Weather Alerts for Oregon
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
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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 is Evaporation?
Home - Education - Precipitation - 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
Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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