Wednesday, April8, 2020
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Marine Weather and Tides
Hayward, CA

Version 3.4
NOTICE
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 6:40AMSunset 7:39PM Wednesday April 8, 2020 12:01 PM PDT (19:01 UTC) Moonrise 7:42PMMoonset 6:24AM Illumination 99% Phase: Waning Gibbous; Moon at 16 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- 829 Am Pdt Wed Apr 8 2020
Today..SW winds 5 to 15 kt.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt.
Thu..S winds up to 10 kt.
Thu night..W winds 5 to 10 kt.
Fri..W winds 5 to 15 kt with gusts up to 25 kt.
Fri night..W winds 5 to 15 kt.
Sat..SW winds up to 10 kt.
Sun..NW winds up to 10 kt.
PZZ500 829 Am Pdt Wed Apr 8 2020
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 today as the upper low slowly exits the region. Locally breezy winds will persist over the northern outer waters into this afternoon. Moderate northwest swell through the rest of the week along with a longer period southerly swell.


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 081732 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 1032 AM PDT Wed Apr 8 2020

SYNOPSIS. Isolated to scattered rain showers will be possible over the Central Coast through midweek while mainly dry conditions prevail to the north. Temperatures will begin a gradual warming trend late in the week and into the upcoming weekend as conditions dry out region-wide.

DISCUSSION. as of 09:00 AM PDT Wednesday . The 551dm 500mb upper low that first arrived in the region this last Sunday continues to loom in the vicinity, now centered over the Channel Islands off of Point Conception in Southern California. KMUX radar continues to show wrap around showers associated with this storm system advancing towards the WNW from the Central Valley and into the Central Coast/Southern Santa Clara area early this morning. Forecast models suggests on and off showers on the lighter to occasionally moderate side will continue to be possible for the southern Counties into Thursday as the aforementioned upper low finally begins to move downstream (eastward/inland) before exiting the area by Friday. Lingering clouds and locally breezy winds along the coast are expected today and tomorrow before high pressure takes full control later Friday, this weekend, and into early next week. A general warming/drying trend is expected to be firmly in place by this weekend, with a return to above normal temperatures regionwide by Sunday. No changes planned for the current forecast package this morning -- see previous discussion for more information.

PREVIOUS DISCUSSION. as of 2:55 AM PDT Wednesday . The pesky low pressure system that brought a variety of weather to the Bay Area and Central Coast the last few days remains off the coast. Overnight satellite imagery shows a broad circulation, with embedded smaller circulations, spinning near the Channel Islands. The cyclonic flow continues to advect moisture around the slow moving low pressure. The advecting moisture has resulted in bands of scattered showers moving over the San Joaquin Valley and southern Monterey/San Benito. Over the last six hours a few gauges have tipped in southern Monterey/San Benito with a few hundredths up to a few tenths. It should be noted shower activity is struggling to have any additional northern movement. Latest hi-res models, like the HRRR and local WRF, keep showers chances through day, but mainly south of San Jose. In fact, most likely locations for showers will still be confined to Monterey/San Benito, but a stray shower could drift north. The cold low pressure will make for an interesting split with temperatures around the Bay Area/Central Coast. Southern areas will remain seasonably cool with filtered sunshine/showers (Monterey Bay region southward) and northern areas will be mild an in a few spots above normal (San Jose northward).

For tonight, the low finally moves eastward and begins its slow exit of California. Before it finally exits a few additional bands of showers may drift across the forecast area Wednesday night and Thursday. Once again, best chance for precip will be south of San Jose. Additional rainfall will generally be light. Given the recent rain and lingering low level moisture patchy fog will be possible Wednesday night and early Thursday.

Showers will end by Thursday night with a warming and drying trend developing. Warmer and drier conditions are expect over the weekend and into early next week.

AVIATION. as of 10:31 AM PDT Wednesday . for 18Z TAFs. Patchy stratus remains along the coast, over the Bay Area, and around the Monterey Bay. A layer of mid to high level cloud around 10,000 to 15,000 ft AGL is making it difficult to see the extent of low clouds a the surface. Observations show VFR conditions over the parts of the North and East Bay with MVFR conditions elsewhere due to low cigs. Intermittent VFR/MVFR conditions the rest of the morning with the possibility of low clouds lingering around into the early afternoon. May be a period of VFR conditions this afternoon before low clouds return this evening. Variable winds again this morning becoming onshore this afternoon at 10-15 kt.

Some of the MOS guidance is showing increasing southeasterly winds around San Jose tomorrow morning (on the order of 25 to 30 kt gusts). Not including this into the taf at the moment. Will keep an eye on model trends this afternoon and evening.

Vicinity of KSFO . After a brief break earlier this morning it appears that stratus has rebuilt in over parts of the SF Bays with both KOAK and KSFO reporting BKN to OVC conditions at around 1500 ft AGL. Low clouds may linger over the next couple of hours, but thus far expecting cigs to lift this afternoon. Should this not be the case, tafs will be updated. After brief VFR conditions this afternoon, expecting low clouds to redevelop this evening with MVFR cigs prevailing overnight and through tomorrow morning. Variable winds again this morning at times around 10 kt should become onshore by this afternoon (10-15 kt).

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Low clouds remain over the Bay and terminals this morning with an additional layer of mid to high level clouds at 10,000 to 15,000 ft making it difficult to see the surface. Models and guidance show MVFR cigs remaining over the peninsula through the afternoon with some lifting possible before cigs lower again this evening. KSNS may see VFR conditions this afternoon, though confidence is low. MVFR conditions to prevail this evening and overnight. Onshore winds this afternoon 10-15 kt.

