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wwus76 kotx 171742
npwotx
500
urgent - weather message
national weather service spokane wa
942 am pst wed dec 17 2014
..light winds and inversions will persist through much of the
workweek. this will lead toward stagnant air conditions over much
of central and northeast washington.
waz034-035-037-038-041>044-181745-
/o.con.kotx.as.y.0004.000000t0000z-141219t2000z/
moses lake area-upper columbia basin-northeast mountains-
okanogan highlands-wenatchee area-east slopes northern cascades-
okanogan valley-waterville plateau-
942 am pst wed dec 17 2014
...air stagnation advisory remains in effect until noon pst
friday...
* air quality...light winds and stable conditions will increase
the potential for build up of pollutants near the surface.
* timing...high pressure will persist through friday morning.
* impacts...prolonged periods of stagnant air can lock fine
particulate matter close to the ground and degrade air quality.
precautionary/preparedness actions...
an air stagnation advisory indicates that due to limited movement
of an air mass across the advisory area...pollution has the
potential to increase to dangerous levels. persons with
respiratory illness should follow their physicians advice for
dealing with high levels of air pollution.
&&
$$
wwus76 kpdt 180540
npwpdt
orz507-508-waz029-181445-
/o.con.kpdt.fg.y.0014.000000t0000z-141218t1800z/
foothills of the northern blue mountains of oregon-
foothills of the southern blue mountains of oregon-
foothills of the blue mountains of washington-
including the cities of...pendleton...pilot rock...heppner...
condon...fossil...dayton...waitsburg...walla walla
940 pm pst wed dec 17 2014
...dense fog advisory remains in effect until 10 am pst
thursday...
a dense fog advisory remains in effect until 10 am pst thursday.
* timing: widespread dense fog has developed across the blue
mountain foothills. rain showers overnight may briefly improve
visibilities.
* visibility: one quarter of a mile or less at times.
* impacts: motorists will have to use caution as visibilities
will change suddenly. roadways may become slick in areas
where temperatures fall to around freezing.
precautionary/preparedness actions...
a dense fog advisory means visibilities will frequently be
reduced to less than one quarter mile. if driving...slow down...
use your headlights...and leave plenty of distance ahead of you.
&&
$$
wwus76 kpdt 180540
npwpdt
waz027-028-181445-
/o.con.kpdt.as.y.0004.000000t0000z-141219t1800z/
yakima valley-lower columbia basin of washington-
including the cities of...naches...sunnyside...toppenish...
yakima...connell...prosser...tri-cities
940 pm pst wed dec 17 2014
...air stagnation advisory remains in effect until 10 am pst
friday...
an air stagnation advisory remains in effect until 10 am pst
friday.
* timing: through at least midday friday.
* locations: valleys in and around the lower columbia basin of
washington including the yakima valley.
* impacts: pollutants trapped near the surface can negatively
affect those with respiratory conditions.
precautionary/preparedness actions...
an air stagnation advisory indicates that due to limited movement
of an air mass across the advisory area...pollution will
increase. check with your local air quality agency for possible
restrictions in your area. for additional weather information...
check our website at www.weather.gov/pendleton.
&&
$$

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