Wednesday, April25, 2018 L-36.com


Marine Weather and Tides
Moss Beach, CA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:18AMSunset 7:56PM Wednesday April 25, 2018 4:32 PM PDT (23:32 UTC) Moonrise 2:37PMMoonset 3:12AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 229 Pm Pdt Wed Apr 25 2018
Tonight..SW winds 10 kt. Wind waves 2 ft or less. W swell 4 to 6 ft at 13 seconds and sw 3 ft at 17 seconds.
Thu..W winds 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft at 12 seconds.
Thu night..W winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 to 4 ft at 11 seconds and sw 3 ft at 16 seconds.
Fri..SW winds 10 kt. Wind waves 2 ft or less. W swell 3 to 5 ft at 16 seconds and sw 3 ft at 15 seconds.
Fri night..W winds 5 to 15 kt. Wind waves 1 to 3 ft. W swell 3 to 5 ft at 15 seconds and sw 3 ft at 16 seconds.
Sat..W winds 5 to 15 kt. Wind waves 1 to 3 f. W swell 4 to 6 ft and S 3 ft.
Sun..W winds 15 to 25 kt. Wind waves 3 to 5 ft. W swell 4 to 6 ft.
Mon..NW winds 20 to 30 kt. Wind waves 4 to 6 ft. NW swell 3 to 5 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 5 to 7 ft with a dominant swell period of 13 seconds. Across the bar...combined seas 6 to 8 ft with a dominant swell period of 13 seconds. Maximum ebb current of 2.8 knots at 01:31 am Thursday and 2.4 knots at 01:37 pm Thursday.
PZZ500 229 Pm Pdt Wed Apr 25 2018
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Winds will remain generally light over the coastal waters overnight, though locally breezy conditions could develop near coastal gaps or prominent points during the day on Thursday. Light to moderate seas will continue through the forecast period with a mixed south and northwest swell developing late in the week.

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 252045
afdmtr
area forecast discussion
national weather service san francisco bay area
145 pm pdt Wed apr 25 2018

Synopsis Cool, summer likely conditions will persist over the
region through Thursday with additional cooling expected Friday
into the upcoming weekend. There will be a slight chance of
showers Friday night into Saturday for the far northern portions
of the north bay as the upper level system responsible for the
cool down pushes inland to our north. Dry conditions along with a
slight warming trend appears likely early next week.

Discussion As of 01:45 pm pdt Wednesday... The marine layer
again impacted the region this morning with low clouds slow to
burn-off through the late morning. Temperatures range from the
upper 50s at the coast to lower 70s in our warmer inland locations
as well as higher elevations above the 1,800 foot marine layer.

Looking for similar conditions tonight into Thursday ahead of an
approaching mid upper level trough.

Temperatures will trend a few degrees cooler on Friday and continue
to be below seasonal averages into the upcoming weekend in response
to the mid upper level trough pushing inland. The core of the upper
level low will then push into the pacific northwest and northern
california late Friday into Saturday and bring a slight chance of
showers. Rain showers may develop as far south as the northern
portions of the north bay during this time frame. However,
widespread rainfall is unlikely and most locations will remain dry,
especially south of the golden gate bridge.

A slight warming trend is then likely early next week as the trough
axis shifts inland and a ridge of high pressure develops over the
eastern pacific. However, the ridge is forecast to stay far enough
offshore to prevent significant warming. Ongoing dry weather
conditions are also expected in the extended forecast period.

Aviation As of 10:37 am pdt Wednesday for 18z tafs. Low
ceilings impacted all TAF terminals this morning with widespread
lifr ifr MVFR conditions. Visible satellite shows the gradual
eroding mixing-out of the stratus as of the 18z TAF publication
and think most terminals will transition toVFR conditions in the
next hour or so. The fort ord profiler indicates the marine layer
as gradually increased over the past 12 hours from about 1,500 ft
to 2,000 ft deep, likely in response to the approaching upper
level low. More of the same is expected this tonight with low
clouds again for Thursday morning.

Vicinity of ksfo... Transitioning from MVFR toVFR conditions at
the TAF publication time as this morning's stratus mixes out.

West to northwest winds are expected this afternoon around 15 kt.

The main concern turns to what is going to happen this
evening overnight with the stratus return. At this point think
we'll see bkn conditions return sometime after 6-7z Thursday, or
several hours earlier than this morning. Will continue to monitor
and update the TAF accordingly.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... MVFR ifr conditions at kmry until late
morning as stratus lingers over the terminal. There is a non-zero
chance we could see the low clouds persist into the afternoon, but
confidence is too low to adjust the TAF as so. Expect low clouds
to return sometime in the late afternoon evening hours with
overcast conditions again for tomorrow morning.

Marine As of 10:21 am pdt Wednesday... Generally light to
locally moderate west to northwest winds will continue through
the week. Light to moderate seas will also persist through the
forecast period with a mixed south and northwest swell developing
late in the week.

