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 Cirrostratus Clouds?
Home - Education - Cloud Types - Cirrostratus Clouds
Next Topic: Cirrus Clouds
Cirrostratus clouds are high, thin clouds that form above
20,000 feet and are made mostly of ice crystals. They sometimes look like giant
feathers, horse tails, or curls of hair in the sky.
These clouds are pushed by the jet stream and can move at high speeds reaching
100 mph.
What do they indicate?
They indicate that a precipitation is likely within 24 hours.
Next Topic: Cirrus Clouds
Weather Topic: What is Condensation?
Home - Education - Precipitation - Condensation
Next Topic: Contrails
Condensation is the process which creates clouds, and therefore
it is a crucial process in the water cycle.
Condensation is the change of matter from a state of gas into a state of liquid,
and it happens because water molecules release heat into the atmosphere and
become organized into a more closely packed structure, what we might see as
water droplets.
Water is always present in the air around us as a vapor, but it's too small for
us to see. When water undergoes the process of condensation it becomes organized
into visible water droplets. You've probably seen condensation happen before on the
surface of a cold drink!
Next Topic: Contrails
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