Tuesday, October27, 2020
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Marine Weather and Tides
Montara, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:29AMSunset 6:18PM Tuesday October 27, 2020 9:00 AM PDT (16:00 UTC) Moonrise 3:56PMMoonset 2:44AM Illumination 83% 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 Coastal Waters From Point Reyes To Pigeon Point California Out To 10 Nm- 808 Am Pdt Tue Oct 27 2020
Today..N winds 5 to 15 kt, becoming nw this afternoon. Wind waves 3 to 4 ft. NW swell 2 to 4 ft at 9 seconds and W 2 to 3 ft at 14 seconds.
Tonight..SW winds up to 10 kt. Wind waves 1 to 2 ft. NW swell 2 to 3 ft at 9 seconds and nw 2 to 3 ft at 13 seconds.
Wed..S winds up to 10 kt. NW swell 2 to 3 ft at 11 seconds and nw around 2 ft at 12 seconds.
Wed night..NW winds around 5 kt. Wind waves 1 ft. NW swell 2 to 3 ft at 10 seconds and nw up to 2 ft at 12 seconds.
Thu..NW winds 5 to 10 kt. Wind waves 1 ft. NW swell around 2 ft at 9 seconds.
Thu night..W winds 5 to 10 kt. Wind waves 1 ft. NW swell around 2 ft at 8 seconds.
Fri..NW winds 5 to 10 kt. Wind waves 1 ft. NW swell around 2 ft.
Sat..N winds 5 to 15 kt. Wind waves 1 ft. NW swell around 2 ft and sw up to 2 ft.
...san francisco bar/fourfathom bank forecast..... In the deep water channel...seas 2 to 3 ft with a dominant period of 9 seconds. Across the bar...seas 4 to 5 ft with dominant swell period of 9 seconds. Maximum ebb current of 2.6 kt at 02:49 pm Tuesday and 1.8 kt at 03:01 am Wednesday.
PZZ500 808 Am Pdt Tue Oct 27 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Generally light to locally moderate northerly winds will prevail across the waters. Winds will turn southerly along the immediate coastline tonight, though will remain relatively light. Mixed seas will continue through the period with a pair of northwest swell trains in addition to a lighter southerly swell and some weak wind waves.


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 271147 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 447 AM PDT Tue Oct 27 2020

SYNOPSIS. Critical fire weather conditions will persist in the North Bay Mountains, East Bay Hills and the Diablo Range into Tuesday afternoon where gusty winds persist. Elsewhere, winds will remain light, yet dry conditions will persist through midweek. High pressure will bring sunny, mild afternoons and cool overnights through the remainder of the week.

DISCUSSION. as of 02:30 AM PDT Tuesday . Moderate to locally gusty conditions persist early this morning in the higher ridges and peaks of interior portions of the North and East Bay with relative humidity in single digits to teens. Additionally, wind gusts range from 45-60 mph in the highest peaks. Critical fire weather conditions will continue in the aforementioned locations where a Red Flag Warning remains in effect through 5 PM PDT Tuesday. Elsewhere, breezy conditions continue in the hills wild light and variable winds are common in the region's lower elevations. That said, dry conditions persist for much of the region as a cool, dry air mass settles into the region. If not for mixing from the stronger winds aloft, temperatures in the interior valleys of the North and East Bay would likely be much cooler this morning. Currently, temperatures are in the upper 40s to lower 50s in these areas and will likely bottom out in the low/mid 40s with a few of the coldest spots cooling into the upper 40s. Meanwhile, interior portions of Monterey and San Benito Counties will likely see more widespread 30s this morning.

Winds will gradually ease region-wide through midweek with a slight increase in humidity expected during the latter half of the week. Thus, fire weather concerns will diminish through the remainder of the week. Dry conditions will prevail however for much of the week as high pressure over the eastern Pacific builds near the West Coast. This will result in mild daytime temperatures generally warming into the 70s to lower 80s under mostly sunny sky conditions. Overnight temperatures will range from the 40s to lower 50s for most urban areas while remaining slightly warmer in the hills.

Medium-range models indicate the ridge aloft will weaken slightly by the upcoming weekend as a weak storm system pushes inland over the Pacific Northwest. At this time, dry weather will most likely persist through the end of the month and into early November as the storm track remains to the north. The good news, there does not appear to be any indications of additional offshore wind events in the current extended forecast period.

AVIATION. as of 4:45 AM PDT Tuesday . Continued dry air mass in place with no marine air mass intrusion expected. Thus, widespread VFR with prevailing offshore flow through the sunrise to mid morning hours, transitioning to onshore flow by the afternoon to evening. Low level wind shear of 25-30kt from the NNE expected through the early morning hours for locations on the lee side of hills or mountains in the San Francisco Bay Area.

Vicinity of KSFO . VFR through the period. Light winds at the surface with stronger winds aloft may cause LLWS overnight.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. East to southeast winds after midnight could get as strong as 10-15 kt in the Salinas Valley through mid morning.

FIRE WEATHER. as of 02:30 AM PDT Tuesday . A red flag warning remains in effect for the North Bay Mountains, East Bay Hills and the Diablo Range until 5 pm PDT Tuesday. Moderate winds with gusts of 45-60 mph are likely in the higher elevations of the interior North and East Bay into this afternoon before gradually diminishing late in the day. High pressure keeps things dry all week with warm days and cool nights. While a well established marine layer may not develop until late week, humidity levels should gradually improve in the region's lower elevations.

