Weather Alert in Pennsylvania
Extreme Cold Warning issued February 6 at 2:03AM EST until February 8 at 10:00AM EST by NWS State College PA
AREAS AFFECTED: Southern Clinton; Southern Lycoming
DESCRIPTION: * WHAT...For the Extreme Cold Warning, dangerously cold wind chills as low as 25 below expected. For the Wind Advisory, northwest winds 15 to 25 mph with gusts up to 50 mph expected. * WHERE...Southern Clinton and Southern Lycoming Counties. * WHEN...For the Extreme Cold Warning, from 1 AM Saturday to 10 AM EST Sunday. For the Wind Advisory, from 4 AM to 10 PM EST Saturday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. The dangerously cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes.
INSTRUCTION: Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects. Persons are urged to stay indoors until conditions improve. If you must go outside, dress in layers. Cover exposed skin to reduce your risk of frostbite or hypothermia. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly.
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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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