Weather Alert in Pennsylvania
Flood Watch issued February 19 at 11:08AM EST until February 20 at 1:00PM EST by NWS Pittsburgh PA
AREAS AFFECTED: Venango; Forest; Lawrence; Butler; Clarion; Jefferson; Armstrong; Westmoreland; Westmoreland Ridges; Fayette; Fayette Ridges; Indiana; Higher Elevations of Indiana
DESCRIPTION: An ice jam may cause water to infiltrate the lowlands along rivers. * WHAT...Flooding caused by ice jams is possible. * WHERE...Portions of northwest, southwest, and western Pennsylvania, including the following areas, in northwest Pennsylvania, Forest, Jefferson PA and Venango. In southwest Pennsylvania, Fayette, Higher Elevations of Fayette, Higher Elevations of Westmoreland and Lawrence. In western Pennsylvania, Armstrong, Butler, Clarion, Higher Elevations of Indiana, Indiana and Westmoreland. * WHEN...Through Friday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood prone locations. * ADDITIONAL DETAILS... - Ice jam potential. - http://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
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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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