Weather Alert in Alaska
Flood Warning issued August 31 at 11:41AM AKDT until September 1 at 12:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Upper Koyukuk Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...Koyukuk River near Allakaket. * WHEN...Until noon AKDT Monday. * IMPACTS...Flooding of rivers, creeks, streams, and other low-lying and flood-prone locations is occurring. * ADDITIONAL DETAILS... - Since Wednesday the Koyukuk River has been inundating roads in downtown Allakaket - River levels appear to have stabilized, but inundation of low lying roads is expected to continue. The streamgage on the Koyukuk River below the John River has shown over a foot of water level drop in the last 12 hours. The Middle and South Forks of the Koyukuk are also showing decreasing water levels. Water levels at Allakaket should start showing a slow recession late this evening. This is encouraging as over and inch of rain is forecast for the south slopes of the Brooks Range through Tuesday. For context, the highest water levels from this event are about 7 ft lower in Allakaket than the 1994 flood. - Low lying roads are currently flooded and airport access may be cut off. - http://www.weather.gov/aprfc
INSTRUCTION: N/A
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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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