Weather Alert in Oregon
Wind Advisory issued February 20 at 9:42PM PST until February 21 at 10:00PM PST by NWS Pendleton OR
AREAS AFFECTED: Grande Ronde Valley
DESCRIPTION: * WHAT...For the Wind Advisory, south winds 25 to 35 mph with gusts up to 45 mph expected. For the High Wind Watch, south winds 30 to 40 mph with gusts up to 60 mph possible. * WHERE...Grande Ronde Valley. * WHEN...For the Wind Advisory, from 4 AM to 10 PM PST Saturday. For the High Wind Watch, from Saturday evening through Sunday evening. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. * ADDITIONAL DETAILS...Strongest winds are expected at the southern end of the Grande Ronde Valley, especially in the vicinity of Ladd and Pyles canyons.
INSTRUCTION: Monitor the latest forecasts and warnings for updates. Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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