Wednesday, August23, 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 6:32AMSunset 7:52PM Wednesday August 23, 2017 1:19 AM PDT (08:19 UTC) Moonrise 7:34AMMoonset 8:17PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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- 847 Pm Pdt Tue Aug 22 2017
.small craft advisory in effect from Wednesday evening through late Wednesday night...
Tonight..NW winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 ft at 9 seconds. Patchy fog after midnight.
Wed..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 3 ft at 8 seconds. Patchy fog in the morning.
Wed night..W winds 10 to 20 kt. Wind waves 2 to 4 ft. Mixed swell nw 3 ft at 11 seconds and S 3 ft at 13 seconds.
Thu..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. Mixed swell nw 3 ft at 12 seconds and S 3 ft at 13 seconds. Patchy fog in the morning.
Thu night..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 ft at 13 seconds.
Fri..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 3 to 5 ft.
Sat..W winds 10 kt. Wind waves 2 ft or less. NW swell 4 to 6 ft.
Sun..W winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 4 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 2 to 4 ft with a dominant swell period of 13 seconds. Across the bar...combined seas 3 to 5 ft with a dominant swell period of 13 seconds. Maximum ebb current of 1.8 knots at 04:12 am Wednesday and 1.3 knots at 05:18 pm Wednesday.
PZZ500 847 Pm Pdt Tue Aug 22 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light to moderate winds through midweek, with locally stronger winds through coastal gaps during the afternoons. Building high pressure from the west will bring stronger northerly winds and steep fresh swell. No significant long period swell through the upcoming week.

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 230554
afdmtr
area forecast discussion
national weather service san francisco bay area
1054 pm pdt Tue aug 22 2017

Synopsis Dry weather will prevail today with temperatures
near to slightly below normal for the middle of august. Low
clouds and fog will persist in the overnight and early morning
near the coast and in the valleys the next several days. An inland
warming trend is likely late in the week and into the upcoming
weekend due to strengthening high pressure.

Discussion As of 8:17 pm pdt Tuesday... The marine layer
remains well established this evening with a depth near 1,700
feet. Onshore winds will usher stratus and fog inland tonight and
Wednesday morning with temperatures steadily cooling back. A
nearly stationary, dry and closed mid-upper level low pressure
circulation is located west of the central coast, nearly 200 miles
west of santa maria. This low will advance eastward over
california Wednesday and Thursday while an upper level ridge
gradually builds in late this week behind this departing low. An
inland warming trend is likely for late week and this weekend as a
result of high pressure strengthening over the area.

Prev discussion As of 1:51 pm pdt Tuesday... This morning's overcast
conditions over most of the san francisco bay area have
transitioned to a mostly clear afternoon for much of the area. Low
clouds are still lingering from point reyes northward as well as
the monterey peninsula. When all is set and done this afternoon,
high temperatures should generally top out in the 60s and low 70s
along the coast and upper 70s to perhaps the low 90s for interior
locations. Expect the warmest locations to be in interior san
benito and monterey counties with mid 90s likely.

Synoptically an upper level low remains centered around 150 miles
offshore from big sur around 35n 124w. Models advertise this low
to push onshore by midweek as a broader longwave trough approaches
coastal british columbia. Not expecting much day-to-day change in
temperatures for any particular location during this time with
high temperatures running near seasonal normals. This changes for
Friday as models show a ridge beginning to build over the four
corners and expanding west over the weekend. Interior areas will
return back to the 90s and 100s as a result. Long range guidance
suggests the ridge will remain parked over the southwest with
above normal temperatures likely continuing into next week.

Aviation As of 10:54 pm pdt Tuesday... For 06z tafs. Low clouds
will gradually push in overnight under a compresses 1800 to 2000
ft marine layer. Widespread stratus expected by morning with
clearing between 16z-17z Wednesday morning.

Vicinity of ksfo...VFR conditions expected through late tonight.

Borderline ifr-MVFR CIGS expected to return after midnight
tonight. Low clouds will scatter out around 16z-17z Wednesday
morning. Moderate to light west winds will prevail.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS will prevail through the night.

Low clouds will clear to the coast around 17z Wednesday morning.

Light west winds will prevail through tonight.

Marine As of 8:47 pm pdt Tuesday... Light to moderate winds
through midweek, with locally stronger winds through coastal gaps
during the afternoons. Building high pressure from the west will
bring stronger northerly winds and steep fresh swell. No
significant long period swell through the upcoming week.

