Weather Alert in Massachusetts
Coastal Flood Advisory issued August 21 at 1:03PM EDT until August 23 at 2:00AM EDT by NWS Boston/Norton MA
AREAS AFFECTED: Dukes; Nantucket
DESCRIPTION: * WHAT...Large breaking waves of 15 to 20 feet on south coastal beaches. Flooding of up to one foot deep on vulnerable coastal roads around high tide late tonight and late Friday night. * WHERE...Marthas Vineyard and Nantucket. * WHEN...For the High Surf Advisory, until 8 PM EDT Saturday. For the Coastal Flood Advisory, for high tides late tonight and late Friday night. * IMPACTS...Roads remain passable. Low lying areas and roads near Nantucket Harbor, including Easy Street, and Edgartown Harbor may experience pockets of shallow flooding less than one foot deep. Dangerous swimming and surfing conditions and significant beach and dune erosion.
INSTRUCTION: Do not drive around barricades or through water of unknown depth during high tide. Take the necessary actions to protect flood- prone property. Many ocean beaches are closed. Stay out out of the water due to dangerous surf conditions. Only view surf at a safe distance, not from near the shore.
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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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