Mtr watches warnings advisories
Tngt None.

Public forecast: rgass
aviation: rowe
marine: rowe
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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 mi44 min WNW 7 G 9.9 64°F 67°F1017.4 hPa
46237 - San Francisco Bar, CA (142) 19 mi62 min 54°F5 ft
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 20 mi42 min WSW 3.9 G 5.8 54°F 58°F7 ft1018.4 hPa (-0.8)
FTPC1 - 9414290 - San Francisco, CA 21 mi50 min WSW 9.9 G 18 54°F 56°F1018.1 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 22 mi44 min W 8 G 19 57°F 1016.7 hPa
PXSC1 22 mi44 min 58°F 47°F
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 22 mi42 min WSW 5.8 G 7.8 52°F 56°F5 ft1018.6 hPa (-1.0)
AAMC1 - 9414750 - Alameda, CA 23 mi50 min W 8 G 12 58°F 64°F1017.7 hPa
OBXC1 23 mi44 min 57°F 49°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 24 mi44 min W 8.9 G 12
OKXC1 - 9414776 - Oakland (Berth 34), CA 24 mi44 min W 8.9 G 12 58°F 1017.6 hPa
LNDC1 25 mi44 min W 8 G 11 58°F 1017.6 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 27 mi45 min WSW 4.1 56°F 1017 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 29 mi50 min SSW 9.9 G 15 56°F 1017.6 hPa
RCMC1 - 9414863 - Richmond, CA 30 mi50 min SW 6 G 9.9 59°F 59°F1017.1 hPa
PRYC1 - 9415020 - Point Reyes, CA 40 mi44 min W 4.1 G 8 57°F1018 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 41 mi44 min WSW 13 G 15 62°F 1016.2 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 43 mi44 min W 11 G 13 65°F 63°F1016.1 hPa55°F
PCOC1 - 9415144 - Port Chicago, CA 47 mi44 min W 16 G 18 66°F 63°F1015.7 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 mi37 minSW 68.00 miOvercast55°F48°F77%1019 hPa
San Francisco, San Francisco International Airport, CA13 mi36 minW 1310.00 miA Few Clouds64°F46°F54%1017.2 hPa
San Carlos Airport, CA16 mi45 minW 810.00 miClear64°F48°F56%1016.9 hPa
Oakland, Metro Oakland International Airport, CA22 mi39 minNW 1310.00 miFair61°F48°F65%1017.4 hPa
Palo Alto Airport, CA23 mi45 minNNW 108.00 miClear0°F0°F%1016.9 hPa

Wind History from SFO (wind in knots)
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Last 24hrW18W21W16NW10W10W10W8W8W8W7W6CalmSW4W7W6S4W5SE4NW11NW12NW13W15W16W13
1 day agoW18W19W18W19W14NW11W11W7NW4NW4W5W5S3SW5W5W6W6NW8NW8NW10NW12W14W16W16
2 days agoW14W18W15NW14NW12NW12W9W8W7W8W7W7W6W5W6SW5CalmN5E4NE4N4NW14W17W18

Tide / Current Tables for Princeton, Half Moon Bay, California
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Princeton
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Wed -- 01:54 AM PDT     1.71 feet Low Tide
Wed -- 04:11 AM PDT     Moonset
Wed -- 06:21 AM PDT     Sunrise
Wed -- 07:33 AM PDT     4.67 feet High Tide
Wed -- 02:04 PM PDT     -0.01 feet Low Tide
Wed -- 03:37 PM PDT     Moonrise
Wed -- 07:54 PM PDT     Sunset
Wed -- 08:50 PM PDT     5.21 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.41.91.722.63.44.14.64.64.23.22.110.3-00.20.91.93.14.255.24.84

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
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Wed -- 01:00 AM PDT     -0.85 knots Max Ebb
Wed -- 03:56 AM PDT     0.01 knots Slack
Wed -- 04:11 AM PDT     Moonset
Wed -- 06:20 AM PDT     Sunrise
Wed -- 06:57 AM PDT     0.82 knots Max Flood
Wed -- 09:44 AM PDT     -0.00 knots Slack
Wed -- 01:04 PM PDT     -1.17 knots Max Ebb
Wed -- 03:36 PM PDT     Moonrise
Wed -- 04:16 PM PDT     0.01 knots Slack
Wed -- 07:35 PM PDT     1.14 knots Max Flood
Wed -- 07:54 PM PDT     Sunset
Wed -- 10:40 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.8-0.9-0.8-0.500.50.70.80.70.4-0.1-0.7-1-1.2-1.1-0.8-0.20.40.91.11.10.90.4-0.2

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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Wind Forecast for San Francisco/Monterey Bay Area, CA (19,4,5,8)
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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.