Monday, May22, 2017 L-36.com


Marine Weather and Tides
La Honda, CA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 5:51AMSunset 8:18PM Monday May 22, 2017 10:35 AM PDT (17:35 UTC) Moonrise 3:01AMMoonset 3:49PM Illumination 9% Phase: Waning Crescent; Moon at 27 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 Pigeon Point To Point Pinos To 10 Nm- 902 Am Pdt Mon May 22 2017
Today..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 9 seconds. Patchy fog in the morning.
Tonight..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 ft at 9 seconds. Patchy fog after midnight.
Tue..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 ft at 9 seconds. Patchy fog in the morning.
Tue night..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 ft at 9 seconds. Patchy fog after midnight.
Wed..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft at 10 seconds. Patchy fog in the morning.
Thu..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 4 ft.
Fri..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft.
PZZ500 902 Am Pdt Mon May 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure building over the pacific northwest will maintain light to moderate northwesterly winds through midweek. Winds will increase midweek as a thermal trough develops along the coast tightening the pressure gradients over the northern outer waters. Strongest winds are expected over the outer waters while the inner waters remain mostly light.

7 Day Forecast for Marine Location Near La Honda, CA
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location: 37.3, -122.29     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 221511
afdmtr
area forecast discussion
national weather service san francisco bay area
811 am pdt Mon may 22 2017

Synopsis High pressure will maintain very warm and dry
conditions for inland areas through today. A shallow marine layer
and weak seabreeze will keep the coast seasonably cool. A cooling
trend is expected regionwide from Tuesday through Friday. Warming
is then expected for inland areas during the upcoming weekend.

Discussion As of 8:00 am pdt Monday... A boost in the depth of
the marine layer combined with a more pronounced onshore flow lead
to widespread clouds and patchy fog along the coast plus into the
salinas valley. Clouds are expected to burn back to the coast
later this morning. However, big question remains if sunshine will
make it to the coast or not. Will monitor conditions and provide
an update to the forecast if necessary.

Otherwise, main story for the week will be cooler conditions over
the next several days as the ridge of high pressure flattens out
as a low dives down from the northwest. Temperatures will start to
rebound by the weekend as a weak ridge rebuilds into our region.

Previous discussion An upper level ridge remains centered
along the west coast early this morning... Maintaining a warm
airmass across inland areas. However, the marine layer is deeper
this morning (about 1200 feet deep at fort ord) and onshore
pressure gradients are slightly greater. The result will be more
widespread morning low clouds and fog near the ocean and locally
into the coastal valleys, and cooler daytime temperatures in these
areas as well. Inland areas that remain isolated from the effects
of the marine layer will continue to be very warm today.

The upper level ridge is forecast to weaken on Tuesday and then
completely break down by Wednesday as an upper trough currently in
the gulf of alaska drops southeast and into the western united
states. These developments will result in robust cooling across
our entire region, especially inland, from Tuesday through
Thursday. Daytime highs will cool by as much as 20 degrees by
midweek. In addition, night and morning low clouds will be much
more widespread and persistent by midweek.

The upper trough will shift east by the weekend, allowing an upper
ridge to redevelop near the west coast. Modest warming is expected
inland over the weekend. However, moderate onshore flow will limit
weekend warming potential near the coast.

Aviation As of 4:35 am pdt Monday... For 12z tafs. The marine
layer persist at around 1200 ft this morning which allowed some
inland penetration of stratus overnight across the north bay and
down the salinas valley. Aside from widespread coastal status and
patchy fog... Mainly clear skies prevail over the interior. Low
clouds will push back to the coast by noon today making way for
clear skies through this afternoon over coastal terminals and late
tonight for the inland terminals. Winds will remain light through
the morning then increase this afternoon with the onset of the
seabreeze.

Vicinity of ksfo...VFR conditions expected to prevail through the
day however a slight chance of ifr CIGS this morning remains
possible but confidence remains low. Winds will remain light and
locally variable through the morning then increase this afternoon
with the onset of the seabreeze.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Lifr/vlifr CIGS expected through the
early morning with clearing expected around 15z-16z. Winds will
remain light and locally variable through the morning then
increase this afternoon with the onset of the seabreeze.

Marine As of 2:19 am pdt Monday... Light northwesterly winds
and seas will prevail through the first half of the work week as
high pressure persists over the eastern pacific. Northerly wind
and seas will increase midweek as a thermal trough develops along
the coast tightening the pressure gradients over the northern
outer waters. Strongest winds are expected over the outer waters
while the inner waters remain mostly light.

Mtr watches/warnings/advisories
Tday None.

