Friday, February22, 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 6:49AMSunset 5:57PM Friday February 22, 2019 5:00 AM PST (13:00 UTC) Moonrise 9:50PMMoonset 9:03AM Illumination 90% Phase: Waning Gibbous; Moon at 18 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- 232 Am Pst Fri Feb 22 2019
.small craft advisory for rough bar in effect until 9 am pst this morning...
Today..N winds 5 to 15 kt...becoming nw 10 to 15 kt this afternoon. Gusts up to 25 kt. Wind waves 2 ft or less. NW swell 5 to 8 ft at 14 seconds.
Tonight..NW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 3 to 6 ft at 13 seconds.
Sat..W winds 5 to 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft at 13 seconds.
Sat night..W winds 5 to 10 kt. Wind waves 2 ft or less. W swell 3 to 4 ft at 13 seconds.
Sun..S winds 5 to 10 kt. Wind waves 2 ft or less. NW swell 2 to 5 ft at 13 seconds. A slight chance of rain.
Sun night..S winds 10 to 15 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. NW swell 2 to 4 ft at 12 seconds. A chance of rain.
Mon..S winds 15 to 25 kt with gusts up to 30 kt. Wind waves 3 to 5 ft. W swell 2 to 5 ft. Rain likely.
Tue..S winds 10 to 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. W swell 3 to 4 ft. Rain likely.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 8 to 10 ft with a dominant period of 14 seconds...decreasing to 5 to 7 ft in the afternoon. Across the bar...combined seas 9 to 11 ft with a dominant period of 14 seconds...decreasing to 6 to 9 ft in the afternoon. Maximum ebb current of 3.0 kt at 06:13 am Friday and 3.1 kt at 06:43 pm Friday.
PZZ500 232 Am Pst Fri Feb 22 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Breezy to gusty northerly winds will persist through early this morning before diminishing. Moderate northwest swell will continue into next week. Southerly winds will develop later this weekend and into early next weekend.


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 221146 cca
afdmtr
area forecast discussion
national weather service san francisco bay area
342 am pst Fri feb 22 2019

Synopsis Cool and dry weather conditions will continue across
most of the forecast area through the weekend, except for rain
chances in the north bay from Saturday afternoon through Sunday.

Rain will become likely across the north bay early next week, and
rain may shift southward across the rest of the san francisco bay
area as well. Warmer temperatures are forecast next week,
especially during the overnight hours.

Discussion As of 3:30 am pst Friday... Overnight lows are
running somewhat warmer than previously anticipated despite a
cold, dry air mass settling into the region. Breezy northerly
winds are responsible for the discrepancy, and this is on display
particularly well at napa airport. Kapc (napa airport) is running
9 degrees warmer (45 vs 36) than this same time yesterday, despite
a dew point 14 points lower (19 vs 33), due to 16 mph winds out of
the north. On the flip side, kmry (monterey airport) is running 13
degrees cooler (35 vs 48) than the same time last night given
much lighter winds. With calm winds, radiational cooling at the
surface brings continual heat loss and cooler temperatures.

However, with even light surface winds, some turbulent mixing
occurs which blends the relatively warmer air aloft with the
cooling air near the surface, effectively reducing the heat loss
felt at the surface and keeping overnight temperatures higher
than they otherwise would be. Latest hrrr WRF show winds weakening
away from the hills between 4-8am, which should provide a few
hours of peak diurnal cooling rates. This may be sufficient in
dropping many areas into the 30s to around 40 just after sunrise.

The low pressure system responsible for the cool air mass and
recent showery activity is forecast to exit southern california
into arizona today. Weak ridging will develop in the wake of the
this system closer to home but will quickly transition into mostly
benign westerly flow for all but extreme northern california
through at least most of Saturday.

Farther north this weekend, a 535dm 500mb upper low is forecast to
gradually slide southward along the coastline of british columbia.

This feature will interact with a 0.85" tpw plume being advected
towards the west coast by a different low pressure system deeper
in the pacific ocean. As a result, wet weather is anticipated to
return to the northern periphery of the north bay sometime late
Saturday into early Sunday. The euro is the most aggressive with
bringing rain into the region, pushing light rain as far southward
as coastal san mateo county by Saturday evening. The GFS on the
other hand keeps the bulk of the moisture north of sonoma into
mendocino county through the weekend. For now, have leaned more
towards the euro output, with a slight chance to chance of rain
across the north bay on Sunday.

Models then show a higher likelihood of rain by early next week
when the aforementioned well offshore pacific low closes in on the
california coastline, while at the same time lugging along a
wetter, more expansive precipitable water plume for the nearby
storm systems to work with. Tpw values jump up as high as 1.25"
later Monday into Tuesday but the GFS and euro disagree on where
exactly this plume of moisture will be aimed. The GFS aims it
directly at the sf bay area while the euro and NAM push it
slightly farther northward into the north bay. For now, will
continue to side with the euro NAM output and the current forecast
reflects this, with the bulk of the QPF residing across sonoma,
marin, and napa counties. The heaviest rain will likely occur from
late Monday throughout the day Tuesday, with lingering showers
possible as late as Thursday morning. Storm total rain between
Monday and Wednesday from this storm system will be entirely
dependent on where the narrow band of deeper moisture is focused,
however, given the latest data we are expecting 3.5-5" in the
north bay mountains and coastal ranges, with 1.5-3.5" in the north
bay valleys. Farther south, san francisco and oakland may see up
to around an inch, while the south bay and inland east bay may see
up to around half an inch. Farther south, the monterey bay region
may only see around a quarter of an inch as the bulk of the
moisture remains farther northward. All that said, these numbers
may change significantly in favor of the sf bay area if it turns
out the GFS solution becomes favored by the other models.

