Today is still smoky for many causing unhealthy air quality across the valley and some mountain areas. It has also been warmer today with 90s in the valley. A ridge of high pressure remains over us with plenty of sunshine.
Tuesday we'll stay in the tlow-90s with light winds. Very little change from Monday.
Wednesday will see the big anticipated cooling trend start. It will be mostly sunny with highs in the 80s. The ridge of high pressure will be weakening allowing for coolin air to rush in on Thursday.
Thursday, a deep trough of low pressure will be off of the West Coast. This brings partly to mostly cloudy skies to our region on Thursday and keeps highs in the mid-to-upper 70s. Thursday will also be a bit breezy ahead of the system, before in comes in on Friday and Saturday.
Friday & Saturday are the big weather days to watch. Weather models currently do not agree on the rain outcomes.
The GFS (Ameican) model has a low pressure system making landfall south of the Bay Area on Friday. This would leave us dry on Friday. but still quite cool with highs near 70. Saturday, a second system from the northwest will come in with a cold front. Keeping us cool in the low-70s to upper-60s in the valley and providng showers to the mountains and very light to no drizzle in the valley.
The ECMWF (European) model has a low pressure system making landfall in NorCal on Friday, somewhere near Humboldt county. This would bring showers for everyone on Friday and keep us cool, in the low-70s. Saturday, a second system from the northwest will come in with a cold front. Keeping us cool in the low-70s to upper-60s in the valley and providng showers to the mountains and for the valley.
Hopefully these 2 different outcomes will become more in agreement tomorrow or Wednesday that way there is more confidence in the forecast for rain. It is something to watch closely.
On Sunday after the system we see more sunshine and breezy conditions. We get close to the 80s by Monday.