Weather Alerts for Oregon

Recent Locations: Decatur, IN Spring Valley, WI Helix, OR

1. Freeze Warning for: Eastern Curry County and Josephine County; Jackson County

2. Freeze Watch for: Benton County Lowlands; Linn County Lowlands; Lane County Lowlands; Upper Hood River Valley; Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills

3. Frost Advisory for: Central Douglas County

4. Frost Advisory for: North Oregon Coast Range Lowlands; Central Oregon Coast Range Lowlands; North Oregon Coast Range; Central Oregon Coast Range; Lower Columbia River; Tualatin Valley; West Hills and Chehalem Mountains; Outer Southeast Portland Metro; West Central Willamette Valley; East Central Willamette Valley; West Columbia River Gorge of Oregon above 500 ft; Clackamas County Cascade Foothills; Willapa Hills; Cowlitz County Lowlands; North Clark County Lowlands; South Washington Cascade Foothills

5. Frost Advisory for: South Central Oregon Coast

6. Winter Storm Warning for: Cascades of Marion and Linn Counties; Cascades of Lane County

7. Winter Storm Warning for: East Slopes of the Oregon Cascades

8. Winter Storm Warning for: Eastern Douglas County Foothills; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades

9. Winter Weather Advisory for: Klamath Basin; Northern and Eastern Klamath County and Western Lake County

10. Winter Weather Advisory for: North Oregon Cascades; South Washington Cascades

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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).

National Weather Forecast--Current

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

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 Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain