Marine Weather and Tides
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
|Sunrise 6:05AM||Sunset 8:27PM||Saturday July 22, 2017 7:42 PM PDT (02:42 UTC)||Moonrise 4:38AM||Moonset 7:11PM||Illumination 0%|
EDIT (on/off)  Help
7 Day Forecast for Marine Location Near Point Arena, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus66 kmtr 222327|
area forecast discussion
national weather service san francisco bay area
427 pm pdt Sat jul 22 2017
Synopsis Warmer temperatures are expected this afternoon,
especially inland. Temperatures will then begin to moderate on
Sunday as a weak upper level trough begins to develop off our
coast. A more pronounced cooling trend appears on tap for the
first part of next week, with a deepening marine layer and
increased onshore flow. But then by the latter part of the week,
high pressure looks to build back in again resulting in a return
to warming temperatures. Aside from some possible coastal drizzle,
no precipitation is presently expected in our area through the
Discussion As of 1:00 pm pdt Saturday... Visible satellite
reveals mostly clear skies across most of the region with the
exception being along parts of the immediate coastline. The clear
skies and building upper level high pressure will allow for
temperatures to warm this afternoon for interior locations. As of
12 pm pdt, hayward executive airport was already running 8 deg f
warmer than this time yesterday. Additionally, both oakland and
livermore were running 4 deg f warmer than yesterday. Temperatures
aloft are also warming. The 12z oakland sounding from earlier
today indicated a few deg c of warming at 850 mb from yesterday to
today. These are all signs of a warm-to-hot afternoon across
inland areas. We'll likely see the warmest locations surpass the
century mark with forecast high temperatures equating to about 5
to 15 degrees above climatological normals for middle late july.
The upper level ridge will still remain over the area on Sunday,
though a more southerly flow in the boundary layer may aid in
holding afternoon highs down by several degrees compared to today.
This holds particularly so for the north bay valleys where a
marine stratus intrusion is very possible in the morning. Cooling
will be very apparent for all interior locations on Monday when
high temperatures fall by at least 4 to 8 degrees as an upper
level low approaches the northern california coast. This low will
help to enhance southerly flow aloft over the state and bring with
it the potential for increased mid upper-level moisture. Forecast
models generally point to the sierra and deserts with the best
possible shower and thunderstorm potential, though both the gfs
and NAM try to expand the moisture advection to parts of southern
monterey county. In contrast, the ECMWF is keeping the most of mid
upper-level moisture east of the area. With the model uncertainly|
and continued inconsistent solutions from run-to-run, will hold
back from introducing thunder potential in the grids. Any westward
shift in this monsoonal moisture would create an increased chance
for thunder potential in our area.
Beyond Wednesday high pressure will again rebuild over the great
basin and will allow for a warming trend to commence for inland
areas into next weekend. This is consistent with the climate
prediction center's 6 to 10 day temperature outlook (valid july
28 to august 1) that points to an increased likelihood of above
normal temperatures across most of the golden state. Meanwhile
through the week, coastal locations will continue to see to the
typical morning low clouds and isolated drizzle.
Aviation As of 4:30 pm pdt Saturday... Upper level high over the
southwestern us extends to california today and has brought a
very warm airmass to the district. The marine layer is shallow at
around 1000 feet. The east-west component of the onshore gradient
has weakened quite a bit. As a result stratus is expected to be
confined to the coastal areas with little inland penetration
except through the golden gate in oak. Clouds in mry bay are
eroding and will have to see if it clears out during the early
evening instead of filling in.
Vicinity of ksfo...VFR. West winds to 15 kt through 04z.
Sfo bridge approach... Similar to ksfo.
Monterey bay terminals...VFR. Ifr CIGS vsby after 06z possibly
Marine As of 12:42 pm pdt Saturday... High pressure over the
eastern pacific will shift to the northwest today as a thermal
trough extends towards the central coast of california. As a
result, winds will begin to decrease for most of the coastal
waters. The northern outer waters, however, will remain gusty
through the weekend.
Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 3 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 3 am
sca... Sf bay until 11 pm
public forecast: rowe
aviation: W pi
visit us at
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
Click EDIT to select an airport
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help
EDIT (on/off)  Help
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of CentralWestCoast EDIT
Wind Forecast for San Francisco/Monterey Bay Area, CA (22,6,7,8)(on/off)  Help
Ad by Google
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.