Weather Alert in Oregon
Dense Fog Advisory issued August 12 at 9:55PM PDT until August 13 at 11:00AM PDT by NWS Portland OR
AREAS AFFECTED: Clatsop County Coast; Tillamook County Coast; Central Coast of Oregon; South Washington Coast
DESCRIPTION: * WHAT...Visibility one quarter mile or less in dense fog. Beaches, headlands, and coastal areas will be most impacted. * WHERE...South Washington and North and Central Oregon Coast. * WHEN...From 1 AM to 11 AM PDT Wednesday. * IMPACTS...Low visibility could make driving conditions hazardous. * ADDITIONAL DETAILS...Fog and low stratus will be patchy along the north Oregon and south Washington Coast, but when it does form, it will be dense. Highest concentration of dense fog will be from Lincoln City south towards Florence. Areas from Cannon Beach north will see fog burn off the quickest in the morning.
INSTRUCTION: If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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