943  
WWUS76 KPDT 231645  
NPWPDT  
 
URGENT - WEATHER MESSAGE  
NATIONAL WEATHER SERVICE PENDLETON OR  
945 AM PDT TUE OCT 23 2018  
   
..AIR STAGNATION DECREASES TODAY
 
 
.TODAY MARKS THE BEGINNING OF IMPROVING AIR VENTILATION AND  
QUALITY OVER THE INLAND PACIFIC NORTHWEST.  
 
ORZ041-044-049-050-502-503-505>511-WAZ024-026>030-520-521-231745-  
/O.EXP.KPDT.AS.Y.0001.000000T0000Z-181023T1700Z/  
EAST COLUMBIA RIVER GORGE-LOWER COLUMBIA BASIN OF OREGON-  
GRANDE RONDE VALLEY-WALLOWA COUNTY-  
NORTHERN BLUE MOUNTAINS OF OREGON-  
SOUTHERN BLUE MOUNTAINS OF OREGON-JOHN DAY BASIN-OCHOCO-  
JOHN DAY HIGHLANDS-  
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-  
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-  
EAST SLOPES OF THE OREGON CASCADES-NORTH CENTRAL OREGON-  
CENTRAL OREGON-EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-  
KITTITAS VALLEY-YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-  
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-  
NORTHWEST BLUE MOUNTAINS-EAST SLOPES OF THE WASHINGTON CASCADES-  
SIMCOE HIGHLANDS-  
INCLUDING THE CITIES OF ARLINGTON, THE DALLES, BOARDMAN,  
HERMISTON, IONE, COVE, ELGIN, LA GRANDE, UNION, ENTERPRISE,  
JOSEPH, WALLOWA, MEACHAM, TOLLGATE, LONG CREEK, NORTH POWDER,  
UKIAH, DAYVILLE, JOHN DAY, MITCHELL, MONUMENT, SPRAY, BROTHERS,  
PAULINA, PRAIRIE CITY, SENECA, ATHENA, PENDLETON, PILOT ROCK,  
HEPPNER, CONDON, FOSSIL, CAMP SHERMAN, LA PINE, SISTERS,  
SUNRIVER, DUFUR, MAUPIN, MORO, BEND, MADRAS, PRINEVILLE, REDMOND,  
WHITE SALMON, ELLENSBURG, THORP, NACHES, SUNNYSIDE, TOPPENISH,  
YAKIMA, CONNELL, PROSSER, TRI-CITIES, DAYTON, WAITSBURG,  
WALLA WALLA, SKI BLUEWOOD RESORT, APPLETON, CLE ELUM, CLIFFDELL,  
GOLDENDALE, AND BICKLETON  
945 AM PDT TUE OCT 23 2018  
 
...AIR STAGNATION ADVISORY WILL EXPIRE AT 10 AM PDT THIS  
MORNING...  
 
.THE PERSISTENT UPPER-LEVEL RIDGE THAT LED TO POOR AIR VENTILATION  
AND QUALITY IS BEGINNING TO SHIFT EAST AS A COOL FRONT PUSHES  
ACROSS THE REGION TODAY AND TOMORROW. A STRONGER COLD FRONT IS  
EXPECTED TO PUSH ACROSS THURSDAY INTO FRIDAY. EXPECT A SLIGHT  
IMPROVEMENT IN AIR QUALITY EACH DAY THROUGH FRIDAY WITH THE  
PASSING OF THE FRONTS.  
 

 
 
DS  
 
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