Friday, August23, 2019 L-36.com


Marine Weather and Tides
Montara, CA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:31AMSunset 7:53PM Friday August 23, 2019 3:45 PM PDT (22:45 UTC) Moonrise 11:33PMMoonset 1:07PM Illumination 41% Phase: Third Quarter Moon; Moon at 23 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 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 225 Pm Pdt Fri Aug 23 2019
Tonight..SW winds 5 to 10 kt, becoming S 10 to 15 kt after midnight. W swell 4 to 6 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat..S winds 5 to 15 kt. NW swell 3 to 5 ft at 10 seconds and sw around 2 ft at 16 seconds.
Sat night..W winds 5 to 10 kt. Wind waves 2 to 3 ft. W swell 2 to 3 ft at 13 seconds and sw around 2 ft at 15 seconds.
Sun..W winds 5 to 10 kt. Wind waves 1 to 2 ft. Mixed swell W 2 to 4 ft at 13 seconds and S 2 to 3 ft at 15 seconds.
Sun night..W winds 5 to 10 kt. Mixed swell W 3 to 5 ft at 12 seconds and S 2 to 3 ft at 14 seconds.
Mon..W winds 5 to 10 kt. Mixed swell nw 3 to 5 ft at 11 seconds and S 2 to 3 ft at 13 seconds. Patchy fog.
Mon night..NW winds around 5 kt. Mixed swell nw 3 to 5 ft at 11 seconds and S 2 to 3 ft at 12 seconds. Patchy fog.
Tue..W winds 5 to 10 kt. Mixed swell nw 2 to 4 ft and S 2 to 3 ft. Patchy fog.
Wed..W winds 5 to 10 kt. Mixed swell nw 2 to 3 ft and S around 2 ft. Patchy fog.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 5 to 7 ft with a dominant period of 10 seconds. Across the bar...seas 5 to 7 ft with a dominant period of 10 seconds. Maximum ebb current of 2.3 kt at 10:43 pm Friday and 1.0 kt at 12:19 pm Saturday.
PZZ500 225 Pm Pdt Fri Aug 23 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Northwest winds will continue to diminish across the coastal waters through tonight with strongest winds remaining over the northern outer waters. Steep, short period northwesterly swells will also diminish tonight and through the weekend with period becoming 7 to 8 seconds. Southwesterly winds are forecast over the near shore coastal waters this weekend. A moderate southerly swell will arrive on Sunday and persist through early next week with light northwesterly swell continuing through the period.


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 232025
afdmtr
area forecast discussion
national weather service san francisco bay area
125 pm pdt Fri aug 23 2019

Synopsis A shallow marine layer along the coast with onshore
winds will bring seasonable temperatures to the bay area today.

High pressure begins to strengthen and rebuild over the state this
weekend allowing for inland areas to warm back into the 90s.

Milder conditions will persist near the coast with a shallow
marine layer. The ridge will weaken slightly by Tuesday and
Wednesday as the remnants of tropical storm ivo pass west of the
golden gate. This may bring some increasing clouds and more
humidity to the region.

Discussion As of 1:25 pm pdt Friday... This morning's low
clouds that blanketed coastal portions of the san francisco bay
area and much of the monterey bay area continue to mix-out this
afternoon. With the exception of some stubborn low clouds
lingering around monterey, half moon bay, and around the golden
gate, much of the population across the region can expect mostly
clear skies through the rest of the afternoon. Forecast highs this
afternoon will reach the 60s to 70s along the coast with interior
locations warming to the 80s and 90s, generally falling within
several degrees of late august climatological normals.

Upper level ridge is forecast to build over the next several days,
allowing for a gradual warming trend through the weekend and into
next week for interior locations. High temperatures by Sunday and
Monday will reach the upper 80s to middle 90s for the north bay
mountains and valleys, interior east bay, south bay, as well as
interior monterey and san benito counties. Overall, heat risk for
inland areas will be low to locally moderate, mainly impacting
those sensitive to the heat. Coastal communities can expect to
see continued onshore flow that will keep temperatures in check.

Additionally, the ridge is expected to keep the marine layer
rather shallow, so morning low cloud potential will generally be
limited to the immediate coast and exposed coastal valleys.

Tropical storm ivo, presently positioned several hundred miles sw
of the tip of the baja peninsula, is forecast to move north over
the next several days and weaken as it encounters cooler waters.

Remnant mid high level moisture is expected to advect north to
the golden state by the early to middle part of next week, though
there remains plenty of uncertainty as to the track. The latest
run of the ECMWF tracks the bulk of the remnant moisture in the
700-500 mb layer offshore. The GFS brings the moisture a bit
closer to our area with increased rhs values as far east as the
sierra. Will have to continue to keep a close eye on the track of
this remnant moisture as this could introduce the possibility of
some isolated thunderstorms for higher elevations in parts of the
state. At a minimum, much of the region can expect increased
mid high clouds, as well as an increase in surface dewpoints with
southerly flow.

Aviation As of 10:56 am pdt Friday... Low clouds are quickly
clearing to the coast as a southerly surge of stratus makes a run
northward. Anticipate a return of stratus this evening and tonight
to coastal terminals as the onshore gradient increases. Confidence
is low as to the extent of the stratus intrusion overnight as the
marine layer is expected to remain shallow. Therefore have limited
cigs to mainly coastal terminals. Light onshore winds will ramp
up this afternoon to around 10 to 15 kt.

