Tuesday, January19, 2021
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L-36.com

Marine Weather and Tides
Cambrian Park, 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 7:17AMSunset 5:20PM Tuesday January 19, 2021 9:38 AM PST (17:38 UTC) Moonrise 11:16AMMoonset 12:00AM Illumination 38% Phase: Waxing Crescent; Moon at 6 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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PZZ535 Monterey Bay- 817 Am Pst Tue Jan 19 2021
.small craft advisory in effect until 3 pm pst this afternoon...
Today..NE winds 15 to 25 kt with gusts up to 30 kt. Wind waves 4 to 5 ft, decreasing to 2 to 3 ft this afternoon. W swell 4 to 6 ft at 16 seconds.
Tonight..NE winds 5 to 15 kt with gusts up to 25 kt. Wind waves 2 to 3 ft. W swell 2 to 4 ft at 14 seconds.
Wed..NE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 2 to 3 ft at 14 seconds.
Wed night..N winds 5 to 10 kt. Wind waves 1 ft. W swell 2 to 3 ft at 14 seconds.
Thu..NW winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 15 seconds.
Thu night..W winds 5 to 10 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 14 seconds.
Fri..W winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft. A chance of showers.
Sat..N winds 5 to 10 kt. Wind waves 1 ft. W swell 3 to 5 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 817 Am Pst Tue Jan 19 2021
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Gale force gusts over much of the coastal waters and the san francisco bay will continue into this afternoon before winds gradually diminish. Locally breezy winds will persist this afternoon and evening resulting in hazardous seas conditions for smaller vessels. Lighter winds mid-week before a wet weather system arrives at the end of the week and northwest winds increase. Moderate northwest swell will prevail through much of the period.


7 Day Forecast for Marine Location Near Cambrian Park, CA
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location: 37.22, -121.88     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 191217 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 417 AM PST Tue Jan 19 2021

SYNOPSIS. A strong and widespread offshore wind event will continue to produce damaging winds in the hills and locally in the valleys and near the coast this morning. Winds will gradually diminish this afternoon. A cooling trend is forecast from Wednesday through Friday with unsettled weather returning late in the week and into the weekend.

DISCUSSION. as of 03:13 AM PST Tuesday . Strong, damaging winds continue to impact the region this morning with numerous reports of downed trees and limbs, scattered power outages and property damage. Wind gusts of 40 to 60 mph have been reported across portions of the Bay Area with gusts of 75 to 95 mph in the Mayacamas Mountains. Reports in excess of 70 mph have also been reported in the higher peaks of the Diablo Range and Santa Cruz Mountains as well as just above Highway 1 along the Big Sur Coast. Surface pressure gradient from WMC to SFO approached 14 mb around 09Z and may tighten a bit more before sunrise. Additionally, the local WRF and HRRR maintain 925mb winds of 45 to 55 kt over portions of the region through 15Z before diminishing by midday. Thus, will extend the High Wind Warning (for higher elevations about 1,000 feet) until 10 AM PST. Breezy to locally gusty winds will then remain possible over portions of the region through the afternoon as the air mass aloft begins to stabilize. Thus, the Wind Advisory will remain in effect even though winds will gradually diminish region-wide into the afternoon.

Colder air aloft will continue to advect over the region today as the mid/upper level low currently centered over southern Nevada shifts to the southwest and then off of the southern California coast. This will allow for afternoon temperatures to be 10 to 15 deg F cooler compared to yesterday, yet still above seasonal averages due to the dry, offshore flow. The combination of unseasonably dry fuels, strong winds and low humidity will continue to produce critical fire weather conditions over the mountains of Monterey and San Benito Counties where a Red Flag Warning remains in effect through this afternoon. While dry conditions and strong winds are impacting the remainder of the Bay Area as well, that region has seen more rainfall (albeit well below climatological normal) and thus has less of a threat for rapidly spreading wildfires. For more details, see the Fire Weather Discussion below.

Temperatures will remain above seasonal averages into Wednesday as light offshore flow persists. Onshore flow returns on Thursday resulting in a slight cooling trend that will become more robust by Friday as the upper level ridge over the Pacific retrogrades to the west. Cooler, unsettled weather conditions are expected as early as Friday as a mid/upper level low drops southward along the West Coast. Isolated to scattered rain showers will be possible over the region from Friday into Saturday as this colder system lacks sufficient moisture. Subsequent systems, potentially with a better moisture tap, will bring additional chances of precipitation across the region into early next week. Stay tuned as our focus turns to a more unsettled weather pattern late in the week.

AVIATION. as of 4:17 AM PST Tuesday . For the 12Z TAFs. Strong to very strong offshore winds, lee side mountain waves are evident on satellite imagery over most of the cwa and strong low level wind shear is occurring this morning. A strengthening upper level low is moving southwestward from Nevada and will reach Point Conception later this morning. Additionally, surface pressure gradients are strong WMC-SFO is 12.6 mb, ACV-SFO is 8.7 mb, UKI-STS is 2.1 mb. Once the low passes by to our south and southwest, winds will ease from north to south over the cwa by late morning and through the afternoon and evening. Widespread downsloping air is thoroughly dried out, VFR is forecast. Though blowing dust may temporarily lower surface visibilities to MVFR through morning.

Residual gusty north to northeast lower level winds over the North Bay early tonight may result in a brief period of low level wind shear as conditions will then favor surface wind decoupling.

Vicinity of KSFO . Airport Weather Warning for winds valid through 17z today. Low level wind shear with northeast winds 50-60 knots as low as 1,500 feet agl through 17z. North to northeast winds easing later today and tonight. VFR.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Low level wind shear with northeast winds 35-45 knots through 18z-19z today. North to northeast winds easing later today and tonight. VFR.

