Weather Alert in Oregon
Wind Advisory issued February 5 at 12:24AM PST until February 5 at 1:00PM PST by NWS Portland OR
AREAS AFFECTED: East Portland Metro; East Clark County Lowlands
DESCRIPTION: * WHAT...East winds 25 to 35 mph with gusts up to 40 to 45 mph expected. * WHERE...Eastern Portland/Vancouver Metro Near The Gorge. * WHEN...Until 1 PM PST this afternoon. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...The strongest wind gusts are expected to occur from Washougal and Troutdale eastward after 3 AM PST Thursday.
INSTRUCTION: Secure outdoor objects. Use extra caution when driving, especially if operating a high profile vehicle. Secure outdoor objects such as garbage cans and other objects that can easily blow around.
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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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