Forecast Details for Longmont, CO

Recent Locations: East Stroudsburg, PA Austinburg, OH Longmont, CO

Overnight: A 20 percent chance of showers. Patchy fog. Otherwise, partly cloudy, with a low around 57. Calm wind.

Thursday: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 79. Calm wind becoming east around 5 mph in the afternoon.

Thursday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 56. Northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 30%.

Friday: A 30 percent chance of showers and thunderstorms after noon. Mostly sunny, with a high near 81. Calm wind becoming west northwest 5 to 7 mph in the afternoon.

Friday Night: A chance of showers and thunderstorms before midnight, then a slight chance of showers. Mostly cloudy, with a low around 56. Light northwest wind. Chance of precipitation is 30%.

Saturday: A chance of showers, with thunderstorms also possible after noon. Partly sunny, with a high near 77. Chance of precipitation is 50%.

Saturday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 52.

Sunday: Sunny, with a high near 79.

Sunday Night: Mostly clear, with a low around 53.

Labor Day: Sunny, with a high near 83.

Monday Night: Mostly clear, with a low around 54.

Tuesday: Sunny, with a high near 85.

Tuesday Night: Partly cloudy, with a low around 54.

Wednesday: A chance of showers and thunderstorms. Partly sunny, with a high near 75.

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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