Vine Hill, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

318
FXUS66 KMTR 230957
AFDMTR

Area Forecast Discussion
National Weather Service San Francisco CA
257 AM PDT Fri May 23 2025

...New MARINE...

.SYNOPSIS...
Issued at 252 PM PDT Thu May 22 2025

Elevated fire weather conditions continue through this evening due
to the combination of warm, dry, and windy conditions across the
region. Fire weather concerns ease by Friday morning with
pleasant, below normal temperatures and diurnally breezy winds to
continue into next week.

&&

.UPDATE...
Issued at 910 PM PDT Thu May 22 2025

Generally clear skies across most of the region, but for the first
time in a couple of nights, satellite imagery depicts the
formation of patchy stratus along the western slopes of the Marin
coastal ranges and the San Mateo hills, as well as a patch near
Bodega Bay. These are indicative of a rebuilding marine layer.
Combined with cooler temperatures and continuing onshore flow,
this will help alleviate fire weather concerns in the interior,
particularly as overnight humidity recoveries will improve through
the week. Unfortunately, there was a grass fire that did pop up
at the eastern edge of Alameda County today. Forward progress has
been stopped, but this is a reminder that the fire season is
quickly approaching. As for the forecast, no changes at this time.

DialH

&&

.SHORT TERM...
(This evening through Friday)
Issued at 252 PM PDT Thu May 22 2025

Strong onshore winds gusting between 30 to 35 mph along the coast,
mountain gaps and passes, and northwest/southeast oriented valleys
continue overnight into Friday morning. Elevated fire weather
concerns persists through this evening with dry conditions across
the interior (relative humidity values in the 15 to 30% range). The
primary concern continues to be for areas where grasses are cured
(grasses have browned/dried out). An approaching upper level trough
will help to bring in more moist air and deepen the marine layer to
1500 ft tonight. This increase in moisture will ease the elevated
fire concerns that we have seen over the last few days with
overnight relative humidity values increasing to 70-90% across the
interior.  Patchy stratus cover will return to coastal areas and the
San Francisco Bay region overnight but is not expected to be
widespread. Breezy winds will continue again on Friday, but, they
will be weaker than those observed on Wednesday/Thursday. Winds are
expected to gust between 20-25 mph on Friday along the coast,
through the valleys, and across the elevated terrain. Temperatures
across the North Bay hold steady in the upper 70s on Friday while
temperatures across the rest of the Bay Area will drop by about 5
degrees. This will bring most locations across the South Bay and
East Bay into the upper 60s to mid 70s and into the 50s to 60s along
the San Francisco Peninsula. Residents of the interior Central Coast
may feel a more substantial drop, with highs to drop from the upper
80s to low 90s on Thursday to the low to mid 80s on Friday. If you
find yourself thinking that this is a bit chilly for May, you would
be correct in that Friday`s forecast temperatures are expected to be
around 10 degrees below normal for this time of year.

&&

.LONG TERM...
(Friday night through next Wednesday)
Issued at 252 PM PDT Thu May 22 2025

Surface high pressure and a positively tilted upper level trough
will build in over the weekend into next week over the West Coast.
This will help to keep our temperatures and winds in a fairly stable
pattern this week. For temperatures, highs will stay in the 70s to
low 80s across the interior and upper 50s to mid 60s along the
coastline. Diurnally breezy winds between 20 to 30 mph will continue
across the coastline, valleys, and across the elevated terrain
through Wednesday. Overall this upcoming week looks pleasant with
temperatures running around 10 degrees below normal. That will
change by late next week with temperatures looking to rise again and
CPC forecasting above normal temperatures from the end of May into
June. In the longer run, both the GFS and ECMWF are starting to
generate a cut-off low oriented offshore to the southwest of the
California coastline. While this is still a ways out, it may be
worth keeping an eye on for the possibility of offshore winds across
the CWA.

&&

.AVIATION...
(12Z TAFS)
Issued at 254 AM PDT Fri May 23 2025

A few areas of coastal stratus /MVFR-IFR/ are forming early this
morning, including some inland formation of stratus clouds /MVFR/
as well, otherwise it`s VFR. The northerly and westerly pressure
gradients (and winds) will be weighted more equally today with
the gradients approx 3 to 4 mb from ACV to SFO and from SFO to
SAC. Surface to near surface cool air advection predominates from
the San Francisco Peninsula over to the East Bay and the South Bay
to the northern Monterey Bay Area early this morning which is
helping to bring the air to saturation forming areas of stratus.
During the daylight hours, mixing will increase and reduce the
areal coverage of stratus, then with cooling tonight and early
Saturday coastal stratus and fog /IFR-LIFR/ will develop; the
lower level temperature inversion strengthening and compressing
the marine layer.

Vicinity of SFO...Gusty west wind will transport stratus /MVFR-
IFR/ to the terminal this morning until mixing out to VFR at 16z.
West wind gusty today with gusts near 30 knots during the afternoon
and early evening. HREF output shows stratus /IFR/ returning tonight
and Saturday morning. The marine layer will compress tonight and
Saturday morning increasing the probability that the stratus ceiling
will be IFR.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Stratus /MVFR-IFR/ is continuing to form
early this morning. MVFR-IFR until later this morning with stratus
then mixing out to MVFR-VFR for the afternoon, then HREF output
shows stratus /IFR/ redeveloping this evening and continuing
overnight to Saturday morning. Onshore winds 5 to 10 knots except
10 to 20 knots in the afternoon and early evening.

&&

.MARINE...
(Today through Wednesday)
Issued at 257 AM PDT Fri May 23 2025

Hazardous marine conditions continue across the waters as strong
northwesterly breezes with near gale to gale force gusts and rough
seas persist. Fresh to strong northwesterly breezes and moderate
to rough seas will prevail through Monday.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...Small Craft Advisory until 3 AM PDT early this morning for SF
     Bay N of Bay Bridge.

     Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this
     evening for SF Bay N of Bay Bridge.

     Gale Warning until 3 AM PDT early this morning for Mry Bay-
     Pigeon Pt to Pt Pinos 0-10 nm.

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

     Small Craft Advisory until 9 AM PDT this morning for Pt Arena to
     Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM-Pt Reyes to
     Pigeon Pt 0-10 nm.

     Gale Warning from 9 AM this morning to 3 AM PDT Saturday for Pt
     Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM-Pt
     Reyes to Pigeon Pt 0-10 nm.

     Gale Warning until 3 AM PDT Saturday for Pt Pinos to Pt Piedras
     Blancas 0-10 nm.

     Small Craft Advisory until 9 PM PDT Saturday for Pigeon Pt to Pt
     Pinos 10-60 NM.

&&

$$

SHORT TERM...Kennedy
LONG TERM....Kennedy
AVIATION...Canepa
MARINE...Canepa

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