Alert archive / Florida / Red Flag Warnings in 2011

Red Flag Warning 11, NWS Miami, FL

March 18, 2011Broward County, Miami-Dade County, Florida

NWS Miami, FL issued this red flag warning at Mar 18, 2011, 11:22 AM EDT for Broward County, Miami-Dade County, Florida. It was in force for 9 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
Mar 18, 2011, 11:22 AM EDT (15:22 UTC)
Expired
Mar 18, 2011, 8:00 PM EDT
In force
9 hr
Issued by
NWS Miami, FL

Counties Broward County, FL, Miami-Dade County, FL

The radar

The Miami radar (KAMX), 31 km from the middle of the area, began a volume at 15:19 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

Miami, FL (KMFL), launched 12:00Z, 3.4 hours before the alert went out and 20 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, Miami, FL at 12:00Z on 2011-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 86 joules per kilogram.LCLLFCEL10008507005003002001001 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, Miami, FL at 12:00Z on 2011-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -26 square meters per square second.19395878Sfc1 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
86 J/kg
Mixed-layer CIN
-193 J/kg
Mixed-layer LCL
867 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
-26 m²/s²
0-3 km storm-relative helicity
-37 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.

470 
WWUS82 KMFL 181522
RFWMFL

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE MIAMI FL
1122 AM EDT FRI MAR 18 2011

...RED FLAG WARNING IN EFFECT FOR METRO AND INLAND SECTIONS OF
BROWARD AND MIAMI-DADE COUNTIES FOR RELATIVE HUMIDITY VALUES BELOW
35 PERCENT AND WINDS ABOVE 15 MPH UNTIL 8 PM EDT...



FLZ071>074-190000-
/O.NEW.KMFL.FW.W.0011.110318T1522Z-110319T0000Z/
INLAND BROWARD-METRO BROWARD-INLAND MIAMI DADE-METRO MIAMI DADE-
1122 AM EDT FRI MAR 18 2011

...RED FLAG WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING FOR
HUMIDITY VALUES BELOW 35 PERCENT AND WINDS ABOVE 15 MPH FOR METRO
AND INLAND SECTIONS OF BROWARD AND MIAMI-DADE COUNTIES...

A VERY DRY AIRMASS WILL CONTINUE TO MIX DOWN TO THE SURFACE
THROUGH THIS AFTERNOON. IN ADDITION TO THIS VERY DRY AIRMASS WHERE
SOME LOCATIONS WILL EXPERIENCE RELATIVE HUMIDITY VALUES OF AROUND 20
PERCENT AND POSSIBLY LOWER, WIND SPEEDS WILL ALSO BE AROUND 15 MPH
WITH GUSTS OVER 20 MPH. ALSO IN ADDITION, THE ENERGY RELEASE
COMPONENT FOR BROWARD COUNTY IS FORECAST TO BE AROUND 35, BUT A
SLIGHTLY LOWER VALUE OF NEAR 30 IS EXPECTED IN MIAMI-DADE COUNTY.
ALL OF THESE CONDITIONS COMBINED WARRANT A RED FLAG WARNING
THIS AFTERNOON FOR THE METROPOLITAN AND INLAND SECTIONS OF
THE AFOREMENTIONED COUNTIES INTO EARLY EVENING. CONDITIONS WILL
GRADUALLY BECOME MORE MOIST THROUGH THE LATE AFTERNOON AS ATLANTIC
MOISTURE MOVES IN THE THE NORTHEAST WINDS.


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.

&&

$$
1 follow-up statement
250 
WWUS82 KMFL 182351
RFWMFL

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE MIAMI FL
751 PM EDT FRI MAR 18 2011

...THE RED FLAG WARNING WILL BE ALLOWED TO EXPIRE AT 8 PM...


FLZ071>074-190100-
/O.EXP.KMFL.FW.W.0011.000000T0000Z-110319T0000Z/
INLAND BROWARD-METRO BROWARD-INLAND MIAMI DADE-METRO MIAMI DADE-
751 PM EDT FRI MAR 18 2011

...RED FLAG WARNING WILL EXPIRE AT 8 PM EDT THIS EVENING...

* AFFECTED AREA...FIRE WEATHER ZONES 071...072...073 AND 074. 

* WIND...WIND SPEEDS HAVE DECREASED TO LESS THAN 15 MPH. 

* HUMIDITY...RELATIVE HUMIDITY VALUES HAVE INCREASED TO ABOVE 35%
  AND WILL CONTINUE TO INCREASE THROUGH THIS EVENING.



$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 18, 2:21 AM EDTDense Fog AdvisoryMFLBroward, Collier, Glades, Hendry, Miami-Dade, Monroe and 1 more6 hr

Nearby

Red Flag Warnings in Florida, 2011Every red flag warning in 2011

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.