Weather Alert in Oregon
Air Stagnation Advisory issued February 5 at 12:39PM PST until February 6 at 10:00PM PST by NWS Portland OR
AREAS AFFECTED: East Central Willamette Valley; Benton County Lowlands; Linn County Lowlands; Clackamas County Cascade Foothills; Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills; North Clark County Lowlands
DESCRIPTION: * WHAT...Light winds and limited air movement will lead to a period of stagnant air conditions. * WHERE...Foothills of the Northern and Central Oregon Cascades, East Central Willamette Valley, Benton County Lowlands, Linn County Lowlands, and North Clark County Lowlands. * WHEN...Until 10 PM PST Friday. * IMPACTS...Deteriorating air quality may cause issues for people with respiratory problems.
INSTRUCTION: State air quality agencies highly recommend that no outdoor burning occur and that residential wood burning devices be limited as much as possible. According to state air quality agencies, prolonged periods of stagnant air can hold pollutants close to the ground where people live and breathe. Check with your local burn agency for any current restrictions in your area. People with respiratory illness should follow their physician's advice for dealing with high levels of air pollution during periods of stagnant air, especially if an Air Quality Alert is in effect for your area. To see if an Air Quality Alert is in effect for your area, go to www.weather.gov/pqr and left-click your location on the homepage map display. Alternatively, you could also type your location into the search bar found on the top-left hand side of the homepage. From there, you will see an Air Quality Alert listed at the top if one is in effect for your location; you can click the alert to read more details if applicable.
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Weather Topic: What is Evaporation?
Home - Education - Precipitation - Evaporation
Next Topic: Fog
Evaporation is the process which returns water from the earth
back to the atmosphere, and is another crucial process in the water cycle.
Evaporation is the transformation of liquid into gas, and it happens because
molecules are excited by the application of energy and turn into vapor.
In order for water to evaporate it has to be on the surface of a body of water.
Next Topic: Fog
Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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