Wednesday, May24, 2017 L-36.com


Marine Weather and Tides
Montara, CA

Version 3.4
What's New / NOTES
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 5:51AMSunset 8:22PM Wednesday May 24, 2017 8:14 PM PDT (03:14 UTC) Moonrise 4:21AMMoonset 6:12PM 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- 241 Pm Pdt Wed May 24 2017
.small craft advisory in effect from late tonight through late Thursday night...
Tonight..S winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 11 seconds.
Thu..S winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 5 to 7 ft at 11 seconds.
Thu night..S winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 4 to 6 ft at 10 seconds.
Fri..S winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 4 to 6 ft at 10 seconds.
Fri night..SW winds 10 kt. Wind waves 2 ft or less. NW swell 3 to 5 ft at 10 seconds. Patchy fog after midnight.
Sat..W winds 5 to 15 kt. Wind waves 1 to 3 ft. NW swell 2 to 4 ft. Patchy fog.
Sun..NW winds 10 to 20 kt. Wind waves 2 to 4 ft. NW swell 2 to 4 ft.
Memorial day..NW winds 15 to 25 kt. Wind waves 3 to 5 ft. NW swell 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...combined seas 3 to 5 ft with a period of 14 seconds. Across the bar...combined seas 4 to 6 ft with a period of 14 seconds. Maximum ebb current of 1.1 knots at 02:54 pm Wednesday and 2.1 knots at 03:00 am Thursday.
PZZ500 241 Pm Pdt Wed May 24 2017
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Low pressure off the central california coast will bring southerly winds to the area through Thursday. Local gusty winds can be expected Thursday along the big sur and Monterey bay coastline. Surface high pressure further out in the eastern pacific is bringing northerly winds offshore north of point reyes. This high will eventually rebuild off the coast resulting in increasing northerly winds by late this weekend.

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 250046
afdmtr
area forecast discussion
national weather service san francisco bay area
545 pm pdt Wed may 24 2017

Synopsis A cooling trend can be expected through Friday as
high pressure weakens and the marine influence increases. Minor
warming is then expected during the upcoming weekend into early
next week as high pressure returns to the west coast.

Discussion As of 01:33 pm pdt Wednesday... Only minor changes
to the ongoing forecast as unseasonably cool weather prevails into
the weekend with a gradual warm up next week.

Synoptically speaking an upper low remains off the coast spreading
mid and high level clouds over the region. At the surface, onshore
flow continues to keep low clouds and patchy fog along the coast.

The upper low and onshore flow led to much cooler temps around
the region today. 24 hour trend shows some impressive 24 hour
drops, 10 to 15 degrees colder in some spots. At 1 pm santa rosa
is 13 degrees colder today than Tuesday.

Only minor tweaks were made to previous forecast. Night and
morning clouds will continue with a marine layer 1,500 to 2,000
feet into the weekend. Patchy fog and drizzle will be possible,
especially along the immediate coastline. Milder temps will be
possible above the marine layer the next few nights, but not a
very strong thermal belt. As for daytime highs, temperatures will
continue to cool through Friday. Interior locations will drop to
very cool temps for late may with highs in the 70s to lower 80s.

Friday's forecast compare to climo is roughly 5-10 degrees below
normal.

Temperatures will begin to moderate and eventually warm over the
upcoming holiday weekend as high pressure builds over the region.

The warmest of the three days will be memorial day, but mainly
over the interior. Persistent low clouds fog will keep
coastal bay shoreline area cool. Highs on Monday will be 60s to
70s coast and 80s to lower 90s interior. Temperatures level off
next Tuesday and Wednesday.

Outside of some night morning drizzle not forecasting any
noteworthy rain through the end of the month.

Aviation As of 5:45 pm pdt Wednesday... It's a chaotic stratus
and wind pattern presently with a steadily deepening marine layer
responding to ongoing lower level cooling on southerly flow along
the immediate coast. Much cooler pacific air modified by coastal
ssts in the 50s includes modified cooler air arriving from the
mid-high latitudes wrapping around a lower level circulation off
the ca coast. A mid level 500 mb height low approx 400 miles SW of
the bay area advances to the coast coinciding with a newly
developing weak surface low pressure center remaining nearly
stationary just west of the bay area thu-fri. As a result spotty
coastal drizzle or very light rain is possible, none indicated in
00z tafs presently, but will amend as needed.

The marine layer becomes more and more elevated tonight and Thursday.

The primary forecast challenge will be coverage and duration of
stratus ceilings. 925 mb and 850 mb cooling may reach the point of
mixing out the marine layer inversion almost entirely Thursday and
Thursday night.

Vicinity of ksfo... S-sw winds 10-15 knots til 06z this evening then
probably shifting back toward w-sw by later evening, timing is low
confidence. Coordinated with cwsu and we decided to delay the onset
of forecast stratus ceiling based on present local stratus coverage
and wind pattern. Sfo-sac pressure gradient is a healthy 3.6 mb thus
the stratus could suddenly shift inland, but the forecast strongly
hedges on the south wind component holding longer; tempo MVFR cig
06z-08z the MVFR prevailing into Thursday morning.VFR forecast from
17z Thursday through 06z Thursday evening.

Sfo bridge approach... Similar to ksfo. Wind direction forecast is
low confidence from the santa clara valley to smb approach due to
recently strong 2 mb to 3 mb southerly gradient ksns-ksjc; 5 min
metar obs show NW wind 10 knots at ksjc. 00z TAF ksjc forecasts se
wind developing by 03z.

