Weather Alert in Alaska
Winter Storm Warning issued February 28 at 1:51PM AKST until March 2 at 9:00AM AKST by NWS Juneau AK
AREAS AFFECTED: Petersburg Borough
DESCRIPTION: ...CENTRAL AND SOUTHERN PANHANDLE SNOW SATURDAY WITH POTENTIAL FOR MORE SNOW SUNDAY... Steady snowfall continues across a majority of the panhandle and will continue to pick up as the low moves into the eastern gulf through Saturday afternoon. Later in the afternoon and evening, south to southwest wind are expected to cause temperatures to warm over the southern outer coast with precipitation becoming a mix or changing to all rain. Around the same time, snow will end on the NW side of the low, from Sitka to Juneau and northward. Moisture will decrease overnight Saturday across the south, but then redevelop on Sunday as another system moves in. The rain/snow line will likely hover in vicinity of Sumner Strait Sunday into Monday with additional heavy snow expected for the Petersburg and Wrangell areas and lighter snow northward. A separate low pressure system looks to affect the region on Tuesday with potential for snow to push northward once again. * WHAT...For the first Winter Storm Warning, heavy snow. Additional snow accumulations of 5 to 7 inches. For the second Winter Storm Warning, heavy snow expected. Total snow accumulations of 10 to 13 inches. * WHERE...Petersburg Borough. * WHEN...For the first Winter Storm Warning, until 11 PM AKST this evening. For the second Winter Storm Warning, from 9 AM Sunday to 9 AM AKST Monday. * IMPACTS...Travel will be difficult. * ADDITIONAL DETAILS...Snowfall rates are expected to drop off overnight Saturday into Sunday morning. Another surge of moisture will bring heavier snowfall rates by Sunday afternoon and last into Monday morning.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water with you in case of an emergency. 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 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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