Forecast Details for Sunnyvale, CA

Recent Locations: West Jordan, UT Killeen, TX Sunnyvale, CA

Tonight: Patchy fog after 9pm. Otherwise, mostly cloudy, with a low around 51. Calm wind.

Monday: Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 64. North northwest wind around 6 mph.

Monday Night: A 30 percent chance of rain after 4am. Cloudy, with a low around 47. Calm wind.

Tuesday: Rain, mainly after 10am. High near 58. South wind 3 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Tuesday Night: Rain. Patchy fog after 1am. Low around 45. South wind 6 to 8 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday: Rain likely, mainly before 4pm. Areas of fog before 10am. Otherwise, mostly cloudy, with a high near 58. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night: A 30 percent chance of rain, mainly before 10pm. Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 42.

Thursday: Patchy fog before 10am. Otherwise, mostly sunny, with a high near 61.

Thursday Night: Patchy fog after midnight. Otherwise, mostly clear, with a low around 41.

Friday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 63.

Friday Night: A slight chance of rain. Patchy fog. Otherwise, mostly cloudy, with a low around 44.

Saturday: A chance of rain. Patchy fog. Otherwise, mostly cloudy, with a high near 59.

Saturday Night: Rain likely. Mostly cloudy, with a low around 42.

Sunday: Rain likely. Mostly cloudy, with a high near 55.

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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

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

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