Forecast Details for Portland, OR

Recent Locations: Chula Vista, CA Birmingham, AL Portland, OR

Tonight: Increasing clouds, with a low around 38. Calm wind.

Friday: Rain likely, mainly after 2pm. Cloudy, with a high near 49. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 60%.

Friday Night: Rain. Low around 42. South southwest wind around 6 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday: Rain likely, mainly before 10am. Cloudy, with a high near 48. Calm wind becoming north around 6 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Saturday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 37. North wind 3 to 5 mph.

Sunday: A 30 percent chance of rain, mainly before 10am. Partly sunny, with a high near 52.

Sunday Night: A slight chance of rain and snow after 4am. Partly cloudy, with a low around 35. Chance of precipitation is 10%.

Washington's Birthday: A slight chance of rain and snow before 10am, then a chance of rain. Snow level 2200 feet. Mostly cloudy, with a high near 47.

Monday Night: Rain likely. Snow level 2200 feet lowering to 1600 feet after midnight . Mostly cloudy, with a low around 35.

Tuesday: Rain likely. Snow level 1400 feet. Mostly cloudy, with a high near 44.

Tuesday Night: Rain and snow likely. Snow level 1400 feet. Mostly cloudy, with a low around 34.

Wednesday: Rain and snow. Snow level 1200 feet rising to 1900 feet in the afternoon. Mostly cloudy, with a high near 45.

Wednesday Night: Rain and snow. Snow level 1700 feet. Mostly cloudy, with a low around 35.

Thursday: Rain and snow. Snow level 1400 feet. Mostly cloudy, with a high near 45.

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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

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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 Fractus Clouds?

Home - Education - Cloud Types - Fractus Clouds

Fractus Clouds Next Topic: Freezing Rain

A fractus cloud (scud) is a fragmented, tattered cloud which has likely been sheared off of another cloud. They are accessory clouds, meaning they develop from parent clouds, and are named in a way which describes the original cloud which contained them.

Fractus clouds which have originated from cumulus clouds are referred to as cumulus fractus, while fractus clouds which have originated from stratus clouds are referred to as stratus fractus. Under certain conditions a fractus cloud might merge with another cloud, or develop into a cumulus cloud, but usually a fractus cloud seen by itself will dissipate rapidly.

They are often observed on the leading and trailing edges of storm clouds, and are a display of wind activity.

Next Topic: Freezing Rain

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