Forecast Details for San Francisco, CA

Your Recent Locations:  San Francisco, CA  
Today: Sunny, with a high near 86. Light and variable wind becoming west 9 to 14 mph in the afternoon.
Tonight: Clear, with a low around 60. West wind 6 to 15 mph becoming north after midnight. Winds could gust as high as 18 mph.
Wednesday: Sunny, with a high near 88. North wind 5 to 9 mph becoming west in the afternoon.
Wednesday Night: Mostly clear, with a low around 59. West southwest wind 7 to 13 mph.
Thursday: Sunny, with a high near 80. Light west southwest wind becoming west 8 to 13 mph in the afternoon.
Thursday Night: Mostly clear, with a low around 57.
Friday: Sunny, with a high near 71.
Friday Night: Mostly clear, with a low around 58.
Saturday: Sunny, with a high near 72.
Saturday Night: Mostly clear, with a low around 56.
Sunday: Sunny, with a high near 76.
Sunday Night: Clear, with a low around 56.
Monday: Sunny, with a high near 74.

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Current U.S. National Radar--Current

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

precipitation Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

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