


Spot Forecast
Issued by NWS San Francisco Bay Area, CA
Issued by NWS San Francisco Bay Area, CA
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