Weather Alert in Alaska
Winter Weather Advisory issued March 2 at 1:35PM AKST until March 3 at 3:00PM AKST by NWS Juneau AK
AREAS AFFECTED: City and Borough of Sitka; Western Kupreanof and Kuiu Island
DESCRIPTION: ...MULTIPLE ROUNDS OF SNOWFALL EXPECTED THROUGH MIDWEEK... Light snow will continue into this evening along the Icy Strait corridor south to Sumner Strait, with an additional 1 to 2 inches possible. Another system moving into the panhandle tonight will bring heavier snowfall rates across much of central and northern southeast Alaska. Snow is expected to mix with and eventually change over to rain on Tuesday from Sitka over to Kake and Petersburg, however, if the changeover is delayed, snowfall amounts could be higher. * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches. * WHERE...City and Borough of Sitka and Western Kupreanof Island and Kuiu Island. * WHEN...From 9 PM this evening to 3 PM AKST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Snowfall amounts will be highly dependent on how fast the changeover to rain occurs on Tuesday. A delay in the changeover timing could result in higher snowfall amounts.
INSTRUCTION: Slow down and use caution while traveling. People are urged to prepare their property before the onset of winter weather. For the latest road conditions, where available, call 5 1 1 or visit 511.alaska.gov.
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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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