MARINE. as of 04:45 AM PDT Tuesday . Generally light north winds across the waters today. Winds turn south along the immediate coast Tuesday night while remaining predominately light. A pair of northwest swell trains with a lighter southerly swell will mix with some weak wind waves through the period.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Red Flag Warning . CAZ507-511



PUBLIC FORECAST: RGass AVIATION: DRP MARINE: DRP FIRE WEATHER: RGass

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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 mi60 min 57°F4 ft
FTPC1 - 9414290 - San Francisco, CA 17 mi60 min S 1.9 G 1.9 58°F 61°F1019.7 hPa (+0.8)
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 19 mi40 min N 1.9 G 3.9 57°F1019.5 hPa
PXSC1 19 mi60 min 61°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 19 mi60 min Calm G 1 60°F 1018.4 hPa (+0.6)
AAMC1 - 9414750 - Alameda, CA 20 mi60 min NNE 4.1 G 6 64°F 63°F1019.5 hPa (+0.6)
RTYC1 - 9414523 - Redwood City, CA 20 mi60 min WSW 2.9 G 5.1 60°F 67°F1019.9 hPa (+0.3)
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 21 mi60 min W 4.1 G 5.1
OBXC1 21 mi60 min 61°F 49°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 21 mi60 min NW 2.9 G 6 59°F 1019.3 hPa (+0.6)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 22 mi30 min ESE 1.9 G 5.8 58°F 1019.7 hPa55°F
LNDC1 22 mi60 min W 2.9 G 4.1 64°F 1019.3 hPa (+0.6)
TIBC1 - Tiburon Pier, San Francisco Bay, CA 23 mi49 min Calm 64°F 1019 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 26 mi60 min NNE 2.9 G 6 63°F 1019.9 hPa
RCMC1 - 9414863 - Richmond, CA 26 mi60 min E 2.9 G 5.1 63°F 62°F1019.4 hPa (+0.8)
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 38 mi60 min E 15 G 18 61°F 1019.1 hPa (+0.6)
MZXC1 - 9415102 - Martinez-Amorco CA 40 mi60 min E 4.1 G 6 58°F 63°F1020 hPa (+0.6)
UPBC1 40 mi60 min ENE 7 G 9.9
PCOC1 - 9415144 - Port Chicago, CA 44 mi60 min NE 8 G 11 57°F 63°F1019.7 hPa (+0.9)
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 49 mi60 min S 1.9 G 4.1 55°F 1019.8 hPa (+0.7)

Wind History for San Francisco, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Half Moon Bay Airport, CA6 mi65 minN 310.00 miFair54°F24°F33%1019.3 hPa
San Francisco, San Francisco International Airport, CA12 mi64 minE 610.00 miA Few Clouds65°F34°F32%1019.2 hPa
San Carlos Airport, CA18 mi64 minNW 610.00 miClear61°F21°F22%1019.6 hPa
Oakland, Metro Oakland International Airport, CA21 mi67 minN 610.00 miA Few Clouds63°F16°F16%1019.3 hPa

Link to 5 minute data for KHAF

Wind History from HAF (wind in knots)
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NW9N9CalmCalmCalmCalmE3NE3CalmCalmCalmCalmW3CalmNE6
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2 days agoSE6E4S5S5S4SW6W6SW4W5SW5SE3S4SW5W6W6SW6S7S6S7S7S6S6S7S5

Tide / Current Tables for Half Moon Bay, California
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Half Moon Bay
Click for Map
Tue -- 02:29 AM PDT     0.64 feet Low Tide
Tue -- 03:43 AM PDT     Moonset
Tue -- 07:30 AM PDT     Sunrise
Tue -- 09:09 AM PDT     5.20 feet High Tide
Tue -- 03:14 PM PDT     1.48 feet Low Tide
Tue -- 04:55 PM PDT     Moonrise
Tue -- 06:16 PM PDT     Sunset
Tue -- 09:00 PM PDT     4.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.91.10.70.71.22344.85.254.43.52.51.81.51.62.12.93.74.44.74.43.8

Tide / Current Tables for South Channel, San Francisco Bay Approach, California Current
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South Channel
Click for Map
Tue -- 12:51 AM PDT     -1.31 knots Max Ebb
Tue -- 03:43 AM PDT     Moonset
Tue -- 04:08 AM PDT     0.00 knots Slack
Tue -- 07:22 AM PDT     1.30 knots Max Flood
Tue -- 07:31 AM PDT     Sunrise
Tue -- 10:37 AM PDT     -0.01 knots Slack
Tue -- 01:40 PM PDT     -1.16 knots Max Ebb
Tue -- 04:39 PM PDT     0.00 knots Slack
Tue -- 04:55 PM PDT     Moonrise
Tue -- 06:16 PM PDT     Sunset
Tue -- 07:38 PM PDT     1.08 knots Max Flood
Tue -- 10:41 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.2-1.3-1.2-0.8-0.10.61.11.31.310.4-0.3-0.9-1.1-1.2-1-0.50.20.711.10.90.4-0.2

Weather Map
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wmap_P
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station San Francisco Bay Area, CA
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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 numerous 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.