FIRE WEATHER. as of 03:13 AM PST Tuesday . A very dry air mass continues to advect over the region this morning with humidity values in the teens across much of the Central Coast. Additionally, strong gusty winds will prevail through the morning before diminishing later this afternoon. These weather conditions combined with unseasonably dry fuels will result in critical fire weather conditions through early this afternoon. Thus, the Red Flag Warning will remain in effect through 3 PM PST for the mountains of Monterey and San Benito Counties. While heightened fire weather conditions will persist over the remainder of the region through this afternoon, early season rains and some "green up" will limit a widespread fire weather threat. Conditions improve region wide Tuesday night into Wednesday as winds diminish and onshore flow returns late in the week.

MARINE. as of 3:13 AM PST Tuesday . North to northeast gales over the bays and coastal waters are accompanying a strengthening upper level low pressure system moving southwestward from Nevada. The low will reach Point Conception later this morning and as the low continues to move southwestward winds will diminish by late morning and afternoon. The low will be located a few hundred miles west of the Baja tonight. Long period northwest swell arrives mid-week. An upper level low and surface cold front arrives Thursday night into Friday morning with a slight chance of showers Friday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Red Flag Warning . CAZ517-518 Wind Advisory . CAZ006-505-506-508>510-513-518-528>530 High Wind Warning . CAZ507-511-512-517 GLW . Mry Bay until 9 AM GLW . Pigeon Pt to Pt Pinos 0-10 nm until 9 AM GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm until 9 AM GLW . Pt Arena to Pt Reyes 0-10 nm until 2 PM GLW . Pt Reyes to Pigeon Pt 0-10 nm until 2 PM GLW . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 2 PM GLW . Pt Arena to Pigeon Pt 10-60 nm until 12 PM GLW . SF Bay until 3 PM



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

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46269 21 mi68 min 56°F 53°F5 ft
RTYC1 - 9414523 - Redwood City, CA 27 mi50 min N 20 G 25 55°F 56°F1014.5 hPa
ELXC1 - Elkhorn Slough Reserve, CA 29 mi53 min WNW 4.1 58°F 1009 hPa15°F
MLSC1 - Moss Landing, South Harbor, CA 29 mi38 min 53°F
46092 - MBM1 33 mi101 min N 16 55°F 53°F1008.7 hPa (+1.7)
46042 - MONTEREY - 27NM West of Monterey Bay, CA 41 mi28 min NNE 25 G 35 56°F 53°F1010.7 hPa34°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 41 mi42 min 53°F5 ft
MEYC1 42 mi62 min NE 17 G 21 57°F 1009.8 hPa
46114 - West Monterey Bay, CA 44 mi42 min 53°F12 ft
AAMC1 - 9414750 - Alameda, CA 44 mi50 min NNE 8.9 G 19 57°F 53°F1015.3 hPa
LNDC1 45 mi50 min NNE 13 G 20 57°F 1015.1 hPa
OBXC1 47 mi50 min 56°F 21°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi50 min NNE 16 G 20 56°F 1015.5 hPa
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 47 mi50 min N 20 G 32
PXOC1 - 9414311 - San Francisco (Pier 1), CA 48 mi50 min N 17 G 22 55°F 1014.1 hPa
PXSC1 49 mi50 min 56°F 35°F

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
San Jose / Reid / Hillv, CA9 mi51 minWNW 20 G 2310.00 miClear and Breezy54°F18°F24%1012.9 hPa
San Jose, San Jose International Airport, CA11 mi45 minNNW 9 G 1810.00 miA Few Clouds56°F16°F21%1014.1 hPa
Mountain View, Moffett Field, CA17 mi43 minNNE 27 G 3210.00 miFair and Windy55°F18°F23%1013.2 hPa
Watsonville, Watsonville Municipal Airport, CA20 mi45 minNNE 14 G 3110.00 miFair58°F15°F18%1009 hPa
Palo Alto Airport, CA22 mi51 minNNE 24 G 3010.00 miClear and Windy54°F27°F35%1014.2 hPa

Link to 5 minute data for KRHV

Wind History from RHV (wind in knots)
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1 day agoCalmCalmCalmCalmCalmW4NW5NW5NW5CalmCalmE3Calm----------------CalmNW10N8
2 days agoCalm--CalmCalmW5NW7NW8W4W4Calm--CalmCalm------------------CalmCalm

Tide / Current Tables for Gold Street Bridge, Alviso Slough, San Francisco Bay, California
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Gold Street Bridge
Click for Map
Tue -- 05:27 AM PST     8.78 feet High Tide
Tue -- 07:19 AM PST     Sunrise
Tue -- 11:15 AM PST     Moonrise
Tue -- 12:57 PM PST     2.37 feet Low Tide
Tue -- 05:11 PM PST     6.72 feet High Tide
Tue -- 05:18 PM PST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.123.75.87.68.78.78.175.74.43.32.62.434.45.96.76.665.1432.1

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
Tue -- 02:27 AM PST     1.06 knots Max Flood
Tue -- 05:44 AM PST     -0.00 knots Slack
Tue -- 07:19 AM PST     Sunrise
Tue -- 09:48 AM PST     -0.77 knots Max Ebb
Tue -- 11:16 AM PST     Moonrise
Tue -- 12:38 PM PST     0.00 knots Slack
Tue -- 02:56 PM PST     0.71 knots Max Flood
Tue -- 05:18 PM PST     Sunset
Tue -- 05:50 PM PST     -0.00 knots Slack
Tue -- 09:56 PM PST     -0.73 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.7110.80.4-0.1-0.4-0.6-0.7-0.8-0.6-0.30.20.60.70.60.4-0-0.3-0.5-0.7-0.7-0.5

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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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.