Forecast Details for Merrillville, IN

Recent Locations: Pierre, SD   Merrillville, IN  
Current Alerts for Merrillville, IN: Air Quality Alert
Tonight: Patchy fog after 3am. Otherwise, mostly clear, with a low around 56. North northeast wind around 5 mph becoming calm in the evening.
Saturday: Areas of fog before 9am. Otherwise, sunny, with a high near 83. Calm wind becoming south around 5 mph in the morning.
Saturday Night: Mostly clear, with a low around 63. South wind around 5 mph.
Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 79. West southwest wind around 5 mph becoming north in the afternoon.
Sunday Night: Partly cloudy, with a low around 61. Northeast wind around 5 mph becoming south southeast after midnight.
Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85.
Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 85.
Tuesday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 64.
Wednesday: A chance of showers after 1pm. Mostly sunny, with a high near 79.
Wednesday Night: A chance of showers. Partly cloudy, with a low around 55.
Thursday: Mostly sunny, with a high near 72.
Thursday Night: Partly cloudy, with a low around 53.
Friday: Mostly sunny, with a high near 72.

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Current U.S. National Radar--Current

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Current U.S. National Radar

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Today's National Weather Map

National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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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 Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation