Weather Alert in Oregon
Red Flag Warning issued August 23 at 5:38PM PDT until August 25 at 9:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Central Mountains of Oregon; Northern Deschutes National Forest
DESCRIPTION: ...HOT, DRY, AND UNSTABLE CONDITIONS EXPECTED IN CENTRAL OREGON OVER THE NEXT TWO DAYS... .Hot conditions, combined with low relative humidities and an unstable air mass, have the potential to create significant, plume-dominated fire growth in the area surrounding the Flat Fire. Unstable conditions will relent overnight, however relative humidity recoveries are expected to be poor. The National Weather Service in Pendleton has issued a Red Flag Warning for hot, dry, and unstable conditions, which is in effect from noon Sunday to 9 PM PDT Monday. * AFFECTED AREA...Eastern portion of Fire Weather Zones 700 Central Mountains of Oregon and western portion of 704 Northern Deschutes National Forest, primarily including areas around the Flat Fire. * TIMING...From noon Sunday to 9 PM PDT Monday. * MIXING HEIGHT...As high as 8,000 ft AGL Sunday and 11,500 ft AGL Monday. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...A dry and unstable air mass with warm temperatures can contribute to active fire behavior.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior.
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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