Weather Alert in Oregon
Flash Flood Watch issued September 10 at 12:19PM PDT until September 11 at 2:00AM PDT by NWS Boise ID
AREAS AFFECTED: Harney County; Baker County; Malheur County; Oregon Lower Treasure Valley
DESCRIPTION: * WHAT...Flash flooding caused by excessive rainfall is possible especially across the Falls, Cow Valley and Durkee burn scars. * WHERE...Portions of northeast and southeast Oregon, including the following areas, in northeast Oregon, Baker County. In southeast Oregon, Harney County, Malheur County and Oregon Lower Treasure Valley. * WHEN...Through late tonight. * IMPACTS...Heavy rainfall could trigger flash flooding or debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - https://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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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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