Weather Alert in Pennsylvania
Flood Advisory issued February 20 at 1:53PM EST until February 22 at 7:00AM EST by NWS Pittsburgh PA
AREAS AFFECTED: Allegheny, PA
DESCRIPTION: ...The National Weather Service in Pittsburgh has issued a Flood Advisory for the following rivers in Pennsylvania... Ohio River At Pittsburgh affecting Allegheny County. .Heavy rain and recent snow melt will cause river levels to increase over the next 24 hours. Additional information is available at weather.gov/pbz. The next statement will be issued late tonight at 215 AM EST. * WHAT...Flooding caused by rain and snowmelt. * WHERE...Ohio River at Pittsburgh. * WHEN...From this afternoon to Sunday morning. * IMPACTS...At 18.0 feet, Water begins to flow onto the Monongahela Parking Wharf. At 19.0 feet, Water begins to flow onto the North Shore Riverwalk between the stadiums. At 19.5 feet, The Monongahela Parking Wharf is completely flooded. At 20.0 feet, Water is up to one foot deep in the lower areas of the North Shore Riverwalk. * ADDITIONAL DETAILS... - At 1:30 PM EST Friday the stage was 17.0 feet. - Bankfull stage is 18.0 feet. - Forecast...The river is expected to rise to a crest of 18.2 feet early tomorrow afternoon. - Action stage is 18.0 feet. - Flood stage is 22.0 feet. - http://www.weather.gov/safety/flood
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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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