Weather Alert in Oregon
Fire Weather Watch issued July 28 at 9:46PM PDT until July 31 at 11:00AM PDT by NWS Pendleton OR
AREAS AFFECTED: Central Mountains of Oregon; Southern Deschutes National Forest
DESCRIPTION: ...RED FLAG WARNING IN EFFECT FROM 2 PM TO 11 PM PDT TUESDAY FOR ABUNDANT LIGHTNING... ...FIRE WEATHER WATCH IN EFFECT FROM TUESDAY AFTERNOON THROUGH TUESDAY EVENING FOR ABUNDANT LIGHTNING... .Elevated fire weather concerns due to thunderstorms and continued hot and dry conditions through midweek. While these storms may produce wetting rains, there is still high confidence in the probability of isolated dry thunderstorms embedded both Tuesday and Wednesday. Daytime RHs will be in the teens to low 20s. Gusty and erratic winds can occur around thunderstorms with gusts up to 45-60 mph. The National Weather Service in Pendleton has issued a Fire Weather Watch for abundant lightning, which is in effect from Wednesday afternoon through Thursday morning. * AFFECTED AREA...Fire Weather Zones 700 Central Mountains of Oregon and 705 Southern Deschutes National Forest. * TIMING...For the Red Flag Warning, from 2 PM to 11 PM PDT Tuesday. For the Fire Weather Watch, from Wednesday afternoon through Thursday morning. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * THUNDERSTORMS...Scattered coverage with abundant lightning as well as 10-40% chances of dry isolated storms embedded. * OUTFLOW WINDS...Gusty erratic winds up to 45-60 mph.
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. 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 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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