Weather Alert in Pennsylvania
Winter Weather Advisory issued February 5 at 12:41PM EST until February 7 at 7:00AM EST by NWS State College PA
AREAS AFFECTED: Cambria; Somerset
DESCRIPTION: * WHAT...Snow expected. Total snow accumulations between 2 and 4 inches. Localized amounts up to 8 inches in the highest elevations. Winds gusting as high as 45 to 50 mph. * WHERE...Cambria and Somerset Counties. * WHEN...From 10 AM Friday to 7 AM EST Saturday. The heaviest snow is expected Friday afternoon through Friday night. * IMPACTS...Plan on slippery road conditions. The hazardous travel conditions could impact the Friday evening commute. Gusty winds could bring down tree branches and cause significant blowing and drifting snow. * ADDITIONAL DETAILS...Near-blizzard conditions with very low visibility are possible at times late Friday night into early Saturday morning and could make travel extremely difficult. The heaviest snowfall is expected along and to the west of Route 219.
INSTRUCTION: Persons should delay travel if possible. If travel is absolutely necessary, drive with extreme caution and be prepared for sudden changes in visibility. Make sure your vehicle is winterized and in good working order.
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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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