Weather Alert in Oregon
Flood Advisory issued March 14 at 1:48PM PDT until March 15 at 12:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Umatilla, OR; Union, OR; Wallowa, OR; Columbia, WA; Walla Walla, WA
DESCRIPTION: * WHAT...Flooding caused by runoff and snowmelt continues. * WHERE...Portions of northeast Oregon, including the following counties, Umatilla, Union and Wallowa and southeast Washington, including the following counties, Columbia and Walla Walla. * WHEN...Until noon PDT Sunday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Overflowing poor drainage areas. River or stream flows are elevated. * ADDITIONAL DETAILS... - At 145 PM PDT, emergency management reported river flooding along area rivers and streams. Minor flooding is ongoing or is imminent. - Area rivers and streams is the most likely place to experience minor flooding. Flooding impacts will continue, but no additional rainfall is expected. - Some locations that will experience flooding include... Walla Walla, Pendleton, La Grande, Dayton, Meacham, College Place, Milton-Freewater, Waitsburg, Athena, Weston, Adams, Prescott, Helix, Starbuck, Bingham Springs, Tollgate, Spout Springs, Garrett, Gibbon and Dixie. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route.
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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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