Weather Alert in New York
Special Weather Statement issued February 19 at 1:15AM EST by NWS Albany NY
AREAS AFFECTED: Southern Herkimer; Southern Fulton; Montgomery; Schoharie; Western Albany; Western Greene; Western Ulster
DESCRIPTION: Untreated wet ground surfaces from previous rain and melted snow will likely freeze overnight as temperatures drop into the 20s. This will allow for areas of black ice to form on untreated ground surfaces. Motorists and pedestrians should expect areas of icy travel conditions overnight through Thursday morning, especially on untreated ground surfaces and secondary roadways. Elevated roadways such as bridges and overpasses as well as highway on and off ramps will be particularly vulnerable to black ice formation and slippery travel conditions through Thursday morning.
INSTRUCTION: N/A
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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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