Forecast Details for Calmar, IA

Recent Locations: Conway, SC Rush, CO Calmar, IA

Tonight: Partly cloudy, with a low around 31. Northwest wind 8 to 14 mph.

Monday: Partly sunny, with a high near 41. Breezy, with a northwest wind 14 to 17 mph.

Monday Night: Partly cloudy, with a low around 19. North wind 6 to 14 mph.

Tuesday: Mostly sunny, with a high near 41. East wind 5 to 11 mph becoming southeast in the afternoon.

Tuesday Night: Rain likely, possibly mixed with snow showers, becoming all rain after 4am. Mostly cloudy, with a low around 33. Breezy, with a southeast wind 11 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

Wednesday: Showers likely, mainly after 1pm. Partly sunny, with a high near 62. Breezy, with a south wind 21 to 25 mph, with gusts as high as 33 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Wednesday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 42. Breezy, with a southwest wind 9 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 70%.

Thursday: A 30 percent chance of showers, mainly after 1pm. Mostly sunny, with a high near 57. West wind around 10 mph.

Thursday Night: A 40 percent chance of showers. Partly cloudy, with a low around 34. Northwest wind around 7 mph becoming north after midnight.

Friday: A 40 percent chance of showers. Mostly sunny, with a high near 56. Northeast wind around 7 mph.

Friday Night: A 40 percent chance of showers. Partly cloudy, with a low around 39. East wind around 8 mph.

Saturday: A 50 percent chance of showers. Partly sunny, with a high near 59. East wind 8 to 11 mph, with gusts as high as 20 mph.

Saturday Night: Showers likely. Mostly cloudy, with a low around 49. Southeast wind around 11 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 69. South wind 11 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 70%.

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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