Weather Alert in Pennsylvania
Severe Thunderstorm Warning issued June 30 at 11:25PM EDT until July 1 at 12:15AM EDT by NWS State College PA
AREAS AFFECTED: Lancaster, PA
DESCRIPTION: At 1123 PM EDT, severe thunderstorms were located along a line extending from Mount Joy to East Petersburg to Safe Harbor, moving east at 45 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Lancaster, Ephrata, Elizabethtown, Columbia, Lititz, Millersville, Willow Street, Mount Joy, New Holland, Manheim, East Petersburg, and Akron. This includes The Pennsylvania Turnpike from mile markers 269 to 295.
INSTRUCTION: Stay inside a well built structure and keep away from windows. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. A Flash flood Emergency is in effect for much of Lancaster County until 245 AM EDT.
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
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