Monday, May29, 2017 L-36.com


Marine Weather and Tides
Moss Beach, CA

Version 3.4
What's New / NOTES
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 5:49AMSunset 8:25PM Monday May 29, 2017 2:05 PM PDT (21:05 UTC) Moonrise 9:04AMMoonset 11:22PM Illumination 19% Phase: Waxing Crescent; Moon at 4 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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PZZ545 Point Reyes To Pigeon Point To 10 Nm- 829 Am Pdt Mon May 29 2017
.small craft advisory in effect through late Tuesday night...
Today..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 ft at 10 seconds. Patchy fog late in the morning. Patchy drizzle late in the morning.
Tonight..NW winds 20 to 30 kt. Wind waves 4 to 6 ft. NW swell 3 ft at 10 seconds. Patchy drizzle after midnight.
Tue..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 ft at 10 seconds. Patchy drizzle in the morning.
Tue night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 ft at 11 seconds. Slight chance of showers after midnight.
Wed..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 3 to 4 ft at 12 seconds. Patchy fog after midnight.
Thu..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 3 to 4 ft. Patchy fog.
Fri..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 3 to 4 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 2 to 4 ft with a dominant period of 10 seconds. Across the bar...combined seas 3 to 5 ft with a dominant period of 10 seconds. Maximum ebb current of 1 knots at 07:18 pm Monday and 1.8 knots at 06:42 am Tuesday.
PZZ500 829 Am Pdt Mon May 29 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gusty northerly winds will continue over the coastal waters and eventually over the bays today as the surface pressure gradient tightens. Steep winds waves and fresh swell will cause rough and hazardous seas. Winds will decrease mid week as a weak frontal system moves through the coastal waters.

7 Day Forecast for Marine Location Near Moss Beach, CA
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location: 37.51, -122.56     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 292101
afdmtr
area forecast discussion
national weather service san francisco bay area
201 pm pdt Mon may 29 2017

Synopsis Continued seasonably cool and breezy through midweek
with a slight chance of showers late Tuesday night into Wednesday
as an upper trough moves through. A drying and warming trend
Thursday into next weekend.

Discussion As of 2:01 pm pdt Monday... Low clouds were slow to
clear this morning and now some high clouds continue to filter
overhead while marine clouds persist from san francisco to
monterey. This has kept memorial day temperatures on the cool side
of normal so far but with filtered sunshine expect a few more
degrees of warming this afternoon. Onshore gradient remains
moderate around 3 mb with 21 mph winds observed at the golden
gate.

Synoptic pattern features an upper trough that will keep moderate
onshore winds in place overnight into Tuesday with low clouds
expected to reform and surge inland overnight.

Not expecting big changes for Tuesday but the stage will be set
for another breezy day around the bay. NAM 925 mb winds will
increase through the afternoon and evening hours in response to
the incoming trough. Will be expecting some morning drizzle with
this pattern on Tuesday morning followed by gusty westerly winds
through the afternoon evening hours.

Have kept slight chance of showers in the forecast late Tuesday
night into weds as trough axis passes through. Not expecting
anything more than some hit or miss showers.

The pattern will begin to transition by weds night and expect
modest warming and drying Thursday and into next weekend as high
pressure rebuilds. Surface gradients look to remain moderate so
expect breezy afternoons as we finish may and head into june.

Aviation 10:49 am pdt Monday for 18z tafs... Current visible
satellite loop still shows widespread low clouds over the region,
though some clearing can be detected through the salinas valley,
east bay hills, and parts of the north bay. Questions remain with
exact timing of the marine layer clouds scattering and or
clearing. Anticipate inland terminals, such as sns, sts, and sjc,
to scatter out in the next hour or two (by 20z). Even still,
confidence is low. And as stated in previous aviation discussion,
the immediate coast may not clear at all. Westerly winds pick up
later this morning afternoon. CIGS return tonight.

Vicinity of ksfo... Ifr MVFR CIGS through 20z, perhaps later for
sfo. Kept CIGS in the TAF until 2030z for sfo, but even that may
be a bit optimistic. Kept in strong west winds this afternoon, 15
to 20 kt, with gusts up to 25 or 30 kt. CIGS return early
tonight. Low confidence on cig timing.

Sfo bridge approach... CIGS will likely clear over the approach
before terminal, if clearing occurs at all.

Monterey bay terminals... Ifr CIGS locked in for at least the next
few hours. CIGS will eventually lift, but remain bkn-ovc over mry.

Clearing may occur over sns by 1930z-20z, low confidence on exact
timing. Winds will increase this afternoon out of the west at 10
to 20 kt, occasionally gusty. CIGS likely return early tonight.

