Marine Weather Net

San Francisco Bay South of the Bay Bridge Marine Forecast


TONIGHT

NW
WINDS
UP TO
10 KNOTS

TUE

NW
WINDS
5 - 15
KNOTS

TUE NIGHT

NW
WINDS
UP TO
10 KNOTS

WED

W
WINDS
UP TO
10 KNOTS

The Marine Weather Forecast In Detail:
PZZ531 Forecast Issued: 828 PM PST Mon Mar 01 2021

Tonight...Nw Winds Up To 10 Kt.
Tue...Nw Winds 5 To 15 Kt.
Tue Night...Nw Winds Up To 10 Kt.
Wed...W Winds Up To 10 Kt.
Wed Night...Sw Winds Up To 10 Kt.
Thu...S Winds 5 To 15 Kt.
Fri...S Winds Up To 10 Kt. Rain Likely.
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828 PM PST Mon Mar 1 2021 .Synopsis for the Central California Coast and Bays Including the Monterey Bay...Greater Farallones...and Cordell Bank National Marine Sanctuaries... Gentle southeasterly breezes will continue across the waters this evening as a low pressure system hundreds of miles off the coast tracks southward. Light winds and dry conditions continue Tuesday, but building northwest swell will create hazardous seas conditions for smaller vessels Tuesday afternoon and evening. Breezier northwest winds return Wednesday. Moderate northwest swell prevails through the week.
Area Forecast Discussion
National Weather Service San Francisco Bay Area
931pm PST Monday Mar 1 2021

Synopsis
Dry and mild weather conditions are forecast to persist across the region through most of the work week ahead. Rain chances develop by late in the week or by the early part of next weekend.

As of 9:00pm PST Monday...Southerly winds developed today and resulted in slight cooling in the North Bay Valleys and in most locations near the ocean. Elsewhere today's temperatures were about the same as yesterday, with afternoon highs about 5-8 degrees warmer than normal.

Evening satellite imagery shows an upper trough offshore beginning to cut off from the westerlies as it digs south just outside 130W. This cutoff low is tracking closely to where the models had forecast. Based on latest model consensus, the low will continue to drift to the south through Tuesday morning and then take a left turn on Tuesday afternoon and move east along about 30N, eventually moving inland over southern California on Wednesday afternoon. This projected track will keep all precipitation well offshore through Tuesday night, and then confined to southern California on Wednesday. Thus, our area will remain dry. The only impact this system will have on our weather is the introduction of high clouds from tonight through Wednesday morning.

Other than increasing high clouds, little change is expected in our weather through midweek. Light southerly flow currently is expected to transition to light offshore flow by tomorrow, which will dry our airmass even further. Also, the airmass aloft is forecast to warm slightly over our area by tomorrow. The net result will likely be slightly warmer daytime temps tomorrow, even with the addition of high clouds. High clouds will probably be too thin yet tonight to have much impact on overnight temps, but by tomorrow night the clouds should thicken enough to hold temps up a bit.

Once the upper low finally moves inland to our south late Wednesday, onshore flow is forecast to develop across our area. This will result in cooler daytime temps from midweek onward, especially near the coast. We may also see areas of coastal low clouds and fog develop by late Wednesday and Wednesday night.

Models are coming into better agreement regarding the system currently tracking across the Aleutian Islands. This system is forecast to dig south through Thursday and then move east late in the week and potentially bring widespread precipitation to our area Friday night into Saturday. Deterministic and most ensemble members indicate only light precipitation in our area with this system, with perhaps the potential for moderate rainfall amounts in the North Bay. Beyond the weekend, it looks as though we may see an extended period of unsettled weather as the longwave trough position sets up either over the Eastern Pacific or along the West Coast. However, optimism for a wet pattern is tempered to some extent by the fact that most ensemble output indicates light precipitation amounts during this upcoming period of unsettled weather.

Marine
as of 08:28pm PST Monday...Gentle southeasterly breezes will continue across the waters this evening as a low pressure system hundreds of miles off the coast tracks southward. Light winds and dry conditions continue Tuesday, but building northwest swell will create hazardous seas conditions for smaller vessels Tuesday afternoon and evening. Breezier northwest winds return Wednesday. Moderate northwest swell prevails through the week.

.MTR WATCHES/WARNINGS/ADVISORIES... .Tngt...NONE.

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