Mtr watches warnings advisories
Tngt None.

Public forecast: canepa
aviation: cw
marine: drp cw
visit us at

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46237 - San Francisco Bar, CA (142) 15 mi50 min 60°F3 ft
FTPC1 - 9414290 - San Francisco, CA 17 mi50 min WSW 4.1 G 7 59°F 62°F1016.2 hPa
PXSC1 19 mi50 min 61°F 58°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi50 min WSW 4.1 G 8.9 59°F 1015 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi90 min NW 9.7 G 12 59°F 60°F3 ft1016 hPa (-0.6)
RTYC1 - 9414523 - Redwood City, CA 20 mi50 min NW 5.1 G 6 62°F 74°F1015.4 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi50 min W 1.9 G 5.1 61°F 69°F1016.6 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi50 min WSW 7 G 8
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 21 mi90 min NW 5.8 G 7.8 59°F 61°F3 ft1015.8 hPa (-0.6)
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi50 min W 6 G 8.9 60°F 1016.1 hPa
OBXC1 21 mi50 min 60°F 58°F
LNDC1 22 mi50 min W 4.1 G 7 61°F 1016.1 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 23 mi58 min SSW 7 59°F 1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 26 mi50 min S 13 G 15 61°F 1016 hPa
RCMC1 - 9414863 - Richmond, CA 26 mi50 min SW 1 G 5.1 61°F 64°F1015.6 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi50 min WNW 8.9 G 14 62°F 63°F1015.8 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi50 min WSW 11 G 16 62°F 1015.1 hPa
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi50 min W 12 G 14 63°F 69°F1015.2 hPa60°F
PCOC1 - 9415144 - Port Chicago, CA 44 mi50 min W 17 G 19 63°F 69°F1014.7 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi50 min WNW 12 G 15 68°F 1013.4 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 mi25 minNNW 38.00 miOvercast59°F0°F%1015.6 hPa
San Francisco, San Francisco International Airport, CA12 mi84 minWNW 1110.00 miA Few Clouds60°F55°F86%1015.8 hPa
San Carlos Airport, CA18 mi30 minNW 610.00 miFair63°F55°F77%1016.3 hPa
Oakland, Metro Oakland International Airport, CA21 mi27 minW 98.00 miOvercast60°F57°F93%1015.9 hPa

Wind History from SFO (wind in knots)
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Last 24hrW7W9W9W7NW8NW6W7W9NW8NW10NW11NW11W14NW16
G23
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1 day agoSW7W7S4SW4SW3SW8S8S10S10SW11S8S8SW9
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2 days agoS10S5SW5SW4SW4SW6S11SW6S7E5NE7NE10N10SW13W12SW8SW12W12W11W8NW8NW8W10W9

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Wed -- 06:18 AM PDT     -0.15 feet Low Tide
Wed -- 06:33 AM PDT     Sunrise
Wed -- 08:32 AM PDT     Moonrise
Wed -- 12:54 PM PDT     5.43 feet High Tide
Wed -- 06:35 PM PDT     1.52 feet Low Tide
Wed -- 07:51 PM PDT     Sunset
Wed -- 09:17 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
65.54.431.50.4-0.100.71.83.14.35.15.45.14.23.12.21.61.62.1344.9

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Wed -- 01:43 AM PDT     -0.01 knots Slack
Wed -- 04:36 AM PDT     -1.97 knots Max Ebb
Wed -- 06:32 AM PDT     Sunrise
Wed -- 08:03 AM PDT     0.00 knots Slack
Wed -- 08:32 AM PDT     Moonrise
Wed -- 11:02 AM PDT     1.65 knots Max Flood
Wed -- 02:34 PM PDT     -0.01 knots Slack
Wed -- 05:04 PM PDT     -1.50 knots Max Ebb
Wed -- 07:51 PM PDT     Sunset
Wed -- 08:16 PM PDT     0.01 knots Slack
Wed -- 09:17 PM PDT     Moonset
Wed -- 11:09 PM PDT     1.42 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.5-0.3-1.3-1.9-1.9-1.6-0.9-00.81.41.71.51.10.5-0.4-1.2-1.5-1.3-0.9-0.20.51.21.4

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 (4,6,7,8)
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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.