Friday, December6, 2019
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Marine Weather and Tides
Point Arena, CA

Version 3.4
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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 7:09AMSunset 4:52PM Friday December 6, 2019 9:37 AM PST (17:37 UTC) Moonrise 2:20PMMoonset 1:53AM Illumination 73% 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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7 Day Forecast for Marine Location Near Point Arena, CA
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location: 36.95, -126.32     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 061652 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 852 AM PST Fri Dec 6 2019

SYNOPSIS. Southerly winds will continue to increase today ahead of an incoming cold front. Rain will develop across the North Bay this afternoon and then spread southward tonight. Showery and cool on Saturday with isolated thunderstorms possible. Lingering showers on Sunday but trending drier by afternoon. Dry weather returns Monday and Tuesday with a slight chance of rain by midweek.

DISCUSSION. as of 8:52 AM PST Friday . Satellite imagery shows the approaching storm system approximately 640 miles due west of Cape Mendocino, with the associated frontal band nearing the North Coast. Latest computer models continue the trend of slowing down the arrival of this system. The 12Z Nam has the frontal band moving into Sonoma County just after 00Z (4 PM PST) and holds off rain in San Francisco until after 7 PM. The bulk of the rainfall with this first wave is forecast to fall in the North Bay, and to a lesser extent, the Santa Cruz Mountains. A second front will sweep through the entire district on Saturday and will bring more rainfall to the area through Saturday evening, along with a slight chance of thunderstorms with small hail possible. The upper low will then finally move south along the coast on Sunday keeping showers going in its vicinity as it exits the area Sunday night. Latest storm-total rainfall estimates still show some 3-4 inch maxes for the North Bay hills with 1.5-3 inches for the Santa Cruz/Santa Lucia mtns. Rain shadowed Santa Clara/Salinas Valleys 0.25-0.50 on average with 0.50-1.00 inch elsewhere through Sunday night.

The Flash Flood watch for the Kincade burn area still looks valid with all models showing a bullseye of qpf in that area and the front strongest as it moves through northern Sonoma county this evening. Will need to monitor any convective lines and short term rain rates that could lead to problems over the burn area.

A Wind Advisory remains in effect for all areas beginning later this morning and continuing into Saturday morning. Strongest winds are expected along the coast and in the higher terrain. Gusty southeast winds will persist well into Saturday as the second front moves through.

Dry weather returns Monday and Tuesday with seasonable temperatures as high pressure rebuilds. A weak front may try and knock into the ridge by Weds with a slight chance of rain but not expecting anything of significance at this time.

AVIATION. as of 04:05 AM PST Friday . For 12z TAFs. Low level clouds have decreased slightly as the next storm system approaches with most terminals now reporting VFR conditions. As the front approaches later today expect low level clouds to increase once again with borderline MVFR/VFR conditions. Scattered light rain showers will be possible much of the day across the North Bay ahead of the front. The main front and band of rainfall looks to arrive from north to south from 00-06z this evening. Mainly light rain is expected but periods of moderate rain are possible, heaviest in the North Bay. Southeast winds will increase today ahead of the front and become gusty this afternoon and evening. Possible LLWS today as well as southeast winds will approach 45-50 kt at 2000 feet AGL this evening.

Vicinity of KSFO . SCT/BKN clouds with bases around 3000-4000 feet this morning will gradually lower to around 2500 feet late this afternoon as a cold front approaches. Southeast winds will increase this morning and become stronger through the afternoon. Winds by 15z will gust to around 15 kt and increase to 25-30 kt this afternoon. Gusts up to 35 kt are possible this evening. Expecting the front and rain to arrive 00-03z with light to possible periods of moderate rain. LLWS will be a concern through the day as winds aloft increase more than the surface winds.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . Cigs remaining in the VFR range this morning. Clouds with bases 3000-5000 feet will gradually increase today ahead of a cold front. The front will bring rain showers to the terminals this evening and overnight. Southeast winds will increase through the day, strongest at KSNS where gusts to near 30 kt are likely this afternoon and 30-35 kt this evening.

MARINE. as of 8:47 AM PST Friday . A storm system will move through the waters from north to south over the next 24 hours, bringing unsettled weather today into the weekend. As a result, southerly gale force gusts will develop across the waters today. These winds will generate large wind waves and hazardous seas. Moderate west swell will gradually build to around 10 to 12 feet tonight and continue through Saturday night. Showers and isolated thunderstorms will be possible this evening through Saturday.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. Wind Advisory . CAZ006-505>513-516>518-528>530 Flash Flood Watch . CAZ506-507 SCA . SF Bay until 3 PM SCA . Pt Reyes to Pigeon Pt 0-10 nm until 3 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 3 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 3 PM GLW . SF Bay from 3 PM GLW . Pt Reyes to Pigeon Pt 0-10 nm from 3 PM GLW . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM GLW . Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 PM GLW . Pigeon Pt to Pt Piedras Blancas 10-60 nm from 3 PM GLW . Pt Arena to Pt Reyes 0-10 nm GLW . Pt Arena to Pigeon Pt 10-60 nm SCA . Mry Bay from 3 PM



PUBLIC FORECAST: Sims AVIATION: ST MARINE: DRP

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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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Wind Forecast for San Francisco/Monterey Bay Area, CA (12,3,4,5)
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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.