FXUS65 KTWC 010950

Area Forecast Discussion
National Weather Service Tucson AZ
250 AM MST Fri Dec 1 2023

.SYNOPSIS...A slow moving weather system will bring scattered
rain and mountain snow showers to the area into tonight. This
will be followed by cold overnight temperatures this weekend into
Monday. It will be dry next week and becoming much warmer by


.DISCUSSION...Scattered light valley rain and mountain snow
showers since late last night have been occurring mostly north of
a Sells to Tucson to Clifton line. Rainfall amounts have mostly
been less than a tenth of an inch with localized amounts up to a
quarter of an inch across parts of Pinal county. No snow reports
have been called into the office as of this writing but some of
the mountain cameras show some minor accumulation. Scattered
showers will continue today into tonight before ending from west
to east. Maintained the Winter Weather Advisory above 6500 ft
until early Saturday morning for the mountains of Graham and
Greenlee counties. Depending on how fast clouds clear up tonight
into Saturday morning, could see some patchy fog develop,
especially across eastern Pinal county.

Colder air mass settles in over the weekend with cold overnight
lows with Sunday morning the coldest. As the previous discussion
mentioned, it still appears that a few of the outlying areas of
the Tucson metro and the colder areas in southeast Pinal county
may approach freezing Sunday morning.

High pressure next week will bring warmer temperatures with highs
Tue thru Fri running, depending on location, 6 to 12 degrees
above early December climo.


.AVIATION...Valid through 02/12z.
BKN-SCT 7-10K ft MSL with BKN-OVC layers ABV. ISOLD to SCT -SHRA
and mountain SHSN. MTNS partially to mostly obscured at times in
clouds and also due to SHRA/SHSN AFT until about 02/04Z. Conds
imprvg from W-E during 2nd half of valid pd. W-SW SFC winds 5-12
kts then increasing to 10-17 kts aft 01/18Z. Aviation discussion
not updated for TAF amendments.


.FIRE WEATHER...A slow moving storm system will bring scattered rain
and mountain snow showers into tonight. Snow will be confined to
elevations above about 6,000 ft. Dry Saturday onward with cold
overnight temperatures through Monday then becoming much warmer
than normal by the middle of next week. Winds generally light,
less than 15 mph sustained, with a bit of afternoon gustiness at
times well into next week.


 Winter Weather Advisory until 5 AM MST Saturday for AZZ510-511.



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NWS TWC Office Area Forecast Discussion