Weather Alert in Alaska
Winter Weather Advisory issued March 3 at 7:41AM AKST until March 3 at 3:00PM AKST by NWS Juneau AK
AREAS AFFECTED: Petersburg Borough; Western Kupreanof and Kuiu Island
DESCRIPTION: ...SNOW FOR THE NORTHERN AND CENTRAL PANHANDLE THROUGH WEDNESDAY... Another system is moving into the panhandle this morning and is bringing 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 Kake over to Petersburg, however, if the changeover is delayed, snowfall amounts could be higher. * WHAT...Snow. Additional snow accumulations of 2 to 6 inches. * WHERE...Petersburg Borough and Western Kupreanof Island and Kuiu Island. * WHEN...Until 3 PM AKST Tuesday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning 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 Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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