Weather Alert in Oregon
Fire Weather Watch issued July 29 at 2:22PM PDT until July 31 at 11:00AM PDT by NWS Portland OR
AREAS AFFECTED: Northern Willamette National Forest; Southern Willamette National Forest
DESCRIPTION: ...RED FLAG WARNING NOW IN EFFECT FROM 11 AM TO 11 PM PDT WEDNESDAY FOR THUNDERSTORMS FOR FIRE WEATHER ZONES 689 AND 690... ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM 11 PM PDT WEDNESDAY TO 11 AM PDT THURSDAY FOR THUNDERSTORMS FOR FIRE WEATHER ZONES 689 AND 690... ...15-35% CHANCE OF THUNDERSTORMS PRODUCING LIGHTNING WEDNESDAY THROUGH THURSDAY MORNING... ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM 11 PM PDT WEDNESDAY TO 11 AM PDT THURSDAY FOR THUNDERSTORMS FOR FIRE WEATHER ZONES 689 AND 690... The National Weather Service in Portland has issued a Red Flag Warning for thunderstorms, which is in effect from 11 AM to 11 PM PDT Wednesday. The previous Fire Weather Watch remains in effect from 11 PM PDT Wednesday to 11 AM PDT Thursday. * AFFECTED AREA...In Oregon, Fire Weather Zone 689 Northern Willamette National Forest and Fire Weather Zone 690 Southern Willamette National Forest. * OUTFLOW WINDS...Brief and highly localized outflow wind gusts up to 35 mph possible with any shower or thunderstorm that passes by. * IMPACTS...Thunderstorm outflow winds may result in erratic fire spread. Frequent lightning and critically dry fuels may result in numerous fire starts.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of the above conditions can contribute to extreme fire behavior. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
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Weather Topic: What are Altocumulus Clouds?
Home - Education - Cloud Types - Altocumulus Clouds
Next Topic: Altostratus Clouds
Similar to cirrocumulus clouds, altocumulus clouds are
characterized by cloud patches. They are distinguished by larger cloudlets
than cirrocumulus clouds but are still smaller than stratocumulus clouds.
Altocumulus clouds most commonly form in middle altitudes (between 2 and 5 km)
and may resemble, at times, the shape of a flying saucer.
These uncommon formations, called altocumulus lenticularis, are created by uplift
in the atmosphere and are most often seen in close proximity to mountains.
Next Topic: Altostratus Clouds
Weather Topic: What are Cirrocumulus Clouds?
Home - Education - Cloud Types - Cirrocumulus Clouds
Next Topic: Cirrostratus Clouds
Cirrocumulus clouds form at high altitudes (usually around 5 km)
and have distinguishing characteristics displayed in a fine layer of
small cloud patches. These small cloud patches are sometimes referred to as
"cloudlets" in relation to the whole cloud formation.
Cirrocumulus clouds are formed from ice crystals and water droplets. Often, the
water droplets in the cloud freeze into ice crystals and the cloud becomes a
cirrostratus cloud. Because of this common occurrence, cirrocumulus cloud
formations generally pass rapidly.
Next Topic: Cirrostratus Clouds
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