 PM EDT, 19 minutes earlier.

Area forecast discussion, May 12, 2:33 PM EDT, 19 minutes before

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Hazardous weather outlook, May 12, 4:16 AM EDT, 10 hours 36 minutes before

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In the hours before

Local storm report, May 12, 11:20 AM EDT, 3 hours 32 minutes before

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Local storm report, May 12, 11:22 AM EDT, 3 hours 30 minutes before

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Local storm report, May 12, 1:49 PM EDT, 1 hour 3 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
May 11, 8:30 PM EDT	Tornado Warning	JAX	Nassau	30 min
May 11, 8:59 PM EDT	Tornado Warning	JAX	Nassau	31 min
May 11, 9:06 PM EDT	Special Marine Warning	JAX		54 min
May 11, 8:19 PM EDT	Severe Thunderstorm Warning	JAX	Camden, Charlton	41 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.