Monday, December9, 2019
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Marine Weather and Tides
Sand City, CA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:06AMSunset 4:53PM Monday December 9, 2019 4:19 AM PST (12:19 UTC) Moonrise 3:29PMMoonset 4:27AM Illumination 94% Phase: Waxing Gibbous; Moon at 12 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- 211 Am Pst Mon Dec 9 2019
Today..SW winds around 5 kt, becoming W 5 to 15 kt this afternoon. Wind waves 1 ft, increasing to 2 to 3 ft this afternoon. W swell 2 to 4 ft at 14 seconds. SWell sw around 2 ft.
Tonight..NE winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 2 to 4 ft at 15 seconds and S around 2 ft at 16 seconds.
Tue..S winds up to 10 kt. Wind waves 1 ft. W swell 2 to 4 ft at 14 seconds and S around 2 ft at 16 seconds.
Tue night..SW winds around 5 kt. Wind waves 1 ft. W swell 3 to 5 ft at 15 seconds and S around 2 ft at 14 seconds.
Wed..NE winds around 5 kt. Wind waves 1 ft. W swell 5 to 7 ft at 14 seconds and S around 2 ft at 14 seconds.
Wed night..N winds around 5 kt. Wind waves 1 ft. W swell 5 to 7 ft at 14 seconds.
Thu..N winds up to 10 kt. Wind waves 1 ft. W swell 7 to 9 ft.
Fri..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 8 to 10 ft. Locally lower winds and seas across sheltered portions of the bay.
PZZ500 211 Am Pst Mon Dec 9 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... High pressure will build in from the west into today, keeping winds generally light across the waters. A weak system will then move through the region early this week bringing a chance of showers Tuesday night into Wednesday while winds turn southerly. Moderate northwest swell will persist through much of the week before a larger and longer period northwest swell arrives late this week.


7 Day Forecast for Marine Location Near Sand City, CA
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location: 36.66, -121.86     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 091138 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 338 AM PST Mon Dec 9 2019

SYNOPSIS. Dry conditions with mild temperatures are forecast through Tuesday afternoon. Patchy dense fog is likely during the night and morning hours. A weak weather system may produce light rain from late Tuesday into early Wednesday. Dry conditions are then forecast for most of the second half of the work week before rain chances increase by Friday night or Saturday.

DISCUSSION. As of 3:30 AM PST Monday . Primary short-term weather concern from this morning through Tuesday is fog. Plenty of low level moisture from recent rains, in combination with long December nights and a stable airmass, are producing conditions favorable for fog formation. Dense night and morning fog is a potential hazard through at least Tuesday. Dense fog has been reported in the North and East Bay valleys overnight, as well as along the east shore of San Francisco Bay. Dense fog has thus far been patchy and not particularly persistent, so will hold off on issuance of a Dense Fog Advisory for the time being. However, if dense fog becomes more widespread by daybreak, an advisory will be issued. Fog will be a factor during this morning's commute.

In addition to patchy dense fog, areas of low clouds linger this morning. A low December sun angle and lack of mixing will result in slow clearing of low clouds and fog today, and it's possible some areas will not clear until sometime in the afternoon.

Another round of fog is likely tonight and into Tuesday morning as a shortwave ridge over California maintains a stable airmass, and as low level moisture persists. Temperatures over the next few days will remain mild, with highs ranging mostly from the upper 50s to lower 60s, except locally cooler where fog persists. Low temperatures will be mostly in the 40s and lower 50s, except upper 30s in the cooler valleys.

Early morning satellite imagery shows a frontal system well offshore along 140W. The models agree that this system will split long before it reaches the coast, with the northern branch of the split moving northeast towards British Columbia and the southern branch tracking eastward and reaching the California coast by Tuesday night. The system is forecast to weaken rapidly as it pushes onshore on Tuesday evening, but the models generally agree that it will maintain enough moisture and lift to generate scattered light rain in our area, particularly in northern coastal areas. Rain could develop by late Tuesday afternoon along the North Bay coast, but the best chance of rain will be on Tuesday evening. A few showers may linger through late Tuesday night or even into early Wednesday. Rainfall totals from late Tuesday through early Wednesday are forecast to be under a quarter inch. The ECMWF is a bit more bullish with rain amounts, forecasting close to a half inch in northwest Sonoma County.

A broad low amplitude upper ridge is forecast to develop off the southern California coast by midweek and remain there through Friday. This ridge should maintain dry and mild conditions for most of our area during the second half of the work week. However, to the north of the ridge will exist a moist zonal flow with embedded weak upper level disturbances which may result in light rainfall at times in the North Bay. Rain chances will increase by Friday night or Saturday when the ridge to our southwest weakens and a shortwave trough tracks across northern and central California. It looks as though this system will move through quickly and generate only light rainfall amounts early in the upcoming weekend.

