Weather Alert in Pennsylvania
Flash Flood Warning issued July 14 at 4:47PM EDT until July 14 at 8:30PM EDT by NWS State College PA
AREAS AFFECTED: Dauphin, PA; Lancaster, PA; Lebanon, PA
DESCRIPTION: FFWCTP The National Weather Service in State College has extended the * Flash Flood Warning for... Southeastern Dauphin County in south central Pennsylvania... Northwestern Lancaster County in south central Pennsylvania... South Central Lebanon County in south central Pennsylvania... * Until 830 PM EDT. * At 447 PM EDT, local law enforcement reported thunderstorms producing heavy rain in Mount Joy Township. Between 4 and 6 inches of rain have fallen. Additional rainfall amounts of 2 to 3 inches are possible in the warned area. Flash flooding is already occurring. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Law enforcement reported. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Elizabethtown, Columbia, Lititz, Mount Joy, Manheim, East Petersburg, Cornwall, Salunga-Landisville, Maytown, Rothsville, Mountville, Marietta, Rheems, Bainbridge, Quentin, Timber Hills, Mount Gretna Heights, Lawn, Penryn and Mount Gretna.
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 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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