Forecast Details for Chicago, IL

Your Recent Locations:  Chicago, IL  
Overnight: Rain likely with areas of drizzle before 5am, then patchy drizzle with a chance of rain after 5am. Patchy fog. Otherwise, cloudy, with a steady temperature around 46. West southwest wind around 5 mph becoming north. Winds could gust as high as 10 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday: Rain, mainly before 3pm. Patchy fog before 8am. Temperature falling to around 39 by 4pm. Breezy, with a north wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night: Mostly cloudy, with a low around 27. Blustery, with a northwest wind 15 to 25 mph, with gusts as high as 35 mph.
Sunday: Mostly sunny, with a high near 34. West northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night: Mostly clear, with a low around 30. Southwest wind around 10 mph, with gusts as high as 15 mph.
Monday: Sunny, with a high near 48.
Monday Night: Mostly clear, with a low around 39.
Tuesday: Mostly sunny, with a high near 46.
Tuesday Night: Mostly clear, with a low around 26.
Wednesday: Mostly sunny, with a high near 34.
Wednesday Night: Partly cloudy, with a low around 28.
Thanksgiving Day: Mostly sunny, with a high near 39.
Thursday Night: Partly cloudy, with a low around 33.
Friday: Mostly sunny, with a high near 45.

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Weather Topic: What are Hole Punch Clouds?

Home - Education - Cloud Types - Hole Punch Clouds

hole punch clouds Next Topic: Mammatus Clouds

A hole punch cloud is an unusual occurrence when a disk-shaped hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.

When part of the cloud forms ice crystals, water droplets in the surrounding area of the cloud evaporate. The effect of this process produces a large elliptical gap in the cloud. The hole punch cloud formation is rare, but it is not specific to any geographic area.

Other names which have been used to describe this phenomena include fallstreak hole, skypunch, and cloud hole.

Next Topic: Mammatus Clouds

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

shelf clouds Next Topic: Wall Clouds

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Wall Clouds