Forecast Details for Chicago, IL

Your Recent Locations:  Chicago, IL  
Overnight: Showers, with thunderstorms also possible after 4am. Low around 40. Breezy, with an east wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday: Rain and possibly a thunderstorm before 10am, then showers and possibly a thunderstorm, mainly after 10am. High near 46. Breezy, with an east wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Thursday Night: Rain and possibly a thunderstorm. Low around 39. North wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday: A 40 percent chance of rain, mainly before 1pm. Cloudy, with a high near 44. North wind around 15 mph, with gusts as high as 25 mph.
Friday Night: Mostly cloudy, with a low around 36. North wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday: Mostly sunny, with a high near 47.
Saturday Night: Mostly cloudy, with a low around 38.
Sunday: A chance of rain. Mostly cloudy, with a high near 51.
Sunday Night: A chance of rain. Mostly cloudy, with a low around 43.
Monday: A chance of rain, mainly after 1pm. Mostly cloudy, with a high near 53.
Monday Night: Rain likely. Mostly cloudy, with a low around 44.
Tuesday: A chance of rain. Partly sunny, with a high near 53.
Tuesday Night: A chance of rain. Mostly cloudy, with a low around 42.
Wednesday: A chance of rain. Partly sunny, with a high near 55.

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Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

contrails Next Topic: Fog

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: Fog

Weather Topic: What are Fractus Clouds?

Home - Education - Cloud Types - Fractus Clouds

fractus clouds Next Topic: Hole Punch Clouds

A fractus cloud (scud) is a fragmented, tattered cloud which has likely been sheared off of another cloud. They are accessory clouds, meaning they develop from parent clouds, and are named in a way which describes the original cloud which contained them.

Fractus clouds which have originated from cumulus clouds are referred to as cumulus fractus, while fractus clouds which have originated from stratus clouds are referred to as stratus fractus. Under certain conditions a fractus cloud might merge with another cloud, or develop into a cumulus cloud, but usually a fractus cloud seen by itself will dissipate rapidly.

They are often observed on the leading and trailing edges of storm clouds, and are a display of wind activity.

Next Topic: Hole Punch Clouds