Forecast Details for Sunnyvale, CA

Recent Locations: Fort Lauderdale, FL Lubbock, TX Sunnyvale, CA

Tonight: Patchy fog after midnight. Otherwise, increasing clouds, with a low around 44. West northwest wind around 6 mph becoming calm in the evening.

Friday: Patchy fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 63. Calm wind becoming northwest 5 to 7 mph in the afternoon.

Friday Night: Patchy fog between 4am and 5am. Otherwise, mostly cloudy, with a low around 42. West northwest wind around 5 mph becoming calm in the evening.

Saturday: Patchy fog between 7am and 8am. Otherwise, mostly cloudy, with a high near 61. Calm wind becoming south southwest around 6 mph in the afternoon.

Saturday Night: Showers likely, mainly after 4am. Mostly cloudy, with a low around 47. South southeast wind around 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Sunday: Showers. High near 60. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

Sunday Night: Showers. Low around 47. Chance of precipitation is 100%.

Washington's Birthday: Showers. Cloudy, with a high near 57.

Monday Night: Showers. Cloudy, with a low around 43.

Tuesday: Showers. Mostly cloudy, with a high near 53.

Tuesday Night: Showers likely. Mostly cloudy, with a low around 40.

Wednesday: Showers likely. Mostly cloudy, with a high near 55.

Wednesday Night: Showers likely. Mostly cloudy, with a low around 42.

Thursday: Showers likely. Mostly cloudy, with a high near 56.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

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 is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds