FXUS66 KMTR 292320
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
420 PM PDT Fri May 29 2026

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 1210 PM PDT Fri May 29 2026

 - Temperatures return closer to normal by Sunday, and remain 
   near or slightly above normal for much of the upcoming work 
   week

 - Cooler than normal temperatures may return by end of next week

&&

.SHORT TERM...
Issued at 1210 PM PDT Fri May 29 2026
(This evening through Saturday)

The mid/upper level low that provided recent rainfall across the 
region has shifted over Nevada with a short-wave ridge building in 
from the Pacific. A mix of sun and clouds are expected throughout 
the afternoon as PWAT values remain ~1.00" and lingering surface 
moisture is abundant. Thus, cloud cover may limit how warm 
temperatures get today. We are forecasting maximum high temperatures 
to be in the upper 50s to middle 60s near the coast with middle 60s 
to lower 70s across the interior. 

Expecting low clouds once again tonight with the potential for fog 
in the North Bay (mainly around Santa Rosa, Petaluma, and Navato) 
and coastal drizzle around the Monterey Peninsula. Any low clouds 
and/or fog that does develop is expected to clear out by midmorning 
(Saturday). As the ridge aloft shifts further to the east over the 
region, expecting the warming trend to continue on Saturday with 
high temperatures ranging from the upper 50s along the immediate 
coastline, low to middle 60s just inland, and lower to upper 70s in 
the interior.

&&

.LONG TERM...
Issued at 1210 PM PDT Fri May 29 2026
(Saturday night through next Thursday)

Zonal flow will return to the region through the middle of the 
upcoming week while 500mb heights warm slightly. This will result in 
a warming and drying trend across the interior. By Monday and moreso 
into Tuesday, the marine layer is forecast to return resulting in 
cooler temperatures in coastal locations versus inland as low clouds 
will be slower to dissipate each morning. Conditions look to cool 
by late in the work week as troughing approaches the West Coast. 

&&

.AVIATION...
(00Z TAFS)
Issued at 412 PM PDT Fri May 29 2026

As high pressure builds, the marine layer will reform and
compress, bringing low clouds to the terminals tonight. The exact
ceiling height is a little uncertain, but expect a lowering trend
through the early morning hours. Otherwise standard onshore wind
directions are expected through the TAF period.

Vicinity of SFO...The ceiling has refused to yield this evening, 
and it doesn't look like it will with ample cloud cover advecting 
in from the ocean. The current MVFR ceiling will certainly lower 
overnight as high pressure builds, but the exact cloud base in the
morning is still tricky. Somewhere around 1,000 feet seems 
reasonable, but anything between 500 and 2,000 feet is possible as
the marine layer gradually reforms and compresses.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...The afternoon clearing will only last for
a couple more hours before overcast skies take over this evening
and lower through the night. It's basically a guarantee that MVFR
ceilings will return. The bigger question is if they will reach
the IFR level Saturday morning. That's more 50/50 right now. 

&&

.MARINE...
(Tonight through next Wednesday)
Issued at 412 PM PDT Fri May 29 2026

Stronger high pressure to the north will result in moderate to
fresh northerly breezes tonight and into the weekend. The
strongest winds will be over the northern outer waters.
Occasional gale force gusts will occur the north of the Golden
Gate and along the Big Sur Coast. Increasing winds and building
seas will lead to hazardous conditions over the coastal waters
beginning tonight lasting into the weekend.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory from 3 PM to 9 PM PDT Saturday for Mry Bay.

     Small Craft Advisory until 9 PM PDT Sunday for Pt Arena to Pt 
     Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.

     Small Craft Advisory from 3 PM Saturday to 3 AM PDT Sunday for 
     Pigeon Pt to Pt Pinos 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

     Small Craft Advisory from 9 PM this evening to 9 PM PDT Sunday 
     for Pigeon Pt to Pt Pinos 10-60 NM-Pt Pinos to Pt Piedras 
     Blancas 0-10 nm.

&&

$$

SHORT TERM...RGass
LONG TERM....RGass
AVIATION...Flynn
MARINE...MM

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Prepared by Boulder-Creek.com Weather at: Fri May 29 20:30:02 PDT 2026