Friday, August23, 2019 L-36.com


Marine Weather and Tides
Los Gatos, CA

Version 3.4
NOTICE
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 L-36.com. Allen

Sunrise 6:29AMSunset 7:51PM Friday August 23, 2019 3:47 AM PDT (10:47 UTC) Moonrise 11:32PMMoonset 1:03PM Illumination 46% Phase: Third Quarter Moon; Moon at 23 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 249 Am Pdt Fri Aug 23 2019
Today..W winds 5 to 10 kt, becoming sw 10 to 15 kt this afternoon. NW swell 6 to 7 ft at 9 seconds and sw around 2 ft at 17 seconds.
Tonight..S winds 5 to 10 kt. NW swell 4 to 6 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat..SW winds 5 to 10 kt. NW swell 3 to 4 ft at 11 seconds and sw around 2 ft at 16 seconds.
Sat night..W winds around 5 kt. Wind waves 2 to 3 ft. W swell 2 to 3 ft at 12 seconds and sw around 2 ft at 15 seconds.
Sun..W winds 10 to 15 kt. Wind waves 1 to 2 ft. Mixed swell W 2 to 3 ft at 12 seconds and S 2 to 3 ft at 15 seconds.
Sun night..NW winds 5 to 10 kt. Mixed swell nw 3 to 4 ft at 12 seconds and S 2 to 4 ft at 14 seconds.
Mon..W winds 5 to 10 kt. Mixed swell nw 3 to 5 ft and S 2 to 3 ft.
Tue..SW winds 5 to 10 kt. Mixed swell nw 2 to 4 ft and S 2 to 3 ft.
PZZ500 249 Am Pdt Fri Aug 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will decrease across the area today but remain breezy over the northern outer waters. Steep northwesterly swell at 8 to 10 seconds will decrease today through the weekend with period becoming 7 to 8 seconds over the weekend. A coastally trapped southerly wind reversal will lead to light southwesterly winds over the waters this weekend. A moderate southerly swell will arrive on Sunday through early next week with light northwesterly swell continuing through the period.


7 Day Forecast for Marine Location Near Los Gatos, CA
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location: 37.24, -121.95     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 231038
afdmtr
area forecast discussion
national weather service san francisco bay area
338 am pdt Fri aug 23 2019

Synopsis A shallow marine layer along the coast with onshore
winds will bring seasonable temperatures to the bay area today.

High pressure begins to strengthen and rebuild over the state this
weekend allowing for inland areas to warm back into the 90s.

Milder conditions will persist near the coast with a shallow
marine layer. The ridge will weaken slightly by Tuesday and
Wednesday as the remnants of tropical storm ivo pass west of the
golden gate. This may bring some increasing clouds and more
humidity to the region.

Discussion As of 3:38 am pdt Friday... 24 hour temps and
humidity trends are noteworthy this morning with dewpoints running
5-10 degrees drier than yesterday at this time with readings back
down into the 50s while temps hover in the lower 60s. The moist
airmass has been pushed south of our region per the latest tpw
satellite scans. A more typical summertime regime is returning to
the bay area and central coast. A shallow 500-1000 foot marine
layer is hugging the coast from the golden gate southward to big
sur. Cloud bases are shallow from 400-600 feet from half moon bay
to the monterey bay region. There is steady onshore pressure
gradients in place with about 2 mb sfo to sacramento allowing the
cooler marine air to ooze inland. The 850 mb temps are around 22
celsius this afternoon which should keep the warmest inland areas
in the lower 90s while 70s 80s persist around the bay with 60s for
the beaches.

A broad 594 dm ridge is forecast to build on Saturday, extending
from the eastern pacific, across california and all the way
towards arizona. This will bring some more inland warming with mid
and upper 90s returning to the inland valleys by Sunday and Monday
as 850 mb temps warm to around 25 celsius. The surface onshore
gradients will remain fairly light with the thermal trough trying
to hug the coastline night and morning hours. Given the strength
of the ridge dont expect the marine layer to deepen too much
through the weekend and into early next week. There will likely be
bouts of morning dense fog near the coast and coastal slopes that
the marine layer covers as it gets squashed by the warm upper
ridge. Locations in the hills above 1500 feet will likely see
little night time variation with warm and dry weather persisting
day and night right through early next week.

In general the pattern the next few days looks to be fairly
typical but inland highs look to be about 4-8 degrees warmer than
normal due to the strong ridge and expected lighter afternoon
seabreezes.

Perhaps the most interesting forecast item to watch will be as the
remnants of tropical storm ivo shift northward by early next week.

The models have been fairly consistent in bringing the remnant
upper level disturbance west of the golden gate by about next
weds. We should see some increasing high clouds as early as
Tuesday night and feel some higher dewpoint air getting ushered in
under a gentle southerly flow.

Conceptually the pattern screams watch out as the tropical
remnants push north and bump up against the previously mentioned
stout upper ridge. As this occurs a mid-latitude trough will be
crossing the east pac and approaching from the northwest. This
will induce a negatively tilted upper trough. For days now the
models have been consistent in not really showing much moisture or
instability over our region. This should be viewed with some
skepticism. At this time its clear that the areas from mendocino
northward up towards mt shasta and modoc as well as much of oregon
look to see much better chances for t-storms as diffluent flow
aloft will develop. The latest 06z GFS implies a large t-storm
outbreak later weds night up near the oregon border. Will need to
watch all these trends closely in the coming days.

