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Why Does Sunrise Cause Fog to Form?

 
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fxop



Joined: 13 Jun 1998
Posts: 166

PostPosted: Tue Sep 24, 2019 11:38 am    Post subject: Why Does Sunrise Cause Fog to Form? Reply with quote

The other day I got up at 6am and the sky was perfectly clear. As sunrise approached a haze formed overhead. The sun came up at about 7 and the haze overhead thickened and then gradually burned off.

Many years ago I lived high on a hill overlooking the South Bay. On mornings when the sun rose over a thick surface fog, you could see in the space of a few minutes the fog exploding upward.

My question for you weather nerds is, the sun adds heat -- why is *more* fog forming when the sun rises and adds heat to the atmosphere?

fxop
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dllee



Joined: 03 Jul 2009
Posts: 4591
Location: East Bay

PostPosted: Tue Sep 24, 2019 12:16 pm    Post subject: Reply with quote

Is the fog forming or is the heat warming and causing rising air to be displaced by low lying fog?
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fxop



Joined: 13 Jun 1998
Posts: 166

PostPosted: Tue Sep 24, 2019 2:19 pm    Post subject: Reply with quote

Driving up the freeway I didn't see any adjacent fog and I was 5 miles from the Bay.

It was a cool morning. This must be some kind of radiation fog plus inversion layer thing but I can't make it out.

The other thing I've been seeing is totally clear sky down to the horizon 30 mins before sunrise on the East Bay hills, then as the sun comes up you see fog forming on the ridgetops.

Been watching these various fog things for 50 years and realized I don't really understand all of them.

fxop
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airwave



Joined: 29 Jun 2000
Posts: 377

PostPosted: Tue Sep 24, 2019 3:03 pm    Post subject: Reply with quote

Without sunshine there would be no fog.
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outcast



Joined: 04 May 2004
Posts: 2709

PostPosted: Tue Sep 24, 2019 6:50 pm    Post subject: Reply with quote

Without rain....no rainbows
_________________
https://www.youtube.com/watch?time_continue=2&v=zw0MgkO7VXw
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isobars



Joined: 12 Dec 1999
Posts: 19253

PostPosted: Tue Sep 24, 2019 7:40 pm    Post subject: Reply with quote

airwave wrote:
Without sunshine there would be no fog.

I assume you're joking or philosophizing.
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airwave



Joined: 29 Jun 2000
Posts: 377

PostPosted: Wed Sep 25, 2019 2:44 pm    Post subject: Reply with quote

isobars wrote:
airwave wrote:
Without sunshine there would be no fog.

I assume you're joking or philosophizing.


It's complicated.
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gerritt



Joined: 06 May 1998
Posts: 589
Location: Redwood City, CA

PostPosted: Wed Sep 25, 2019 6:03 pm    Post subject: Reply with quote

Google is your friend: https://www.thoughtco.com/overview-of-fog-1435830
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tstizzle



Joined: 05 Jul 2000
Posts: 237

PostPosted: Thu Sep 26, 2019 9:59 am    Post subject: Reply with quote

outcast wrote:
Without rain....no rainbows


50% of the time, it happens all the time.
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