Marine As of 01:51 pm pdt Monday... Gusty northerly winds will
continue over the coastal waters and eventually over the bays
today as the surface pressure gradient tightens. Steep winds waves
and fresh swell will cause rough and hazardous seas. Winds will
decrease mid week as a weak frontal system moves through the
coastal waters.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pt reyes 0-10 nm
sca... Pt reyes to pigeon pt 0-10 nm
sca... Pigeon pt to pt pinos 0-10 nm
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm
sca... Mry bay
sca... Sf bay
public forecast: rww
aviation: bam
marine: bam
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 18 mi65 min W 13 G 16 58°F 66°F1015.3 hPa (-0.9)
46237 - San Francisco Bar, CA (142) 19 mi65 min 56°F5 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 20 mi75 min NW 16 G 18 54°F 53°F7 ft1016.4 hPa (+0.0)
FTPC1 - 9414290 - San Francisco, CA 21 mi65 min WSW 8 G 15 55°F 59°F1015.7 hPa (-0.6)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi65 min WSW 7 G 13 56°F 1014.8 hPa
PXSC1 22 mi65 min 57°F 51°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi75 min NW 16 G 19 53°F 52°F6 ft1016.1 hPa (-0.3)
AAMC1 - 9414750 - Alameda, CA 23 mi65 min WSW 6 G 9.9 55°F 63°F1016.5 hPa (-0.3)
OBXC1 23 mi65 min 55°F 52°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi65 min WSW 12 G 14
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi65 min W 5.1 G 8 57°F 1015.9 hPa (-0.3)
LNDC1 25 mi65 min WSW 7 G 9.9 56°F 1015.9 hPa (-0.4)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi63 min SSW 2.9 60°F 1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi65 min S 19 G 21 57°F 1015.7 hPa (-0.5)
RCMC1 - 9414863 - Richmond, CA 30 mi65 min SSE 8.9 G 13 57°F 60°F1014.9 hPa (-0.7)
PRYC1 - 9415020 - Point Reyes, CA 40 mi65 min WNW 19 G 24 55°F 50°F1015.9 hPa (-0.0)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi65 min WSW 12 G 15 62°F 1014.2 hPa (-1.1)
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi65 min WNW 14 G 16 64°F 65°F1014.2 hPa (-1.1)56°F
UPBC1 43 mi65 min WNW 13 G 16
PCOC1 - 9415144 - Port Chicago, CA 47 mi47 min WSW 8.9 G 13 66°F 65°F1013.7 hPa

Wind History for Redwood City, CA
(wind in knots)    EDIT      (on/off)   Help
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G17

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi70 minNNW 76.00 miFog/Mist54°F50°F88%1016.9 hPa
San Francisco, San Francisco International Airport, CA13 mi69 minW 16 G 2410.00 miOvercast58°F48°F72%1016.1 hPa
San Carlos Airport, CA16 mi78 minWSW 13 G 1810.00 miMostly Cloudy59°F50°F72%1015.9 hPa
Oakland, Metro Oakland International Airport, CA22 mi72 minW 1010.00 miOvercast59°F52°F78%1016.2 hPa
Palo Alto Airport, CA23 mi2.3 hrsN 1010.00 miMostly Cloudy61°F55°F83%1015.9 hPa

Wind History from HAF (wind in knots)
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Last 24hrNW10NW10NW11NW11NW11NW10NW10NW11
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1 day agoNW7W7NW8NW9NW10NW10NW10NW10N9N7NW10NW7N8NW9NW9NW8N5NW6N7NW9NW9NW8NW10NW10
2 days agoSE6S7S7SW5SW5SW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW3CalmSW4W3S4W3W5W6

Tide / Current Tables for Princeton, Half Moon Bay, California
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Princeton
Click for Map
Mon -- 01:14 AM PDT     5.83 feet High Tide
Mon -- 05:51 AM PDT     Sunrise
Mon -- 08:16 AM PDT     -1.38 feet Low Tide
Mon -- 10:04 AM PDT     Moonrise
Mon -- 03:26 PM PDT     4.77 feet High Tide
Mon -- 08:23 PM PDT     Sunset
Mon -- 08:36 PM PDT     2.48 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.45.85.74.93.51.80.3-0.9-1.4-1.2-0.50.61.93.14.24.74.74.23.62.92.52.52.93.5

Tide / Current Tables for Sierra Point 1.3 mi ENE, South San Francisco Bay, California Current
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Sierra Point 1.3 mi ENE
Click for Map
Mon -- 12:29 AM PDT     0.85 knots Max Flood
Mon -- 03:20 AM PDT     -0.00 knots Slack
Mon -- 05:50 AM PDT     Sunrise
Mon -- 06:58 AM PDT     -1.58 knots Max Ebb
Mon -- 10:03 AM PDT     Moonrise
Mon -- 10:24 AM PDT     0.00 knots Slack
Mon -- 01:39 PM PDT     1.23 knots Max Flood
Mon -- 05:15 PM PDT     -0.01 knots Slack
Mon -- 07:44 PM PDT     -0.75 knots Max Ebb
Mon -- 08:23 PM PDT     Sunset
Mon -- 10:37 PM PDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.80.60.2-0.4-0.9-1.4-1.6-1.4-0.9-0.30.40.91.21.210.70.1-0.4-0.7-0.7-0.5-0.20.1

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 (17,4,5,8)
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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.