Wednesday, January24, 2018 L-36.com


Marine Weather and Tides
Moss Beach, CA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
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 7:17AMSunset 5:27PM Wednesday January 24, 2018 3:35 AM PST (11:35 UTC) Moonrise 11:42AMMoonset 12:00AM Illumination 52% Phase: First Quarter Moon; Moon at 8 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- 213 Am Pst Wed Jan 24 2018
.small craft advisory in effect from 9 am pst this morning through this evening...
.small craft advisory in effect from Thursday morning through Thursday evening...
Today..S winds 10 to 20 kt...increasing to 20 to 30 kt in the afternoon. Wind waves 4 to 6 ft. W swell 5 to 7 ft at 14 seconds. Rain in the afternoon.
Tonight..W winds 10 to 20 kt. Wind waves 2 to 4 ft. W swell 7 to 9 ft at 16 seconds. Rain in the evening, then chance of showers after midnight.
Thu..W winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 8 to 10 ft at 15 seconds. Chance of showers in the morning, then showers likely and isolated Thunderstorms in the afternoon.
Thu night..W winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 9 to 12 ft at 14 seconds. Chance of showers in the evening, then slight chance of showers after midnight.
Fri..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 9 to 12 ft at 14 seconds.
Sat..N winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 6 to 9 ft.
Sun..N winds 10 kt. Wind waves 2 ft or less. W swell 6 to 8 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 5 to 7 ft at 13 seconds. Across the bar...combined seas 6 to 9 ft at 13 seconds. Maximum ebb current of 2.2 knots at 09:37 am Wednesday and 1.6 knots at 10:07 pm Wednesday.
PZZ500 213 Am Pst Wed Jan 24 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... An approaching cold front will result in increasing southerly winds today along with chances of rain. Winds will turn westerly this afternoon in the wake of the frontal passage. Instability behind the cold front will bring a slight chance for Thunderstorms across the coastal waters tonight and Thursday.

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 241128
afdmtr
area forecast discussion
national weather service san francisco bay area
328 am pst Wed jan 24 2018

Synopsis Expect increasing rain chances from north to south
through the day as the next storm system impacts the area. Steady
rain quickly turns to showers for Thursday. A round of more
organized showers is possible Thursday afternoon as the upper low
moves inland. Dry weather forecast Friday through the weekend and
into early next week.

Discussion As of 3:28 am pst Wednesday... Goes-east infrared
imagery shows increasing clouds early this morning across the
north bay in advance of an upcoming storm system. Regional radar
shows light to moderate rain presently falling in humboldt county
and locations north. This rain should make it to the north bay
around or after sunrise on Wednesday, with rain chances spreading
south through the day with the sfc cold front's gradual
southeastward progression. Models remain consistent with storm
total rain amounts: 1-2" for the north bay hills mountains, 0.5-1"
for the north bay valleys, and around 0.33-0.67" in the san
francisco bay area (with higher amounts possible in the santa cruz
mountains and lesser amounts possible in the santa clara valley).

Farther south, rain amounts will continue to decrease with
generally less than 0.50" expected in monterey and san benito
counties, with the highest amounts along the coast near around big
sur. In addition to the rain, breezy conditions are possible on
Wednesday with southerly wind gusts up to 25 to 35 mph ahead of
the front.

Behind the cold front, the northwest winds will aid in ushering in
cooler air aloft (ie cold air advection). The 00z Wednesday (4 pm
pst Tuesday) oakland sounding recorded an 850 mb temp of 9 deg c;
by 00z Thursday (4 pm pst Wednesday) expect the 850 mb temps to
fall to around 5 deg c with additional cooling to below 0 deg c
Wednesday night and Thursday. A bit higher in the atmospheric
profile at 700 mb, temperatures presently around 0 deg c will
tumble to around -10 to -13 deg c by Thursday. This will result in
steep lapse rates that will provide increased convective
potential, particularly in the northern waters and the north bay.

Think isolated thunder potential is justified on Thursday
afternoon, and matches with the storm prediction center's day 2
convective outlook. With the freezing levels falling to
3,000-4,000 ft msl, can't rule out the potential for these
convective showers storms to produce small hail and brief heavy
downpours.

Beyond Thursday, forecast models are in good agreement with
building an upper level ridge off the baja california coast. This
will boost 500 mb heights that will translate to dry weather and a
warming trend at the surface as rain chances are deflected to far
northern california, oregon, and washington state. The canadian
model tries to bring in a weak frontal system as far south as the
golden gate by next week Monday or Tuesday, but the GFS and ecmwf
hold the ridge in place with dry conditions prevailing. In fact,
the GFS and ECMWF hold the ridge over the eastern pacific through
the end of january and into the beginning of february.

Aviation As of 4:30 pm pst Tuesday... A few stratocumulus
clouds this afternoon from residual low-level moisture. Next
system will bring increasing moisture Wednesday morning with lower
cigs into the sfo bay area after 15z. Timing of precip appears to
be after 20z for the sfo bay area. Southerly winds increase as
the front approaches after 20z with gusts to 25 kt.

Vicinity of ksfo...VFR through tonight becoming MVFR after 15z and
light rain after 19-20z. Light south to southeast wind overnight
increasing to 15-18 kt gusting to 25 kt after 20z.

