Weather Alert in Pennsylvania
Severe Thunderstorm Warning issued March 31 at 6:45PM EDT until March 31 at 7:15PM EDT by NWS Pittsburgh PA
AREAS AFFECTED: Mercer, PA
DESCRIPTION: At 645 PM EDT, severe thunderstorms were located along a line from 25 miles northwest of Sugarcreek to 7 miles northwest of Sharon, or along a line from 27 miles northwest of Franklin to 7 miles northwest of Sharpsville, moving east at 60 mph. HAZARD...60 mph wind gusts and small hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Hermitage, Sharpsville, Greenville, Stoneboro, Sandy Lake, Clark, Jamestown, Fredonia, Jackson Center, New Lebanon, Sheakleyville and Maurice K Goddard State Park.
INSTRUCTION: Seek shelter inside a well-built structure and stay away from windows. These storms are capable of producing damaging winds. Report severe weather to your nearest law enforcement agency or the National Weather Service office in Pittsburgh PA.
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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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