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2 products issued by NWS for:

Air Stagnation Advisory

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE PENDLETON OR
351 PM PST THU DEC 18 2014

...STAGNANT CONDITIONS TO CONTINUE THROUGH FRIDAY MORNING...

.INVERSIONS WILL CONTINUE TO PRODUCE LOW CLOUDS AND PATCHY FOG
OVER THE COLUMBIA BASIN INTO FRIDAY MORNING.

WAZ026>028-191800-
/O.CON.KPDT.AS.Y.0004.000000T0000Z-141219T1800Z/
KITTITAS VALLEY-YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
INCLUDING THE CITIES OF...ELLENSBURG...THORP...NACHES...
SUNNYSIDE...TOPPENISH...YAKIMA...CONNELL...PROSSER...TRI-CITIES
351 PM PST THU DEC 18 2014

...AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
FRIDAY...

AN AIR STAGNATION ADVISORY REMAINS IN EFFECT UNTIL 10 AM PST
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.

&&

$$






Hydrologic Outlook

HYDROLOGIC OUTLOOK
ORZ041-044-049-050-502-503-505>511-WAZ024-026>030-520-521-192300-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
1027 PM PST THU DEC 18 2014

...HEAVY RAIN EXPECTED OVER THE MOUNTAINS THIS WEEKEND WITH
RISING RIVER LEVELS...

A STORM SYSTEM WILL MOVE THROUGH THE PACIFIC NORTHWEST THIS
WEEKEND WITH HEAVY RAIN EXPECTED LATE SATURDAY THROUGH SUNDAY.

THE HEAVIEST RAIN IS EXPECTED ALONG THE CENTRAL AND NORTHERN
OREGON CASCADES WHERE RAIN AMOUNTS OF 5 TO 8 INCHES ARE POSSIBLE
ALONG THE CASCADE CREST. THE SNOW LEVEL WILL BE NEAR 4000 FEET ON
SATURDAY AND RISE TO NEAR 8000 FEET ON SUNDAY.

ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES...PRECIPITATION
AMOUNTS OF 4 TO 6 INCHES ARE POSSIBLE NEAR THE CREST. THE SNOW LEVEL
WILL BE AROUND 3000 FEET ON SATURDAY AND THEN RISE TO NEAR 6500
FEET BY SUNDAY AFTERNOON.

OVER THE BLUE MOUNTAINS...PRECIPITATION AMOUNTS OF 2 TO 3 INCHES
ARE POSSIBLE. THE SNOW LEVEL WILL BE AROUND 3000 FEET SATURDAY AND
RISE TO NEAR 8000 FEET ON SUNDAY.

SMALLER STREAMS AND CREEKS ARE EXPECTED TO START RISING SATURDAY
WITH THE LARGE RIVERS SEEING SUBSTANTIAL RISES SATURDAY NIGHT AND
SUNDAY. NO FLOODING IS EXPECTED ALONG THE LARGE RIVERS AT THIS
TIME...BUT SMALLER STREAMS AND CREEKS MAY SEE FLOODING SATURDAY
NIGHT AND SUNDAY.

MONITOR RIVER LEVELS AT WWW.WEATHER.GOV/PENDLETON.

$$








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