In the longer range, both the GFS and ECMWF ensemble mean indicate that a progressive pattern will continue into next week, bringing additional rain chances by Tuesday or Wednesday of next week.

AVIATION. as of 03:38 AM PST Monday . For 12z tafs. Fog and low cigs have spread overnight with most sites now seeing IFR-VLIFR conditions due to either low clouds or fog. IFR-VLIFR conditions are expected to persist through the morning with low clouds possibly lingering into the early afternoon. VFR conditions forecast for this afternoon before low clouds and patchy fog return this evening. Generally light winds through the period less than 10 kt.

Vicinity of KSFO . IFR-LIFR conditions due to combination of low clouds and fog through at least this morning. It is possible either or both of these could last into the afternoon. VFR conditions expected by around 20z-22z before low clouds return overnight. Generally light winds expected through the period at or under 10 kt.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Patchy IFR/LIFR conditions this morning due to fog and low clouds. Thus far KMRY has generally escaped the low clouds, but satellite imagery shows clouds moving towards the terminal. VFR conditions forecast around 18z-20z before low clouds return this evening. Light E/SE winds this morning before turning onshore by this afternoon.

MARINE. As of 2:11 AM PST Monday . High pressure will build in from the west into today, keeping winds generally light across the waters. A weak system will then move through the region early this week bringing a chance of showers Tuesday night into Wednesday while winds turn southerly. Moderate northwest swell will persist through much of the week before a larger and longer period northwest swell arrives late this week.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. None.

PUBLIC FORECAST: Dykema AVIATION: AS MARINE: AS

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46240 - Cabrillo Point, Monterey Bay, CA (158) 3 mi19 min 57°F3 ft
MEYC1 4 mi43 min 58°F1020.4 hPa
MLSC1 - Moss Landing, South Harbor, CA 10 mi25 min ESE 1.9 G 5.1 49°F 1020.6 hPa (+0.4)49°F
46092 - MBM1 11 mi72 min N 9.7 55°F 57°F1019.6 hPa (-0.0)
ELXC1 - Elkhorn Slough Reserve, CA 13 mi94 min Calm 51°F 1020 hPa51°F
46239 - Point Sur, CA (157) 25 mi19 min 58°F8 ft
46114 - West Monterey Bay, CA 26 mi19 min 57°F7 ft
46042 - MONTEREY - 27NM West of Monterey Bay, CA 30 mi29 min WNW 5.8 G 7.8 55°F 57°F7 ft1020.6 hPa52°F

Wind History for Monterey, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Monterey Regional Airport, CA5 mi25 minESE 410.00 miMostly Cloudy48°F46°F93%1021.3 hPa
Salinas, Salinas Municipal Airport, CA13 mi26 minN 04.00 miFog/Mist50°F48°F96%1021 hPa
Watsonville, Watsonville Municipal Airport, CA20 mi26 minN 40.25 miFog50°F48°F96%1020.2 hPa

Link to 5 minute data for KMRY

Wind History from MRY (wind in knots)
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Last 24hrS5SW7W8CalmSW3NW3Calm4W4NW6NW5CalmNW3CalmW4W4CalmSE3S3E5E5E3E4SE4
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Tide / Current Tables for Monterey, Monterey Harbor, California
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Monterey
Click for Map
Mon -- 01:34 AM PST     2.05 feet Low Tide
Mon -- 04:27 AM PST     Moonset
Mon -- 07:07 AM PST     Sunrise
Mon -- 07:57 AM PST     5.61 feet High Tide
Mon -- 03:07 PM PST     0.14 feet Low Tide
Mon -- 03:28 PM PST     Moonrise
Mon -- 04:51 PM PST     Sunset
Mon -- 09:29 PM PST     3.73 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.42.12.12.43.13.94.85.45.65.34.63.52.31.20.40.10.30.91.82.63.33.73.73.4

Tide / Current Tables for Point Pinos, California Current
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Point Pinos
Click for Map
Mon -- 12:41 AM PST     -0.46 knots Max Ebb
Mon -- 04:04 AM PST     0.00 knots Slack
Mon -- 04:27 AM PST     Moonset
Mon -- 06:57 AM PST     0.53 knots Max Flood
Mon -- 07:08 AM PST     Sunrise
Mon -- 09:52 AM PST     -0.00 knots Slack
Mon -- 01:00 PM PST     -0.85 knots Max Ebb
Mon -- 03:28 PM PST     Moonrise
Mon -- 04:51 PM PST     Sunset
Mon -- 05:01 PM PST     0.00 knots Slack
Mon -- 07:59 PM PST     0.64 knots Max Flood
Mon -- 11:12 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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-0.4-0.5-0.4-0.2-00.20.50.50.50.3-0-0.4-0.7-0.9-0.8-0.6-0.3-00.30.60.60.60.40.1

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 (7,2,3,4)
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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 numerious 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.