Forecast Details for Herndon, WV

Recent Locations: Browning, MT Sorrento, FL Herndon, WV

Tonight: Mostly cloudy, with a low around 34. North wind around 6 mph becoming light and variable.

Monday: Rain and snow before 1pm, then rain and sleet likely between 1pm and 2pm, then rain after 2pm. High near 40. Southeast wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. Little or no snow and sleet accumulation expected.

Monday Night: Rain, mainly before 1am. Low around 36. Southeast wind 8 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday: A 30 percent chance of rain, mainly before 1pm. Mostly cloudy, with a high near 59. South wind around 8 mph.

Tuesday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 46. South wind around 6 mph.

Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 68.

Wednesday Night: Mostly cloudy, with a low around 51.

Thursday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 71.

Thursday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 53.

Friday: A 40 percent chance of rain. Partly sunny, with a high near 74.

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

Saturday: Rain likely. Partly sunny, with a high near 73. Chance of precipitation is 60%.

Saturday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 53.

Sunday: Rain likely. Mostly cloudy, with a high near 66. Chance of precipitation is 60%.

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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