FXUS66 KMTR 150419
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
919 PM PDT Tue Jul 14 2026

...New AVIATION, MARINE...

.KEY MESSAGES...
Updated at 101 PM PDT Tue Jul 14 2026

 - Moderate HeatRisk across the interior through Wednesday

 - Breezy onshore winds today through Thursday afternoon 

 - Minor coastal flooding continues through Thursday due to large
   tidal swings

&&

.SHORT TERM...
Issued at 101 PM PDT Tue Jul 14 2026
(This evening through Wednesday night)

This afternoon is forecast to be the warmest of the week with 
temperatures across the interior peaking in the middle 90s up to 
around 103 deg F. As such, we have a Heat Advisory out for most of
the interior through 10 PM tonight where we have Moderate 
HeatRisk forecasted. Near the coast, temperatures will be 
moderated by the afternoon sea breeze (yet up to 6 degrees above 
average given the lack of a stratus deck). That said, very dry 
conditions (especially in the higher terrain) will persist through
midweek as high pressure over the Rockies and Midwest persists. 
Please see the Fire Weather section of the AFD for more 
information.

Tonight, expecting mostly clear sky conditions across the region 
and temperatures near the coast and in the valleys to be in the 
60s. However, some guidance suggests the North Bay coast and 
adjacent valleys and locations along the immediate coastline 
across the entire region will cool into the 50s with better 
radiational cooling given the lack of high cloud cover. 

How much cooling that occurs overnight into Wednesday morning 
will likely dictate how warm tomorrow will be to some extend. We 
again continue to have a Heat Advisory in effect for the Santa 
Lucia Rage, Los Padres National Forest, and the southern Salinas 
Valley from 10 AM - 10 PM Wednesday where the most widespread 
Moderate HeatRisk exists. Elsewhere, temperatures continue on a 
downward trend for Wednesday (still above seasonal averages 
however). 

&&

.LONG TERM...
Issued at 101 PM PDT Tue Jul 14 2026
(Thursday through next Monday)

A mid/upper level trough just off of the Pacific Northwest coast 
will deepen slightly late in the week, bring temperatures closer 
to seasonal averages as onshore flow increases. This will also 
bring Minor HeatRisk to just about all of the region Thursday and 
beyond. As a result of increased onshore winds, the marine layer 
is forecast to deepen to around 1,000 feet in depth. 

From the previous forecaster: "At 500 mb the high pressure over the 
Rockies will remain in place as the trough approaches the coast. 
This pattern will keep mid-level winds out of the south to southwest 
through the week. That means the tropical moisture conveyer belt 
will remain open. While dry air will dominate the middle of the 
week, there is an increasing chance that one of the many robust 
tropical waves off the coast of Mexico will develop into a tropical 
cyclone this week aided by the warm El Nino waters. If that happens, 
there is a chance that some of the associated moisture will be drawn 
into the SW winds and advect over the Bay Area, bringing us similar 
impacts and considerations that we saw with recent monsoon moisture 
event. Depending on the strength of the TC, there could also be 
impacts from ocean swell at the beach. The uncertainty is still 
high, but it's been trending more likely recently. The ECMWF 50 
member ensemble has a mean PW returning above 1.0" by Sunday- 
Monday. That's around the 90th percentile for this time of year. I 
also noticed 7 of the members have a PW over 1.5", and 2 members are 
over 2". The highest we've ever recorded is 1.79", and that was on 
8/16/2020, when the remnants of Tropical Storm Fausto brought a 
major dry lightning outbreak to the Bay Area and sparked several 
wildfires. I'm certainly not predicting a repeat of August 2020, but 
it's worth keeping an eye on this next potential moisture push given 
the current warm temperatures and dry fuels."

&&

.AVIATION...
(06Z TAFS)
Issued at 919 PM PDT Tue Jul 14 2026

Satellite shows it's clear across much of the forecast area. KHAF
reports MVFR in haze. VFR is forecast except a patch or two of 
coastal stratus and fog may develop tonight and Wednesday morning.

Vicinity of SFO...VFR. Northwest to west wind 10 to 15 knots tonight
and Wednesday morning. West wind increasing to 20 to 25 knots Wednesday
afternoon and evening.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR except patchy stratus and fog /LIFR-IFR/
possibly nearby late tonight and Wednesday morning. Winds mainly west
to northwest 5 to 15 knots.

&&

.MARINE...
(Tonight through next Monday)
Issued at 916 PM PDT Tue Jul 14 2026

Moderate to fresh northwesterly breezes will strengthen to fresh
to strong across the coastal waters this week. This will result
in widespread hazardous conditions for small craft.

&&

.FIRE WEATHER...
Issued at 101 PM PDT Tue Jul 14 2026

The warm temperatures we have had the past several days and 
continued warm weather has resulted in fuels rapidly drying this 
week. ERC charts are expected to exceed the 97th percentile across
the Mid Coast to Mendocino zone and get close to the 97th 
percentile across the Central Coast. Fire weather concerns will 
remain elevated this afternoon through Thursday due to near 
critically dry conditions, gusty onshore winds, and very dry fuel 
conditions. This may result in additional fire starts particularly
across the interior and higher elevations. Unsettled weather is 
possible next weekend with returning potential for dry 
thunderstorms and gusty, erratic winds.

RGass/Flynn

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...Coastal Flood Advisory until 4 AM PDT Thursday for CAZ006-506-
     508.

     Heat Advisory until 10 PM PDT this evening for CAZ503-504-506-
     510-513>517-528.

     Coastal Flood Advisory until 4 AM PDT Wednesday for CAZ505-509-
     529-530.

     Heat Advisory from 10 AM to 10 PM PDT Wednesday for CAZ516-517.

PZ...Small Craft Advisory from 3 PM to 9 PM PDT Wednesday for Mry Bay.

     Small Craft Advisory from 9 AM to 3 PM PDT Thursday for Mry Bay-
     Pigeon Pt to Pt Pinos 0-10 nm.

     Small Craft Advisory until 3 PM PDT Thursday for Pt Arena to Pt 
     Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.

     Small Craft Advisory from 9 AM Wednesday to 3 PM PDT Thursday 
     for Pt Reyes to Pigeon Pt 0-10 nm.

     Small Craft Advisory from 9 AM to 9 PM PDT Wednesday for Pigeon 
     Pt to Pt Pinos 0-10 nm.

     Small Craft Advisory until 9 AM PDT Thursday for Pt Pinos to Pt 
     Piedras Blancas 0-10 nm.

     Gale Warning from 9 AM to 3 PM PDT Thursday for Pt Pinos to Pt 
     Piedras Blancas 0-10 nm.

     Small Craft Advisory from 3 PM Wednesday to 3 PM PDT Thursday 
     for Pigeon Pt to Pt Pinos 10-60 NM.

&&

$$

SHORT TERM...RGass
LONG TERM....RGass
AVIATION...Canepa
MARINE...Canepa

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Prepared by Boulder-Creek.com Weather at: Tue Jul 14 22:30:03 PDT 2026