Saturday, November28, 2020
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Marine Weather and Tides
Twin Lakes, 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 6:59AMSunset 4:53PM Saturday November 28, 2020 8:56 AM PST (16:56 UTC) Moonrise 4:07PMMoonset 5:19AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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- 835 Am Pst Sat Nov 28 2020
Rest of today..NE winds up to 10 kt, becoming W this afternoon. Wind waves 1 ft. W swell 3 to 5 ft at 12 seconds.
Tonight..E winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 13 seconds.
Sun..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 4 to 6 ft at 13 seconds.
Sun night..SE winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft at 13 seconds.
Mon..W winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft at 18 seconds.
Mon night..E winds up to 10 kt. Wind waves 1 ft. W swell 6 to 7 ft at 18 seconds.
Tue..N winds around 5 kt. Wind waves 1 ft. W swell 5 to 7 ft.
Wed..NE winds around 5 kt. Wind waves 1 ft. W swell 4 to 6 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 835 Am Pst Sat Nov 28 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Surface high pressure west of the waters and across the great basin will continue to result in light winds over the region through Monday. Locally stronger northwest winds will be possible early in the week along the coast, especially south of pigeon point. The next long-period northwest swell arrives Monday into Tuesday with another swell train late in the week.


7 Day Forecast for Marine Location Near Twin Lakes, CA
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location: 36.83, -122.01     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 281201 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 401 AM PST Sat Nov 28 2020

SYNOPSIS. High pressure over California will result in sunny, mild days and clear, cool nights through this weekend. Slight cooling is expected on Monday, followed by a gradual warming trend through the remainder of next week. Dry weather is expected to continue through next week.

DISCUSSION. As of 3:05 AM PST Saturday . Water vapor imagery this morning shows an elongated plume of moisture stretching from the center of a low pressure system at 145W to the PAC NW. While some of this moisture has made it into portions of far northwestern California, the vast majority of the State is under a very dry air mass regime. Winds are also much lighter this morning when compared to what was observed yesterday morning, especially over some of our historically windiest locations (e.g. Mt. St. Helena and Mt. Diablo). The culmination of clear skies and calm/light winds regionwide has resulted in some North Bay locations like Santa Rosa and Napa running 10-15 degrees F cooler than this time yesterday morning.

Short and Medium-term guidance both paint a rinse-and-repeat pattern for tomorrow and Sunday, with cold temps by daybreak in much of the region and some of our coldest locations in the interior North Bay valleys followed by rapid daytime warming and much milder temps in the 60s F for today and tomorrow. Given the perseverance of this upper-level ridge, can expect slightly warmer daytime highs in the upper-60s F by Sunday, especially in the interior. Nonetheless, dry and clear sky conditions will result in rapid overnight radiational cooling over the next couple of days. Winds will also remain rather light regionwide. Offshore flow will be near null as the SFO-WMC gradient will continue to decrease over the next couple of days. The only major variance for the next couple of days is the passage of a weak shortwave trough over the PAC NW through Monday. Can expect slightly cooler temps Monday as its axis moves ashore and an increase in the possibility for some isolated locations to wake up to some morning frost. Will depend largely on how much moisture manages to move into our CWA over the next couple of days, as GFS does bring the current moisture plume over the PAC NW slightly closer to NorCal and the Bay Area through Monday morning. It should be noted, however, that the upper-level ridge overhead and the fragility of the plume makes it unlikely that much, if any, moisture makes it that far into Northern California this weekend. Moreover, even if some moisture does make it into portions of the North Bay, will at most see patchy frost. Not expecting any sort of precip out of this.

The latest GFS and ECMWF runs paint a disheartening picture for next week. Following the dissipation of the PAC NW moisture plume, a much more amplified pattern will develop between the Northeastern and Northcentral Pacific. Essentially, the current upper-level ridge over California looks set to expand farther north, with 580dm 500hPa building up to the Washington/British Columbia Border. This will be in sharp contrast to the 500-520dm 500hPa heights that are progged to continue over much of the open waters of the North Pacific Ocean. The repercussions of this synoptic-scale setup will be two-fold. First, the upper-level ridge will help to maintain the widespread subsidence over our area, so will see a gradual warming trend, along with sharp variations between daytime max and nighttime min temps. Second, storm systems that develop over the North Pacific will now be diverted even farther north than what has been observed in recent weeks, impacting portions of Central and far Northern British Columbia and leaving much of the West Coast bone dry. There is some potential that we may still receive moisture from the tail-end of some of these storm systems, with the ECMWF ENS members taking a more aggressive approach to the intensity of these storm systems. That being said, the odds are not in our favor for moisture next week, as the most likely scenario is that these systems will not be able to overcome the strength of the upper-level ridge and thus high- confidence that dry conditions will prevail next week.