Public forecast: bell/dykema
aviation: cw
marine: cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 15 mi60 min NNE 2.9 G 5.1 58°F 68°F1015.1 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 32 mi106 min WNW 3.9 G 5.8 51°F 53°F4 ft1015.4 hPa (+0.8)
AAMC1 - 9414750 - Alameda, CA 33 mi60 min SW 2.9 G 4.1 56°F 64°F1016.2 hPa
LNDC1 34 mi60 min WSW 2.9 G 5.1 56°F 1015.7 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 35 mi60 min Calm G 1
PXOC1 - 9414311 - San Francisco (Pier 1), CA 35 mi60 min ENE 2.9 G 4.1 55°F 1014.6 hPa
PXSC1 35 mi60 min 57°F 53°F
OBXC1 35 mi60 min 55°F 53°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 35 mi60 min NNW 2.9 G 4.1 55°F 1015.8 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 36 mi46 min 53°F 54°F5 ft1016 hPa (+0.9)
FTPC1 - 9414290 - San Francisco, CA 36 mi60 min W 4.1 G 8 51°F 53°F1016.2 hPa
46237 - San Francisco Bar, CA (142) 38 mi66 min 55°F4 ft
46092 - MBM1 40 mi89 min W 3.9 50°F 55°F1015.8 hPa (+1.5)
46114 - West Monterey Bay, CA 40 mi66 min 53°F5 ft
TIBC1 - Tiburon Pier, San Francisco Bay, CA 42 mi49 min SSE 9.9 56°F 1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 42 mi60 min SSW 8.9 G 13 54°F 1016 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 43 mi106 min SSW 3.9 G 5.8 50°F 54°F4 ft1015.8 hPa (+1.1)
RCMC1 - 9414863 - Richmond, CA 44 mi60 min S 5.1 G 7 55°F 58°F1015.5 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Palo Alto Airport, CA15 mi49 minN 710.00 miA Few Clouds63°F57°F83%1015.6 hPa
Mountain View, Moffett Field, CA16 mi1.7 hrsNNW 510.00 miA Few Clouds62°F55°F80%1015.7 hPa
San Carlos Airport, CA16 mi46 minVar 47.00 miPartly Cloudy with Haze59°F55°F88%1015.9 hPa
Half Moon Bay Airport, CA18 mi41 minS 56.00 miFog/Mist54°F50°F88%1016.3 hPa
San Jose, San Jose International Airport, CA20 mi43 minVar 39.00 miFair67°F55°F68%1015.1 hPa
San Francisco, San Francisco International Airport, CA22 mi40 minNNE 610.00 miA Few Clouds60°F52°F75%1015.4 hPa

Wind History from PAO (wind in knots)
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Last 24hrN6N10--N10N12NW14NW14NW14NW12NW120NW8------------------W6NW54N7
1 day agoN5N10N8NW10NW9N15N15NW12NW12NW11NW10------------------W5------
2 days agoNE5--NW7N8NW10NW14NW12NW12N15N14NW8------------------W5NW5N5N5

Tide / Current Tables for Ano Nuevo Island, California
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Ano Nuevo Island
Click for Map
Mon -- 02:24 AM PDT     0.51 feet Low Tide
Mon -- 04:00 AM PDT     Moonrise
Mon -- 05:55 AM PDT     Sunrise
Mon -- 08:24 AM PDT     3.68 feet High Tide
Mon -- 02:07 PM PDT     0.84 feet Low Tide
Mon -- 04:48 PM PDT     Moonset
Mon -- 08:16 PM PDT     Sunset
Mon -- 08:27 PM PDT     5.25 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.70.90.50.61.11.82.63.23.63.63.22.51.71.10.81.11.82.73.84.75.25.24.63.5

Tide / Current Tables for Dumbarton Bridge, San Francisco Bay, California Current
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Dumbarton Bridge
Click for Map
Mon -- 02:10 AM PDT     -1.35 knots Max Ebb
Mon -- 03:59 AM PDT     Moonrise
Mon -- 05:29 AM PDT     0.00 knots Slack
Mon -- 05:53 AM PDT     Sunrise
Mon -- 08:33 AM PDT     1.60 knots Max Flood
Mon -- 12:09 PM PDT     -0.00 knots Slack
Mon -- 02:29 PM PDT     -1.09 knots Max Ebb
Mon -- 04:47 PM PDT     Moonset
Mon -- 05:25 PM PDT     0.00 knots Slack
Mon -- 08:16 PM PDT     Sunset
Mon -- 08:40 PM PDT     1.75 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.4-1.1-1.3-1.2-0.9-0.30.41.11.51.61.30.80.1-0.6-1-1-0.7-0.30.41.11.61.71.40.9

Weather Map and Satellite Images
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Weather Map
wmap_P
IR Satellite Image from GEOS
west_satellite

GOES Local Image of CentralWestCoast    EDIT
Geos

Wind Forecast for San Francisco/Monterey Bay Area, CA (13,3,4,5)
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Ground Weather Radar Station San Francisco Bay Area, CA
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weather_mapweather_map weather_map

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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.