:-)

Cheers

Joe wrote:



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

Joe wrote:
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.

EG Since I couldn't see under your fog bank in the picture. I wasn't
sure whether it was a valley or river under there.
In all seriousness, where I am, we frequently get a radiation fog from
the land (farm land) around us, which drifts/ blows over the harbor and
out to sea ... the end results can be the same.

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.

You find this frequently when approaching the Gulf Stream, up North.


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

otnmbrd wrote:



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.


Was it evening?

Cheers

DSK wrote in message ...
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.


I know, but its a good example of fog on the mississippi, best picture
I could find.




Would you be scared to navigate in this fog?

If it was on a river with current, yes.


Looks like a wide river most every river Ive been in had some
currents.

Are you talking current in excess of your boat ability to make
headway?

If not( assuming you have a good radar) why would you be scared, its
easy to steer by compass and radar, and correcting for set sould not
be to difficult.
with a good radar picture.


Joe
MSV RedCloud



Fresh Breezes- Doug King