Saturday, November18, 2017 L-36.com


Marine Weather and Tides
Montara, 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 6:53AMSunset 4:57PM Saturday November 18, 2017 6:09 AM PST (14:09 UTC) Moonrise 6:54AMMoonset 5:34PM Illumination 0% Phase: New Moon; Moon at 29 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- 245 Am Pst Sat Nov 18 2017
Today..N winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft at 12 seconds.
Tonight..N winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds.
Sun..NW winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 4 ft at 13 seconds.
Sun night..NW winds 10 kt. Wind waves 2 ft or less. NW swell 2 to 3 ft at 14 seconds. Slight chance of rain after midnight.
Mon..E winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 to 5 ft at 14 seconds. Chance of rain.
Tue..NE winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft. Slight chance of rain.
Wed..N winds 10 kt. Wind waves 2 ft or less. NW swell 5 to 6 ft. Slight chance of rain.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 5 ft with a dominant swell period of 11 seconds. Across the bar...combined seas 4 to 6 ft with a dominant swell period of 11 seconds. Maximum ebb current of 0.9 knots at 03:42 am Saturday and 1.9 knots at 03:48 pm Saturday.
PZZ500 245 Am Pst Sat Nov 18 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure over the great basin will weaken Sunday as a frontal system approaches the pacific northwest. Light offshore winds through Sunday. Winds will switch to southerly over the northern waters Sunday night and Monday then increase on Tuesday. Winds over the southern waters will remain light to moderate northwest.

7 Day Forecast for Marine Location Near Montara, CA
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location: 37.57, -122.58     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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Fxus66 kmtr 181147
afdmtr
area forecast discussion
national weather service san francisco bay area
347 am pst Sat nov 18 2017

Synopsis Dry and seasonably cool weather can be expected
through the weekend. The next system will bring rain chances late
Sunday night through Monday, mainly across the north bay.

Additional rainfall is possible at times in the north bay for
much of next week, but most of our area will likely see dry and
warm weather.

Discussion As of 3:00 am pst Saturday... Cool conditions this
morning with many places at this hour in the 30s and 40s. In fact,
many spots over the north bay have dropped into the lower 30s and
could see another degree or two drop by sunrise. Still waiting for
fog to form over the north bay, although that may be very limited.

The cooler conditions will also lead to patchy frost.

A building ridge of high pressure will combine with an offshore
flow to bring dry weather to our entire CWA both today and
tomorrow. Highs will be in the upper 50s to the mid 60s with lows
Sunday morning forecast to be close to this morning's values.

Patchy frost will again be possible.

The synoptic patter will undergo a change as a moist flow takes
aim on the west coast. Models over the past few days have been
trending drier by pushing the moisture farther to the north as a
ridge of high pressure builds along the coast from the south. This
will lead to the bulk of the rain staying to our north with the
southern extent into a portion of our cwa. Although there remains
disagreement on the southern extent of the rain plus which day,
there is general agreement that for most of next week
precipitation will be possible over the north bay with
diminishing chances heading to the south. Definitely possible that
much of our CWA stays dry for all of the days.

Rainfall amounts by Friday will range from 1 4" to 3 4" for the
north bay to near zero for the southern third. Locations around
san francisco bay can expect 0.05" to 0.15". Temperatures will
also be warmer -- 60s and 70s.

Longer range outlook does bring a major atmospheric river into our
region for the remainder of the month.

Aviation As of 3:45 am pst Saturday... Surface high pressure
over the great basin will provide dry northerly flow forVFR
conditions. The only thing to watch for is the possibility of
morning fog at sts.

Vicinity of ksfo...VFR. Light offshore winds becoming west-
northwest after 20z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals...VFR.

Marine As of 3:45 am pst Saturday... High pressure over the
great basin will weaken Sunday as a frontal system approaches the
pacific northwest. Light offshore winds through Sunday. Winds will
switch to southerly over the northern waters Sunday night and
Monday then increase on Tuesday. Winds over the southern waters
will remain light to moderate northwest.

Mtr watches warnings advisories
Tday None.

Public forecast: bell
aviation: W pi
marine: W pi
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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 15 mi70 min 56°F3 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi80 min E 5.8 G 7.8 54°F 56°F4 ft1022.6 hPa (+0.0)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 21 mi80 min NE 9.7 G 12 57°F 59°F5 ft1021.9 hPa (-0.3)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 23 mi63 min WSW 2.9 46°F 1023 hPa

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA6 mi75 minNNE 310.00 miFair39°F35°F87%1022 hPa
San Francisco, San Francisco International Airport, CA12 mi74 minSW 410.00 miFair44°F37°F76%1023 hPa
San Carlos Airport, CA18 mi75 minN 010.00 miFair43°F37°F81%1023 hPa
Oakland, Metro Oakland International Airport, CA21 mi77 minENE 410.00 miFair40°F37°F89%1023 hPa

Wind History from HAF (wind in knots)
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Last 24hrN6NE4N3N5NW10NW9N9
G16
N9--NW11N7N4NE3NE9NE6N5NE4NE6NE5NE3CalmCalmN3Calm
1 day agoNW4CalmW3CalmCalmNW4CalmCalmCalmCalmCalmCalmCalmSE3SE3S6NW14
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2 days agoCalmN4CalmNE4CalmSE5SE9SE6SE7S9S12
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NW5N6NW5

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Sat -- 03:42 AM PST     New Moon
Sat -- 03:46 AM PST     2.21 feet Low Tide
Sat -- 06:53 AM PST     Sunrise
Sat -- 06:53 AM PST     Moonrise
Sat -- 09:44 AM PST     5.71 feet High Tide
Sat -- 04:34 PM PST     -0.35 feet Low Tide
Sat -- 04:56 PM PST     Sunset
Sat -- 05:34 PM PST     Moonset
Sat -- 11:23 PM PST     4.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.13.52.82.32.22.63.34.155.65.75.34.32.91.50.4-0.3-0.30.21.12.13.144.4

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Sat -- 12:13 AM PST     -0.00 knots Slack
Sat -- 02:29 AM PST     -1.01 knots Max Ebb
Sat -- 03:42 AM PST     New Moon
Sat -- 05:35 AM PST     0.01 knots Slack
Sat -- 06:53 AM PST     Sunrise
Sat -- 06:53 AM PST     Moonrise
Sat -- 08:22 AM PST     1.09 knots Max Flood
Sat -- 11:36 AM PST     -0.00 knots Slack
Sat -- 02:37 PM PST     -1.79 knots Max Ebb
Sat -- 04:56 PM PST     Sunset
Sat -- 05:34 PM PST     Moonset
Sat -- 06:17 PM PST     0.01 knots Slack
Sat -- 09:21 PM PST     1.43 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.2-0.6-1-1-0.7-0.30.20.81.110.80.4-0.3-1.2-1.7-1.8-1.5-1-0.20.61.11.41.41.1

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 (9,2,3,4)
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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.