Weather Alert in Pennsylvania
Dense Fog Advisory issued September 4 at 10:32PM EDT until September 5 at 10:00AM EDT by NWS State College PA
AREAS AFFECTED: Warren; McKean; Potter; Elk; Cameron; Northern Clinton; Clearfield; Northern Centre; Cambria; Tioga; Northern Lycoming
DESCRIPTION: * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...A portion of central Pennsylvania. * WHEN...Until 10 AM EDT Friday. * IMPACTS...Hazardous driving conditions due to reduced visibility. The visibility may be near zero in places.
INSTRUCTION: If driving, slow down, use your low-beam headlights, and leave plenty of distance ahead of you. Allow plenty of extra time to reach your destination.
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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
Weather Topic: What are Stratocumulus Clouds?
Home - Education - Cloud Types - Stratocumulus Clouds
Next Topic: Stratus Clouds
Stratocumulus clouds are similar to altocumulus clouds in their
fluffy appearance, but have a slightly darker shade due to their additional mass.
A good way to distinguish the two cloud types is to hold your hand out and measure
the size of an individual cloud; if it is the size of your thumb it is generally
an altocumulus cloud, if it is the size of your hand it is generally a
stratocumulus cloud.
It is uncommon for stratocumulus clouds to produce precipitation, but if they do
it is usually a light rain or snow.
Next Topic: Stratus Clouds
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