Weather Alert in Alaska
Special Weather Statement issued March 19 at 2:09PM AKDT by NWS Juneau AK
AREAS AFFECTED: City and Borough of Sitka; Petersburg Borough; Western Kupreanof and Kuiu Island; Prince of Wales Island; City and Borough of Wrangell; Ketchikan Gateway Borough; Annette Island
DESCRIPTION: Snow showers will continue to impact the region through the end of the week, with snow accumulations being limited during the daytime hours. Confidence is increasing on seeing a more significant round of snow this weekend, as cold temperatures aloft remain in place and we see more moisture move in. There remains a lot of uncertainty for snow accumulations at the surface as we are starting to see warmer day time temperatures into the mid to high 30s to around 40 due to increasing daylight and sun angle. Temperatures aloft are still more favorable for accumulating snow amounts. If the precipitation rates are significant enough to overcome the warmer surface temperatures, snow accumulations will be greater. But if the temperatures are able to overcome the precipitation rates, snowfall will be limited as it melts by the time it reaches the surface. This will need to be monitored for any changes in potential snow accumulation. The orientation of the low and where the showers move into the panhandle will also impact the snow amounts, with how northward and inland the heavier moisture will push and how organized the band of showers is expected to be when moving through this weekend. Stay tuned for the latest forecast updates at weather.gov/juneau.
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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