In addition to rain, breezy to gusty southerly winds should be
expected. Winds are currently not expected to be as big of an
impact as with previous storm systems so far this year.

Temperatures should be relatively mild when compared to recent
days as well given the warmer, moister origin of this air mass.

Afternoon highs in the 60s to low 70s are possible by midweek
while lows will struggle to drop below the upper 40s under mostly
cloudy skies.

The region will briefly dry out late Thursday into early Friday of
next week as weak ridging develops across the southwestern conus.

Models show general agreement that a different storm system will
bring another round of rain and wind to california late next week
through next weekend. But for now, the focus will be on the
upcoming storm system set for early next week. Stay tuned.

Aviation As of 3:24 am pst Friday... For 12z tafs...VFR
conditions through the period with light to moderate winds. A few
cu build up clouds are possible this afternoon, but impacts will
be minimal. High level clouds increase on Saturday.

Vicinity of ksfo...VFR..

Sfo bridge approach... Similar to sfo.

Monterey bay terminals...VFR.

Marine As of 03:35 am pst Friday... Breezy to gusty northerly
winds will persist through early this morning before diminishing.

Moderate northwest swell will continue into next week. Southerly
winds will develop later this weekend and into early next weekend.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm until 9 am
sca... Pt arena to pigeon pt 10-60 nm until 9 am
sca... Pigeon pt to pt piedras blancas 10-60 nm until 9 am
sca... Pt pinos to pt piedras blancas 0-10 nm
sca... Rough bar advisory for sf bar until 9 am
public forecast: drp
aviation: mm
marine: mm
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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 mi42 min SSE 4.1 G 5.1
FTPC1 - 9414290 - San Francisco, CA 21 mi48 min N 8 G 9.9 48°F 53°F1016.5 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi40 min N 9.7 G 14 50°F 53°F1016.6 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi42 min N 13 G 16
PXSC1 22 mi48 min 49°F 26°F
OBXC1 23 mi48 min 47°F 23°F
AAMC1 - 9414750 - Alameda, CA 23 mi48 min N 4.1 G 8 46°F 51°F1016.7 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi42 min NE 12 G 15
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi48 min NNE 11 G 16
LNDC1 25 mi42 min N 4.1 G 7
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi49 min W 2.9 44°F 1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi42 min NNE 11 G 15 47°F 1016.4 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi48 min N 14 G 18 48°F 53°F1015.9 hPa
PRYC1 - 9415020 - Point Reyes, CA 40 mi48 min 52°F1016.1 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi42 min N 2.9 G 4.1 45°F 1016.4 hPa
UPBC1 43 mi42 min W 2.9 G 5.1
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi48 min SSW 5.1 G 6 42°F 48°F1016.6 hPa23°F
PCOC1 - 9415144 - Port Chicago, CA 47 mi42 min S 1.9 G 2.9

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Francisco, San Francisco International Airport, CA13 mi64 minN 1210.00 miFair47°F26°F44%1016.1 hPa
San Carlos Airport, CA16 mi65 minN 010.00 miFair41°F24°F53%1016.3 hPa
Oakland, Metro Oakland International Airport, CA22 mi67 minN 010.00 miFair47°F18°F31%1016.3 hPa

Wind History from HAF (wind in knots)
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1 day agoSW5W4CalmNE4NE4CalmNE4NE3NE3NE3CalmCalmNE3CalmCalmCalmCalmSE3SE6SE9SE9SE10--SE9
2 days agoNW14
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NW10NW12N10N9N9NW9N7N4N5CalmCalmNE3CalmCalmE5CalmCalmS4S7SE7SW4--S5

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
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Fri -- 12:33 AM PST     5.67 feet High Tide
Fri -- 06:26 AM PST     1.08 feet Low Tide
Fri -- 06:50 AM PST     Sunrise
Fri -- 09:02 AM PST     Moonset
Fri -- 12:26 PM PST     5.48 feet High Tide
Fri -- 05:56 PM PST     Sunset
Fri -- 06:43 PM PST     0.27 feet Low Tide
Fri -- 09:50 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.65.653.92.71.71.11.21.82.83.94.95.45.44.83.62.31.10.40.30.81.834.2

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
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Oyster Point 2.8 mi E
Click for Map
Fri -- 02:44 AM PST     -0.00 knots Slack
Fri -- 05:53 AM PST     -1.59 knots Max Ebb
Fri -- 06:50 AM PST     Sunrise
Fri -- 08:47 AM PST     0.00 knots Slack
Fri -- 09:02 AM PST     Moonset
Fri -- 11:46 AM PST     1.06 knots Max Flood
Fri -- 02:53 PM PST     -0.00 knots Slack
Fri -- 05:55 PM PST     Sunset
Fri -- 06:12 PM PST     -1.69 knots Max Ebb
Fri -- 09:13 PM PST     0.00 knots Slack
Fri -- 09:49 PM PST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.90.5-0.2-0.9-1.4-1.6-1.3-0.60.10.611.10.90.5-0.1-0.8-1.4-1.7-1.5-1-0.20.40.9

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (8,2,3,4)
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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.