Forecast Details for Portland, OR

Recent Locations: Portland, OR  
This Afternoon: Sunny, with a high near 76. Northeast wind around 6 mph becoming northwest.
Tonight: Increasing clouds, with a low around 46. Northwest wind 5 to 7 mph becoming calm after midnight.
Wednesday: Partly sunny, with a high near 67. Calm wind becoming west 5 to 7 mph in the afternoon.
Wednesday Night: Mostly cloudy, with a low around 49. West northwest wind around 6 mph becoming light and variable in the evening.
Thursday: Rain. High near 56. South wind 6 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night: Rain. Low around 50. Chance of precipitation is 100%.
Friday: Showers. High near 57. Chance of precipitation is 100%.
Friday Night: Showers likely, mainly before 11pm. Mostly cloudy, with a low around 47.
Saturday: Showers likely, mainly after 11am. Mostly cloudy, with a high near 59.
Saturday Night: Showers likely, mainly before 11pm. Mostly cloudy, with a low around 47.
Sunday: Showers. Mostly cloudy, with a high near 58.
Sunday Night: Showers likely. Mostly cloudy, with a low around 45.
Monday: Showers. Mostly cloudy, with a high near 58.

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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

The Current National Weather Forecast and National Weather Map are shown below.

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 are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds