Forecast Details for Johnston City, IL

Recent Locations: San Francisco International Airport, CA Brentwood, TN Johnston City, IL

This Afternoon: Partly sunny, with a high near 82. North northwest wind around 9 mph.

Tonight: A chance of showers before 1am, then a chance of showers and thunderstorms between 1am and 4am, then showers likely after 4am. Mostly cloudy, with a low around 53. North northwest wind 5 to 9 mph. Chance of precipitation is 60%.

Saturday: A 30 percent chance of showers before 7am. Mostly cloudy through mid morning, then gradual clearing, with a high near 76. Northwest wind 3 to 8 mph.

Saturday Night: Clear, with a low around 49. Light and variable wind.

Sunday: Sunny, with a high near 78. Calm wind becoming north 5 to 8 mph in the morning.

Sunday Night: Clear, with a low around 47. North wind around 5 mph becoming calm in the evening.

Monday: Sunny, with a high near 80. Calm wind becoming east around 6 mph in the afternoon.

Monday Night: Mostly clear, with a low around 51. East wind around 5 mph becoming calm in the evening.

Tuesday: Mostly sunny, with a high near 85. Calm wind becoming south southeast around 6 mph in the morning.

Tuesday Night: Mostly clear, with a low around 58. Light southeast wind.

Wednesday: Sunny, with a high near 91. Calm wind becoming southwest around 5 mph in the afternoon.

Wednesday Night: Mostly clear, with a low around 61. Calm wind.

Thursday: Sunny, with a high near 90. Calm wind becoming northeast around 6 mph in the afternoon.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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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