Weather Alert in Oregon

Recent Locations: Lancaster, CA Eugene, OR Portland, OR

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 Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds