911
FNUS75 KTWC 190034
FWSTWC

Spot Forecast for Catalina Piles...USFS
National Weather Service Tucson AZ
534 PM MST Tue Nov 18 2025

Forecast is based on ignition time of 0800 MST on November 19.

.DISCUSSION...A storm system will bring rain showers and snow
showers today and exiting the area by middle of Thursday. Today,
high chances for rain showers throughout the day with embedded
thunderstorms during the early afternoon to late evening. This
will boost rainfall amounts and bring gusty erratic winds. By the
end of the day, rain showers will transition into snow showers,
lasting throughout Wednesday night into Thursday morning. The bulk
of the snow fall will occur during this overnight period.
Forecasted snow accumulations by Thursday morning will range 2 to
5 inches on the ridge tops around the project area. Winds will be
south-southwesterly with gusts up to 25 mph today becoming more
westerly tomorrow with speeds less than 15 mph.


.WEDNESDAY...

Sky/weather.........Mostly cloudy. Chance of rain showers
                    and snow showers. Slight chance for thunderstorms.
Chance of pcpn......20 percent increasing to 50 percent late in the
                    afternoon.
Max temperature.....37-41 degrees.
Min humidity........85-90 percent.
20-foot winds.......South-southwest winds 8 to 13 mph with gusts
                    up to 25 mph. Gusty and erratic winds
                    expected near any thunderstorm.
Mixing height.......200 ft AGL.
Transport winds.....South 11 to 16 knots.

TIME (MST)      8 AM      11 AM     2 PM      5 PM
Sky (%).........54        77        84        72
Weather cov.....S CHC     S CHC     CHANCE    CHANCE
Weather type....RNSHWR    RNSHWR    RNSHWR    RNSN
Tstm cov........S CHC     S CHC     S CHC     S CHC
CWR.............20        20        50        50
Temp............37        38        39        36
RH..............86        81        85        95
20 FT wind......S 10G14   SSW 9G20  SSW 8G22  S 6G15
Mix hgt (ft)....BLW100    BLW100    BLW100    BLW100
Transport wind..S 11      S 15      S 13      S 11

.WEDNESDAY NIGHT...

Sky/weather.........Mostly cloudy. Chance of rain showers in the
                    evening. Snow showers through the night.
Chance of pcpn......50 percent increasing to 80 percent late
                    overnight.
Min temperature.....28-31 degrees.
Max humidity........97-100 percent.
20-foot winds.......South winds 8 to 15 mph.
Mixing height.......100 ft AGL.
Transport winds.....South 9 to 14 knots.

TIME (MST)      6 PM      9 PM      MIDNGT    3 AM
Sky (%).........72        82        90        90
Weather cov.....CHANCE    LIKELY    DEFNTE    DEFNTE
Weather type....RNSHWR    SNSHWR    SNSHWR    SNSHWR
Tstm cov........S CHC     CHANCE    CHANCE    S CHC
CWR.............50        70        80        80
Temp............37        36        36        34
RH..............100       94        91        96
20 FT wind......S 6G10    S 7G10    S 9G13    SW 11G14
Mix hgt (ft)....BLW100    BLW100    BLW100    BLW100
Transport wind..S 9       S 11      S 13      S 14

.THURSDAY...

Sky/weather.........Partly cloudy. Snow showers likely in the early
                    morning.
Chance of pcpn......60 percent decreasing to 10 percent.
Max temperature.....30-33 degrees.
Min humidity........90-95 percent.
20-foot winds.......South- southwest wind in the morning at 6 to
                    12 mph becoming west winds 5 to 10 mph after noon.
Mixing height.......100 ft AGL.
Transport winds.....Southwest 7 to 12 knots.

TIME (MST)      6 AM      9 AM      NOON      3 PM
Sky (%).........87        74        72        55
Weather cov.....LIKELY    LIKELY    CHANCE    CHANCE
Weather type....SNSHWR    SNSHWR    SNSHWR    SNSHWR
Tstm cov........S CHC     S CHC
CWR.............60        60        30        30
Temp............31        30        29        30
RH..............96        95        99        100
20 FT wind......SW 11G14  SW 9G13   SW 8G12   W 6G10
Mix hgt (ft)....BLW100    BLW100    BLW100    BLW100
Transport wind..S 12      SW 11     SW 11     W 11

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Partly cloudy. Slight chance of snow showers. Lows in the upper
20s. Highs in the upper 30s. South winds around 6 mph.
.SATURDAY...
Mostly cloudy. Chance of snow showers. Lows in the mid 30s. Highs
around 40. Southeast winds around 7 mph.
.SUNDAY...
Mostly cloudy. Chance of snow showers and slight chance of
thunderstorms. Lows in the mid 30s. Highs in the mid 30s. South
winds around 6 mph.

$$
Forecaster...STRONGMAN
Requested by...Chad Rice
Type of request...PRESCRIBED
.TAG 2526339.0/TWC
.DELDT 11/18/25
.FormatterVersion 2.0.0
.EMAIL chad.rice@usda.gov

Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson