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
INSTRUCTION: N/A
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Weather Topic: What are Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
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