Tuesday, December10, 2019
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Marine Weather and Tides
Hayward, CA

Version 3.4
NOTICE
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.
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 7:11AMSunset 4:51PM Tuesday December 10, 2019 11:32 AM PST (19:32 UTC) Moonrise 4:03PMMoonset 5:32AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 810 Am Pst Tue Dec 10 2019
Today..E winds up to 10 kt. A chance of rain this afternoon.
Tonight..E winds up to 10 kt. A chance of rain.
Wed..NE winds up to 10 kt. A slight chance of rain.
Wed night..E winds up to 10 kt. A slight chance of rain.
Thu..S winds up to 10 kt. A slight chance of rain.
Thu night..SW winds up to 10 kt.
Fri..W winds up to 10 kt.
Sat..W winds 5 to 15 kt. A chance of rain.
PZZ500 810 Am Pst Tue Dec 10 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A weak cold front will turn winds southerly today and bring a chance of showers this evening and into Wednesday. Light to moderate southerly winds will then continue through much of the week before shifting back out of the northwest towards the weekend. Moderate northwest swell will also persist before a longer period northwest swell arrives on Thursday. Wave heights will gradually build heading into the coming weekend creating hazardous seas conditions, particularly for smaller vessels.


7 Day Forecast for Marine Location Near Hayward, CA
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location: 37.62, -122.15     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 101800 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1000 AM PST Tue Dec 10 2019

SYNOPSIS. Dry conditions with mild temperatures are forecast through most of today. A weak weather system will produce light rain from late today into early Wednesday, mainly in the San Francisco Bay Area. A moist zonal flow will keep a chance of light rain in the forecast for much of the week, with the best chances across the North Bay. A system will bring another chance of rain on Saturday with dry weather returning Sunday and Monday.

DISCUSSION. as of 09:00 AM PST Tuesday . Stratus persists this morning across the Bay Area as the boundary layer remains moist after the weekend's rainfall. High clouds last night likely prevented the stratus from lowering to fog. Today, stratus should thin and dissipate as the heating of the day gets underway. A brief period of sunshine should develop in many places late this morning or early this afternoon before a system spreads high clouds over the area. Light rain should begin late this afternoon across the North Bay and spread south to the greater Bay Area this evening. Models weaken the trough as it approaches the California coast with further weakening as it moves south and east. As such, only light rainfall is expected across the area with very little rainfall south of the Santa Cruz Mountains. Scattered showers will persist overnight and end by early Wednesday morning. The North Bay looks to receive the most rain with amounts locally up to a half inch, and around a tenth of an inch in the greater Bay Area and East Bay. Winds will also remain relatively light, so overall impacts will be minimal.

Highs today will range from the mid 50s to lower 60s. A slight warming trend will develop on Wednesday and Thursday, with most locations seeing highs in the 60s. Overnight lows will remain mild with most sites in the upper 40s to low 50s. A moist zonal flow will develop behind today's system, with light rain again possible on Thursday and Friday. The North Bay once again looks to see the highest chance of rain but some models bring showers into the Bay Area. The current forecast remains on track, and no updates this morning. For additional details, see the Previous Discussion.

PREV DISCUSSION. As of 3:10 AM PST Tuesday . A band of thick high clouds has spread over our forecast area overnight, reducing outgoing longwave radiation. This is not only helping to keep overnight temperatures somewhat elevated, but also inhibiting fog formation. Surface relative humidity values are anywhere from 5 to 15 percent drier than 24 hours ago and fog is currently absent in most areas. Present conditions are much different than early yesterday morning when areas of dense fog had formed. High clouds are expected to persist for the remainder of the night and so any fog that does develop by daybreak is likely to remain patchy.

Less low level moisture this morning will mean earlier clearing of patchy low clouds today. Also, high clouds are expected to diminish by this afternoon. More sun today should mean slightly warmer temperatures than yesterday.

