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 is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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