As mentioned in the previous AFD, the latest CPC 8-14 day outlook calls for dry conditions through at least the first half of December.

AVIATION. As of 4:00 AM PST Saturday . Surface high pressure off the California coast and over the Great Basin resulting in very light winds. Satellite image shows low clouds over the ocean, but these will remain offshore as the winds are very light. VFR conditions with light winds through Sunday.

Vicinity of KSFO . VFR. Light winds becoming onshore to 10 kt late afternoon through early evening.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR with southeast drainage wind 5-10 kt in the morning. Winds becoming onshore 5-10 kt in the afternoon before weakening and returning to the SE Saturday evening.

MARINE. as of 03:47 AM PST Saturday . High pressure covers the coastal waters and the Great Basin. This will keep light northwest winds through Wednesday except for locally gusty winds along the coast south of Pigeon Point. The next long-period northwest swell arrives next Monday into Tuesday with another swell train late in the week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: Diaz AVIATION: W Pi MARINE: W Pi

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46092 - MBM1 6 mi59 min NE 9.7 50°F 53°F1023.8 hPa
ELXC1 - Elkhorn Slough Reserve, CA 14 mi72 min SSW 1.9 39°F 32°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 15 mi61 min 53°F2 ft
MEYC1 17 mi81 min Calm G 1 44°F 1024 hPa
46114 - West Monterey Bay, CA 20 mi61 min 54°F5 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 21 mi37 min NW 5.8 G 7.8 48°F 53°F1024.8 hPa47°F
46239 - Point Sur, CA (157) 34 mi61 min 53°F5 ft
RTYC1 - 9414523 - Redwood City, CA 48 mi57 min WSW 1 G 1.9 43°F 56°F1026.3 hPa (+1.1)

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Watsonville, Watsonville Municipal Airport, CA14 mi64 minN 010.00 miFair41°F28°F62%1025 hPa
Monterey Regional Airport, CA19 mi63 minN 010.00 miFair41°F25°F53%1025.4 hPa
Salinas, Salinas Municipal Airport, CA24 mi64 minSE 1110.00 miFair43°F24°F47%1025.4 hPa

Link to 5 minute data for KWVI

Wind History from WVI (wind in knots)
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Last 24hr3SE4CalmCalmSE4SE4W3W5NW3NW3CalmCalmN3N5CalmCalmCalmCalmNW4CalmCalmNW3CalmCalm
1 day agoS4SW7S6NE8SW73W5W4CalmCalmN3N4NW4N4W5N5N4CalmNW3W3CalmNW4CalmCalm
2 days agoCalmCalmS3SE3SW10SW5SW4CalmCalmN54SW3W3N4CalmNW43NW3CalmN4CalmCalmN3Calm

Tide / Current Tables for Santa Cruz, Monterey Bay, California
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Santa Cruz
Click for Map
Sat -- 02:30 AM PST     2.21 feet Low Tide
Sat -- 05:19 AM PST     Moonset
Sat -- 07:00 AM PST     Sunrise
Sat -- 08:29 AM PST     5.34 feet High Tide
Sat -- 03:31 PM PST     -0.07 feet Low Tide
Sat -- 04:06 PM PST     Moonrise
Sat -- 04:51 PM PST     Sunset
Sat -- 10:10 PM PST     3.89 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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32.52.32.32.73.34.14.85.35.34.83.82.61.40.5-0-00.41.22.12.93.63.93.8

Tide / Current Tables for Point Pinos, California Current
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Point Pinos
Click for Map
Sat -- 01:29 AM PST     -0.46 knots Max Ebb
Sat -- 04:53 AM PST     0.00 knots Slack
Sat -- 05:18 AM PST     Moonset
Sat -- 06:59 AM PST     Sunrise
Sat -- 07:42 AM PST     0.51 knots Max Flood
Sat -- 10:32 AM PST     -0.00 knots Slack
Sat -- 01:41 PM PST     -0.84 knots Max Ebb
Sat -- 04:06 PM PST     Moonrise
Sat -- 04:52 PM PST     Sunset
Sat -- 05:41 PM PST     0.00 knots Slack
Sat -- 08:42 PM PST     0.65 knots Max Flood
Sat -- 11:54 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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-0.3-0.4-0.4-0.4-0.200.30.50.50.40.2-0.2-0.5-0.8-0.8-0.7-0.5-0.20.10.40.60.60.50.3

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
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.