Forecast Details for Mount Wilson, CA

Recent Locations: Powers, MI Cairo, WV Mount Wilson, CA

Overnight: Mostly clear, with a low around 24. West wind around 5 mph.

Friday: Sunny, with a high near 56. Wind chill values as low as 20 early. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

Friday Night: Mostly cloudy, with a low around 20. Wind chill values as low as 15. South southwest wind 5 to 10 mph.

Saturday: A 20 percent chance of rain after 11am. Mostly cloudy, with a high near 51. Wind chill values as low as 10 early. South wind 10 to 15 mph, with gusts as high as 20 mph.

Saturday Night: Rain likely before 11pm, then rain and snow likely. Mostly cloudy, with a low around 16. Southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

Sunday: A slight chance of rain and snow before 11am, then a slight chance of rain. Mostly sunny, with a high near 51. Chance of precipitation is 20%.

Sunday Night: Partly cloudy, with a low around 37.

Monday: Mostly sunny, with a high near 53.

Monday Night: Mostly clear, with a low around 41.

Tuesday: Mostly sunny, with a high near 58.

Tuesday Night: Partly cloudy, with a low around 43.

Wednesday: A slight chance of rain. Mostly sunny, with a high near 58.

Wednesday Night: A slight chance of rain. Mostly clear, with a low around 45.

Thursday: Sunny, with a high near 63.

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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