927
FNUS76 KMTR 130301
FWSMTR

Spot Forecast for 10132025 Winter Storm...San Bruno Fire Department
National Weather Service San Francisco CA
801 PM PDT Sun Oct 12 2025

Forecast is based on forecast start time of 2000 PDT on October 12.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...An approaching low pressure system will bring rain
and the chance for thunderstorms to the area of interest. On
Monday, winds will initially build from the southwest in the
morning, turning to the northwest late in the afternoon as the
main rain band passes the forecast location. Estimated time of the
wind shift is around 2 to 4 PM. Wind speeds in the lower
elevations top out around 16 mph gusting to 22 mph, but the
ridgelines will be significantly breezier with isolated gusts of
up to 40 mph possible in favored locations. Rain showers and
thunderstorm chances will continue through Tuesday, with warmer
and drier conditions beginning on Wednesday.

.REST OF TONIGHT...

Sky/weather.........Mostly cloudy. Chance of rain showers
                    overnight.
Min temperature.....54-58.
Max humidity........83-87 percent.
Surface winds (mph).Northwest winds 11 to 20 mph with gusts to
                    around 28 mph. At the ridgelines, northwest
                    winds of 20 to 25 mph.
Chance of pcpn......50 percent.
Chance of thunder...0 percent.
Mixing height.......600 ft AGL.
Transport winds.....Northwest around 22 mph.
Marine layer........None.
SUNRISE.............

.COLUMBUS DAY...

Sky/weather.........Partly sunny then becoming cloudy. Slight
                    chance of thunderstorms in the morning. Rain
                    showers through the day. Chance of
                    thunderstorms in the afternoon.
Max temperature.....60-64.
Min humidity........75-79 percent.
Surface winds (mph).Southwest winds 8 to 12 mph in the morning,
                    turning northwest and increasing to 12 to 16 mph
                    in the afternoon with gusts to 22 mph. Along the
                    ridgelines, southwest winds of 15 to 25 mph in the
                    morning, turning northwest and increasing to
                    25 to 35 mph with gusts to 40 mph in the afternoon.
Chance of pcpn......100 percent.
Chance of thunder...26 percent.
Mixing height.......1700 ft AGL.
Transport winds.....West around 16 mph.
Marine layer........None.
SUNSET..............

.MONDAY NIGHT...

Sky/weather.........Mostly cloudy. Rain showers and slight chance
                    of thunderstorms in the evening, then rain
                    showers likely overnight.
Min temperature.....49-53.
Max humidity........85-89 percent.
Surface winds (mph).South winds 6 to 9 mph.
Chance of pcpn......80 percent.
Chance of thunder...18 percent.
Mixing height.......500 ft AGL.
Transport winds.....Southwest around 10 mph.
Marine layer........None.
SUNRISE.............

.TUESDAY...

Sky/weather.........Mostly cloudy. Rain showers likely in the
                    morning, then chance of rain showers in the
                    afternoon.
Max temperature.....59-63.
Min humidity........68-72 percent.
Surface winds (mph).Southeast winds 6 to 8 mph shifting to the
                    northwest 6 to 9 mph in the afternoon.
Chance of pcpn......60 percent.
Chance of thunder...10 percent.
Mixing height.......3300 ft AGL.
Transport winds.....Southeast around 9 mph.
Marine layer........None.
SUNSET..............

$$
Forecaster...D_HOANG
Requested by...Ari Delay
Type of request...OTHER
.TAG 2523487.0/MTR
.DELDT 10/12/25
.FormatterVersion 2.0.0
.EMAIL adelay@sanbruno.ca.gov