Weather Alert in New York
Dense Fog Advisory issued February 17 at 6:41AM EST until February 18 at 7:00AM EST by NWS Buffalo NY
AREAS AFFECTED: Niagara; Orleans; Monroe; Wayne; Northern Cayuga; Oswego; Jefferson; Lewis; Genesee; Wyoming; Livingston; Ontario; Chautauqua; Cattaraugus; Allegany
DESCRIPTION: * WHAT...Visibility as low as one quarter mile at times in dense fog. * WHERE...Niagara, Orleans, Monroe, Wayne, Northern Cayuga, Oswego, Jefferson, Lewis, Genesee, Wyoming, Livingston, Ontario, Chautauqua, Cattaraugus, and Allegany Counties. Greatest duration of dense fog expected across hill tops, and near the eastern Great Lake shorelines. * WHEN...Until 7 AM EST Wednesday. Visibilities may improve slightly this afternoon and evening before lowering again tonight. * IMPACTS...Hazardous driving conditions due to low visibility.
INSTRUCTION: If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
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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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