Friday, January17, 2020
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Marine Weather and Tides
Point Arena, CA

Version 3.4
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:21AMSunset 5:18PM Friday January 17, 2020 5:54 PM PST (01:54 UTC) Moonrise 12:32AMMoonset 12:18PM Illumination 47% Phase: Third Quarter Moon; Moon at 22 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
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7 Day Forecast for Marine Location Near Point Arena, CA
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location: 36.95, -126.32     debug

Area Discussion for - San Francisco/Monterey Bay Area, CA
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Area Forecast Discussion National Weather Service San Francisco Bay Area 357 PM PST Fri Jan 17 2020

SYNOPSIS. High pressure building over the west coast will lead to dry and seasonable weather. Quiet weather continues Saturday and Sunday with plenty of sunshine and daytime highs in the 50s. Increasing clouds by Monday leading to a chance of light rain early next week.

DISCUSSION. as of 1:38 PM PST Friday . High clouds are filtering the sunshine across the district, but area temperatures are trending warmer than yesterday at this time with readings from the upper 40s to the mid 50s. Under partly cloudy skies tonight, locally dense fog is expected to form in some of the inland valleys tonight, particularly in the East Bay Valleys as a light offshore flow could advect Tule fog westward. Aside from night and morning fog, seasonably mild weather is expected through the weekend with highs in the 50s to lower 60s and overnight lows in the mid 30s to mid 40s.

The next chance of rain could be on Tuesday and Wednesday when a short-wave trough moves onshore across Northern California. Medium range models build another ridge along the coast. Then another system is possible a week out, but there is still a lot of noise in the ensemble members. Therefore, there still remains a lot of uncertainty in the extended forecast at this time.

AVIATION. as of 4:00 PM PST Friday . High pressure building over the district and low pressure off the Pacific Northwest will result in light winds during the daytime and light drainage offshore winds at night. A few afternoon cumulus clouds remain as there is still some residual low-level moisture. Increasing high clouds tonight but remaining VFR except for fog in the North Bay valleys.

Vicinity of KSFO . VFR with a few cumulus clouds until dark. Light offshore winds under 10 kt.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Light onshore flow will switch to southeast tonight.

MARINE. as of 03:45 PM PST Friday . A high pressure is aligned over the coastal waters, bringing locally breezy southeasterly winds along the coast and northern outer waters with lighter variable winds elsewhere. These winds will persist through the weekend before strengthening and turning predominately southerly by Monday morning ahead of an approaching front. A moderate northwest swell will arrive late Saturday and Sunday while a larger northwest swell arrives the middle of next week. The swell in excess of 10 feet may be hazardous for small craft vessels.



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Weather Reporting Stations
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Airport Reports
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Tide / Current Tables for
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Weather Map
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GEOS 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (20,4,5,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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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 numerous 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.