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2 products issued by NWS for: Salem OR
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Air Stagnation Advisory

URGENT - WEATHER MESSAGE
National Weather Service Portland OR
151 PM PST Thu Dec 14 2017

...STAGNANT AIR CONDITIONS CONTINUE IN THE CENTRAL AND SOUTHERN
WILLAMETTE VALLEY THROUGH EARLY FRIDAY...

ORZ007-008-151800-
/O.CON.KPQR.AS.Y.0002.000000T0000Z-171215T1800Z/
Central Willamette Valley-South Willamette Valley-
Including the cities of Salem, McMinnville, Woodburn, Stayton,
Dallas, Eugene, Springfield, Corvallis, Albany, and Lebanon
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.

&&

$$



Special Weather Statement

Special Weather Statement
National Weather Service Portland OR
336 AM PST Fri Dec 15 2017

ORZ003-005>008-010-011-014>016-WAZ019-020-022-039-040-045-046-
151900-
Coast Range of Northwest Oregon-Lower Columbia-
Greater Portland Metro Area-Central Willamette Valley-
South Willamette Valley-Northern Oregon Cascade Foothills-
Northern Oregon Cascades-Upper Hood River Valley-
Western Columbia River Gorge-Central Columbia River Gorge-
South Washington Cascades-Willapa Hills-I-
5 Corridor in Cowlitz County-Greater Vancouver Area-
South Washington Cascade Foothills-
Including the cities of Vernonia, Jewell, Sunset Summit,
Lees Camp, Trask, St. Helens, Clatskanie, Hillsboro, Portland,
Wilsonville, Oregon City, Gresham, Troutdale, Salem, McMinnville,
Woodburn, Stayton, Dallas, Eugene, Springfield, Corvallis,
Albany, Lebanon, Sandy, Estacada, Silver Falls State Park,
Sweet Home, Government Camp, Detroit, Santiam Pass, Parkdale,
Odell, Corbett, Rooster Rock, Multnomah Falls, Cascade Locks,
Hood River, Coldwater Ridge Visitors Center, Mount St. Helens,
Wind River Valley, Willapa, Frances, Elk Mountain, Ryderwood,
Longview, Kelso, Castle Rock, Vancouver, Battle Ground,
Ridgefield, Washougal, Yacolt, Amboy, Toutle, Ariel, Lake Merwin,
Yale Lake, Cougar, North Bonneville, Stevenson, Carson,
and Underwood
336 AM PST Fri Dec 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.



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