Forecast Details for Sac City, IA

Recent Locations: North Branch, MN Stoystown, PA Sac City, IA

Today: Showers, mainly after 4pm. Steady temperature around 46. Breezy, with an east wind 16 to 20 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers. Low around 38. Breezy, with an east wind 16 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

Thursday: Showers and possibly a thunderstorm. High near 49. Breezy, with an east wind 14 to 17 mph becoming west northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

Thursday Night: Cloudy, then gradually becoming partly cloudy, with a low around 32. West northwest wind 6 to 14 mph becoming northeast after midnight. Winds could gust as high as 20 mph.

Friday: Showers and possibly a thunderstorm. High near 51. East wind 11 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 29. Blustery. Chance of precipitation is 50%. 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 43. Windy.

Saturday Night: Mostly cloudy, with a low around 26. Windy.

Sunday: Sunny, with a high near 53.

Sunday Night: Partly cloudy, with a low around 32.

Monday: Partly sunny, with a high near 60.

Monday Night: Partly cloudy, with a low around 29.

Tuesday: Mostly sunny, with a high near 53.

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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