Alert archive / Florida / Red Flag Warnings in 2012

Red Flag Warning 3, NWS Jacksonville, FL

January 13, 2012Nassau County, Florida

NWS Jacksonville, FL issued this red flag warning at Jan 13, 2012, 9:45 AM EST for Nassau County, Florida. 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
Jan 13, 2012, 9:45 AM EST (14:45 UTC)
Expired
Jan 13, 2012, 5:00 PM EST
In force
7 hr
Issued by
NWS Jacksonville, FL

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 14:49 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

Jacksonville, FL (KJAX), launched 12:00Z, 2.8 hours before the alert went out and 14 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-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2012-01-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2012-01-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -230 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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
2044 m above ground
0-6 km bulk shear
78 kt
0-1 km storm-relative helicity
-230 m²/s²
0-3 km storm-relative helicity
-104 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.

926 
WWUS82 KJAX 131445
RFWJAX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE JACKSONVILLE FL
945 AM EST FRI JAN 13 2012

FLZ024-025-032-033-132200-
/O.NEW.KJAX.FW.W.0003.120113T1445Z-120113T2200Z/
NASSAU-DUVAL-CLAY-ST JOHNS-
945 AM EST FRI JAN 13 2012

...RED FLAG WARNING IN EFFECT UNTIL 5 PM EST THIS AFTERNOON FOR
GUSTY WINDS AND LOW HUMIDITY FOR PARTS OF NORTHEAST FLORIDA...

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A RED
FLAG WARNING...WHICH IS IN EFFECT UNTIL 5 PM EST THIS AFTERNOON. 

* AFFECTED AREA...IN FLORIDA...FIRE WEATHER ZONES 024...025... 
  032 AND 033. 

* WIND...WINDS AROUND 15 MPH ARE EXPECTED.

* HUMIDITY...RH VALUES AT 25 TO 35 PERCENT ARE EXPECTED.

* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY. 
  OUTDOOR BURNING IS NOT RECOMMENDED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

$$


HTTP://WEATHER.GOV/JAX
1 follow-up statement
621 
WWUS82 KJAX 132205
RFWJAX

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE JACKSONVILLE FL
505 PM EST FRI JAN 13 2012

FLZ024-025-032-033-132315-
/O.EXP.KJAX.FW.W.0003.000000T0000Z-120113T2200Z/
NASSAU-DUVAL-CLAY-ST JOHNS-
505 PM EST FRI JAN 13 2012

...RED FLAG WARNING HAS EXPIRED FOR GUSTY WINDS AND LOW HUMIDITY
FOR PORTIONS OF COASTAL NORTHEAST FLORIDA...

RELATIVE HUMIDITIES WILL CONTINUE TO RISE ABOVE CRITICAL LEVELS
THROUGH THE EVENING HOURS.

$$


HTTP://WEATHER.GOV/JAX

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 13, 3:32 AM ESTFreeze WatchJAXBaker, Bradford, Gilchrist, Nassau, Suwannee, Union11 hr
Jan 13, 2:35 PM ESTFreeze WarningJAXBaker, Bradford, Nassau, Union18 hr
Jan 13, 2:35 PM ESTHard Freeze WarningJAXGilchrist, Suwannee18 hr

Nearby

Red Flag Warnings in Florida, 2012Every red flag warning in 2012

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.