Sunday, November19, 2017

Marine Weather and Tides
Point Arena, CA

Version 3.4
What's New / NOTES
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 6:54AMSunset 4:57PM Sunday November 19, 2017 4:05 AM PST (12:05 UTC) Moonrise 8:04AMMoonset 6:30PM Illumination 1% Phase: New Moon; Moon at 1 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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Fxus66 kmtr 191138
area forecast discussion
national weather service san francisco bay area
338 am pst Sun nov 19 2017

Synopsis Dry weather will continue through the end of the
weekend, with mild days and cool nights. The next weather system
will bring rain chances late tonight and Monday, mainly across
the north bay. There is a slight chance of additional rainfall at
times in the north bay for much of this week, but most of our
area is forecast to be warm and dry through thanksgiving.

Discussion As of 3:15 am pst Sunday... Early morning
temperatures are mostly in the mid 30s to mid 40s and are close
to where they were 24 hours ago. Patchy frost is likely for a few
hours around sunrise this morning, mainly in the north bay valleys
as well as the valleys of southern monterey county.

Today's weather is expected to be much like yesterday's, except
for more widespread high cloud cover. Afternoon highs will be
mostly in the 60s and winds will remain light.

Early morning satellite shows a plume of moisture over the
eastern pacific, approaching from the southwest. Precipitable water
values in this plume are in excess of 2 inches out near 30n 140w.

Meanwhile, a frontal boundary off the coast of washington and
oregon is sagging slowly to the southeast. This frontal boundary
is forecast to make its way into northwest california by late
tonight, but any further southward progression will be thwarted by
an upper ridge that will be building over central and southern
california. In any case, the models indicate there will be
sufficient warm advection acting on the moisture plume to produce
rainfall across the north bay late tonight and Monday. Elsewhere
across our region, subsidence under the building upper ridge is
expected to inhibit the development of precipitation, although
isolated light rain may occur as far south as the san francisco
peninsula and the east bay on Monday. Most models indicate that
rainfall totals in the north bay through late Monday will be on
the order of a quarter of an inch or less. However, the 06z nam
has trended wetter and forecasts as much as 1.5 inches of rain in
northwest sonoma county by late Monday. There certainly is
sufficient moisture approaching to produce these heavier rainfall
amounts, but given recent model trends of building the upper ridge
more strongly over california, these higher totals seem unlikely.

As is the often the case in situations such as this with moist
flow and warm advection under relatively high heights, there will
probably be a sharp gradient between soaking rains to the north
and no rain at all to the south. And that sharp precipitation
gradient will most likely set up somewhere near the
mendocino sonoma county line.

Rainfall in the north bay is expected to taper off Monday evening
and end by late Monday night. The upper ridge is forecast to
continue strengthening across the southwestern united states
through midweek. Meanwhile, moist southwesterly flow will continue
between this ridge and a deepening trough offshore near 145w. The
models agree that this moisture will remain completely north and
west of our area on Tuesday and Wednesday, and then perhaps sag
back south into the far northwest corner of our forecast area by
thanksgiving. But for the most part, the upper ridge will maintain
dry and warm conditions across nearly all of our forecast area
from Tuesday through thanksgiving. Widespread high temperatures in
the 70s are forecast during this period of time, with some low to
mid 80s likely from monterey bay southward.

The longer range models indicate the ridge will shift far enough
to the east late in the week to allow precipitation to gradually
spread into our forecast area between Thursday night and next
weekend. However, there are considerable model differences
regarding timing and location of rainfall late in the extended
forecast period.

Aviation As of 3:45 am pst Sunday... Offshore flow has weakened
but airmass is still dry. High cirrus clouds will drift over the
area but conditions will beVFR.

Vicinity of ksfo...VFR.

Sfo bridge approach...VFR.

Monterey bay terminals...VFR. Southeast winds to 10 kt in the
salinas valley from 15z-19z becoming light westerly in the

Marine As of 2:43 am pst Sunday... A 1022 mb high off the coast
of central california will bring light west to northwest winds
through today. Winds will switch to southerly Sunday night or
Monday ahead of a frontal system. Winds over the southern waters
will remain light to moderate out of the northwest. The front will
become stationary across the northern california waters through
midweek so southerly winds will persist.

Mtr watches warnings advisories
Tday None.

Public forecast: dykema
aviation: W pi
marine: W pi
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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 and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of CentralWestCoast    EDIT

Wind Forecast for San Francisco/Monterey Bay Area, CA (7,2,3,4)
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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 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.