Weather Alert in Oregon
Dense Fog Advisory issued February 25 at 5:32AM PST until February 25 at 10:00AM PST by NWS Portland OR
AREAS AFFECTED: North Oregon Coast Range Lowlands; Lower Columbia River; Tualatin Valley; Inner Portland Metro; East Portland Metro; West Central Willamette Valley; East Central Willamette Valley; Cowlitz County Lowlands; North Clark County Lowlands; Inner Vancouver Metro; East Clark County Lowlands
DESCRIPTION: * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portland Metro Lowlands, Greater Vancouver Metro, Lower Columbia River and Cowlitz River Valleys, Central Willamette Valley, and North Oregon Coast Range Lowlands. * WHEN...Until 10 AM PST this morning. * IMPACTS...Low visibility could make driving conditions hazardous.
INSTRUCTION: If driving, slow down and leave plenty of distance ahead of you. Pedestrians and cyclists should wear bright or reflective clothing to increase the chances of being seen by others in poor visibility conditions.
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Weather Topic: What is Hail?
Home - Education - Precipitation - Hail
Next Topic: Hole Punch Clouds
Hail is a form of precipitation which is recognized by large solid balls or
clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind.
As the hailstones remain in the updraft, ice is deposited onto them until their
weight becomes heavy enough for them to fall to the earth's surface.
Hail storms can cause significant damage to crops, aircrafts, and man-made structures,
despite the fact that the duration is usually less than ten minutes.
Next Topic: Hole Punch Clouds
Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - 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
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