Weather Alert in Pennsylvania
Flash Flood Warning issued June 17 at 2:35PM EDT until June 17 at 4:00PM EDT by NWS Pittsburgh PA
AREAS AFFECTED: Allegheny, PA
DESCRIPTION: At 235 PM EDT, Doppler radar indicated that the heaviest rain had exited the warned area for now, but flash flooding remains a threat. Between 0.5 and 1 inch of rain has fallen. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. Some locations that will experience flash flooding include... Pittsburgh, Penn Hills, Plum, Wilkinsburg, Swissvale, O'hara Township, Forest Hills, Wilkins Township, Oakmont, Fox Chapel, Sharpsburg, Edgewood, Churchill, Aspinwall, Verona, Blawnox, Braddock Hills and Oakland.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
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Weather Topic: What is Hail?
Home - Education - Precipitation - Hail
Next Topic: Hole Punch Clouds
Hail is a form of precipitation which is recognized by large solid balls or
clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind.
As the hailstones remain in the updraft, ice is deposited onto them until their
weight becomes heavy enough for them to fall to the earth's surface.
Hail storms can cause significant damage to crops, aircrafts, and man-made structures,
despite the fact that the duration is usually less than ten minutes.
Next Topic: Hole Punch Clouds
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
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