Alert archive / Florida / Red Flag Warnings in 2007

Red Flag Warning 39, NWS Mobile, AL

April 13, 2007Walton County, Florida

NWS Mobile, AL issued this red flag warning at Apr 13, 2007, 6:11 AM CDT for Walton County, Florida. It took effect at Apr 13, 2007, 11:00 AM CDT. It was in force for 7 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 13, 2007, 6:11 AM CDT (11:11 UTC)
In effect from: Apr 13, 2007, 11:00 AM CDT
Expired: Apr 13, 2007, 6:00 PM CDT
In force: 7 hr
Issued by: NWS Mobile, AL

County Walton County, FL

The radar

The Eglin Afb radar (KEVX), 25 km from the middle of the area, began a volume at 11:16 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, 11.2 hours before the alert went out and 181 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: 3345 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: -53 m²/s²
0-3 km storm-relative helicity: -96 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS84 KMOB 131111
RFWMOB

RED FLAG WARNING
NATIONAL WEATHER SERVICE MOBILE AL
611 AM CDT FRI APR 13 2007

...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 6 PM CDT 
THIS AFTERNOON OVER THE WESTERN FLORIDA PANHANDLE DUE TO CRITICALLY 
LOW RELATIVE HUMIDITY VALUES OF LESS THAN 35 PERCENT...

.DISCUSSION...DRY HIGH PRESSURE WILL MOVE ACROSS THE REGION
THROUGH TONIGHT...RESULTING IN LOW RELATIVE HUMIDITIES. A LOW
PRESSURE SYSTEM ADVANCING ACROSS THE SOUTHERN PLAINS TODAY WILL MOVE
EAST ACROSS NORTHERN AND CENTRAL ALABAMA ON SATURDAY ACCOMPANIED BY
NUMEROUS SHOWERS AND THUNDERSTORMS. DRY HIGH PRESSURE WILL BUILD INTO
THE REGION IN THE WAKE OF THIS SYSTEM EARLY NEXT WEEK.

FLZ001>006-008-131915-
/O.UPG.KMOB.FW.A.0031.070413T1600Z-070413T2300Z/
/O.NEW.KMOB.FW.W.0039.070413T1600Z-070413T2300Z/
INLAND ESCAMBIA-COASTAL ESCAMBIA-INLAND SANTA ROSA-
COASTAL SANTA ROSA-INLAND OKALOOSA-COASTAL OKALOOSA-
COASTAL WALTON-
611 AM CDT FRI APR 13 2007

...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 6 PM CDT
THIS AFTERNOON...

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM 11 AM THIS MORNING TO 6 PM CDT
THIS AFTERNOON. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. 

MINIMUM AFTERNOON RELATIVE HUMIDITY VALUES BELOW 35 PERCENT...ESPECIALLY
OVER INTERIOR PORTIONS OF THE PANHANDLE ALONG AND NORTH OF I-10 ARE
EXPECTED TODAY. DURATIONS OF RHS BELOW 35 WILL LIKELY BE 6 OR 7 HOURS
NORTH OF I-10...AND 3 TO 5 HOURS SOUTH OF I-10. ALONG THE IMMEDIATE
COASTAL AREAS...AFTERNOON RHS WILL MOST LIKELY DROP NO LOWER THAN
THE 35 TO 40 PERCENT RANGE.

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF
STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

$$

Nearby

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; radar from the NEXRAD Level II archive.