Forecast Details for Harvey, IA

Recent Locations: Spurgeon, IN Marathon, WI Harvey, IA

Current Alerts for Harvey, IA: Tornado Watch

Tonight: A 40 percent chance of showers and thunderstorms, mainly before 11pm. Some of the storms could be severe. Mostly cloudy, with a low around 52. West wind 6 to 8 mph. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: Sunny, with a high near 78. West northwest wind 6 to 9 mph becoming southwest in the afternoon.

Thursday Night: Mostly clear, with a low around 57. South southeast wind 6 to 10 mph, with gusts as high as 18 mph.

Friday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 80. Breezy, with a south southeast wind 11 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Friday Night: Showers and thunderstorms likely before 1am, then a chance of showers. Mostly cloudy, with a low around 38. Southwest wind around 15 mph becoming north northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

Saturday: A 10 percent chance of showers before 7am. Sunny, with a high near 51. Breezy.

Saturday Night: Mostly clear, with a low around 33.

Sunday: Sunny, with a high near 60.

Sunday Night: Mostly clear, with a low around 38.

Monday: Sunny, with a high near 71. Breezy.

Monday Night: Partly cloudy, with a low around 51.

Tuesday: Sunny, with a high near 74.

Tuesday Night: Mostly clear, with a low around 51.

Wednesday: Mostly sunny, with a high near 73.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

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