Weather Alert in Pennsylvania
Winter Weather Advisory issued February 6 at 1:31AM EST until February 7 at 1:00AM EST by NWS Cleveland OH
AREAS AFFECTED: Northern Erie; Crawford
DESCRIPTION: * WHAT...Snow and blowing snow expected. Total snow accumulations between 2 and 5 inches, with the greatest accumulations in the higher elevations. Winds gusting as high as 45 mph. * WHERE...Crawford and Northern Erie Counties. * WHEN...From 7 AM this morning to 1 AM EST Saturday. * IMPACTS...Plan on slippery road conditions. Patchy blowing snow can reduce visibility this evening and tonight. The hazardous conditions could impact the Friday morning and evening commutes. * ADDITIONAL DETAILS...A period of light to moderate snow is expected this morning, with snow covered roads possible during and after the morning commute. After a few hours of dry weather this afternoon, snow showers and squalls, wind gusts up to 45 mph, and falling temperatures will lead to blowing and drifting snow and hazardous road conditions this evening.
INSTRUCTION: Slow down and use caution while traveling. The Pennsylvania Department of Transportation and Pennsylvania Turnpike Commission strongly encourage motorists to heed all travel restrictions and delay unnecessary travel. Visit www.511pa.com for the latest travel, roadway, and traffic conditions.
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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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