FNUS52 KKEY 130800
FWFKEY

Fire Weather Planning Forecast for the Florida Keys
National Weather Service Key West FL
400 AM EDT Thu Aug 13 2026

...DISPERSION INDICES LESS THAN 20 EXPECTED ACROSS THE FLORIDA
KEYS ON THURSDAY AFTERNOON...

.Discussion...
Low measurable rain and thunder chances will continue through
tonight, with any activity largely limited to afternoon broken
island cloud lines or convection moving off the South Florida
Mainland. A weak disturbance progressing across the Keys will
support elevated higher rain chances for Friday through Saturday
evening. Afternoon minimum RH values will remain above 60
percent. Light easterly transport winds will support low
dispersion indices through Thursday. As transport winds increase
on Friday, afternoon dispersion indices will rebound.

FLZ076>078-140215-
Monroe Upper Keys-Monroe Middle Keys-Monroe Lower Keys-
Including the cities of Key Largo, Marathon, and Key West
400 AM EDT Thu Aug 13 2026

                      Today        Tonight      Fri

Cloud Cover           Mclear       Pcldy        Mclear
Chance Precip (%)     20           20           30
Chance of Thunder (%) 20           20           30
Weather Type          Tstms        Tstms        Tstms
Max/Min Temp          91           82           92
Min/Max RH %          62           83           64
Wind 20ft AM (mph)    Lgt/Var                   E  5
Wind 20ft PM (mph)    Lgt/Var      Lgt/Var      E  6
Precip Duration       1            1            2
Precip Begin          6 AM         Continuing   Continuing
Precip End            Continuing   Continuing   Continuing
Precip Amount         0.00         0.00         0.00
Mixing Hgt(ft-agl)    3300         1900         3400
Transport Wnd (mph)   E  5         E 12         E 12
Dispersion Index      16           5            42
Max LVORI             4            5            4

Remarks...None.

$$

.FORECAST FOR DAYS 3 THROUGH 7...
.FRIDAY NIGHT...Partly cloudy with a chance of showers and
thunderstorms. Lows in the lower 80s. East winds around 10 mph.
.SATURDAY...Mostly sunny with a chance of showers and
thunderstorms. Highs around 90. East winds around 5 mph.
.SATURDAY NIGHT...Mostly clear with a slight chance of showers
and thunderstorms. Lows in the lower 80s. East winds around
5 mph.
.SUNDAY...Sunny. Highs in the lower 90s. East winds around
10 mph.
.SUNDAY NIGHT...Mostly clear. Lows in the lower 80s. East winds
around 10 mph.
.MONDAY...Sunny with a slight chance of showers and
thunderstorms. Highs in the lower 90s. East winds around 5 mph.
.MONDAY NIGHT...Mostly clear with a slight chance of showers.
Lows in the lower 80s. Northeast winds around 5 mph.
.TUESDAY...Sunny with a slight chance of showers and
thunderstorms. Highs around 90. North winds around 5 mph.
.TUESDAY NIGHT...Mostly clear with a slight chance of showers.
Lows in the lower 80s. Northeast winds around 5 mph.
.WEDNESDAY...Sunny with a slight chance of showers and
thunderstorms. Highs around 90. East winds around 5 mph.

$$