Weather Alert in Pennsylvania
Special Weather Statement issued February 11 at 2:11PM EST by NWS State College PA
AREAS AFFECTED: Warren; McKean; Elk; Clearfield; Cambria; Somerset
DESCRIPTION: Deepening cold and relatively moist air being lifted across the Mountains of Western Pennsylvania will result in fairly persistent light snow late today through Thursday. Snowfall rates will peak at only around one-quarter of an inch per hour for much of the area along and to the east of the Route 219 corridor. However, a few periods of snowfall rates of one half inch per hour or greater will likely occur in the areas of greatest upslope flow, such as the ski areas of the Laurel Highlands and the perennial snowbelt of Northern Warren County. Total snowfall during this 24 to 30 hour period will range from just an inch or two in the valleys near and to the east of Route 219, to as much as 4 or 5 inches along the crest of Laurel Ridge in Somerset County. Roads could become snow covered and slippery tonight and Thursday as temperatures settle into the upper teens to low 20s for the bulk of the time. Use extra caution and allow extra time to reach your destination if you plan to travel.
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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