Weather Alert in Pennsylvania
Flood Watch issued June 14 at 2:41AM EDT until June 14 at 4:00PM EDT by NWS State College PA
AREAS AFFECTED: Elk; Cameron; Northern Clinton; Clearfield; Northern Centre; Southern Centre; Southern Clinton; Southern Lycoming; Union; Snyder; Montour; Northumberland; Columbia
DESCRIPTION: * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...A portion of central Pennsylvania, including the following areas, Cameron, Clearfield, Columbia, Elk, Montour, Northern Centre, Northern Clinton, Northumberland, Snyder, Southern Centre, Southern Clinton, Southern Lycoming and Union. * WHEN...Through this afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - A several hour period of moderate to heavy rainfall and possible embedded thunderstorms this morning could produce widespread rainfall amounts of 1 to 2 inches in the Watch area with local amounts exceeding 3 inches. Rainfall rates of 1 to 2 inches per hour could produce flash flooding. - http://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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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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