Forecast Details for Harpers Ferry, IA

Recent Locations: Huddleston, VA Hastings, FL Harpers Ferry, IA

Today: Increasing clouds, with a high near 52. East wind 7 to 11 mph, with gusts as high as 20 mph.

Tonight: Showers, mainly after 11pm. Low around 35. East wind 11 to 13 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, with thunderstorms also possible after 10am. High near 61. East wind around 10 mph becoming south in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

Thursday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 36. Southwest wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: Showers likely and possibly a thunderstorm, mainly after 4pm. Partly sunny, with a high near 61. Calm wind becoming east 5 to 7 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night: Showers and possibly a thunderstorm. Low around 40. East wind around 7 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday: A 40 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 49. West wind 7 to 13 mph, with gusts as high as 22 mph.

Saturday Night: Mostly cloudy, with a low around 29. West wind 10 to 14 mph, with gusts as high as 24 mph.

Sunday: Mostly sunny, with a high near 51. Northwest wind 7 to 13 mph, with gusts as high as 21 mph.

Sunday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 29. Northwest wind 5 to 7 mph becoming calm in the evening.

Monday: A 40 percent chance of showers. Partly sunny, with a high near 53. Calm wind becoming northwest 5 to 7 mph in the morning.

Monday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 29. North wind 3 to 6 mph.

Tuesday: Partly sunny, with a high near 50. Northeast wind around 6 mph.

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National Weather Forecast--Current

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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