Friday, April3, 2020
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Marine Weather and Tides
Boulder Creek, 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 6:48AMSunset 7:34PM Friday April 3, 2020 9:23 AM PDT (16:23 UTC) Moonrise 1:35PMMoonset 3:18AM Illumination 81% Phase: Waxing Gibbous; Moon at 10 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- 848 Am Pdt Fri Apr 3 2020
.small craft advisory in effect through late tonight...
Today..NW winds 20 to 30 kt with occasional gusts up to 35 kt. Wind waves 5 to 6 ft, increasing to 7 to 8 ft this afternoon. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 15 seconds.
Tonight..NW winds 15 to 25 kt with occasional gusts up to 35 kt. Wind waves 5 to 6 ft. Mixed swell nw around 3 ft at 10 seconds and S around 2 ft at 15 seconds.
Sat..SW winds 5 to 15 kt. Wind waves 2 to 3 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 20 kt with gusts up to 25 kt. Wind waves 3 to 4 ft. Mixed swell nw 3 to 4 ft at 10 seconds and S around 2 ft at 14 seconds. A chance of rain.
Sun..S winds 20 to 25 kt with occasional gusts up to 35 kt. Wind waves 5 to 6 ft. W swell 3 to 5 ft at 10 seconds and S around 2 ft at 13 seconds. Rain.
Sun night..SW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 1 to 2 ft. W swell 4 to 5 ft at 9 seconds and S around 2 ft at 13 seconds. Rain likely.
Mon..NW winds up to 10 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft and S around 2 ft. A chance of rain.
Tue..NW winds up to 10 kt. Wind waves 1 to 2 ft. W swell 5 to 7 ft and S 2 to 3 ft.
PZZ500 848 Am Pdt Fri Apr 3 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Strong northwest winds will generate fresh and steep wind waves creating hazardous conditions for smaller vessels. Winds will then subside by early Saturday morning. A cold upper level low from the gulf of alaska will bring wet weather to the coastal waters and bays this weekend and next week. A moderate northwesterly swell will prevail through much of the forecast period.


7 Day Forecast for Marine Location Near Boulder Creek, CA
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location: 37.13, -122.29     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 031200 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 500 AM PDT Fri Apr 3 2020

SYNOPSIS. Sunny and mild weather today with clouds increasing by tonight ahead of the Saturday cold front. Light rain develops in the North Bay Saturday morning spreading across the Bay Area Saturday afternoon and evening. A second system drops down the coast Sunday keeping a steady rain going for much of the day across the region. Precipitation becomes more showery Sunday night into Monday as the upper low drops down the coast. The parent low will cut-off over Southern California keeping temperatures below normal and the chance of showers in the forecast through midweek.

DISCUSSION. as of 3:20 AM PDT Friday . Skies are mostly clear with just some patchy clouds so far in favored locations such as Half Moon Bay and Monterey. Today will be one last quiet weather days with sunshine and highs generally in the 60s. By tonight clouds will be on the increase as the first shortwave drops down from the Gulf of Alaska. Model timing remains consistent and expect rain to develop in the North Bay by around 12z Saturday morning. Light rain slowly spreads southward across the Bay area through lunchtime and the afternoon hours of Saturday with the front losing much of its punch by the time it reaches the Central Coast. Rain amounts by Saturday evening should be up to a half inch in the North Bay with 0.10-0.25 Bay Area southward and little or no rainfall south of Salinas.

There are some subtle but noteworthy changes for the Sunday system. The 00z and 06z NAM keep the core of the upper low and associated cold air farther offshore. The end result will still be a rainy Sunday across the Bay Area as the slow moving boundary impacts the region. The convective parameters dont look nearly as impressive compared to 24 hours ago and snow levels will be much higher through Sunday afternoon with 850 mb temps above zero. Other factor to watch will be the position of the low may induce more unfavorable southeast wind flow versus southwest upslope flow. So some of the exciting meteorological factors are fading on Sunday (t-storms, lowering snow levels, etc) but still expecting a soaking rainfall.

On Sunday night into Monday the coldest air aloft may pass over the region with precip becoming more showery. Forecast will now show t-storm chances on Monday afternoon. Rainfall totals by Monday evening of 0.50-1.00 lower elevations with 1-2 inches for the hills.

ECMWF keeps the low wobbling around Pt Conception right through Weds so lingering showers, especially from the Santa Cruz mtns southward remain in the forecast for Tuesday/Weds with temps running below seasonal norms. The low may finally eject by Thursday/Friday of next week.

