Saturday, January18, 2020
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Marine Weather and Tides
Point Arena, CA

Version 3.4
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 7:21AMSunset 5:18PM Friday January 17, 2020 10:42 PM PST (06:42 UTC) Moonrise 12:32AMMoonset 12:18PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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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Area Forecast Discussion National Weather Service San Francisco Bay Area 1012 PM PST Fri Jan 17 2020

SYNOPSIS. High pressure building over the West Coast will result in dry and mild weather conditions through the weekend. Rain chances return late Monday into Tuesday. Mostly dry conditions are then expected for the remainder of next week.

DISCUSSION. As of 8:50 PM PST Friday . The primary forecast concern in the short term is fog. A weather spotter reported dense fog northeast of Concord earlier this evening, but latest observations across the region indicate only patchy light fog. Expect fog to become more widespread overnight, especially in the North and East Bay Valleys, although considerable high clouds may help limit fog formation to some extent. Patchy dense fog is certainly possible late tonight and through about mid morning on Saturday.

Besides fog, there are no other weather concerns through the weekend. An upper ridge over California will divert Pacific storm systems well to our north. Expect a warming trend through the weekend, with 60s becoming more common by Sunday, especially across southern portions of our area.

The upper ridge is forecast to shift to our east by Monday, allowing a system to spread precipitation across northern California from late Monday through Tuesday. This looks to be a system of moderate intensity that will be focused primarily across areas north of I-80, although there's a good chance of rain as far south as Monterey County by Tuesday afternoon. One thing to keep an eye on is a weak disturbance, located to the south of the primary system, that is expected to tap into subtropical moisture. The 00Z GFS shows this weak disturbance dissipating well offshore. The 12Z ECMWF, on the other hand, forecasts it to hold together long enough to produce some light precipitation across the southern third of our forecast area late on Monday, before the primary system to the north even arrives.

Upper level ridging is forecast to redevelop by the middle of next week, and generally dry conditions are expected for the remainder of the week. However, a weak system may brush the northern portion of our area around Thursday or Thursday night.

These weather systems over the next seven days will be approaching from the west and will therefore be relatively warm compared to recent systems. This will mean snow levels will remain mostly above 5000 feet during precipitation events.

AVIATION. as of 10:09 PM PST Friday . High pressure building over the district and over the Great Basin will result in offshore winds tonight. Will have to watch for fog advecting from the Central Valley possibly impacting SFO and the approach as dew points have increased in the Bay Area right when the offshore winds developed.

Vicinity of KSFO . VFR. Northeast winds have been stronger than expected this evening at 10-13 kt which has been concentrated over SFO and the approach zone down to SMB. Hi-res models show these winds decreasing after 09Z. Will have to watch for the possibility of fog advecting from the Central Valley early in the morning. Mentioned vsbys down to 3-5 miles at times between 13Z and 16Z.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR. Southeast winds as high as 10 kt in the Salinas Valley overnight. Light winds elsewhere.

MARINE. as of 09:41 PM PST Friday . High pressure is building rapidly over the Great Basin. This will bring offshore winds to the coastal waters and in the bays through Sunday. Winds will turn southerly and increase by Monday morning ahead of an approaching frontal system. A moderate northwest swell will arrive late Saturday and Sunday while a larger northwest swell arrives the middle of next week.



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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 (1,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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