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 Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds
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