Thursday, April2, 2020
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Marine Weather and Tides
Loyola, 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 6:50AMSunset 7:32PM Wednesday April 1, 2020 10:40 PM PDT (05:40 UTC) Moonrise 11:24AMMoonset 1:37AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 832 Pm Pdt Wed Apr 1 2020
.small craft advisory in effect until 6 am pdt Thursday...
Tonight..NW winds 20 to 30 kt with gusts up to 35 kt. Wind waves 8 to 9 ft, decreasing to 5 to 6 ft after midnight. Mixed swell nw 3 to 4 ft at 11 seconds and S around 2 ft at 18 seconds.
Thu..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. Mixed swell nw 3 to 4 ft at 11 seconds and S around 2 ft at 18 seconds.
Thu night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 16 seconds.
Fri..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 6 to 7 ft. Mixed swell nw around 3 ft at 11 seconds and S around 2 ft at 16 seconds.
Fri night..NW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 15 seconds.
Sat..SW winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 15 seconds. A chance of rain.
Sat night..SW winds 10 to 15 kt. Wind waves 1 to 2 ft. Mixed swell nw 3 to 4 ft at 10 seconds and S around 2 ft at 14 seconds. Rain likely.
Sun..SW winds 5 to 15 kt. Wind waves 2 to 3 ft. W swell 4 to 6 ft and S around 2 ft. Rain likely.
Mon..W winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft and S around 2 ft. A chance of rain.
PZZ500 832 Pm Pdt Wed Apr 1 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... North-northwesterly winds remain strong with gale force gusts. These strong winds will prevail over the waters through tonight generating fresh and steep wind generated waves. Winds will back off only a slight amount Thursday, before strengthening again Thursday night. The southwesterly swell will continue to be light and persist through the week. Winds will gradually ease through the end of the week and into the weekend.


7 Day Forecast for Marine Location Near Loyola, CA
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location: 37.29, -122.14     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 020343 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 843 PM PDT Wed Apr 1 2020

SYNOPSIS. Clear and cool weather overnight into Thursday morning. Continued sunny and seasonably mild Thursday afternoon into Friday but one more cold morning Friday. A cold front arrives Saturday with light rain in the morning for the North Bay spreading over the Bay Area by afternoon. A second, stronger storm will drop down on Sunday with more rain, isolated thunderstorms and lowering snow levels to around 3000 feet. Showers linger into Monday and possibly early next week for the Central Coast as the low slowly departs.

DISCUSSION. as of 08:43 PM PDT Wednesday . As the sun set over the Bay Area most of the afternoon/evening cumulus clouds quickly dissipated. Some patchy clouds do lingering as seen by satellite imagery, webcams, and automated sensors (few-sct). Do expect these clouds to thin out even more overnight with mostly clear skies by morning. Near term weather impact concerns continue to be focused on two things: wind and overnight temperatures. Latest pressure gradient from ACV-SFO is almost 7mb, which is pretty decent. The strong gradient has resulted in gusty winds over the waters, coastline and Bay Area Hills. The latest 00z models continue to advertise a slight uptick in wind speed overnight, especially the inland higher terrain. North Bay Mts and East Bay Hills veering more to the northeast by Thursday morning. These winds are forecast to be strongest over the North Bay peaks (Mt St Helena) with some gusts over 50 mph. The valleys will be much weaker, but still hold onto some wind. That right there plays into weather impact number two - chilly overnight temperatures. Current forecast has temperatures dropping overnight into the 40s coast and SF Bay Shoreline. Inland valleys will be colder and in the 30s, possibly lower 30s. The weak valley wind will help to keep temperatures from dropping to Frost Advisory criteria. That being said, if winds do go calm in the valleys predicted dew point values would support colder overnight temperatures. Night shift will have to keep an eye on this, but for now will not update the forecast.

Pleasant afternoon weather is expected on Thursday and Friday, before wet weather returns over the weekend.

