Forecast Details for Polk, PA

Recent Locations: Springfield, OR Pesotum, IL Polk, PA

This Afternoon: A chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 75. South wind 7 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: Showers and thunderstorms likely before 3am, then showers likely and possibly a thunderstorm between 3am and 5am, then a chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 60. Southeast wind 7 to 10 mph, with gusts as high as 23 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday: Showers likely before 10am, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 76. South wind 10 to 14 mph, with gusts as high as 26 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night: Showers and possibly a thunderstorm. Low around 58. Light and variable wind. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday: Showers, with thunderstorms also possible after 2pm. High near 80. South wind 5 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night: Showers and possibly a thunderstorm. Low around 43. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Sunday: Mostly cloudy, with a high near 50.

Sunday Night: Mostly cloudy, with a low around 32.

Monday: Mostly sunny, with a high near 50.

Monday Night: A chance of snow showers, mixing with rain after 8pm, then gradually ending. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.

Tuesday: Mostly sunny, with a high near 44.

Tuesday Night: Mostly clear, with a low around 24.

Wednesday: Sunny, with a high near 56.

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National Weather Forecast--Current

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North America Water Vapor (Moisture)

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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