581
FNUS52 KKEY 200805
FWFKEY
FIRE WEATHER PLANNING FORECAST FOR THE FLORIDA KEYS
NATIONAL WEATHER SERVICE KEY WEST FL
405 AM EDT THU AUG 20 2026
DISCUSSION
WARMER THAN NORMAL WEATHER CONTINUES WHILE RAIN CHANCES SLOWLY
INCREASE IN THE COMING DAYS. TEMPERATURES IN THE LOWER 90S ARE
LIKELY ACROSS THE ISLAND CHAIN WHILE DEW POINTS STAY IN THE MID TO
UPPER 70S. RELATIVE HUMIDITY VALUES ARE EXPECTED TO RECOVER INTO
THE MID 80S DURING THE OVERNIGHT HOURS, BUT MIN RH VALUES WILL BE
ABLE TO DROP INTO THE LOWER 60S DURING THE AFTERNOON HOURS. IN
ADDITION, COLLAPSING WINDS WITH A LIGHT AND VARIABLE FLOW PATTERN
SUGGESTS THAT DISPERSION INDICES WILL BE VERY LOW THROUGH THE
REMAINDER OF THE WEEK.
FLZ076>078-202315-
MONROE UPPER KEYS-MONROE MIDDLE KEYS-MONROE LOWER KEYS-
INCLUDING THE CITIES OF KEY LARGO, MARATHON, AND KEY WEST
405 AM EDT THU AUG 20 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
CHANCE PRECIP (%) 10 0 0
CHANCE OF THUNDER (%) 10 0 0
WEATHER TYPE TSTMS NONE NONE
MAX/MIN TEMP 92 82 91
MIN/MAX RH % 64 84 63
WIND 20FT AM (MPH) LGT/VAR S 5
WIND 20FT PM (MPH) LGT/VAR LGT/VAR LGT/VAR
PRECIP DURATION 1
PRECIP BEGIN 8 AM
PRECIP END 6 PM
PRECIP AMOUNT 0.03 0.00 0.00
MIXING HGT(FT-AGL) 3100 1700 3000
TRANSPORT WND (MPH) W 7 E 7 SE 6
DISPERSION INDEX 21 7 21
MAX LVORI 4 4 4
REMARKS...NONE.
FORECAST FOR DAYS 3 THROUGH 7
FRIDAY NIGHT
PARTLY CLOUDY. LOWS IN THE LOWER 80S. SOUTH WINDS
AROUND 5 MPH.
SATURDAY
SUNNY. HIGHS IN THE LOWER 90S. SOUTHEAST WINDS AROUND
5 MPH.
SATURDAY NIGHT
MOSTLY CLEAR. LOWS IN THE LOWER 80S. SOUTHEAST
WINDS AROUND 5 MPH.
SUNDAY
SUNNY WITH A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. HIGHS AROUND 90. SOUTHEAST WINDS AROUND 5 MPH.
SUNDAY NIGHT
PARTLY CLOUDY WITH A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 80S. EAST WINDS AROUND 5 MPH.
MONDAY
SUNNY WITH A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. HIGHS AROUND 90. SOUTHEAST WINDS AROUND 5 MPH.
MONDAY NIGHT
MOSTLY CLEAR WITH A CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 80S. EAST WINDS AROUND 5 MPH.
TUESDAY
SUNNY WITH A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. HIGHS AROUND 90. EAST WINDS AROUND 5 MPH.
TUESDAY NIGHT
PARTLY CLOUDY WITH A CHANCE OF SHOWERS AND
THUNDERSTORMS. LOWS IN THE LOWER 80S. EAST WINDS AROUND 10 MPH.
WEDNESDAY
MOSTLY SUNNY WITH A SLIGHT CHANCE OF SHOWERS AND
THUNDERSTORMS. HIGHS AROUND 90. EAST WINDS AROUND 5 MPH.
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