Weather Alert in Pennsylvania
Flood Warning issued February 23 at 5:52AM EST by NWS State College PA
AREAS AFFECTED: Dauphin, PA
DESCRIPTION: ...The National Weather Service in State College PA has issued a Flood Warning for the following rivers in Pennsylvania... Swatara Creek above Middletown affecting Dauphin County. .An ice jam will cause water to infiltrate the lowlands along the river. * WHAT...Minor flooding is occurring. * WHERE...Swatara Creek above Middletown. * WHEN...From early this morning until further notice. * IMPACTS...At 11.0 feet, Minor overbank flooding begins near the Vine Street Bridge downstream to the Susquehanna River. At 12.0 feet, Both banks overflow upstream of the Vine Street Bridge and several basements are affected. * ADDITIONAL DETAILS... - At 5:30 AM EST Monday the stage was 11.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 5:30 AM EST Monday was 11.8 feet. - Forecast...Ice jam flooding is inherently difficult to predict. Be prepared for rapid changes in river levels depending on ice jam behavior. - Flood stage is 11.0 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov. The next statement will be issued by this afternoon.
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
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A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
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Weather Topic: What is Rain?
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Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
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