Weather Alert in Washington
Winter Weather Advisory issued March 3 at 11:50PM PST until March 5 at 10:00AM PST by NWS Seattle WA
AREAS AFFECTED: Cascades of Snohomish and Northern King Counties; Cascades of Southern King County; Cascades of Pierce and Lewis Counties
DESCRIPTION: * WHAT...Snow is expected across the Central and Southern Washington Cascades. Accumulations of 7-9 inches are possible for elevations between 3500-4500 feet, with locally higher amounts at higher elevation locations. * WHERE...Cascades of Snohomish and Northern King Counties, Cascades of Pierce and Lewis Counties, and Cascades of Southern King County. * WHEN...From 4 AM Wednesday to 10 AM PST Thursday. * IMPACTS...Travel could be difficult. * ADDITIONAL DETAILS...Snowfall will be heaviest Wednesday afternoon into Thursday night across Stevens, Snoqualmie, and White Pass.
INSTRUCTION: Slow down and use caution while traveling. Prepare for possible power outages.
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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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