Weather Alert in Washington
Red Flag Warning issued July 1 at 2:23PM PDT until July 2 at 9:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Lower Columbia Basin
DESCRIPTION: ...DRY THUNDERSTORMS EXPECTED FOR CENTRAL OREGON TODAY, FOLLOWED BY DRY AND WINDY CONDITIONS ACROSS THE COLUMBIA BASIN AND THROUGH THE KITTITAS VALLEY WEDNESDAY... .A ridge of high pressure overhead is inducing hot and dry conditions across the region. Dry thunderstorms have already initiated this afternoon across central Oregon. The ridge of high pressure is anticipated to break down further on Wednesday, with west winds picking up through the Cascade gaps. With RHs having little time to recover from the heat, this will lead to critical fire weather conditions across the Kittitas Valley and into the Columbia Basin. The National Weather Service in Pendleton has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 2 PM to 9 PM PDT Wednesday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 691 Lower Columbia Basin of Washington. * TIMING...From 2 PM to 9 PM PDT Wednesday. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * WINDS...West 15 to 25 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 percent.
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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