Sunday, August25, 2019

Marine Weather and Tides
Point Arena, CA

Version 3.4
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at Allen

Sunrise 6:33AMSunset 7:51PM Sunday August 25, 2019 6:00 PM PDT (01:00 UTC) Moonrise 12:34AMMoonset 3:26PM Illumination 21% Phase: Waning Crescent; Moon at 25 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
    EDIT      (on/off)   Help

7 Day Forecast for Marine Location Near Point Arena, CA
   Hourly   EDIT   Help
location: 36.95, -126.32     debug

Area Discussion for - San Francisco/Monterey Bay Area, CA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus66 kmtr 252055
area forecast discussion
national weather service san francisco bay area
155 pm pdt Sun aug 25 2019

Synopsis High pressure will produce warmer temperatures through
early next week, especially across inland areas where very warm
temperatures are forecast. The marine layer will persist along the
coast, along with light onshore flow, resulting in relatively
mild temperatures near the ocean and bays. Moisture from tropical
storm ivo may pass across our area from Tuesday afternoon into
Wednesday, bringing increasing clouds and higher humidity. Cooler
temperatures are forecast for the second half of next week.

Discussion As of 1:55 pm pdt Sunday... The low clouds from
earlier this morning have retreated back to the immediate
coastline, providing mostly sunny skies for much of the san
francisco bay area. Visible satellite shows the remaining marine
stratus at locations such as point reyes, ocean beach in san
francisco, half moon bay, and moss landing. Temperatures are
generally running about 2 to 5 degrees f warmer than they were 24
hours ago, consistent with the expected trends by the time the
afternoon wraps up. High temperatures along the coast will
register in 60s 70s with inland locations warming the upper 80s to
90s. Some of the region's hottest locations such as pinnacles
national park and extreme southern monterey county will approach
and possibly exceed 100 degrees.

A broad 594 dm ridge at 500 mb is largely responsible for the warm
to hot weather across the region. With gradual warming at 850 mb
forecast over the next 24 hours, surface temperatures on Monday
afternoon will at least match and likely exceed today's readings
by at least a few to several degrees. The marine layer is not
expected to get any deeper than its present 1,000 ft depth with
the ridge firmly overhead; therefore, any stratus coverage on
Monday morning will likely be limited to the shorelines. Though
high temperatures will be around 5-10 degrees above late august
climatological normals both today and tomorrow, most population
centers will benefit from appreciable overnight cooling that will
prevent heat risks from going beyond the moderate category for
interior communities. Locations at above 750-1000 ft elevation
will be the isolated spots that can expect mild overnight lows in
mid 60s to 70s.

The much discussed now tropical depression ivo continues its
northbound trajectory in the eastern pacific, presently situated
about 500 miles wnw of the southern tip of the baja california
peninsula. Further weakening is expected as it is forecast to
become a remnant low later today. The leftover moisture from ivo
will continue north over the next several days, and will parallel
the california coast by late Tuesday and into Wednesday. The 12z
models keep the bulk of moisture and best instability offshore;
however, the latest NAM does try to bring some of the higher rh
values and mid-level instability to northern california on
Wednesday afternoon. The present forecast would provide locations
north of sonoma county the best potential for any scattered
showers storms, but this is subject to change, particularly if the
remnant moisture tracks east by 50 to 100 miles. The most likely
impacts at this point for much of the san francisco bay area and
central california coast will be increased cloudiness in the mid-
levels as well as higher dewpoints at the surface.

Temperatures are forecast to moderate by the end of the week with
more seasonable highs expected as trough approaches the pacific
northwest. The latest climate prediction center 6-10 day outlook
does paint a large area with increased probabilities of above
normal temperatures for the west coast for the beginning of
september as the ridge begins to rebuild.

Aviation As of 10:40 am pdt Sunday... For 18z tafs. Current
satellite imagery shows stratus clearing to the coast.VFR
conditions are expected for the rest of the day but patchy stratus
and possible fog will return again tonight most areas. Light
winds this morning to increase and turn onshore this afternoon
10-15 kt with occasional higher gusts possible.

Vicinity of ksfo...VFR conditions through the evening. Patchy
stratus to return overnight. W to NW winds around 10 kt this
morning increasing to 15 kt this afternoon.

Sfo bridge approach... Low clouds still clearing over the approach.

Otherwise, similar to ksfo.

Monterey bay terminals...VFR conditions with ifr CIGS potentially
returning early this evening. Onshore winds this afternoon 10-15

Marine As of 8:26 am pdt Sunday... Weakening high pressure over
the eastern pacific will keep light winds over the coastal waters
through early to mid next week. Sea breezes will develop in the
afternoons and evenings over the san francisco bay to the delta.

Southerly swell will increase to 2 to 3 feet today and persist
through early next week as a tropical system west of the baja
peninsula progresses northward. Additionally, light to moderate
northwest swell will continue through the period.

Mtr watches warnings advisories
Tngt None.

Public forecast: rowe
aviation: sims
marine: sims
visit us at

Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
Click EDIT to select an airport
Tide / Current Tables for
   EDIT   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   HelpWeather Map
GOES Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (21,6,7,8)
      (on/off)   Help

Ground Weather Radar Station San Francisco Bay Area, CA
   (on/off)   Help
weather_mapweather_map weather_map

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 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 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.