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 are Cumulonimbus Clouds?
Home - Education - Cloud Types - Cumulonimbus Clouds
Next Topic: Cumulus Clouds
The final form taken by a growing cumulus cloud is the
cumulonimbus cloud, which is very tall and dense.
The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although
most commonly they stop growing at an altitude of 6 km.
Even small cumulonimbus clouds appear very large in comparison to other cloud types.
They can signal the approach of stormy weather, such as thunderstorms or blizzards.
Next Topic: Cumulus Clouds
Weather Topic: What is Drizzle?
Home - Education - Precipitation - Drizzle
Next Topic: Evaporation
Drizzle is precipitation in the form of water droplets which are
smaller than raindrops.
Drizzle is characterized by fine, gently falling droplets and typically does not
impact human habitation in a negative way. The exception to this is freezing drizzle,
a condition where drizzle freezes immediately upon reaching earth's surface.
Freezing drizzle is still less dangerous than freezing rain, but can
potentially result in hazardous road conditions.
Next Topic: Evaporation
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