Aviation As of 11:14 pm pdt Thursday...VFR except vlifr-ifr
along the coast, extending eastward over the san francisco bay,
and also moving into nearby coastal valleys tonight and Friday
morning. On Friday diurnal mixing should lift ceilings toVFR at
most, mainly inland, terminals, however in terms of areal coverage
of coastal stratus and fog it's a very low confidence forecast for
Friday into Saturday morning; a 4 mb smx-sfo pressure gradient
and wind will be juxtaposed to a diminishing 3 mb or less acv-sfo
pressure gradient and wind resulting in any combination of coverage.

Vicinity of ksfo...VFR, west wind has diminished. Seeing signs that
the aforementioned smx-sfo pressure gradient is getting a foothold
(usually the NAM is slow with this forecast). Under a compressed
marine layer this combination should keepVFR going for the period.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Vlifr-ifr due to increasing stratus and
fog coverage extending into the salinas valley. Low ceilings and
visibilities lift toVFR by late Friday morning, then low confidence
stratus and fog return Friday evening and night.

Marine As of 03:10 am pdt Friday... Northwest winds will
decrease across the area today but remain breezy over the northern
outer waters. Steep northwesterly swell at 8 to 10 seconds will
decrease today through the weekend with period becoming 7 to 8
seconds over the weekend. A coastally trapped southerly wind
reversal will lead to light southwesterly winds over the waters
this weekend. A moderate southerly swell will arrive on Sunday
through early next week with light northwesterly swell continuing
through the period.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm until 9 am
sca... Sf bay from 9 am
public forecast: rww
aviation: st
marine: st
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 23 mi53 min W 2.9 G 2.9 63°F 75°F1007.4 hPa
ELXC1 - Elkhorn Slough Reserve, CA 31 mi62 min SSW 6 58°F 1006 hPa58°F
MLSC1 - Moss Landing, South Harbor, CA 31 mi28 min SSW 5.1 G 17 58°F 1008.2 hPa58°F
46092 - MBM1 34 mi37 min W 5.8 57°F 57°F1007.7 hPa (+0.0)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 39 mi57 min 9.7 G 12 59°F 58°F8 ft1007 hPa (-0.5)
AAMC1 - 9414750 - Alameda, CA 41 mi53 min W 4.1 G 6 63°F 72°F1007.4 hPa
46114 - West Monterey Bay, CA 42 mi47 min 58°F8 ft
46240 - Cabrillo Point, Monterey Bay, CA (158) 42 mi47 min 60°F3 ft
LNDC1 42 mi47 min SW 4.1 G 5.1 63°F 1006.8 hPa (-0.6)
MEYC1 44 mi71 min 61°F1007.8 hPa
OBXC1 44 mi47 min 63°F 61°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 44 mi47 min SW 4.1 G 6 62°F 1006.8 hPa (-0.6)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 44 mi53 min SW 8 G 8.9
PXOC1 - 9414311 - San Francisco (Pier 1), CA 45 mi53 min W 5.1 G 6 61°F 1005.8 hPa
PXSC1 46 mi47 min 62°F 58°F
FTPC1 - 9414290 - San Francisco, CA 48 mi53 min SW 5.1 G 8 59°F 64°F1007.2 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA9 mi1.9 hrsNW 310.00 miFair64°F59°F84%1006.8 hPa
Mountain View, Moffett Field, CA14 mi3.9 hrsN 510.00 miFair66°F59°F78%1007.8 hPa
Watsonville, Watsonville Municipal Airport, CA22 mi1.9 hrsN 07.00 miOvercast59°F55°F90%1007.5 hPa

Link to 5 minute data for KSJC

Wind History from SJC (wind in knots)
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Last 24hrN3CalmN3W3--NW4Calm3N8NW4NW8NW10NW11NW14NW10------NW8--NW5--NW3Calm
1 day agoCalmCalm----S3CalmCalmCalm6--NW10NW12N13NW14N11N12--N10N10--NE5N4--NW3
2 days agoNW6NW4NW6W5NW7W5N5N54N13
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G23
----------------SW3

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
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Fri -- 02:09 AM PDT     1.54 feet Low Tide
Fri -- 06:30 AM PDT     Sunrise
Fri -- 07:30 AM PDT     6.32 feet High Tide
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 01:38 PM PDT     2.79 feet Low Tide
Fri -- 02:03 PM PDT     Moonset
Fri -- 06:58 PM PDT     9.21 feet High Tide
Fri -- 07:49 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.71.91.51.92.94.35.56.26.35.85.14.23.42.92.83.65.27.18.69.28.98.16.85.2

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Fri -- 01:50 AM PDT     0.00 knots Slack
Fri -- 04:20 AM PDT     0.80 knots Max Flood
Fri -- 06:30 AM PDT     Sunrise
Fri -- 07:42 AM PDT     -0.00 knots Slack
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 11:31 AM PDT     -0.56 knots Max Ebb
Fri -- 01:14 PM PDT     0.00 knots Slack
Fri -- 02:04 PM PDT     Moonset
Fri -- 04:16 PM PDT     0.76 knots Max Flood
Fri -- 07:11 PM PDT     -0.00 knots Slack
Fri -- 07:50 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.30.10.50.80.70.60.3-0.1-0.3-0.4-0.5-0.5-0.10.20.50.70.70.40.1-0.2-0.5-0.7-0.9

Weather Map and Satellite Images
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (6,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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Disclaimer:
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 L-36.com. 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 L-36.com 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.