Sfo bridge approach... Similar to sfo.

Monterey bay terminals...VFR through Wednesday morning becoming
MVFR after 20z.

Marine As of 03:24 am pst Wednesday... An approaching cold front
will result in increasing southerly winds today along with chances
of rain. Winds will turn westerly this afternoon in the wake of
the frontal passage. Instability behind the cold front will bring
a slight chance for thunderstorms across the coastal waters
tonight and Thursday.

Mtr watches warnings advisories
Tday Sca... Pigeon pt to pt pinos 0-10 nm from 1 pm
sca... Pt pinos to pt piedras blancas 0-10 nm from 1 pm
sca... Pt arena to pigeon pt 10-60 nm
sca... Pigeon pt to pt piedras blancas 10-60 nm from 2 pm
sca... Pt arena to pt reyes 0-10 nm
sca... Sf bay from 9 am
sca... Pt reyes to pigeon pt 0-10 nm from 9 am
sca... Mry bay from 4 pm
public forecast: rowe
aviation: W pi
marine: as
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 18 mi48 min WSW 1.9 G 2.9 46°F 55°F1020.8 hPa
46237 - San Francisco Bar, CA (142) 19 mi66 min 53°F4 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 20 mi46 min S 7.8 G 7.8 54°F 56°F6 ft1019.7 hPa (-1.1)
FTPC1 - 9414290 - San Francisco, CA 21 mi54 min SSW 2.9 G 2.9 47°F 54°F1020.6 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi48 min NNW 1 G 1 49°F 1019.4 hPa
PXSC1 22 mi48 min 50°F 50°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi46 min SE 7.8 G 7.8 52°F 54°F4 ft1019.9 hPa (-1.3)
AAMC1 - 9414750 - Alameda, CA 23 mi54 min Calm G 0 49°F 54°F1020.4 hPa
OBXC1 23 mi48 min 50°F 50°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi48 min NE 1.9 G 2.9
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi48 min NNE 1 G 2.9 49°F 1020.4 hPa
LNDC1 25 mi48 min E 1 G 1.9 50°F 1020.2 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi57 min W 1.9 47°F 1021 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi48 min NE 1.9 G 2.9 48°F 1020.6 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi54 min N 1.9 G 2.9 48°F 53°F1020.1 hPa
PRYC1 - 9415020 - Point Reyes, CA 40 mi48 min ESE 6 G 8 54°F1019.6 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi48 min SE 2.9 G 4.1 46°F 1020.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi48 min S 1.9 G 1.9 45°F 52°F1020.6 hPa45°F
PCOC1 - 9415144 - Port Chicago, CA 47 mi48 min Calm G 1.9 45°F 51°F1020.5 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA3 mi41 minN 010.00 miFair39°F39°F100%1019.6 hPa
San Francisco, San Francisco International Airport, CA13 mi40 minS 410.00 miA Few Clouds46°F42°F86%1020.2 hPa
San Carlos Airport, CA16 mi41 minN 010.00 miFair45°F42°F93%1020.7 hPa
Oakland, Metro Oakland International Airport, CA22 mi43 minENE 48.00 miA Few Clouds43°F43°F100%1020.4 hPa

Wind History from SFO (wind in knots)
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Last 24hrE6CalmS3SE3NE6E4E6E7E3E3N5N3CalmCalmN3CalmW6W3S3CalmCalmCalmCalmS4
1 day agoSE5SE5E8SE5W7W7W11W10NW10W11W11W10W10W11W10W6NW3N7N5NE4NE8N5NE4NE7
2 days agoCalmCalmW3CalmSE4SE6CalmE4E7E5E7E6E4S6SE5SE7SE8SE9SE8SE10S10S8S8S7

Tide / Current Tables for Princeton, Half Moon Bay, California
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Princeton
Click for Map
Wed -- 03:35 AM PST     5.26 feet High Tide
Wed -- 07:18 AM PST     Sunrise
Wed -- 10:15 AM PST     1.68 feet Low Tide
Wed -- 11:41 AM PST     Moonrise
Wed -- 02:20 PM PST     First Quarter
Wed -- 04:07 PM PST     3.61 feet High Tide
Wed -- 05:25 PM PST     Sunset
Wed -- 09:44 PM PST     1.81 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.144.75.25.24.94.23.32.51.91.71.82.12.63.13.43.63.53.22.72.21.91.82.1

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
Wed -- 02:29 AM PST     0.82 knots Max Flood
Wed -- 05:47 AM PST     -0.00 knots Slack
Wed -- 07:18 AM PST     Sunrise
Wed -- 08:59 AM PST     -1.01 knots Max Ebb
Wed -- 11:41 AM PST     Moonrise
Wed -- 12:24 PM PST     0.00 knots Slack
Wed -- 02:20 PM PST     First Quarter
Wed -- 03:15 PM PST     0.65 knots Max Flood
Wed -- 05:24 PM PST     Sunset
Wed -- 06:27 PM PST     -0.01 knots Slack
Wed -- 09:19 PM PST     -0.76 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.60.80.80.60.3-0.1-0.5-0.9-1-0.8-0.5-0.20.20.50.60.60.40.2-0.2-0.5-0.7-0.7-0.3

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 (6,6,7,8)
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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.