Forecast Details for Portland, OR

Recent Locations: West Covina, CA Laredo, TX Portland, OR

Tonight: Increasing clouds, with a low around 37. North wind around 5 mph becoming calm in the evening.

Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 53. Light south wind.

Thursday Night: Increasing clouds, with a low around 37. Calm wind.

Friday: Showers, mainly after 4pm. High near 49. Calm wind becoming south southwest around 5 mph in the afternoon. Chance of precipitation is 80%.

Friday Night: Showers. Low around 41. Light south wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday: Showers likely. Mostly cloudy, with a high near 48. Chance of precipitation is 60%.

Saturday Night: A 40 percent chance of rain. Mostly cloudy, with a low around 38.

Sunday: A slight chance of rain. Mostly cloudy, with a high near 50.

Sunday Night: A slight chance of rain after 4am. Partly cloudy, with a low around 35.

Washington's Birthday: A slight chance of rain and snow before 10am, then rain likely. Snow level 2200 feet. Partly sunny, with a high near 48.

Monday Night: Rain likely. Snow level 2300 feet. Mostly cloudy, with a low around 37.

Tuesday: Rain likely. Snow level 1800 feet. Mostly cloudy, with a high near 48.

Tuesday Night: A chance of rain. Snow level 2000 feet. Mostly cloudy, with a low around 37.

Wednesday: Rain likely. Snow level 1700 feet rising to 2300 feet in the afternoon. Mostly cloudy, with a high near 50.

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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 Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds