Weather Alert in Pennsylvania
Winter Storm Warning issued February 21 at 1:43PM EST until February 23 at 1:00PM EST by NWS State College PA
AREAS AFFECTED: Dauphin; Schuylkill; Lebanon; Adams; York; Lancaster
DESCRIPTION: ...IMPACTFUL WINTER STORM TO BRING HEAVY SNOWFALL TO CENTRAL PENNSYLVANIA... * WHAT...Heavy snow likely. Total snow accumulations between 6 and 12 inches possible. Winds could gust as high as 40 mph Sunday night and Monday. * WHERE...A portion of central Pennsylvania. * WHEN...From 5 AM Sunday to 1 PM EST Monday. * IMPACTS...The strong winds and weight of snow on tree limbs may down power lines and could cause sporadic power outages. Travel could be very difficult to impossible. The hazardous conditions could impact the Monday morning commute. * ADDITIONAL DETAILS...Uncertainty remains for where the heaviest snow bands will occur. Snow totals could be higher depending on these localized bands. Snowfall at times could exceed 1 inch per hour rates.
INSTRUCTION: Persons are urged to stay indoors until conditions improve. If you must go outside, dress in layers. Several layers of clothes will keep you warmer than a single heavy coat. Cover exposed skin to reduce your risk of frostbite or hypothermia. Gloves, a scarf, and a hat will keep you from losing your body heat. Persons should consider delaying all travel. Motorists should use extreme caution if travel is absolutely necessary.
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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