Weather Alert in Pennsylvania
Flood Warning issued February 20 at 6:43PM EST until February 21 at 12:00AM EST by NWS Pittsburgh PA
AREAS AFFECTED: Armstrong, PA; Butler, PA; Clarion, PA; Venango, PA
DESCRIPTION: * WHAT...Flooding caused by an ice jam. * WHERE...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... * WHEN...Until midnight EST tonight. * IMPACTS...Flooding of areas near and downstream of the ice jam is occurring. Depending on ice behavior, any release of the ice jam could result in sudden rises of water, leading to a rapid flooding situation. * ADDITIONAL DETAILS... - At 639 PM EST, local law enforcement reported an ice jam on the Allegheny River near Emlenton. - Flooding is occurring near and downstream of the ice jam. - Some locations that will experience flooding include... Emlenton and Foxburg. - http://www.weather.gov/safety/flood
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 Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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