Monterey bay terminals... Tempo MVFR CIGS 00z-04z this evening then
MVFR prevailing tonight and Thursday morning. At least partial clearing
is likely by late Thursday morning depending if the marine layer
inversion persists.

Marine As of 4:40 pm pdt Wednesday... Low pressure off the
central california coast will bring southerly winds to the area
through Thursday. Local gusty winds can be expected Thursday along
the big sur and monterey bay coastline. Surface high pressure
further out in the eastern pacific is bringing northerly winds
offshore north of point reyes. This high will eventually rebuild
off the coast resulting in increasing northerly winds by late this
weekend.

Mtr watches warnings advisories
Tngt Sca... Pt arena to pigeon pt 10-60 nm
sca... Pt reyes to pigeon pt 0-10 nm from 3 am
sca... Pt pinos to pt piedras blancas 0-10 nm from 3 am
sca... Sf bay until 9 pm
public forecast: mm
aviation: canepa
marine: W pi
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 mi45 min 54°F5 ft
FTPC1 - 9414290 - San Francisco, CA 17 mi45 min WSW 14 G 19 55°F 55°F1007.8 hPa
PXSC1 19 mi45 min 57°F 51°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi45 min WSW 9.9 G 14 56°F 1006.4 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi85 min S 9.7 G 12 53°F 53°F6 ft1008.2 hPa (-1.6)
RTYC1 - 9414523 - Redwood City, CA 20 mi45 min W 9.9 G 11 61°F 71°F1006 hPa
AAMC1 - 9414750 - Alameda, CA 20 mi45 min W 8.9 G 15 58°F 65°F1007.8 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 21 mi85 min SW 7.8 G 9.7 54°F 54°F7 ft1008.1 hPa (-1.4)
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi45 min W 11 G 16 58°F 1007.4 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi45 min WSW 19 G 23
OBXC1 21 mi45 min 57°F 51°F
LNDC1 22 mi45 min W 12 G 16 58°F 1007.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 23 mi58 min NW 8.9 55°F 1007 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 26 mi45 min WSW 17 G 23 57°F 1007.3 hPa
RCMC1 - 9414863 - Richmond, CA 26 mi45 min SW 7 G 13 56°F 60°F1007.4 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi45 min SE 5.1 G 16 56°F 57°F1007.2 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi45 min WSW 19 G 24 57°F 1006.4 hPa
UPBC1 40 mi45 min W 21 G 29
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi45 min WSW 12 G 21 57°F 65°F1006.7 hPa53°F
PCOC1 - 9415144 - Port Chicago, CA 44 mi45 min WSW 20 G 24 57°F 66°F1006.1 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi45 min WNW 18 G 25 60°F 1004.6 hPa

Wind History for San Francisco, CA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA6 mi2 hrsS 127.00 miOvercast57°F50°F77%1009.1 hPa
San Francisco, San Francisco International Airport, CA12 mi79 minS 1310.00 miMostly Cloudy62°F46°F58%1007 hPa
San Carlos Airport, CA18 mi28 minW 910.00 miMostly Cloudy59°F48°F68%1006.8 hPa
Oakland, Metro Oakland International Airport, CA21 mi22 minWNW 910.00 miMostly Cloudy61°F51°F70%1007.3 hPa

Wind History from HAF (wind in knots)
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Last 24hrS4SW3W5CalmSW4CalmCalmCalmS3S4SW3S3SE4S5S5S5S8S9S10S9S12S12
G15
S10
G16
S12
1 day agoSW4S4S3SW4CalmS5SE6S8S8S6SE5SE4SE4SE4SE4S3W6W7SW7SW8SW9SW7SW5S5
2 days agoW3W3CalmN3CalmW3CalmNW3E4E3NE5E3E3CalmSE3S4W6W6SW6SW5W7SW6W6SW5

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Wed -- 04:10 AM PDT     -0.82 feet Low Tide
Wed -- 05:20 AM PDT     Moonrise
Wed -- 05:54 AM PDT     Sunrise
Wed -- 10:44 AM PDT     4.47 feet High Tide
Wed -- 03:57 PM PDT     1.46 feet Low Tide
Wed -- 07:11 PM PDT     Moonset
Wed -- 08:20 PM PDT     Sunset
Wed -- 10:05 PM PDT     6.26 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.92.30.7-0.4-0.8-0.60.21.32.53.64.34.54.13.32.41.71.51.82.73.855.96.36

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Wed -- 02:18 AM PDT     -2.15 knots Max Ebb
Wed -- 05:20 AM PDT     Moonrise
Wed -- 05:46 AM PDT     0.00 knots Slack
Wed -- 05:53 AM PDT     Sunrise
Wed -- 08:47 AM PDT     1.75 knots Max Flood
Wed -- 12:27 PM PDT     -0.01 knots Slack
Wed -- 02:47 PM PDT     -1.40 knots Max Ebb
Wed -- 05:43 PM PDT     0.00 knots Slack
Wed -- 07:11 PM PDT     Moonset
Wed -- 08:20 PM PDT     Sunset
Wed -- 08:40 PM PDT     1.49 knots Max Flood
Wed -- 11:57 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.7-1.6-2.1-2-1.5-0.70.21.11.61.71.51.10.4-0.5-1.2-1.4-1.1-0.50.20.91.41.51.20.7

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 (23,6,7,8)
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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.