Weather Alert in Indiana
Special Weather Statement issued August 29 at 7:52AM EDT by NWS Northern Indiana
AREAS AFFECTED: Elkhart; Marshall; Fulton; Whitley; Miami; Wabash; Huntington; Wells; Adams; Grant; Blackford; Jay; Northern Kosciusko; Southern Kosciusko; Van Wert; Allen
DESCRIPTION: Conditions have become favorable for patchy fog formation this morning. Most areas will have visibilities between one half mile to two miles in patchy fog, but some localized visibilities of one quarter of a mile or less are possible. Motorists should be prepared for varying visibilities across the area this morning due to the patchy nature of the fog. Conditions are expected to improve after 930 AM EDT this morning.
INSTRUCTION: N/A
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North America Water Vapor (Moisture)
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Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
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