Weather Alert in Pennsylvania
Severe Thunderstorm Warning issued March 31 at 8:57PM EDT until March 31 at 10:15PM EDT by NWS Pittsburgh PA
AREAS AFFECTED: Armstrong, PA; Butler, PA; Clarion, PA; Forest, PA; Jefferson, PA; Mercer, PA; Venango, PA
DESCRIPTION: SVRPBZ The National Weather Service in Pittsburgh has issued a * Severe Thunderstorm Warning for... Forest County in northwestern Pennsylvania... Southeastern Mercer County in northwestern Pennsylvania... Venango County in northwestern Pennsylvania... Northern Armstrong County in west central Pennsylvania... Northeastern Butler County in west central Pennsylvania... Clarion County in west central Pennsylvania... Jefferson PA County in west central Pennsylvania... * Until 1015 PM EDT. * At 857 PM EDT, severe thunderstorms were located along a line from 15 miles north of Oil City to over Grove City, moving east at 55 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Oil City, Grove City, Franklin, Clarion, Brookville, Marienville, Knox, Sugarcreek, Reynoldsville, Brockway, Tionesta, Hasson Heights, Sykesville, Falls Creek, Seneca, Harrisville, Parker, Polk, Sligo and Emlenton.
INSTRUCTION: Seek shelter inside a well-built structure and stay away from windows. These storms are capable of producing damaging winds.
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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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