Weather Alert in Alaska
Special Weather Statement issued August 1 at 11:09AM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Upper Tanana Valley; Eastern Alaska Range North of Trims Camp; Eastern Alaska Range South of Trims Camp
DESCRIPTION: A system bringing abundant rainfall will move quickly from east to west across the Upper Tanana Valley and Alaska Range Friday evening into Saturday. Rainfall rates of 1" per hour are possible from 7pm Friday evening through around 10am Saturday morning. Rainfall will begin along the Alaska Highway near the Alcan Border and move west to Dry Creek and over the eastern Alaska Range overnight. Short run creeks along the Alaska Highway from Dot lake to Tok may run high and fast, as well as streams draining the Macomb Plateau. Outdoor recreationists should be aware of the threat for heavy rain, high water, and debris flowing down typically dry streambeds.
INSTRUCTION: N/A
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Weather Topic: What are Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
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
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