Weather Alert in Pennsylvania
Flood Advisory issued February 21 at 6:55AM EST until February 22 at 7:00AM EST by NWS Pittsburgh PA
AREAS AFFECTED: Allegheny, PA
DESCRIPTION: ...The Flood Advisory continues for the following rivers in Pennsylvania... Ohio River At Pittsburgh affecting Allegheny County. .Rain and snow melt will continue to result in elevated levels of the Ohio River at Pittsburgh through early Sunday. * WHAT...Flooding caused by rain and snowmelt continues. * WHERE...Ohio River at Pittsburgh. * WHEN...Until 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. * ADDITIONAL DETAILS... - At 6:45 AM EST Saturday the stage was 18.9 feet. - Bankfull stage is 18.0 feet. - Forecast...The river is expected to rise again to a crest of 18.9 feet this afternoon, before beginning to fall tonight. - Action stage is 18.0 feet. - Flood stage is 22.0 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: Caution is urged when walking near riverbanks. Additional information is available at weather.gov/pbz. The next statement will be issued this evening at 700 PM EST.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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