Alert archive / Florida / Red Flag Warnings in 2007

Red Flag Warning 45, NWS Miami, FL

April 20, 20075 counties in Florida

NWS Miami, FL issued this red flag warning at Apr 20, 2007, 5:03 AM EDT for 5 counties in Florida. It took effect at Apr 20, 2007, 1:08 PM EDT. It was in force for 6 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, 5:03 AM EDT (09:03 UTC)
In effect from: Apr 20, 2007, 1:08 PM EDT
Expired: Apr 20, 2007, 7:00 PM EDT
In force: 6 hr
Issued by: NWS Miami, FL

Counties Broward County, FL, Collier County, FL, Miami-Dade County, FL, Monroe County, FL, Palm Beach County, FL

The radar

The Miami radar (KAMX), 55 km from the middle of the area, began a volume at 09:00 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 00:00Z, 9.1 hours before the alert went out and 50 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: 1805 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 29 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 
WWUS82 KMFL 200903
RFWMFL

RED FLAG WARNING
NATIONAL WEATHER SERVICE MIAMI FL
503 AM EDT FRI APR 20 2007

...RED FLAG WARNING FRIDAY AFTERNOON FOR 4 OR MORE HOURS OF
RELATIVE HUMIDITY BELOW 35 PERCENT FOR GLADES...HENDRY AND EASTERN
COLLIER COUNTIES...

FLZ063-066-070-201715-
/O.UPG.KMFL.FW.A.0025.070420T1700Z-070420T2300Z/
/O.NEW.KMFL.FW.W.0045.070420T1700Z-070420T2300Z/
GLADES-HENDRY-EASTERN COLLIER-
503 AM EDT FRI APR 20 2007

...RED FLAG WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM
EDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 PM EDT
THIS EVENING.

A DRY AIRMASS WILL BE IN PLACE ACROSS THE INTERIOR PORTION OF
SOUTH FLORIDA THIS AFTERNOON...AND RELATIVE HUMIDITIES CAN BE
EXPECTED TO FALL BELOW 35 PERCENT FOR 4 OR MORE CONSECUTIVE HOURS
FROM FRIDAY AFTERNOON INTO EARLY FRIDAY EVENING.

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.

$$

70/DD

2 follow-up statements

000 
WWUS82 KMFL 201708
RFWMFL

RED FLAG WARNING
NATIONAL WEATHER SERVICE MIAMI FL
108 PM EDT FRI APR 20 2007

...RED FLAG WARNING FRIDAY AFTERNOON FOR 4 OR MORE HOURS OF
RELATIVE HUMIDITY BELOW 35 PERCENT FOR GLADES...HENDRY AND
EASTERN COLLIER COUNTIES...

FLZ067>069-071>075-202300-
/O.EXB.KMFL.FW.W.0045.070420T1800Z-070420T2300Z/
PALM BEACH WESTERN-PALM BEACH EASTERN-WESTERN COLLIER-
WESTERN BROWARD-BROWARD METROPOLITAN-WESTERN DADE-
DADE METROPOLITAN-MAINLAND MONROE-
108 PM EDT FRI APR 20 2007

...RED FLAG WARNING IN EFFECT UNTIL 7 PM EDT THIS EVENING...

THE NATIONAL WEATHER SERVICE IN MIAMI HAS ISSUED A RED FLAG
WARNING...WHICH IS IN EFFECT UNTIL 7 PM EDT THIS EVENING. 

A DRY AIRMASS WILL BE IN PLACE ACROSS MUCH OF SOUTH FLORIDA THIS
AFTERNOON...AND RELATIVE HUMIDITIES CAN BE EXPECTED TO FALL BELOW
35 PERCENT FOR 4 OR MORE CONSECUTIVE HOURS FROM EARLY AFTERNOON
INTO EARLY FRIDAY EVENING. SURFACE WINDS ARE SHIFTING TO THE
NORTHEAST AND EAST THIS AFTERNOON...HOWEVER INLAND PARTS OF THE
EAST COAST METRO ZONES...MAINLY AREAS ALONG AND WEST OF THE
FLORIDA TURNPIKE WILL SEE RELATIVE HUMIDITIES DROP BELOW CRITICAL
LEVELS THIS AFTERNOON. EAST OF THE TURNPIKE...RELATIVE HUMIDITIES
MAY DROP TO NEAR 35 PERCENT FOR A FEW HOURS BEFORE LOW-LEVEL
MOISTURE INCREASES FROM THE EAST.

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.

$$

FLZ063-066-070-202300-
/O.EXT.KMFL.FW.W.0045.070420T1800Z-070420T2300Z/
GLADES-HENDRY-EASTERN COLLIER-
108 PM EDT FRI APR 20 2007

...RED FLAG WARNING NOW IN EFFECT UNTIL 7 PM EDT THIS EVENING...

THE RED FLAG WARNING IS NOW IN EFFECT UNTIL 7 PM EDT THIS
EVENING. 

A DRY AIRMASS WILL BE IN PLACE ACROSS THE INTERIOR PORTION OF
SOUTH FLORIDA THROUGH THE AFTERNOON...AND RELATIVE HUMIDITIES CAN BE
EXPECTED TO FALL BELOW 35 PERCENT FOR 4 OR MORE CONSECUTIVE HOURS
FROM EARLY AFTERNOON INTO EARLY EARLY EVENING. IN FACT...WITH
TEMPERATURES WARMING THROUGH THE 80S AND DEWPOINTS DROPPING INTO
THE 40S...AN EXTENDED PERIOD OF RELATIVE HUMIDITIES BELOW 25
PERCENT MAY OCCUR.

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.

$$

STRASSBERG

000 
WWUS82 KMFL 202300
RFWMFL

RED FLAG WARNING
NATIONAL WEATHER SERVICE MIAMI FL
700 PM EDT FRI APR 20 2007

...THE RED FLAG WARNING FOR ALL OF SOUTH FLORIDA WILL EXPIRE AT 7 PM EDT
THIS EVENING...

FLZ063-066>075-210000-
/O.EXP.KMFL.FW.W.0045.000000T0000Z-070420T2300Z/
GLADES-HENDRY-PALM BEACH WESTERN-PALM BEACH EASTERN-
WESTERN COLLIER-EASTERN COLLIER-WESTERN BROWARD-
BROWARD METROPOLITAN-WESTERN DADE-DADE METROPOLITAN-
MAINLAND MONROE-
700 PM EDT FRI APR 20 2007

...RED FLAG WARNING WILL EXPIRE AT 7 PM EDT THIS EVENING...

THE RED FLAG WARNING WILL EXPIRE AT 7 PM THIS EVENING, HOWEVER
SOME AREAS ESPECIALLY ACROSS THE INTERIOR SECTIONS OF SOUTH
FLORIDA WILL CONTINUE TO EXPERIENCE RELATIVE HUMIDITIES BELOW 35%
FOR ANOTHER HOUR OR TWO AS TEMPERATURES COOL.


$$

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.