Monday, November20, 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 6:55AMSunset 4:56PM Monday November 20, 2017 5:31 AM PST (13:31 UTC) Moonrise 8:57AMMoonset 7:13PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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 201149
area forecast discussion
national weather service san francisco bay area
347 am pst Mon nov 20 2017

Synopsis A weather system will bring periods of light rain to
the north bay and possibly san francisco today. High pressure will
bring dry and warmer weather to the area Tuesday through Thursday.

The next chance of rain will be late this weekend.

Discussion As of 3:15 am pst Monday... Cloudcover and southwest
flow over the area is keeping temperatures in the 50s early this
morning which is about 10 degrees warmer than the past couple of
nights. A warm front is bringing light rain to the north bay this
morning. Rain amounts so far have generally been .10" or less.

Periods of light rain will continue through early afternoon in the
north bay with the possibility of a sprinkle as far south as san
mateo and alameda counties. Total rainfall amounts will remain
under one-quarter of an inch.

Things will dry out tonight as the warm front lifts north. An
upper level trough deepening along 145w will cause an upper level
ridge to build over southern california and nevada. This will
keep rain north of the district while bringing warmer temperatures
Tuesday through Thursday. The warmest temperatures will be
Wednesday and Thursday with highs in the 70s to lower 80s in
monterey and san benito counties. Temperatures around the sfo bay
area will warm into the upper 60s to lower 70s.

The ridge flattens on Friday and temperatures will cool off
slightly. Then the ridge moves a little to the east Saturday and
Sunday and the trough starts to move to the northeast. Medium
range models indicate a warm front will bring a chance of rain to
the north bay Saturday night and most of the rest of the district
Sunday. Then another chance of rain Sunday night and Monday as the
trough passes.

Based on recent performances by the models... Would not be surprised
if future model runs trend drier with the weekend system and track
it further north. In any case rainfall rates and amounts will be

Aviation As of 3:47 am pst Monday... It'sVFR at the terminals
except CIGS are MVFR over the north bay this morning. Cloud bases
have been steadily lowering since last evening as a very moist,
milder, and stable SW flow from the sub-tropics becomes displaced
to the pacific northwest and northernmost california this week.

This plume of moisture will brush the north bay with light-moderate
rain today, while it remains mainly dry to dry elsewhere to the

20-30 knot SW winds at the 925 mb and 850 mb levels over the north
bay counties will result in marginal low level wind shear (llws) at
ksts this morning til early afternoon. Lower level winds are much
less robust over the remaining bay area and areas to the south today
thus llws is not expected to the south.

Vicinity of ksfo... Light wind,VFR. Cloud bases lowering today, and
forecast is dry runways. Low to moderate confidence.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Light e-se winds this morning, except SE to
10 knots salinas valley.VFR and dry. Moderate to high confidence.

Marine As of 3:35 am pst Monday... The eastern edge of a very
moist sub-tropical flow will overlap the northern coastal waters
through early this week. A warm frontal boundary connected to this
moist flow will approach the coastal waters today and become nearly
stationary while another warm front to the southwest advances toward
it and the bay area. By late week into early next week a cold front
will move southeastward over the coastal waters. Seas are expected
to remain light to moderate through the first part of next week.

Mtr watches warnings advisories
Tday None.

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

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Wind Forecast for San Francisco/Monterey Bay Area, CA (8,2,3,4)
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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.