FXUS66 KMTR 091919
AFDMTR
Area Forecast Discussion
National Weather Service San Francisco CA
1219 PM PDT Sat May 9 2026
...New SHORT TERM, LONG TERM...
.KEY MESSAGES...
Updated at 1217 PM PDT Sat May 9 2026
- Warming and drying trend will continue through early in the
week with afternoon temperatures peaking on Monday
- Moderate risk for heat-related illnesses for sensitive
populations across the interior on Monday
- Gradual cooling trend and potential unsettled weather from
midweek through late week
&&
.SHORT TERM...
Issued at 1217 PM PDT Sat May 9 2026
(This evening through Sunday)
Low clouds have treated to the coast as of early this afternoon.
Thus, as high pressure aloft continues to build, inland
temperatures will be a few degrees warmer compared to yesterday.
Thus, afternoon temperatures are forecast to reach into the mid
80s to lower 90s (far inland areas) as high pressure continues to
build over the region. The coast will remain cooler, generally in
the upper 50s to 60s, thanks to onshore flow and the compressed
marine layer.
Tonight, expecting low clouds to return to the coast and adjacent
inland valleys (similar to this morning). Again, there is the
potential for mist or light drizzle again tonight into Sunday
morning, yet widespread measurable rainfall is highly unlikely.
Sunday will feature similar temperatures as Saturday as the
mid/upper level ridge shifts into southern California, Nevada, and
Arizona. Low clouds that do develop inland will quickly retreat
to the coast Sunday by midmorning giving way to mostly sunny skies
inland.
&&
.LONG TERM...
Issued at 1217 PM PDT Sat May 9 2026
(Sunday night through next Friday)
Low clouds persist near the coast and will return inland Sunday
night, however less widespread across the interior valleys. Monday
is still on track to be the warmest of the week as interior areas
reach Moderate HeatRisk as the high pressure strengthens over the
Desert Southwest. Temperatures by Monday afternoon are forecast
to be in the low to upper 90s across the interior, mid 80s to low
90s across inland away from the coast, and low 70s to mid 80s near
coastal locations. The cooler conditions near the coast will be
due to the marine layer not completely going away and continued
onshore winds.
Temperatures are forecast to cool slightly by Tuesday, however
will still remain some 5-15 degrees above seasonal averages. There
is increasing confidence that a cut-off low pressure system will
approach from the eastern Pacific by midweek, bring cooler and
unsettled weather to the region for the remainder of the upcoming
week. This will work to push the mid/upper level ridge across the
Desert Southwest farther to the east. Not expecting much
widespread measurable rainfall, however this pattern would be more
favorable for drizzle and/or light rain. There are still
differences in model guidance about the strength and southern
extent of the mid/upper level trough by midweek. Late in the week,
more zonal flow is forecast to develop over the region. Be sure
to check back for the latest forecasts as we gain more reliable
short range guidance.
&&
.AVIATION...
(18Z TAFS)
Issued at 1059 AM PDT Sat May 9 2026
Stratus is receding from all terminals with the exception of HAF.
Breezy onshore winds and VFR conditions are expected for much of the
afternoon. Stratus is set to return again tonight with MVFR to IFR
CIGs returning late this evening along the coast and overnight
across the interior. Not anticipating fog to develop but temporary
decreases in visibility are possible across the interior and along
the coast.
Vicinity of SFO...VFR with gusty onshore winds through this evening.
Recent SFO obs show NW winds strengthening to around 15-20 knots
with gusts up to 30 knots expected late this morning into the
afternoon. Winds ease this evening with MVFR-IFR CIGs to return
overnight.
SFO Bridge Approach....Similar to SFO.
Monterey Bay Terminals...Stratus is in the process of clearing at
MRY and SNS with clearing to occur within the next hour. VFR
conditions prevail through the afternoon/early evening before IFR-
LIFR conditions return late evening through tomorrow morning.
Moderate confidence that CIGs will initially start out IFR and lower
to LIFR early tomorrow morning. There is some potential for
visibilities to decrease after 12Z particularly at SNS.
&&
.MARINE...
(Today through Thursday)
Issued at 850 AM PDT Sat May 9 2026
Fresh to strong northwest breezes with occasional near gale force
gusts will continue through the remainder of the weekend along
with moderate seas. Winds become more northerly on Sunday before
gradually easing late Sunday into Monday. Gentle to moderate north
to northwest breezes are expected on Tuesday and Wednesday with
breezy conditions returning to the inner waters late week.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 9 PM PDT this evening for Mry Bay.
Small Craft Advisory from 3 PM to 9 PM PDT Sunday for Mry Bay.
Small Craft Advisory until 3 AM PDT Monday for Pt Arena to Pt
Reyes 0-10 nm.
Small Craft Advisory until 9 PM PDT Sunday for Pigeon Pt to Pt
Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Pinos to Pt
Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.
Small Craft Advisory until 9 AM PDT Monday for Pt Arena to Pt
Reyes 10-60 NM.
&&
$$
SHORT TERM...RGass
LONG TERM....RGass
AVIATION...Kennedy
MARINE...Kennedy
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Prepared by Boulder-Creek.com Weather at: Sat May 9 14:30:03 PDT 2026
From the National Weather Service
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