Forecast Details for Portland, OR

Recent Locations: Portland, OR  
Overnight: Showers likely, mainly after 5am. Cloudy, with a low around 49. South southwest wind around 10 mph. Chance of precipitation is 70%.
Friday: Showers. High near 57. South wind 8 to 11 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 48. South southwest wind 6 to 10 mph. Chance of precipitation is 70%.
Saturday: Rain, mainly after 11am. High near 57. South southwest wind 9 to 11 mph. Chance of precipitation is 80%.
Saturday Night: Showers, mainly before 11pm. Low around 49. South southwest wind 9 to 11 mph. Chance of precipitation is 80%.
Sunday: Showers, mainly between 11am and 2pm, then rain after 2pm. High near 60. Chance of precipitation is 80%.
Sunday Night: Rain before 11pm, then showers after 11pm. Low around 43. Chance of precipitation is 80%.
Monday: Showers likely, then showers and possibly a thunderstorm after 11am. Mostly cloudy, with a high near 58.
Monday Night: Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Mostly cloudy, with a low around 42.
Tuesday: A chance of showers, with thunderstorms also possible after 11am. Partly sunny, with a high near 61.
Tuesday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 43.
Wednesday: A chance of showers. Mostly cloudy, with a high near 68.
Wednesday Night: A chance of rain. Mostly cloudy, with a low around 47.
Thursday: Rain likely. Partly sunny, with a high near 63.

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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

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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 are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Cumulus Clouds Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle

Weather Topic: What is Evaporation?

Home - Education - Precipitation - Evaporation

Evaporation Next Topic: Fog

Evaporation is the process which returns water from the earth back to the atmosphere, and is another crucial process in the water cycle.

Evaporation is the transformation of liquid into gas, and it happens because molecules are excited by the application of energy and turn into vapor. In order for water to evaporate it has to be on the surface of a body of water.

Next Topic: Fog