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Animation: Eddy west of the Golden Gate this morning

 
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windfind



Joined: 18 Mar 1997
Posts: 1687

PostPosted: Sat Aug 08, 2020 11:49 am    Post subject: Animation: Eddy west of the Golden Gate this morning Reply with quote

Hi Gang,

This is just a quick visual on the just forming small eddy west of the Golden Gate this morning and what it looked like yesterday afternoon. This eddy pattern will greatly enlarge during the next 12 hours and bring southerly winds to much of the Central California coast.

This critter will control our wind pattern for several days.

Here is our forecast: https://blog.weatherflow.com/west-coast-wind-blog-san-francisco-reenters-an-eddy-pattern-august-8/

Mike Godsey
iwindsurf.com/ikitesurf.com
Weatheflow.com



EddyToday&Yesterday..2020-08-08 09_42_30.gif
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johnarmitage



Joined: 10 Jun 2001
Posts: 103

PostPosted: Sat Aug 08, 2020 1:46 pm    Post subject: Reply with quote

Thanks for this Mike.

It seems that Eddy always appears adjacent to the bay. Is this only perception, or do eddies appear all up and down the coast based on conditions? If He appears only or mostly off the Bay Area, why?
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loopy



Joined: 21 May 2004
Posts: 66

PostPosted: Sun Aug 09, 2020 11:47 am    Post subject: eddy Reply with quote

eddy shows his true face


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windfind



Joined: 18 Mar 1997
Posts: 1687

PostPosted: Mon Aug 10, 2020 3:46 pm    Post subject: Reply with quote

johnarmitage wrote:
Thanks for this Mike.

It seems that Eddy always appears adjacent to the bay. Is this only perception, or do eddies appear all up and down the coast based on conditions? If He appears only or mostly off the Bay Area, why?


Hi John,

For most of the recorded California history, there has been a Monterey Eddy between Santa Cruz and Monterey. And Southern California has its well known Catalina Eddy. However, an eddy off San Francisco is not mentioned in the literature. To the best of my knowledge, I was the first to write about this eddy. Although commercial party fishing boat skippers have been aware of rare summertime southerly winds for decades.

What is clear is that this once rare eddy is rapidly becoming more common each passing year.

If the factors that make the eddy weak the eddy forms in the Stinson Beach to Golden Gate area and the eddy quickly dies midday.

If the factors are stronger the eddy can span the waters from Mendocio to Pt. Conception and last for days. But it is still centered west if the Bay Area.

Why the Bay Area? It forms here because the factors that create the eddy all come together near the Bay.

The upper level summer winds at steer and shape the surface North Pacific High are making greater N. and S. excursions in recent decades and La Nina and El Nino patterns are becoming more common. Together all of this more frequently causes part of the North Pacific High to move inland into far Northern California and into the Pacific Northwest. This extension of the NPH is caused a ridge.

As you can see in the following animation the "kink" in the North Pacific High's isobars is most commonly just north of the Bay Area. And this creates NNW ocean winds west of the Bay Area. Notice how this kink also causes low pressure to move into the area just north of the Bay Area.

Together this causes an eddy to form near the Bay Area making for southerly coast winds. These winds flow through gaps in the coast range that are open to the SW.

This is a far more complex process than I can cover here but the bottom line is that at this point in climate change the Bay Area is going to experience more common eddies.

Mike Godsey
iwindsurf.com/ikitesurf.com
Weatheflow.com



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