Weather Alert in Pennsylvania
Flash Flood Warning issued February 20 at 10:58AM EST until February 20 at 4:00PM EST by NWS Pittsburgh PA
AREAS AFFECTED: Armstrong, PA; Butler, PA; Clarion, PA; Venango, PA
DESCRIPTION: FFWPBZ The National Weather Service in Pittsburgh has extended the * Flash Flood Warning for... An Ice Jam Break in... Southern Venango County in northwestern Pennsylvania... Northwestern Armstrong County in west central Pennsylvania... Northeastern Butler County in west central Pennsylvania... Western Clarion County in west central Pennsylvania... * Until 400 PM EST. * At 1058 AM EST, local law enforcement reported an ice jam on the Allegheny River at Emlenton, PA broke causing flash flooding downstream. HAZARD...Flash flooding from an ice jam break. SOURCE...Law enforcement reported. IMPACT...Flooding of areas near and downstream of the ice jam break. * The nearest downstream town is Foxburg.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. Stay away or be swept away. River banks and culverts can become unstable and unsafe.
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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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