Weather Alert in Pennsylvania
Flash Flood Warning issued July 9 at 6:40PM EDT until July 9 at 9:45PM EDT by NWS State College PA
AREAS AFFECTED: Lancaster, PA; York, PA
DESCRIPTION: FFWCTP The National Weather Service in State College has issued a * Flash Flood Warning for... Southeastern Lancaster County in south central Pennsylvania... Southeastern York County in south central Pennsylvania... * Until 945 PM EDT. * At 640 PM EDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to 1 inch of rain has fallen. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Paradise, Quarryville, Gap, Delta, Wakefield, Holtwood, Sunnyburn, Susquehanna Trails, Intercourse, Christiana, Georgetown, Fawn Grove, Kirkwood, Little Britain, Buck, Peach Bottom and White Horse.
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads.
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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
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.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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