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Oregon, Central Willamette Valley

Special Statement, Air Stagnation Advisory

Statement as of 3:36 AM PST on December 15, 2017

Expires 1:00 PM EST on December 15, 2017


... Patchy light freezing rain possible this morning...

A front offshore will push increasing rain into the region later
this morning. At 3 am, temperatures in many lowland areas were in
the upper 20s to lower 30s. Temperatures will rise this morning.

But, there is a chance that temperatures may not warm above
freezing before the rain begins. This would result in patchy
light freezing rain. Since rainfall will be light, little if any
ice accumulation is expected.

Threat of the freezing rain will be 5 am and 8 am for valleys in
the Coast Range and Willapa Hills, and from 8 to 10 am for the
Willamette Valley and Clark County.

Again, most areas will not see the freezing rain, as will be
quite patchy and short-lived.

Threat of patchy freezing rain may last until 1 PM for valleys in
the South Washington Cascades, far north Oregon Cascades and Upper
Hood River Valley.

Motorist driving about this morning should be prepared for locally
icy conditions.



Rockey.

151 PM PST Thu Dec 14 2017

... Air stagnation advisory remains in effect until 10 am PST
Friday...

* air quality... air quality may remain diminished due to an
extended period of stagnant air conditions.

* Timing... through early Friday morning.

* Locations... the southern Willamette Valley.

* Impacts... limited ventilation may result in deteriorating air
quality continuing through early Friday.

Precautionary/preparedness actions...

An air stagnation advisory indicates that due to limited movement
of an air mass across the advisory area, pollution will increase
to dangerous levels. Persons with respiratory illness should
follow their physicians advice for dealing with high levels of
air pollution.




Weather Severe Map
Alaska - Winter Weather Advisory , Winter Storm Warning , Record Report
Arizona - Record Report
California - High Surf Advisory , Wind Advisory , Fire Weather Watch, Fire Weather Warning , Fire Weather Warning , Fire Weather Warning, Fire Weather Watch , Air Quality Alert , Record Report , Public Information Statement , Public Information Statement
Colorado - Public Information Statement , Public Information Statement
Connecticut - Special Statement
Delaware - Winter Weather Advisory
District of Columbia - Winter Weather Advisory
Florida - Coastal Hazard Statement
Hawaii - High Surf Advisory , Wind Advisory
Idaho - Winter Weather Advisory , Dense Fog Advisory , Air Stagnation Advisory , Special Statement , Air Quality Alert
Illinois -
Indiana -
Kansas - Public Information Statement , Public Information Statement
Louisiana - Storm Surge Warning, Tropical Storm Warning
Maine - Public Information Statement
Maryland - Winter Weather Advisory
Massachusetts - Special Statement
Michigan - Flood Warning , Flood Advisory , Winter Weather Advisory , Special Statement , Record Report
Missouri -
Montana - Wind Advisory , Winter Weather Advisory , Special Statement
Nebraska - Record Report
Nevada -
New Jersey - Winter Weather Advisory , Special Statement
New Mexico -
New York - Winter Weather Advisory , Lake Effect Snow Warning , Special Statement , Public Information Statement , Public Information Statement
Oregon - Winter Weather Advisory , Special Statement, Air Stagnation Advisory , Air Stagnation Advisory , Air Quality Alert , Special Statement
Pennsylvania - Winter Weather Advisory , Special Statement
Puerto Rico - Coastal Hazard Statement
Rhode Island - Special Statement
Texas - Tropical Storm Warning , Storm Surge Watch, Tropical Storm Warning , High Wind Advisory
Utah - Record Report
Virgin Islands - Coastal Hazard Statement
Virginia - Winter Weather Advisory
Washington - Winter Weather Advisory , Air Stagnation Advisory , Special Statement
Wisconsin - Flood Warning
Wyoming - High Wind Warning , Special Statement

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