Weather Alert in Massachusetts
High Surf Advisory issued August 21 at 1:03PM EDT until August 23 at 8:00PM 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 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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