638
FNUS75 KTWC 180056
FWSTWC

Spot Forecast for Catalina Piles...usfs
National Weather Service Tucson AZ
556 PM MST Mon Nov 17 2025

Forecast is based on ignition time of 0800 MST on November 18.

.DISCUSSION...Several rounds of storm systems will be impacting
the region today and through most of the work week. Rain shower
and mountain snow chances are low for today, around 20 percent,
but those chances will be increasing tonight and tomorrow. Snow
levels will drop down to 8000 feet by Wednesday morning and
bottoming out to 7500 feet by the evening. There is a 57 percent
at least 2 inches of snow totals in a 24 window from Wednesday
through Thursday morning. Southerly breezes expected today and
little less for Wednesday. Slight chances for afternoon
thunderstorms on Wednesday which can increase rainfall amounts and
snow amounts briefly.


***Please continue to send obs to our email. Much appreciated!***

.TUESDAY...

Sky/weather.........Mostly cloudy. Slight chance of rain showers
                    early in the afternoon. Slight chance of snow
                    showers and rain showers late in the afternoon.
Chance of pcpn......10 percent increasing to 20 percent late in the
                    afternoon.
Max temperature.....42-45 degrees.
Min humidity........70-73 percent.
20-foot winds.......South winds 12 to 15 mph in the morning, becoming
                    14 to 18 mph with gusts up to 25 to 30 mph in the
                    afternoon.
Mixing height.......200 ft AGL.
Transport winds.....South 12 to 18 knots.

TIME (MST)      8 AM      11 AM     2 PM      5 PM
Sky (%).........77        77        84        50
Weather cov.....                    S CHC     S CHC
Weather type....NONE      NONE      RNSHWR    RNSN
Tstm cov........
CWR.............10        10        20        20
Temp............38        40        41        39
RH..............79        71        76        78
20 FT wind......S 15G20   S 15G21   S 15G21   S 11G16
Mix hgt (ft)....BLW100    BLW100    200       BLW100
Transport wind..S 16      S 18      S 17      S 12

.TUESDAY NIGHT...

Sky/weather.........Mostly cloudy. Slight chance of rain
                    showers and snow showers late in the
                    the overnight
Chance of pcpn......20 percent increasing to 50 percent.
Min temperature.....36-39 degrees.
Max humidity........86-89 percent.
20-foot winds.......South winds 10 to 15 mph with gusts
                    up to 25 mph.
Mixing height.......100 ft AGL.
Transport winds.....South around 12 knots.

TIME (MST)      6 PM      9 PM      MIDNGT    3 AM
Sky (%).........62        55        55        60
Weather cov.....S CHC               CHANCE    CHANCE
Weather type....RNSHWR    NONE      SNSHWR    SNSHWR
Tstm cov........
CWR.............20        10        30        30
Temp............40        38        38        38
RH..............81        80        81        85
20 FT wind......S 11G24   S 11G20   S 11G18   S 11G15
Mix hgt (ft)....BLW100    BLW100    BLW100    BLW100
Transport wind..S 12      S 12      S 12      S 12

.WEDNESDAY...

Sky/weather.........Mostly cloudy. Chance of snow showers
                    throughout the day. Slight chance of
                    thunderstorms late in the afternoon.
Chance of pcpn......50 percent increasing to 60 percent late in the
                    morning.
Max temperature.....38-41 degrees.
Min humidity........73-76 percent.
20-foot winds.......South winds 6 to 11 mph shifting to the
                    southwest 8 to 12 mph late in the afternoon.
                    Gusty and erratic winds expected near
                    thunderstorms late in the afternoon.
Mixing height.......900 ft AGL.
Transport winds.....South 11 to 16 knots shifting to the west 7 to
                    10 knots late in the afternoon.

TIME (MST)      6 AM      9 AM      NOON      3 PM
Sky (%).........66        71        77        82
Weather cov.....CHANCE    CHANCE    LIKELY    LIKELY
Weather type....SNSHWR    SNSHWR    SNSHWR    SNSHWR
Tstm cov........                              S CHC
CWR.............50        50        60        60
Temp............37        38        38        36
RH..............86        77        78        94
20 FT wind......S 11G14   S 10G14   S 9G14    SW 7G13
Mix hgt (ft)....BLW100    300       600       BLW100
Transport wind..S 12      S 13      S 14      SW 10

.FORECAST DAYS 3 THROUGH 5...
.THURSDAY...
Mostly cloudy. Snow showers likely and slight chance of
thunderstorms. Lows in the upper 20s. Highs in the lower 30s.
Southwest winds around 6 mph.
.FRIDAY...
Partly cloudy. Slight chance of snow showers. Lows around 30.
Highs in the upper 30s. South winds around 6 mph.
.SATURDAY...
Partly cloudy. Chance of snow showers. Lows in the mid 30s. Highs
in the lower 40s. Northeast winds around 6 mph.

$$
Forecaster...STRONGMAN
Requested by...chad rice
Type of request...PRESCRIBED
.TAG 2526200.0/TWC
.DELDT 11/17/25
.FormatterVersion 2.0.0
.EMAIL chad.rice@usda.gov

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