Weather Alert in Alaska
Winter Weather Advisory issued February 19 at 10:59AM AKST until February 20 at 6:00AM AKST by NWS Juneau AK
AREAS AFFECTED: Petersburg Borough; Western Kupreanof and Kuiu Island; City and Borough of Wrangell
DESCRIPTION: ...ACCUMULATING SNOW ACROSS THE PANHANDLE TO END THE WEEK... .A front moving across the gulf has begun to impact the panhandle with snow showers spreading along the outer coast and reaching southward to Petersburg and Wrangell as of 1045 am Thursday. The highest snow accumulations are still expected along the outer coast with orographic enhancement. A secondary batch of heavier showers will develop along the northern panhandle and progress southward as a deformation band associated with the surface low Thursday night into Friday. For inland areas, snow is expected to be light and fluffy in nature due to cold temperatures both aloft and down to the surface. Coastal communities will likely see wetter snow due to slightly warming surface temperatures through the day. * WHAT...Snow expected. Total snow accumulations of 3 to 6 inches. * WHERE...Petersburg Borough, Western Kupreanof Island and Kuiu Island and City and Borough of Wrangell. * WHEN...Until 6 AM AKST Friday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Light snow showers have begun to impact the area. These showers will pick up in intensity through the day Thursday as the frontal band continues pushing inland. A secondary batch of heavier showers remains possible as the surface low drops southward in the gulf Friday.
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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