Weather Alerts for Oregon

Recent Locations: Pine Level, AL Norcross, GA Crabtree, OR

1. Dense Fog Advisory for: Clatsop County Coast; Tillamook County Coast; Central Coast of Oregon; South Washington Coast

2. Heat Advisory for: Oregon Lower Treasure Valley

3. Red Flag Warning for: John Day Valley; Southern Blue Mountains; Central Mountains of Oregon; Warm Springs Reservation; Northern Deschutes National Forest; Southern Deschutes National Forest

4. Red Flag Warning for: Klamath Basin and the Fremont-Winema National Forest

5. Red Flag Warning for: Lower Columbia Basin of Oregon; Canyon Grassland of Wallowa County; Eastern Columbia River Gorge of Oregon; East Slopes of Mount Hood National Forest; Kittitas Valley; Lower Columbia Basin; Blue Mountains of Washington; Southeast Washington Grande Ronde Valley; Yakama Alpine District

6. Red Flag Warning for: Western Rogue Basin including the Illinois Valley; Eastern Rogue Valley

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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