Forecast Details for Salem, OR

Recent Locations: Spokane, WA Fox Lake, WI Salem, OR

Tonight: A slight chance of showers between 11pm and midnight. Mostly cloudy, with a low around 43. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

Wednesday: Showers likely before 2pm, then showers likely and possibly a thunderstorm between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 54. Light and variable wind becoming west southwest 5 to 9 mph in the morning. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: A 20 percent chance of showers before 11pm. Widespread frost, mainly after 5am. Snow level 2200 feet lowering to 1700 feet after midnight . Otherwise, partly cloudy, with a low around 34. West wind 5 to 8 mph becoming calm in the evening.

Thursday: Areas of frost before 9am. Otherwise, sunny, with a high near 55. Calm wind becoming north around 6 mph in the afternoon.

Thursday Night: Areas of frost after 3am. Otherwise, mostly clear, with a low around 34. North wind 5 to 7 mph.

Friday: Areas of frost before 8am. Otherwise, mostly sunny, with a high near 63.

Friday Night: Partly cloudy, with a low around 39.

Saturday: Partly sunny, with a high near 65.

Saturday Night: Partly cloudy, with a low around 41.

Sunday: A slight chance of rain after 11am. Partly sunny, with a high near 64.

Sunday Night: A chance of rain. Mostly cloudy, with a low around 41.

Monday: A chance of rain. Partly sunny, with a high near 58.

Monday Night: A chance of rain. Mostly cloudy, with a low around 42.

Tuesday: A chance of rain. Mostly cloudy, with a high near 56.

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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