Weather Alert in Oregon
Hydrologic Outlook issued March 12 at 2:09PM PDT by NWS Pendleton OR
AREAS AFFECTED: Wallowa County; Northern Blue Mountains of Oregon; Foothills of the Northern Blue Mountains of Oregon; Foothills of the Blue Mountains of Washington; Simcoe Highlands; Upper Slopes of the Eastern Washington Cascades Crest; Lower Slopes of the Eastern Washington Cascades Crest
DESCRIPTION: ESFPDT Heavy rain and mountain snow through Friday evening followed by unusually warm temperatures this weekend will lead to high water levels on many mountain streams and rivers. Currently the Grande Ronde River at Troy, the Umatilla River at Gibbon, the Walla Walla River at Touchet, The Klickitat River near Pitt and the Naches River at Naches are all forecast to reach Action Stage by Friday evening and continue into the weekend before receding in the late weekend or early next week. At this time, these locations are not expected to reach minor flood stage. Other streams and rivers will have rises but remain within their banks. There is some uncertainty in the rain and snow amounts through tomorrow and temperatures this weekend but confidence in river levels is good (60-80%). Additionally, water temperatures have dropped to the lower 40s, so the chances of hypothermia will be increased for anyone falling into rivers or streams.
INSTRUCTION: N/A
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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