Vicinity of ksfo...VFR conditions will prevail with ifr MVFR cigs
likely to return after midnight tonight. Low confidence. Light
winds this morning becoming westerly around 15kt after 21z.

Sfo bridge approach... Similar to ksfo.

Monterey bay terminals... Ifr CIGS over kmry will scatter out
between 19z and 20z this afternoon with an early return expected
between 03z-05z this evening. Light winds this morning becoming
westerly 5 to 10kt this afternoon.

Marine As of 9:00 am pdt Friday... Northwest winds will
decrease across the area today but remain breezy over the northern
outer waters. Steep northwesterly swell at 8 to 10 seconds will
decrease today through the weekend with period becoming 7 to 8
seconds. Southwesterly winds are forecast over the near shore
coastal waters this weekend. A moderate southerly swell will
arrive on Sunday and persist through early next week with light
northwesterly swell continuing through the period.

Mtr watches warnings advisories
Tday Sca... Pt arena to pigeon pt 10-60 nm
sca... Sf bay
public forecast: rowe
aviation: cw
marine: cw
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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 mi46 min 61°F5 ft
FTPC1 - 9414290 - San Francisco, CA 17 mi52 min WSW 12 G 20 62°F 63°F1010.2 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi26 min S 12 G 16 60°F 59°F1011 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi46 min WSW 8 G 16 66°F 1008.7 hPa (-0.6)
PXSC1 19 mi46 min 66°F 58°F
AAMC1 - 9414750 - Alameda, CA 20 mi52 min W 8.9 G 12 68°F 72°F1010.1 hPa
RTYC1 - 9414523 - Redwood City, CA 20 mi46 min NNW 8 G 13 73°F 76°F1009.5 hPa (-0.9)
OBXC1 21 mi46 min 65°F 61°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi46 min WNW 13 G 15 64°F 1009.6 hPa (-0.6)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi52 min W 14 G 18
LNDC1 22 mi46 min WNW 9.9 G 12 68°F 1009.5 hPa (-0.7)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 23 mi29 min W 22 63°F 1009 hPa
RCMC1 - 9414863 - Richmond, CA 26 mi46 min 68°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 26 mi46 min SW 12 G 16 65°F 1010 hPa
PRYC1 - 9415020 - Point Reyes, CA 36 mi46 min 52°F1010.5 hPa (-0.3)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi46 min SW 18 G 21 70°F 1008.1 hPa (-1.1)
UPBC1 40 mi46 min W 19 G 22
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi52 min W 15 G 17 75°F 74°F1007.9 hPa
PCOC1 - 9415144 - Port Chicago, CA 44 mi46 min WSW 16 G 20 78°F 72°F1007.6 hPa (-1.1)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi52 min NW 13 G 17 81°F 1006.9 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 mi51 minSSW 12 G 179.00 miOvercast64°F57°F78%1011.2 hPa
San Francisco, San Francisco International Airport, CA12 mi50 minNNE 510.00 miA Few Clouds78°F59°F52%1008.7 hPa
San Carlos Airport, CA18 mi59 minWNW 710.00 miClear77°F59°F54%1009.1 hPa
Oakland, Metro Oakland International Airport, CA21 mi53 minNW 1410.00 miA Few Clouds75°F59°F58%1009.5 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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Last 24hrNW12NW11NW9NW5NW5NW4CalmNW3CalmCalmCalmSE6SE4SE5SE8SE8SE9S9S14S12
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1 day agoNW12
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N10NW8N5NW8NW5W3CalmNW6NW5N6NW7NW6NW7NW8NW8NW10NW11
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2 days agoNW10NW10NW10NW10NW9N7NW4CalmCalmNE4CalmCalmCalmCalmCalmCalmCalmE3NW7NW7NW9NW11NW12
G22
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Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Fri -- 05:16 AM PDT     3.51 feet High Tide
Fri -- 06:32 AM PDT     Sunrise
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 10:21 AM PDT     2.63 feet Low Tide
Fri -- 02:06 PM PDT     Moonset
Fri -- 04:44 PM PDT     5.25 feet High Tide
Fri -- 07:51 PM PDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.622.533.33.53.53.332.82.62.733.54.14.75.15.24.94.33.42.51.71.2

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Fri -- 12:28 AM PDT     0.00 knots Slack
Fri -- 03:17 AM PDT     0.80 knots Max Flood
Fri -- 06:32 AM PDT     Sunrise
Fri -- 07:00 AM PDT     -0.00 knots Slack
Fri -- 07:58 AM PDT     Last Quarter
Fri -- 09:16 AM PDT     -0.75 knots Max Ebb
Fri -- 11:52 AM PDT     0.00 knots Slack
Fri -- 02:07 PM PDT     Moonset
Fri -- 03:13 PM PDT     0.76 knots Max Flood
Fri -- 06:29 PM PDT     -0.00 knots Slack
Fri -- 07:52 PM PDT     Sunset
Fri -- 09:47 PM PDT     -1.36 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.20.20.60.80.80.60.30-0.4-0.7-0.6-0.300.30.60.80.70.50.2-0.2-0.8-1.2-1.3-1.1

Weather Map and Satellite Images
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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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (18,4,5,8)
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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.