Weather Alert in New York
Special Weather Statement issued March 4 at 2:49AM EST by NWS Buffalo NY
AREAS AFFECTED: Niagara; Orleans; Monroe; Wayne; Northern Cayuga; Oswego; Jefferson; Lewis; Northern Erie; Genesee; Wyoming; Livingston; Ontario; Chautauqua; Cattaraugus; Allegany; Southern Erie
DESCRIPTION: Areas of fog will persist across much of the area through early this morning...and will help to maintain existing wet ground conditions. Coupled with temperatures around or a little below freezing...this will allow wet roads, bridges, parking lots, driveways and sidewalks to become icy in spots. If you will be out and about this morning...be careful for black ice and slick spots on area roadways, bridges, overpasses, parking lots, driveways, and sidewalks...particularly where these surfaces have not been treated. The black ice threat will come to an end by mid to late morning as the fog dissipates, road surfaces dry out, and temperatures rise above freezing.
INSTRUCTION: N/A
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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