Weather Alert in Oregon
Fire Weather Watch issued September 2 at 3:55AM PDT until September 3 at 9:00PM PDT by NWS Portland OR
AREAS AFFECTED: Mt. Hood National Forest Region; Southern Gifford Pinchot National Forest; Mt. Adams Ranger District of the Gifford-Pinchot National Forest
DESCRIPTION: The National Weather Service in Portland has issued a Fire Weather Watch for thunderstorms, which is in effect from Wednesday afternoon through Wednesday evening. * AFFECTED AREA...In Oregon, Fire Weather Zone 688 Mt. Hood National Forest Region. In Washington, Fire Weather Zone 634 Southern Gifford Pinchot National Forest and Fire Weather Zone 635 Mt. Adams Ranger District of the Gifford Pinchot National Forest. * THUNDERSTORMS...A 10-25% chance of thunderstorms. Storms may produce very little rainfall, increasing the risk of new fire starts from dry lightning. * OUTFLOW WINDS...Instantaneous gusts as high as 40 mph. Gusts at these speeds can be observed tens of miles away from the core of the thunderstorm. * DRY AND UNSTABLE...Unstable conditions with elevated mixing heights may promote pyroconvective activity over ongoing fires. * IMPACTS...Conditions may be favorable for rapid fire spread which may threaten life and property. Thunderstorm outflow winds may result in unanticipated erratic fire spread. High instability may result in fire growth. Frequent lightning and critically dry fuels may result in new fire starts.
INSTRUCTION: 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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