Saturday, July20, 2019

Marine Weather and Tides
Point Arena, CA

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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 6:02AMSunset 8:29PM Saturday July 20, 2019 3:51 PM PDT (22:51 UTC) Moonrise 10:16PMMoonset 8:46AM Illumination 85% Phase: Waning Gibbous; Moon at 19 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 202059
area forecast discussion
national weather service san francisco bay area
159 pm pdt Sat jul 20 2019

Synopsis A deep marine layer will maintain cooler than average
temperatures today, especially inland. A warming trend will begin
on Sunday and continue through the middle of next week as high
pressure centered over the four corners area builds westward into

Discussion As of 02:00 pm pdt Saturday... A weakening coastal
trough is continuing to bring southerly flow along the coast this
afternoon. This has prevented clouds from fully clearing out of
parts of sonoma and marin counties but expect clouds to continue
decreasing early this afternoon. Elsewhere, stratus has retreated
to the coast with mostly sunny skies. Temperatures are down
several degrees versus 24 hours ago at most locations due to
clouds lingering into the late morning and early afternoon. The
biggest decrease in temperatures are in the north bay, east bay,
and south bay where temps are as much as 5-10 degrees below this
time yesterday. This will result in highs several degrees below
yesterday's observed highs in these locations. Elsewhere, high
temperatures will be similar to yesterday.

Northwesterly flow is expected to replace southerly flow along the
coast over the next 24 hours as the offshore surface trough
weakens. An upper ridge will develop over the four corners region
on Sunday and begin to expand northwestward over california
through next week. This will act to compress the marine layer,
and less inland intrusion of stratus can be expected in the coming
days. The building ridge will also begin a warming trend that
will last through the middle of next week. 850 mb temperatures
will begin at about 20c today and are forecast to warm
approximately a degree c each day Sunday through Wednesday. Most
of the warming at the surface will be felt at inland locations,
with highs rising a few degrees each day. Inland valleys are
expected to reach the 80s and 90s, with the hottest locations
reaching the upper 90s to lower 100s by the middle of next week,
an upper trough will move off the coast early next week and will
prevent the ridge from building more strongly across california.

Cool onshore flow is expected to prevail, and only slight warming
is expected at coastal locations. Coastal highs through next week
are forecast to remain in the 60s and 70s.

Late next week, ensembles depict the upper trough lifting to the
north and the four corners high gradually shifting westward,
becoming centered over the desert southwest next weekend. This
would result in further warming of inland areas, while continued
onshore flow keeps coastal areas cool.

Aviation As of 10:28 am pdt Saturday... For 18z tafs. A marine
layer in excess of 2500 ft has led to more widespread stratus
coverage with both ksjc and klvk seeing bkn CIGS into this
morning. Satellite imagery shows low clouds dissipating over land.

Vfr conditions expected for this afternoon before MVFR ifr cigs
return this evening. Generally light winds this morning becoming
onshore and breezy this afternoon 10-15 kt with locally higher
gusts at ksfo.

Vicinity of ksfo...VFR conditions prevailing before stratus
returns this evening. Light southerly winds this morning to turn
onshore by the afternoon. Expect westerly winds gusting to 20-25
kt after 21z-22z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Satellite imagery shows stratus clearing
towards the bay. May see MVFR CIGS hang on at kmry until 19z-20z.

Vfr conditions this afternoon before low clouds return early this
evening. Generally light winds this morning turning onshore and
increasing to 10-15 kt this afternoon.

Marine As of 08:18 am pdt Saturday... Split flow will continue
today and tomorrow with light southerly winds along the coast and
more moderate northwest winds over the outer waters. Locally gusty
winds will continue today across the northern outer waters and
over the northern san francisco bay. Winds will shift back out of
the northwest Sunday.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm until 3 am
sca... Sf bay until 9 pm
public forecast: st
aviation: as
marine: as
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Wind Forecast for San Francisco/Monterey Bay Area, CA (18,4,5,8)
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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 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.