Early morning satellite imagery shows a system approaching from the west out near 130W. Although this system is relatively weak, it has tapped into a relatively moist airmass from the southwest with precipitable water values as high as 1.4 inches. So, although models indicate weakening as the system moves inland over California, there should be sufficient moisture to produce at least light rain across much of the SF Bay Area from late this afternoon through tonight. A few showers may linger into Wednesday morning. Rain totals through Wednesday morning are forecast to be less than a quarter inch, except locally up to a third of an inch in the coastal hills of Sonoma County. Winds are not expected to be a factor with this system, with wind gusts of only about 20 mph forecast along the coast overnight.

Once the incoming system passes tonight, the models agree that a moist zonal flow will develop across the Eastern Pacific and into the Pacific Northwest and far northern California. Weak impulses moving through this moist zonal flow may generate light rain as far south as the North Bay from time to time from late Wednesday through Friday night. A shortwave trough moving in from the northwest late in the week may then generate more widespread rainfall across our area on Saturday. However, the models have been backing off on precipitation potential on Saturday, and where rain does fall, amounts are expected to be light. Rainfall totals for the entire week, from late today through Saturday, are forecast to be a quarter of an inch of less from San Francisco southward . and from 0.25 to 1" in the North Bay. Onshore flow through the week will maintain seasonable daytime temperatures and mild nighttime temps.

Dry weather is expected to return to the entire forecast area on Sunday and Monday. Longer range models maintain a progressive pattern into next week, with at least two systems potentially impacting our area. The systems next week, while not currently expected to be overly strong or wet, at least appear likely to generate more widespread and significant rainfall than what is forecast this week.

AVIATION. as of 10:00 AM PST Tuesday . For 18Z TAFs. Challenging aviation forecast as high clouds are masking the near- surface stratus decks on satellite imagery from time-to-time. Latest TAF package in the short-term is based on present satellite trends . terminals are ranging anywhere from VFR to IFR conditions. Confidence is low to moderate for sites that are reporting MFVR/IFR ceilings. A weak system will approach the Bay Area late afternoon/overnight and bring generally light rain to terminals. Winds are forecast to remain light.

Vicinity of KSFO . Difficult forecast for SFO as high clouds have periodically blocked satellite view of the stratus. Latest satellite trends show stratus developing and surging north from the terminal toward the City. Confidence is low in the short-term as to how this stratus deck will behave. With the low December sun angle, it may take several more hours for the terminal to transition to scattered. Light easterly winds will likely prevail into the afternoon hours, becoming light out of the southeast overnight. Chance of light rain enters the picture after sunset as a weak system approaches the region.

SFO Bridge Approach . Southern half of the San Francisco Bay is largely clear according to the most recent visible satellite trends. Stratus is located just to the north of the San Mateo Bridge and extends north all the way to the terminal. Expect gradual clearing over the next several hours, but the low December sun angle could slow down the stratus mix-out. Otherwise, similar to the terminal.

Monterey Bay Terminals . VFR conditions are expected through much of the day. Southeast winds around 10-15 kt will continue through midday at SNS with lighter winds at MRY. Possible return of the low clouds late afternoon or evening.

MARINE. as of 08:10 AM PST Tuesday . A weak cold front will turn winds southerly today and bring a chance of showers this evening and into Wednesday. Light to moderate southerly winds will then continue through much of the week before shifting back out of the northwest towards the weekend. Moderate northwest swell will also persist before a longer period northwest swell arrives on Thursday. Wave heights will gradually build heading into the coming weekend creating hazardous seas conditions, particularly for smaller vessels.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: ST/Dykema AVIATION: Rowe MARINE: Rowe

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 8 mi50 min W 1.9 G 2.9 55°F 57°F1025.2 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi50 min 55°F
LNDC1 14 mi50 min S 6 G 8 55°F 1024.7 hPa
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi50 min SSW 6 G 7 55°F 1024.9 hPa
OBXC1 16 mi50 min 55°F 53°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 18 mi44 min SE 5.1 G 8 53°F 1024.2 hPa
FTPC1 - 9414290 - San Francisco, CA 21 mi50 min Calm G 0 57°F 54°F1025.6 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi44 min W 4.1 G 6 55°F 1025.4 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 25 mi39 min NNW 7 53°F 1025 hPa (+0.0)
RCMC1 - 9414863 - Richmond, CA 25 mi50 min NW 6 G 7 54°F 54°F1024.8 hPa
46237 - San Francisco Bar, CA (142) 28 mi32 min 54°F3 ft
UPBC1 29 mi44 min ENE 7 G 8.9
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi50 min NE 6 G 7 51°F 54°F1025.1 hPa
PCOC1 - 9415144 - Port Chicago, CA 31 mi50 min ENE 6 G 8 51°F 53°F1024.9 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 31 mi44 min ESE 8 G 9.9 53°F 1024.9 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 32 mi50 min ESE 8.9 G 11 52°F 1025.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 38 mi22 min E 5.8 G 7.8 54°F 56°F1025.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 41 mi107 min E 5.1 50°F 1025 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi22 min SSW 3.9 G 5.8 54°F 57°F1025.3 hPa48°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hayward, Hayward Air Terminal, CA3 mi38 minN 010.00 miFair58°F48°F70%1025.5 hPa
Oakland, Metro Oakland International Airport, CA7 mi39 minSW 610.00 miPartly Cloudy57°F48°F74%1025.1 hPa
San Carlos Airport, CA8 mi45 minVar 310.00 miPartly Cloudy54°F50°F88%1025.1 hPa
Palo Alto Airport, CA10 mi45 minVar 510.00 miPartly Cloudy57°F48°F72%1024.7 hPa
San Francisco, San Francisco International Airport, CA11 mi96 minN 09.00 miMostly Cloudy55°F46°F74%1024.7 hPa
Livermore, Livermore Municipal Airport, CA18 mi39 minNE 97.00 miPartly Cloudy54°F48°F80%1024.3 hPa
Half Moon Bay Airport, CA20 mi37 minW 610.00 miMostly Cloudy55°F48°F77%1025.4 hPa
San Jose, San Jose International Airport, CA21 mi39 minSSE 310.00 miA Few Clouds57°F46°F69%1024.1 hPa

Link to 5 minute data for KHWD

Wind History from HWD (wind in knots)
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Last 24hr3CalmCalmCalmNW4NW5NW4NW3CalmCalmCalmE3CalmCalmCalmCalmNE5NE8NE7NE4CalmE5S4Calm
1 day agoW4CalmW7W9NW9W5NW7NW5CalmCalmNE4CalmCalmCalmSE3E3E4NE5NE3NE4CalmE3CalmCalm
2 days agoS18
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Tide / Current Tables for San Mateo Bridge (east end), San Francisco Bay, California
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San Mateo Bridge (east end)
Click for Map
Tue -- 04:40 AM PST     2.40 feet Low Tide
Tue -- 05:32 AM PST     Moonset
Tue -- 07:12 AM PST     Sunrise
Tue -- 10:24 AM PST     7.98 feet High Tide
Tue -- 04:03 PM PST     Moonrise
Tue -- 04:50 PM PST     Sunset
Tue -- 05:43 PM PST     -0.38 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.15.54.43.32.62.43.14.35.87.17.97.97.15.73.92.10.6-0.2-0.30.31.534.55.7

Tide / Current Tables for Mulford Gardens Channel #2 SSW, South San Francisco Bay, California Current
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Mulford Gardens Channel #2 SSW
Click for Map
Tue -- 01:23 AM PST     -0.46 knots Max Ebb
Tue -- 04:13 AM PST     0.00 knots Slack
Tue -- 05:32 AM PST     Moonset
Tue -- 07:12 AM PST     Sunrise
Tue -- 07:25 AM PST     0.80 knots Max Flood
Tue -- 10:15 AM PST     -0.01 knots Slack
Tue -- 01:38 PM PST     -0.92 knots Max Ebb
Tue -- 04:03 PM PST     Moonrise
Tue -- 04:50 PM PST     Sunset
Tue -- 05:11 PM PST     0.01 knots Slack
Tue -- 08:30 PM PST     1.03 knots Max Flood
Tue -- 11:48 PM PST     -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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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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (14,3,4,5)
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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 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.