Forecast Details for Harlan, IA

Recent Locations: Mount Union, IA Elm Grove, LA Harlan, IA

This Afternoon: A 20 percent chance of rain. Cloudy, with a high near 45. Breezy, with a west northwest wind around 23 mph, with gusts as high as 32 mph.

Tonight: Areas of frost after 1am. Otherwise, mostly cloudy during the early evening, then gradual clearing, with a low around 27. Northwest wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 25 mph.

Sunday: Areas of frost before 10am. Otherwise, sunny, with a high near 59. West northwest wind 6 to 10 mph, with gusts as high as 18 mph.

Sunday Night: A slight chance of rain and snow between 1am and 4am, then a slight chance of rain after 4am. Increasing clouds, with a low around 30. North wind around 7 mph. Chance of precipitation is 20%.

Monday: A 40 percent chance of rain, mainly before 1pm. Mostly cloudy, with a high near 43. North wind 6 to 10 mph, with gusts as high as 16 mph.

Monday Night: A slight chance of rain and snow before 10pm, then a chance of snow. Mostly cloudy, with a low around 24. East wind around 8 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday: A chance of snow before 1pm, then a chance of rain and snow. Cloudy, with a high near 42. Southeast wind 9 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

Tuesday Night: A chance of rain. Mostly cloudy, with a low around 35. Breezy, with a southeast wind 15 to 18 mph, with gusts as high as 28 mph.

Wednesday: A chance of rain, with thunderstorms also possible after 1pm. Partly sunny, with a high near 67. Breezy, with a south wind 20 to 23 mph, with gusts as high as 33 mph.

Wednesday Night: A chance of rain and thunderstorms. Mostly cloudy, with a low around 38. West southwest wind 8 to 14 mph becoming north after midnight. Winds could gust as high as 21 mph.

Thursday: Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 54. Northeast wind 9 to 13 mph, with gusts as high as 21 mph.

Thursday Night: Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 38. East wind around 11 mph, with gusts as high as 18 mph.

Friday: Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 60. East southeast wind 10 to 14 mph, with gusts as high as 22 mph.

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North America Water Vapor (Moisture)

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Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds