FNUS52 KKEY 210907
FWFKEY

Fire Weather Planning Forecast for the Florida Keys
National Weather Service Key West FL
507 AM EDT Tue Apr 21 2026

...DISPERSION INDICES ABOVE 75 EXPECTED THIS AFTERNOON AND
WEDNESDAY AFTERNOON...

.Discussion...
A frontal boundary will continue to slowly drift southward today.
High pressure will slowly build in behind the front resulting in
an increased pressure gradient. This will result in fresh to
strong northeast to east breezes continuing through at least
Wednesday. Chances of rain are expected today due to ample
moisture across the area. Near nil rain chances are expected
tonight and Wednesday as drier air filters in. Min RH values today
will be in the upper 50s percent and mid 50s percent on Wednesday
with max RH only recovering into the mid 70s percent overnight.
This will lead to high dispersion indices both today and
Wednesday.

FLZ076>078-220115-
Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys-
Including the cities of Key Largo, Marathon, and Key West
507 AM EDT Tue Apr 21 2026

                      Today        Tonight      Wed

Cloud Cover           Pcldy        Mclear       Pcldy
Chance Precip (%)     30           0            0
Chance of Thunder (%) 0            0            0
Weather Type          Showers      None         None
Max/Min Temp          80           71           80
Min/Max RH %          59           74           56
Wind 20ft AM (mph)    NE 15 G23                 E 15
Wind 20ft PM (mph)    NE 17        NE 17        E 13
Precip Duration       2
Precip Begin          6 AM
Precip End            6 PM
Precip Amount         0.12         0.00         0.00
Mixing Hgt(ft-agl)    3700         3100         4600
Transport Wnd (mph)   NE 32        E 26         E 20
Dispersion Index      103          42           80
Max LVORI             4            3            2

Remarks...None.

$$

.FORECAST FOR DAYS 3 THROUGH 7...
.WEDNESDAY NIGHT...Mostly cloudy with a slight chance of showers.
Lows in the lower 70s. East winds around 10 mph.
.THURSDAY...Mostly cloudy with a chance of showers. Highs in the
lower 80s. East winds around 10 mph.
.THURSDAY NIGHT...Mostly cloudy with a chance of showers and a
slight chance of thunderstorms. Lows in the lower 70s. East winds
around 10 mph.
.FRIDAY...Mostly sunny with a chance of showers and a slight
chance of thunderstorms. Highs in the lower 80s. East winds
around 10 mph.
.FRIDAY NIGHT...Partly cloudy with a slight chance of showers.
Lows in the mid 70s. East winds around 10 mph.
.SATURDAY...Sunny. Highs in the lower 80s. East winds around
5 mph.
.SATURDAY NIGHT...Mostly clear. Lows in the mid 70s. East winds
around 5 mph.
.SUNDAY...Sunny. Highs in the lower 80s. East winds around 5 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the mid 70s. East winds
around 5 mph.
.MONDAY...Sunny. Highs in the lower 80s. Southeast winds around
5 mph.

$$

MJV