Forecast Details for Denison, IA

Recent Locations: Washington, MI Clewiston, FL Denison, IA

Today: Showers and possibly a thunderstorm before 3pm, then a chance of showers between 3pm and 4pm. Patchy fog between 8am and 11am. High near 49. Breezy, with an east wind 11 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

Tonight: Cloudy, then gradually becoming partly cloudy, with a low around 31. Northwest wind 8 to 13 mph becoming light and variable. Winds could gust as high as 18 mph.

Friday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 10am. High near 51. East wind 10 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night: A chance of showers and thunderstorms before 7pm, then a chance of showers between 7pm and 1am. Mostly cloudy, with a low around 29. West northwest wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 45. Windy, with a west northwest wind 15 to 22 mph, with gusts as high as 32 mph.

Saturday Night: Partly cloudy, with a low around 25. Blustery.

Sunday: Sunny, with a high near 56.

Sunday Night: Mostly clear, with a low around 31.

Monday: Mostly cloudy, with a high near 51.

Monday Night: Mostly cloudy, with a low around 26.

Tuesday: Partly sunny, with a high near 52. Breezy.

Tuesday Night: Mostly cloudy, with a low around 38. Breezy.

Wednesday: A 30 percent chance of showers. Partly sunny, with a high near 71. Windy.

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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