MARINE. as of 08:29 AM PDT Wednesday . Northwest winds will continue to diminish today as the upper low slowly exits the region. Locally breezy winds will persist over the northern outer waters into this afternoon. Moderate northwest swell through the rest of the week along with a longer period southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Arena to Pigeon Pt 10-60 nm until 3 PM



PUBLIC FORECAST: DRP AVIATION: AS MARINE: AS

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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 mi43 min N 5.1 G 6 56°F 59°F1015.5 hPa
AAMC1 - 9414750 - Alameda, CA 13 mi43 min SW 4.1 G 5.1 53°F 58°F1015.3 hPa
LNDC1 14 mi43 min SW 5.1 G 6 53°F 1015.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 16 mi49 min SW 8.9 G 11
OBXC1 16 mi43 min 53°F 51°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 16 mi43 min SSW 5.1 G 8 53°F 1015.4 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 18 mi43 min W 2.9 G 8.9 53°F 1014.3 hPa
PXSC1 18 mi43 min 54°F 52°F
FTPC1 - 9414290 - San Francisco, CA 21 mi43 min 58°F
PPXC1 - 9414847 - Richmond (Point Potrero), CA 23 mi43 min SSW 8 G 12 53°F 1015.5 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 25 mi27 min SSE 5.1 52°F 1015 hPa
RCMC1 - 9414863 - Richmond, CA 25 mi43 min S 7 G 13 53°F 57°F1014.8 hPa
46237 - San Francisco Bar, CA (142) 28 mi31 min 55°F5 ft
UPBC1 29 mi43 min WNW 5.1 G 7
MZXC1 - 9415102 - Martinez-Amorco CA 29 mi43 min WNW 5.1 G 8 57°F 58°F1014.4 hPa
PCOC1 - 9415144 - Port Chicago, CA 31 mi43 min WNW 7 G 8 57°F 58°F1014 hPa
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 31 mi43 min WSW 9.9 G 13 55°F 1014.2 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 32 mi49 min NW 7 G 11 59°F 1014.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 38 mi21 min WSW 1.9 G 3.9 51°F 52°F1016 hPa
SFXC1 - San Francisco Bay Reserve, CA 41 mi76 min W 7
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 43 mi21 min NW 3.9 G 5.8 51°F 53°F1016.2 hPa49°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 mi67 minN 010.00 miMostly Cloudy56°F46°F70%1016 hPa
Oakland, Metro Oakland International Airport, CA7 mi68 minW 610.00 miOvercast57°F48°F72%1015.7 hPa
San Carlos Airport, CA8 mi73 minNE 510.00 miOvercast55°F50°F82%1014.9 hPa
Palo Alto Airport, CA10 mi74 minN 010.00 miMostly Cloudy55°F48°F77%1015.2 hPa
San Francisco, San Francisco International Airport, CA11 mi65 minW 69.00 miOvercast56°F48°F75%1015 hPa
Livermore, Livermore Municipal Airport, CA18 mi68 minN 010.00 miFair57°F46°F67%1014.2 hPa
Half Moon Bay Airport, CA20 mi61 minSSE 31.75 miFog/Mist50°F48°F94%1015.9 hPa
San Jose, San Jose International Airport, CA21 mi68 minS 510.00 miMostly Cloudy57°F45°F64%1015 hPa

Link to 5 minute data for KHWD

Wind History from HWD (wind in knots)
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Last 24hrW7W9W10W11W12NW14W15W12NW8W7NW4W4NE4S3SW4SW5S4N3CalmSW3CalmW6W5Calm
1 day agoCalmSE83S4SW3CalmW6NW5CalmCalmCalmCalmE5E5NE3NE6E5NE5NE4NE3NE3CalmN3Calm
2 days agoS6W6W7W7W5NW9W3W6W4W6N3CalmNE4NE6NE6E3E3NE6CalmNE5NE4NE6NE3Calm

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
Wed -- 01:09 AM PDT     7.92 feet High Tide
Wed -- 06:42 AM PDT     Sunrise
Wed -- 07:24 AM PDT     Moonset
Wed -- 07:37 AM PDT     -0.27 feet Low Tide
Wed -- 01:38 PM PDT     7.43 feet High Tide
Wed -- 07:38 PM PDT     Sunset
Wed -- 07:45 PM PDT     0.57 feet Low Tide
Wed -- 08:41 PM PDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.27.97.66.44.62.60.9-0.1-0.20.82.44.36.17.27.46.75.23.51.80.80.61.42.94.8

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
Wed -- 12:48 AM PDT     -0.00 knots Slack
Wed -- 03:52 AM PDT     -1.02 knots Max Ebb
Wed -- 06:42 AM PDT     Sunrise
Wed -- 06:58 AM PDT     0.00 knots Slack
Wed -- 07:24 AM PDT     Moonset
Wed -- 10:18 AM PDT     1.36 knots Max Flood
Wed -- 01:27 PM PDT     -0.01 knots Slack
Wed -- 04:17 PM PDT     -0.88 knots Max Ebb
Wed -- 07:16 PM PDT     0.00 knots Slack
Wed -- 07:38 PM PDT     Sunset
Wed -- 08:42 PM PDT     Moonrise
Wed -- 10:28 PM PDT     1.20 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.6-0.1-0.6-0.9-1-0.8-0.500.61.11.41.30.90.3-0.3-0.7-0.9-0.8-0.5-0.10.40.91.21.2

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.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (15,3,4,5)
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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 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.