Weather Alert in Oregon
Special Weather Statement issued February 10 at 1:50AM PST by NWS Portland OR
AREAS AFFECTED: Inner Portland Metro; Inner Vancouver Metro
DESCRIPTION: Patchy dense fog limiting visibility to one mile or less has developed across western portions of the Portland/Vancouver metro this morning. Eastern portions of the metro including Gresham, Troutdale, Fairview, Camas, and Washougal are less likely to see travel impacts from reduced visibility. Fog may not be uniformly dense and commuters should expect rapid changes in visibility on area roadways. Dense fog is most likely to occur in areas sheltered from winds as well as areas near waterways including lakes and rivers. Locales less sheltered from winds may instead see low overcast skies where only hilltops experience reduced visibility. Drivers should slow down and leave plenty of following distance. Pedestrians and cyclists should wear bright or reflective clothing to increase the chances of being seen by others in poor visibility conditions.
INSTRUCTION: N/A
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Weather Topic: What is Freezing Rain?
Home - Education - Precipitation - Freezing Rain
Next Topic: Graupel
Freezing rain is a condition where precipitation which has fallen in the form of
water droplets reaches temperatures which are below freezing and freezes upon
coming into contact
with surface objects. The result of this precipitation is a glaze of ice which
can be damaging to plants and man-made structures. A severe onset of freezing
rain which results in a very thick glaze of ice is known as an ice storm.
Next Topic: Graupel
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
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