PREV DISCUSSION. as of 2:17 PM PDT Wednesday .

Main forecast item of focus then turns to wet weather this weekend. Models have been consistent in bringing rain into the North Bay by Saturday morning then spreading over the Bay Area Saturday afternoon and evening. Rain band will fall apart as it reaches the Central Coast with little or no rainfall south of Salinas. The Saturday system looks light/moderate strength with rain amounts 0.25-0.50 for the Bay Area.

A second stronger system will drop down the coast on Sunday with another round of rain followed by thunderstorms with small hail. Snow levels will lower to around 3000 feet in the North Bay and 3500 feet Bay Area/Central Coast. Daytime highs this weekend will be cold due to precip/cloud cover with highs struggling to reach 60 degrees. Storm totals (including Saturday precip) by late Sunday night/early Monday morning of 0.50-1.00 on average with 1-1.5 inches for the hills.

Showers will linger on Monday as the low slowly wobbles over Southern California. The last two runs of the ECMWF keep the low over SoCal through at least Weds which would keep shower chances going for the Central Coast but the Bay Area should be dry Tue/Weds with drier northeast flow rotating around the low. High pressure to finally build in by mid to late week as the low ejects.

AVIATION. as of 4:46 PM PDT Wednesday . for 00Z TAFs. VFR with breezy winds with occasional stronger gusts, particularly for terminals closer to the coast. Mostly clear skies around the region. Winds will subside slightly this evening and overnight. A chance for a few clouds around 1,000 feet overnight. VFR forecast for Thursday with breezier onshore winds in the afternoon.

Vicinity of KSFO . Blue skies with winds remaining strong between 18-22 knots this afternoon. Occasional stronger gusts are still possible through 04Z. Winds will ease slightly tonight, but remain onshore through the TAF period. Slight chance for some cloud cover build up around terminals in the morning. But cloud cover lifts by the late morning as winds become strengthen once again on Thursday. VFR expected with breezier onshore winds in the afternoon.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Skies remain VFR as blue skies surround the peninsula at this hour. Winds are onshore and breezy. Occasional stronger gusts are possible through 04Z. Winds will then ease through the evening and overnight period. A few clouds could develop around 1,500 feet, but by late Thursday morning, skies will be VFR once again. Winds will remain onshore and breezy Thursday afternoon.

MARINE. as of 02:44 PM PDT Wednesday . Strong gale force northwest winds will persist across the coastal waters through tonight. These strong winds will generate fresh and steep wind generated waves. In addition, a light southwesterly swell will continue through the week. Winds will gradually ease through the end of the week and into the weekend.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. SCA . Pigeon Pt to Pt Pinos 0-10 nm GLW . Pt Arena to Pigeon Pt 10-60 nm GLW . Pigeon Pt to Pt Piedras Blancas 10-60 nm GLW . Pt Arena to Pt Reyes 0-10 nm until 3 AM GLW . Pt Reyes to Pigeon Pt 0-10 nm until 3 AM GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 AM SCA . Mry Bay until 3 AM SCA . SF Bay until 9 PM



