Weather Alert in Oregon
Flood Watch issued March 11 at 11:24AM PDT until March 16 at 10:49PM PDT by NWS Portland OR
AREAS AFFECTED: East Central Willamette Valley
DESCRIPTION: ...The Flood Watch continues for the following rivers in Oregon... Johnson Creek at Sycamore affecting Inner Portland Metro zone. Pudding River at Aurora affecting East Central Willamette Valley zone. * WHAT...Flooding is possible. * WHERE...Pudding River at Aurora. * WHEN...From Saturday evening to late Monday evening. * IMPACTS...Above 22.0 feet, expect minor flooding of low-lying agricultural lands and access roads along the river. * ADDITIONAL DETAILS... - At 11:00 AM PDT Wednesday the stage was 10.0 feet. - Forecast...Flood stage may be reached Saturday evening. - Flood stage is 22.0 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: If you are in the watch area, remain alert to possible flooding. Additional information is available at www.weather.gov. The next statement will be issued late tonight at 200 AM PDT.
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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
Weather Topic: What are Cumulus Clouds?
Home - Education - Cloud Types - Cumulus Clouds
Next Topic: Drizzle
Cumulus clouds are fluffy and textured with rounded tops, and
may have flat bottoms. The border of a cumulus cloud
is clearly defined, and can have the appearance of cotton or cauliflower.
Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall,
becoming cumulus congestus and possibly the even taller cumulonimbus clouds.
When cumulus clouds become taller, they have a greater chance of producing precipitation.
Next Topic: Drizzle
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