Forecast Details for San Francisco International Airport, CA

Tonight: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 54. Southeast wind 6 to 11 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Monday: A 30 percent chance of rain, mainly after 5pm. Mostly cloudy, with a high near 64. Light and variable wind becoming south 5 to 9 mph in the morning. New precipitation amounts of less than a tenth of an inch possible.
Monday Night: Rain, mainly after 10pm. Low around 52. South wind 16 to 18 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday: Showers and possibly a thunderstorm, mainly before 10am, then a chance of showers and thunderstorms after 10am. High near 59. West wind 14 to 20 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night: Mostly clear, with a low around 46. West northwest wind 11 to 18 mph.
Christmas Day: Mostly sunny, with a high near 56.
Wednesday Night: A 30 percent chance of rain after 10pm. Mostly cloudy, with a low around 48.
Thursday: Rain likely, mainly before 4pm. Mostly cloudy, with a high near 60.
Thursday Night: Rain likely, mainly after 10pm. Mostly cloudy, with a low around 51.
Friday: Rain likely. Mostly cloudy, with a high near 60.
Friday Night: Rain likely. Cloudy, with a low around 54.
Saturday: Rain likely. Cloudy, with a high near 62.
Saturday Night: Rain likely. Mostly cloudy, with a low around 54.
Sunday: Rain likely. Mostly cloudy, with a high near 62.

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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).

Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

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

Tomorrows National Weather Map

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.

North American Water Vapor Map

Weather Topic: What is Graupel?

Home - Education - Precipitation - Graupel

Graupel Next Topic: Hail

Graupel is a form of precipitation that is created by atmospheric conditions which cause supercooled water droplets to contact snow crystals and freeze to their surface.

Sometimes known as soft hail or snow pellets, graupel is delicate and easily destroyed by touch. Whereas hail usually falls during severe weather, graupel doesn't require such conditions to form, and can form in mild precipitation similar to situations which produce snowfall.

Next Topic: Hail

Weather Topic: What are Hole Punch Clouds?

Home - Education - Cloud Types - Hole Punch Clouds

Hole Punch Clouds Next Topic: Mammatus Clouds

A hole punch cloud is an unusual occurrence when a disk-shaped hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.

When part of the cloud forms ice crystals, water droplets in the surrounding area of the cloud evaporate. The effect of this process produces a large elliptical gap in the cloud. The hole punch cloud formation is rare, but it is not specific to any geographic area.

Other names which have been used to describe this phenomena include fallstreak hole, skypunch, and cloud hole.

Next Topic: Mammatus Clouds