PUBLIC FORECAST: MM/RWW AVIATION: DK MARINE: CW

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 15 mi52 min 61°F
AAMC1 - 9414750 - Alameda, CA 34 mi52 min WNW 6 G 8.9 55°F 60°F1016 hPa
LNDC1 36 mi52 min NNW 8 G 11 54°F 1015.9 hPa
46042 - MONTEREY - 27NM West of Monterey Bay, CA 37 mi30 min NW 23 G 27 53°F 56°F1016.6 hPa46°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 37 mi58 min NNW 11 G 14
OKXC1 - 9414776 - Oakland (Berth 34), CA 37 mi52 min NW 11 G 13 54°F 1016 hPa
OBXC1 37 mi52 min 55°F 42°F
MLSC1 - Moss Landing, South Harbor, CA 38 mi38 min ESE 1.9 G 8 50°F 1016.3 hPa41°F
46092 - MBM1 38 mi132 min NW 19 53°F 55°F1014.2 hPa
PXOC1 - 9414311 - San Francisco (Pier 1), CA 38 mi52 min WNW 1.9 G 4.1 54°F 1015.1 hPa
PXSC1 38 mi52 min 55°F 43°F
ELXC1 - Elkhorn Slough Reserve, CA 39 mi55 min ESE 5.1 49°F 1029 hPa42°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 40 mi30 min NNW 27 G 33 52°F 56°F1017.1 hPa45°F
FTPC1 - 9414290 - San Francisco, CA 40 mi52 min 59°F
46114 - West Monterey Bay, CA 41 mi40 min 56°F11 ft
46237 - San Francisco Bar, CA (142) 43 mi40 min 54°F7 ft
PPXC1 - 9414847 - Richmond (Point Potrero), CA 44 mi52 min NW 7 G 9.9 54°F 1016.3 hPa
TIBC1 - Tiburon Pier, San Francisco Bay, CA 45 mi36 min NW 1 51°F 1016 hPa
RCMC1 - 9414863 - Richmond, CA 46 mi52 min NW 7 G 9.9 53°F 57°F1015.9 hPa
46240 - Cabrillo Point, Monterey Bay, CA (158) 48 mi40 min 58°F6 ft
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 49 mi30 min NW 25 G 31 52°F 54°F1016.8 hPa
MEYC1 49 mi64 min NW 13 G 19 52°F 60°F1016.2 hPa

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose, San Jose International Airport, CA12 mi47 minN 410.00 miA Few Clouds50°F37°F61%1016.1 hPa
Palo Alto Airport, CA13 mi53 minW 810.00 miClear52°F39°F62%1015.9 hPa
San Jose / Reid / Hillv, CA17 mi53 minN 310.00 miClear52°F39°F62%1016.3 hPa
San Carlos Airport, CA18 mi45 minW 710.00 miFair50°F41°F71%1016.6 hPa
Half Moon Bay Airport, CA24 mi45 minNNW 16 G 237.00 miA Few Clouds50°F42°F76%1016.6 hPa

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)
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Tide / Current Tables for Palo Alto Yacht Harbor, California
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Palo Alto Yacht Harbor
Click for Map
Thu -- 03:29 AM PDT     Moonset
Thu -- 03:36 AM PDT     3.36 feet Low Tide
Thu -- 06:51 AM PDT     Sunrise
Thu -- 08:22 AM PDT     7.76 feet High Tide
Thu -- 01:25 PM PDT     Moonrise
Thu -- 03:58 PM PDT     0.00 feet Low Tide
Thu -- 07:32 PM PDT     Sunset
Thu -- 09:50 PM PDT     6.51 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.14.643.53.44.15.56.97.77.66.65.23.82.41.30.400.51.83.75.36.36.56.2

Tide / Current Tables for Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current
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Dumbarton Point 2.3 mi NE
Click for Map
Thu -- 01:00 AM PDT     -0.45 knots Max Ebb
Thu -- 03:19 AM PDT     0.00 knots Slack
Thu -- 03:29 AM PDT     Moonset
Thu -- 05:39 AM PDT     0.62 knots Max Flood
Thu -- 06:51 AM PDT     Sunrise
Thu -- 08:19 AM PDT     -0.00 knots Slack
Thu -- 01:13 PM PDT     -1.13 knots Max Ebb
Thu -- 01:25 PM PDT     Moonrise
Thu -- 04:08 PM PDT     0.00 knots Slack
Thu -- 07:02 PM PDT     1.23 knots Max Flood
Thu -- 07:32 PM PDT     Sunset
Thu -- 10:25 PM PDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.4-0.3-0.10.20.60.60.40.1-0.2-0.5-0.8-1-1.1-1-0.6-0.10.61.11.21.10.80.3-0.2

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
Wind Forecast for San Francisco/Monterey Bay Area, CA (1,6,7,8)
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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.