Friday, April26, 2019 L-36.com


Marine Weather and Tides
Moss Beach, CA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:18AMSunset 7:56PM Friday April 26, 2019 1:34 AM PDT (08:34 UTC) Moonrise 1:12AMMoonset 11:16AM Illumination 57% Phase: Waning Gibbous; Moon at 22 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 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 930 Pm Pdt Thu Apr 25 2019
Tonight..W winds 5 to 15 kt...becoming 5 to 10 kt after midnight. Wind waves 2 ft or less. NW swell 3 to 4 ft at 11 seconds.
Fri..W winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 11 seconds.
Fri night..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 4 to 6 ft at 10 seconds.
Sat..W winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds.
Sat night..W winds 5 to 15 kt. Wind waves around 3 ft. NW swell 3 to 5 ft at 10 seconds.
Sun..S winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 11 seconds.
Sun night..S winds up to 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft at 11 seconds.
Mon..SW winds up to 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
Tue..W winds 5 to 15 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 4 to 6 ft with a dominant period of 10 seconds. Across the bar...combined seas 5 to 7 ft with a dominant period of 10 seconds. Maximum ebb current of 1.1 kt at 11:01 pm Thursday and 1.7 kt at 09:49 am Friday.
PZZ500 930 Pm Pdt Thu Apr 25 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure off the pacific northwest will keep gusty northwest winds going over the northern waters through tomorrow night with generally light to moderate northerly winds expected elsewhere. High pressure off the pacific northwest will merge with a high spanning alaska to the northwest territories over the weekend and early next week, the strongest winds will become confined to the northern outer coastal california waters. Light to moderate northwest swell will persist through the forecast period.


7 Day Forecast for Marine Location Near Moss Beach CDP, 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 260455
afdmtr
area forecast discussion
national weather service san francisco bay area
955 pm pdt Thu apr 25 2019

Synopsis Areas of night and morning low clouds will continue
into the upcoming weekend. Little change is expected in
temperatures on Friday, but gradual cooling will occur inland over
the weekend and into early next week. A weak disturbance passing
through southern california will bring clouds and possibly
isolated showers south of monterey this late this weekend.

Otherwise, dry weather is forecast through the the weekend and
well into next week.

Discussion As of 8:45 pm pdt Thursday... Development of a
marine layer along the coast last night, coupled with increased
onshore flow today, resulted in widespread cooling across our
region today. Some locations were as much as 15 degrees cooler
today compared to Wednesday.

An upper ridge remains centered over california this evening. Goes
west water vapor satellite imagery shows a weak shortwave trough
off the coast of the pacific northwest, moving to the east. This
disturbance is forecast to move inland well to our north late
tonight and weaken the upper ridge slightly. However, very little
airmass cooling is forecast and onshore flow is expected to weaken
slightly on Friday as surface high pressure builds more strongly
to our north. So the net result will be little change in
temperatures from today, and some locations could even warm a bit.

A marine layer, with a depth of about 1500 feet, is expected to
persist in coastal areas, although the latest local WRF model
indicates drier air making its way into the low levels by
tomorrow. So, we could see some clearing of low clouds in coastal
areas by afternoon.

Onshore flow is projected to strengthen slightly by Saturday
which should result in modest cooling. We may also see an increase
in high clouds on Saturday out ahead of a weak upper low that
will be approaching the southern california coast. But otherwise
no significant changes are anticipated through Saturday. Cooling
will likely become more pronounced on Sunday as the upper low
draws closer to southern california and the ridge weakens over our
area. The low is forecast to move inland near san diego by late
Sunday night or Monday morning and it may be close enough to
generate isolated showers across areas south of monterey on Sunday
night and Monday.

By early next week an upper trough is forecast to deepen from
western canada south across the pacific northwest and the northern
rockies. This trough will be dry and its main impact will be to
bring a cooler airmass into california, allowing the cooling
trend to continue across our area, especially inland, during the
first half of next week. Temperatures are forecast to cool by as
much as 15 degrees from Sunday to Tuesday. But even with this
projected cooling, temperatures are only forecast to decrease to
levels near, or slightly below, seasonal averages.

Aviation As of 9:55 pm pdt Thursday... The marine layer depth
varies from 1,000 to 1,500 feet per recent profiler data. Some
amplification of the 500 mb height ridge is anticipated Friday,
but in response the 18z 00z NAM generally forecasts less than 2
celsius temperature changes at 925 mb and 850 mb levels tonight
into Friday which supports a mainly persistence forecast; i.E.

Little change in the marine layer depth is anticipated through the
period. Onshore winds will usher stratus and fog inland tonight
and Friday morning, but a compressed marine layer should limit
areal coverage over the bay area. At the present time ifr-lifr
ceilings have reached inland into sonoma valley, east through the
golden gate over the san francisco bay to oakland berkeley, and
into the salinas valley. Elsewhere METAR observations indicateVFR.

On Friday coastal ifr in the morning will mix out through typical
diurnal warming and mixing, mainlyVFR is forecast inland. Patchy
ifr may linger along the immediate coast from late morning through
afternoon. The NAM forecasts a slight increase in acv-sfo pressure
gradient Friday. Low confidence if how marine stratus fog returns
inland Friday night into Saturday, inland arrival could be delayed
somewhat if the northerly pressure gradient strengthens. Sfo-sac
gradient should be about the same as it is this afternoon, approx
3 mb.

Vicinity of ksfo...VFR, west wind has diminished to near 10 knots.

Tempo MVFR ceiling 12z-16z Friday.VFR with gusty west to northwest
wind redeveloping Friday afternoon and evening.

Sfo bridge approach... Same as ksfo.

Monterey bay terminals... Ifr ceilings tonight and Friday morning,
vfr Friday late morning and afternoon. West winds 5 to 10 knots
tonight and Friday morning, 10 to 15 knots with a few gusts to 20
knots possible Friday afternoon and early evening. Patchy stratus
and fog probably returning late Friday afternoon and early evening.

Marine As of 9:33 pm pdt Thursday... High pressure off the
pacific northwest will keep gusty northwest winds going over the
northern waters through tomorrow night with generally light to
moderate northerly winds expected elsewhere. High pressure off the
pacific northwest will merge with a high spanning alaska to the
northwest territories over the weekend and early next week, the
strongest winds will become confined to the northern outer coastal
california waters. Light to moderate northwest swell will persist
through the forecast period.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt arena to pt reyes 0-10 nm
public forecast: dykema
aviation marine: canepa
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 18 mi35 min NW 4.1 G 5.1 55°F 69°F1016 hPa (+0.0)
46237 - San Francisco Bar, CA (142) 19 mi65 min 54°F4 ft
FTPC1 - 9414290 - San Francisco, CA 21 mi35 min W 4.1 G 11 53°F 56°F1015.6 hPa (+0.0)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi35 min WNW 5.8 G 9.7 53°F 54°F1016 hPa (-0.4)
PXSC1 22 mi35 min 55°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi35 min E 1 G 6 53°F 1014.5 hPa (+0.0)
AAMC1 - 9414750 - Alameda, CA 23 mi35 min W 8 G 12 54°F 64°F1016 hPa (+0.0)
OBXC1 23 mi35 min 54°F 52°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi35 min SSW 6 G 9.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi35 min WSW 5.1 G 8 54°F 1015.5 hPa (+0.0)
LNDC1 25 mi35 min WSW 7 G 11 55°F 1015.5 hPa (+0.0)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi30 min S 1.9 52°F 1015 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi35 min S 14 G 17 55°F 1015.4 hPa (+0.0)
RCMC1 - 9414863 - Richmond, CA 30 mi35 min S 5.1 G 7 54°F 62°F1014.8 hPa (+0.0)
PRYC1 - 9415020 - Point Reyes, CA 40 mi35 min 50°F1015.1 hPa (-0.3)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi35 min WSW 14 G 17 55°F 1014 hPa (+0.0)
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi35 min WNW 12 G 14 56°F 64°F1014 hPa (-0.0)56°F
UPBC1 43 mi35 min NW 8.9 G 12
PCOC1 - 9415144 - Port Chicago, CA 47 mi35 min W 18 G 20 56°F 65°F1013.8 hPa (+0.0)

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi40 minN 05.00 miFog/Mist54°F50°F88%1016.3 hPa
San Francisco, San Francisco International Airport, CA13 mi39 minW 69.00 miA Few Clouds54°F48°F80%1015.2 hPa
San Carlos Airport, CA16 mi40 minNW 49.00 miFair54°F50°F88%1015.6 hPa
Oakland, Metro Oakland International Airport, CA22 mi42 minN 09.00 miMostly Cloudy55°F50°F83%1015.7 hPa

Wind History from SFO (wind in knots)
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Last 24hrW12NW8NW9W10NW9NW9W10NW7NW10NW14NW14NW16NW18W20NW19NW16NW15W18W17W11NW9W8W5W6
1 day agoW6W8W7W9W7W8CalmN3NE5N4N4W13NW16NW16NW18W19W17W16NW18NW13NW15W14W15NW10
2 days agoW4W4W3CalmCalmW3CalmN4NE4NE5NE4E3CalmNW10W12W14W10W8NW9W10W10W9W8W7

Tide / Current Tables for Princeton, Half Moon Bay, California
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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
Fri -- 01:05 AM PDT     0.00 knots Slack
Fri -- 02:11 AM PDT     Moonrise
Fri -- 03:36 AM PDT     0.36 knots Max Flood
Fri -- 06:17 AM PDT     -0.00 knots Slack
Fri -- 06:20 AM PDT     Sunrise
Fri -- 09:48 AM PDT     -0.92 knots Max Ebb
Fri -- 12:14 PM PDT     Moonset
Fri -- 01:40 PM PDT     0.00 knots Slack
Fri -- 03:19 PM PDT     Last Quarter
Fri -- 05:15 PM PDT     0.78 knots Max Flood
Fri -- 07:55 PM PDT     Sunset
Fri -- 08:27 PM PDT     -0.00 knots Slack
Fri -- 11:15 PM PDT     -0.41 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-00.20.30.40.30.1-0.2-0.6-0.9-0.9-0.8-0.6-0.30.10.50.70.80.70.50.2-0.2-0.4-0.4

Weather Map and Satellite Images
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wmap_P
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 (4,6,7,8)
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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.