Alert archive / Georgia / Red Flag Warnings in 2007

Red Flag Warning 54, NWS Jacksonville, FL

April 20, 2007Gilchrist County, Suwannee County, Florida; Brantley County, Clinch County, Echols County, Georgia

NWS Jacksonville, FL issued this red flag warning at Apr 20, 2007, 3:43 AM EDT for Gilchrist County, Suwannee County, Florida; Brantley County, Clinch County, Echols County, Georgia. It took effect at Apr 20, 2007, 9:40 AM EDT. 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: Apr 20, 2007, 3:43 AM EDT (07:43 UTC)
In effect from: Apr 20, 2007, 9:40 AM EDT
Expired: Apr 20, 2007, 6:00 PM EDT
In force: 8 hr
Issued by: NWS Jacksonville, FL

Counties Gilchrist County, FL, Suwannee County, FL, Brantley County, GA, Clinch County, GA, Echols County, GA

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 7.7 hours before the alert went out and 94 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1686 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 256 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 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 Apr 20, 3:20 AM EDT, 23 minutes earlier.

Area forecast discussion, Apr 20, 3:20 AM EDT, 23 minutes before

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Hazardous weather outlook, Apr 19, 10:55 AM EDT, 16 hours 48 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
Apr 20, 3:41 AM EDT	Lake Wind Advisory	JAX	Flagler, Nassau	16 hr
Apr 20, 3:51 AM EDT	Special Marine Warning	JAX		114 min
Apr 20, 10:54 AM EDT	Coastal Flood Statement	JAX	Flagler, Nassau	17 hr
Apr 20, 2:53 PM EDT	Fire Weather Watch	JAX	Baker, Gilchrist, Suwannee, Union	14 hr
Apr 20, 2:53 PM EDT	Fire Weather Watch	JAX	Baker, Bradford, Gilchrist, Suwannee, Union	38 hr
Apr 20, 5:01 PM EDT	Dense Smoke Advisory	JAX		16 hr
Apr 20, 5:55 PM EDT	High Surf Advisory	JAX	Flagler, Nassau	19 hr

Nearby

Red Flag Warnings in Georgia, 2007 Red Flag Warnings in Florida, 2007 Every red flag warning in 2007

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.