, Issued at 103 PM PDT Sat Jun 6 2026 (This evening through Sunday)
A deep upper level low will move into the PNW today. This will bring a cooler airmass and below normal surface temperatures to our region. Temperatures are running between 3 to 7 degrees below normal across the lower elevations and around 10 to 15 degrees below across the higher elevations. Coastal temperatures stay in the 50s to 60s while interior areas stay in the 70s to mid 80s. Seasonally cool temperatures continue into Sunday with high temperatures remaining similar to Saturday. Coastal residents and anyone driving through elevated terrain and mountain gaps/passes may notice gustier winds today. As of noon, most coastal areas have seen gusts between 20 to 35 mph while the higher elevations/mountain gaps and passes have seen gusts to around 45 mph. The SFO-WMC gradient is expected to strengthen to +10 to +13 mb this afternoon with surface winds to remain gusty throughout the day. For the most part wind gusts should stay similar to what was observed this morning but cannot rule out locally stronger gusts across areas that promote terrain wind funneling (the Altamont Pass and San Bruno Gap). Winds ease heading into Sunday as the SFO-WMC pressure gradient relaxes overnight. Breezy winds return along the coast and across mountain gaps/passes during the day on Sunday with the SFO-WMC gradient restrengthening to around +7 to +8 mb. Winds will be weaker on Sunday than on Saturday with gusts peaking between 20-25 mph along the coast and locally stronger gusts across mountain gaps/passes.
..issued at 103 PM PDT Sat Jun 6 2026 (Sunday night through next Friday)
Upper level troughing and seasonally cool temperatures continue into the early work week with drizzle/light rain possible late Monday into early Tuesday. High temperatures stay in the 50s to 60s on the coast and in the 70s across the interior on Monday before a warming trend kicks off Tuesday. As upper level troughing persists, it will bring a good stream of moisture to the West Coast Monday night into early Tuesday. PWATs are particularly impressive for an early summer system with values ranging from 1" to 1.3". As the night shift noted, June is typically the start of our dry season when we typically see no rain. The current forecast shows up to a tenth of an inch across the North Bay and a few hundredths of an inch along coastal San Mateo County and the SF Bay shoreline. Looking at ensembles, models are in agreement that any precipitation will be light and generally less than a tenth of an inch. On the higher end of the forecast, ensembles suggest up to three tenths of an inch in the North Bay Mountains with around a tenth of an inch across the Bay Area. The higher end forecast seems unlikely at this current moment, with most models in support of the most likely forecast. Not currently seeing much thunderstorm potential with this system for MTR's warning area. MUCAPE values are generally negligible with more likely potential for thunderstorms to the north and south of our service area. The most likely scenario is drizzle to light rain across the North Bay with drizzle extending into the Bay Area/along the coast. Totals will be light but, given that we are now in the dry season, any rain at all is beneficial.
Tuesday acts as a transition day with temperatures warming into the mid 70s to low 80s across the interior before a more substantial warming trend kicks off mid to late week. Temperatures will be seasonally warm (60s to mid 70s) along the coast and above normal (mid 80s to mid 90s) across the interior. This is still a ways out but ensemble cluster guidance does support ridging building in mid to late week as upper level troughing moves eastward. There is some potential for gusty northerly winds across the North Bay Interior Mountains Wednesday into Thursday as upper level troughing digs into the Intermountain West. Cluster guidance is in good agreement that ridging will be centered over the Eastern Pacific/extend into the West Coast but it disagrees as to how much the trough will dig/how deep it will be over the Rockies. Any fire weather concerns from this may be semi abated (depending how much precipitation falls) by drizzle/light rain on Tuesday.
(00z TAFS) Issued at 455 PM PDT Sat Jun 6 2026
Gusty west winds continue this evening with gusts in excess of 35 kt for SFO til at least 06z. Lighter west winds at the other terminals with only a thin band of high clouds passing overhead. Local low cig formation after 04z for KMRY and KHAF. Continued persistent west wind flow on Sunday but with VFR skies forecast most of the day for the terminals except KMRY with early morning cigs.
Vicinity of SFO, Gusty west winds with gusts to around 35 kt through 06z under clear skies. Winds ease overnight then increase again Sunday afternoon but lower values than the last few days with gusts less than 30 kt.
SFO Bridge Approach, Mostly clear skies with westerly winds less than 20kt
Monterey Bay Terminals, Passing high clouds. Breezy NW winds for KMRY and KSNS. Local cigs to develop after 04z with early clearing by 16z.
(today through Thursday) Issued at 858 AM PDT Sat Jun 6 2026
Gale force gusts will prevail across the outer and inner waters through early Sunday morning. As a result, very rough seas across the outer waters and rough seas over the inner waters with hazardous conditions for small craft through the remainder of the weekend. However, conditions do begin to improve Sunday with moderate seas and fresh northwesterly breezes for the beginning of next week.
Ca, None. PZ, Small Craft Advisory until 3 AM PDT Sunday for Mry Bay-SF Bay N of Bay Bridge.
Gale Warning until 3 AM PDT Sunday for Pigeon Pt to Pt Pinos 10- 60 NM-Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10- 60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.
Gale Warning until 9 PM PDT this evening for Pigeon Pt to Pt Pinos 0-10 nm.
