Here is a good example of the type of fog you see on Mark Twains favorite
river:

http://away.com/gifs/states/mn/fall_missriver.jpg

Anyone know what type of fog this is? And how it is formed?

Notice how calm it is? makes it thick as can be
Notice how flat the water is? great for a crystal clear radar picture
Notice how low it is? Lots of sunlight makes it very bright-snowblinds ya
Notice the steep banks? Makes a easy-to-learn radar picture.


How many other types of fog exist?

Would you be scared to navigate in this fog?

Joe
MSV RedCloud

"Joe" wrote in message
om...
Here is a good example of the type of fog you see on Mark Twains favorite
river:

http://away.com/gifs/states/mn/fall_missriver.jpg

Anyone know what type of fog this is? And how it is formed?

Notice how calm it is? makes it thick as can be
Notice how flat the water is? great for a crystal clear radar picture
Notice how low it is? Lots of sunlight makes it very bright-snowblinds ya
Notice the steep banks? Makes a easy-to-learn radar picture.


How many other types of fog exist?

Would you be scared to navigate in this fog?

Depends.....

Do *you* motor about on that river?


Regards


Donal
--

"Donal"

Would you be scared to navigate in this fog?

Depends.....

Do *you* motor about on that river?

Sure do here is a picture for you:

http://www.maritimepersonnel.net/images/crewboat.jpg

Better watch out! Better stay at home were your sure to be somewhat
safe.

Joe
MSV RedCloud



Regards


Donal
--

Joe wrote:

Here is a good example of the type of fog you see on Mark Twains favorite
river:

http://away.com/gifs/states/mn/fall_missriver.jpg

Anyone know what type of fog this is? And how it is formed?

It looks like a blanket of fog in chilly air over warm water, I forget the
official name for it. And if it is in St Paul Minn, it's well above Mark
Twain country IIRC.



Would you be scared to navigate in this fog?

If it was on a river with current, yes.

Fresh Breezes- Doug King

DSK wrote:


It looks like a blanket of fog in chilly air over warm water,

Correct!

I forget the
official name for it.

Let me help you. Think 'sea' might be an ad*ective for fog?

Cheers

MC wrote:


Let me help you. Think 'sea' might be an ad*ective for fog?

Very good. Thanks.

Now, what use is this again?

DSK

There are four types of fog and you could guess for a long time about =
that picture. I'm assuming it's evaporative since it looks like an =
autumn picture with probable cold air passing over a warmer body of =
water creating the mass....the upper layer of cold air would prohibit =
the fog from rising. =20

--=20
katysails
s/v Chanteuse
Kirie Elite 32
http://katysails.tripod.com

"Women and cats will do as they please, and men and dogs should relax
and get used to the idea." - Robert A. Heinlein

katysails wrote:

There are four types of fog and you could guess for a long time about that picture. I'm assuming it's evaporative since it looks like an autumn picture with probable cold air passing over a warmer body of water creating the mass....the upper layer of cold air would prohibit the fog from rising.

That's not what MC said...

Ain't it funny how you and I (and probably a quite a few others around here) could deduce the conditions but only Navvie knows it's proper taxonomy (or is it orthography).

DSK

MC wrote:


DSK wrote:


It looks like a blanket of fog in chilly air over warm water,


Correct!

I forget the

official name for it.


Let me help you. Think 'sea' might be an ad*ective for fog?

Cheers



See, now I'd have guessed radiation fog, not advection.

otnmbrd wrote in message link.net...
MC wrote:


DSK wrote:


It looks like a blanket of fog in chilly air over warm water,


Correct!

I forget the

official name for it.


Let me help you. Think 'sea' might be an ad*ective for fog?

Cheers



See, now I'd have guessed radiation fog, not advection.

Radiation Fog - occurs under clear, calm skies when infrared radiation
(heat) escapes to upper atmosphere and outer space and the air is
cooled to its dewpoint. Sometimes called valley fog or ground fog and
is the most common fog over land in the world.

Advection Fog - occurs when warm, humid air is cooled to its dewpoint
by coming into contact with a cooler surface below. Snow, ice, and
cold water are common surfaces that cause advection fog.

MC is correct. The Mississippi is cold, and lots of warm air from the
south flows into the delta.

Steam Fog - occurs when cooler air rests above warmer water and vapor
that evaporates into the air cools to its dewpoint. Sometimes called
Arctic sea smoke.

You see this on your local lakes many times, just not to the scale
seen in the artics. And when it starts it weird looking like snakes
growing out of the sea.


Upslope Fog - occurs when air is forced to rise up a large slope and
cools (adiabatically) to its dewpoint. Common in mountainous states.

Frontal Fog - also knows as precipitation fog and occurs when rain
drops fall into unsaturated, cooler air below. As the drops evaporate,
water vapor is introduced into the cooler air. Very quickly, the vapor
condenses into a small fog droplet.

Sorry Katy 5 not 4 types.

Joe
MSV RedCloud