Weather Alert in Pennsylvania
Snow Squall Warning issued February 6 at 10:52PM EST until February 6 at 11:45PM EST by NWS Pittsburgh PA
AREAS AFFECTED: Allegheny, PA; Fayette, PA; Greene, PA; Indiana, PA; Washington, PA; Westmoreland, PA
DESCRIPTION: The National Weather Service in Pittsburgh has issued a * Snow Squall Warning for... Southeastern Allegheny County in southwestern Pennsylvania... Fayette County in southwestern Pennsylvania... Greene County in southwestern Pennsylvania... Southern Washington County in southwestern Pennsylvania... Westmoreland County in southwestern Pennsylvania... Southwestern Indiana County in west central Pennsylvania... * Until 1145 PM EST. * At 1052 PM EST, a hazardous snow squall was located along a line from 14 miles southeast of Black Lick to 5 miles west of Bentleyville, or along a line from 17 miles southeast of Homer City to 9 miles southeast of Washington, moving southeast at 45 mph. HAZARD...Intense bursts of heavy snow and gusty winds leading to blowing snow and rapidly falling visibility. Wind gusts greater than 35 mph. SOURCE...Radar indicated. IMPACT...Travel will become difficult and potentially hazardous within minutes. * Locations impacted include... Greensburg, Washington, Uniontown, Jeannette, Latrobe, Connellsville, Waynesburg, Gastonville, South Park Township, Jefferson Hills, Monessen, Clairton, California, Donora, Mount Pleasant, Scottdale, Monongahela, Charleroi, Irwin and Masontown. This includes the following highways... Interstate 70 in Pennsylvania between mile markers 6 and 15...and between mile markers 19 and 57. Interstate 79 in Pennsylvania between mile markers 1 and 37. Pennsylvania Turnpike between mile markers 67 and 99.
INSTRUCTION: Slow Down! Rapid changes in visibility and road conditions are expected with this dangerous snow squall. Be alert for sudden whiteout conditions. Reduce your speed and turn on headlights! During snow squalls, the visibility may suddenly drop to near zero in whiteout conditions.
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Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
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