Weather Alert in Oregon
Special Weather Statement issued February 5 at 12:28PM PST by NWS Pendleton OR
AREAS AFFECTED: Northern Blue Mountains of Oregon; Foothills of the Northern Blue Mountains of Oregon; Foothills of the Southern Blue Mountains of Oregon; North Central Oregon; Central Oregon; Lower Columbia Basin of Washington; Foothills of the Blue Mountains of Washington
DESCRIPTION: Areas of dense fog reducing visibility as low as one quarter mile will persist across many areas especially above about 2000 ft through the duration of the afternoon and into the evening. By the evening and overnight, many of these areas of dense fog will expand to lower elevations, becoming more widespread, especially for areas along the foothills of the Blue Mountains. Motorists should be prepared for dense fog expanding overnight, potentially creating a travel hazard well into the late morning on Friday.
INSTRUCTION: N/A
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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
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - 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
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