Weather Alert in Montana
Special Weather Statement issued August 29 at 6:56AM MDT by NWS Great Falls MT
AREAS AFFECTED: Gallatin Valley; Gallatin and Madison County Mountains and Centennial Mountains
DESCRIPTION: Patchy dense fog is affecting a portion of Southwestern Montana this morning including Belgrade and Raynolds Pass. Visibility in these areas has been reduced to a quarter mile or less. Patchy dense fog in these areas is expected to persist for the next couple of hours with periodic visibility improvements before the fog clears up. If you are traveling in these areas use caution, slow down, and make sure your headlights are on.
INSTRUCTION: N/A
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North America Water Vapor (Moisture)
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Weather Topic: What is Evaporation?
Home - Education - Precipitation - Evaporation
Next Topic: Fog
Evaporation is the process which returns water from the earth
back to the atmosphere, and is another crucial process in the water cycle.
Evaporation is the transformation of liquid into gas, and it happens because
molecules are excited by the application of energy and turn into vapor.
In order for water to evaporate it has to be on the surface of a body of water.
Next Topic: Fog
Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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