AVIATION. as of 5:00 AM PDT Friday . For 12Z TAFs. It's VFR except for patchy MVFR ceilings vicinity KHAF and KSNS. Cirrus clouds are arriving from the northwest. A warm front approx 600 miles to our west arrives Saturday morning with light rain. Lower level winds are gusty over the coastal waters with some overlap of gusty winds reaching the immediate coastline today. Surface winds forecasts for tonight and Saturday morning are a tough call since night-time stability may be enough to decouple surface winds from gusty winds aloft, difficult to say due to varying temperature advection and lower level evaporative cooling until the warm front arrives Saturday.

Vicinity of KSFO . VFR, west wind near 15 knots this morning becoming gusty to 25 to 30 kt by late morning or early afternoon. Increasing clouds tonight, cloud ceilings lowering to MVFR by 14z Saturday with light rain developing.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Lower level cooling over the southern Monterey Bay is causing low level clouds to form, occasionally resulting in MVFR ceilings. Generally VFR mid to late morning, VFR in the afternoon. West winds gusting to 20 knots.

MARINE. as of 4:37 AM PDT Friday . Strong northwest winds will generate fresh and steep wind generated waves creating hazardous conditions for smaller vessels. Winds will then subside by early Saturday morning. A cold upper level low from the Gulf of Alaska will bring wet weather to the coastal waters and bays this weekend and next week. A moderate northwesterly swell will prevail through much of the forecast period.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pt Reyes to Pigeon Pt 0-10 nm SCA . Pigeon Pt to Pt Pinos 0-10 nm SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Arena to Pigeon Pt 10-60 nm SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm



PUBLIC FORECAST: RWW AVIATION/MARINE: Canepa

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46042 - MONTEREY - 27NM West of Monterey Bay, CA 25 mi34 min NNW 19 G 23 52°F 56°F10 ft1020 hPa44°F
RTYC1 - 9414523 - Redwood City, CA 26 mi54 min SW 4.1 G 6 50°F 60°F1019.7 hPa
46114 - West Monterey Bay, CA 28 mi24 min 56°F9 ft
46092 - MBM1 30 mi116 min N 5.8 50°F 54°F1018.7 hPa
MLSC1 - Moss Landing, South Harbor, CA 35 mi34 min WNW 1.9 G 6 46°F 1020.2 hPa (+0.8)43°F
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 35 mi24 min NW 23 G 29 51°F 54°F1020.2 hPa44°F
ELXC1 - Elkhorn Slough Reserve, CA 36 mi99 min Calm 44°F 1034 hPa42°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 40 mi24 min 58°F4 ft
MEYC1 42 mi48 min NW 8.9 G 14 50°F 60°F1019.6 hPa
AAMC1 - 9414750 - Alameda, CA 44 mi54 min ENE 1 G 4.1 50°F 59°F1019.2 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 46 mi54 min NNW 5.1 G 8
PXOC1 - 9414311 - San Francisco (Pier 1), CA 46 mi54 min N 2.9 G 5.1 50°F 1018.2 hPa
LNDC1 46 mi54 min NNW 4.1 G 6 50°F 1019.1 hPa
OBXC1 47 mi54 min 50°F 35°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi54 min N 6 G 7 50°F 1019.2 hPa
PXSC1 47 mi54 min 52°F 36°F
FTPC1 - 9414290 - San Francisco, CA 48 mi54 min S 1.9 G 2.9 50°F 58°F1019.2 hPa
46237 - San Francisco Bar, CA (142) 49 mi54 min 53°F6 ft

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)
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Tide / Current Tables for Ano Nuevo Island, California
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Ano Nuevo Island
Click for Map
Fri -- 01:02 AM PDT     2.78 feet Low Tide
Fri -- 04:18 AM PDT     Moonset
Fri -- 06:26 AM PDT     4.60 feet High Tide
Fri -- 06:51 AM PDT     Sunrise
Fri -- 01:39 PM PDT     -0.36 feet Low Tide
Fri -- 02:34 PM PDT     Moonrise
Fri -- 07:34 PM PDT     Sunset
Fri -- 08:40 PM PDT     4.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.92.82.93.33.84.34.64.54.13.32.21.10.2-0.3-0.30.10.81.72.63.444.13.83.3

Tide / Current Tables for Santa Cruz, California
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Santa Cruz
Click for Map
Fri -- 01:07 AM PDT     2.90 feet Low Tide
Fri -- 04:16 AM PDT     Moonset
Fri -- 06:31 AM PDT     4.74 feet High Tide
Fri -- 06:49 AM PDT     Sunrise
Fri -- 01:38 PM PDT     -0.34 feet Low Tide
Fri -- 02:33 PM PDT     Moonrise
Fri -- 07:32 PM PDT     Sunset
Fri -- 09:05 PM PDT     4.12 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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32.933.33.84.44.74.74.33.42.31.20.3-0.2-0.30.10.71.62.53.33.94.143.5

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (12,3,4,5)
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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.