Weather Alert in Pennsylvania
Winter Weather Advisory issued March 16 at 3:33AM EDT until March 17 at 5:00PM EDT by NWS State College PA
AREAS AFFECTED: Cambria; Somerset
DESCRIPTION: * WHAT...Snow expected. Total snow accumulations up to three inches, with higher amounts possible on ridgetops. Winds gusting as high as 45 mph. * WHERE...Cambria and Somerset Counties. * WHEN...From 5 PM this afternoon to 5 PM EDT Tuesday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Monday evening and Tuesday morning commutes. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...Snowfall rates >1" are likely this evening as cold air surges in and changes rain to snow in the wake of a cold front. Rapid accumulation on roadways is possible as most of the snow will fall after sunset. Most of the snow accumulation will occur tonight, but scattered snow showers will continue into Tuesday.
INSTRUCTION: Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.
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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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