Weather Alert in Massachusetts
Severe Thunderstorm Warning issued June 6 at 5:32PM EDT until June 6 at 6:15PM EDT by NWS Boston/Norton MA
AREAS AFFECTED: Essex, MA; Middlesex, MA
DESCRIPTION: SVRBOX The National Weather Service in Boston/Norton has issued a * Severe Thunderstorm Warning for... Northwestern Essex County in northeastern Massachusetts... North central Middlesex County in northeastern Massachusetts... * Until 615 PM EDT. * At 532 PM EDT, a severe thunderstorm was located over Dunstable, or near Nashua, moving northeast at 20 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Hail damage to vehicles is expected. Expect wind damage to trees and power lines. * Locations impacted include... Lowell, Lawrence, Haverhill, Methuen, Chelmsford, Dracut, Westford, Pepperell, Tyngsborough, Groton, Littleton, and Dunstable.
INSTRUCTION: For your protection move to an interior room on the lowest floor of a building.
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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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