736
AUUS46 KPDT 171225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN MAY 17 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 8-16 MPH. N 6-11 MPH.
TRANSPORT WINDS SW 8-15 MPH. N 11-15 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON MAY 18 FAIR.
OUTLOOK FOR TUE MAY 19 GOOD.
VENTILATION INDEX (CATEGORY) 176 (POOR). 779 (GOOD).
OUTLOOK FOR MON MAY 18 526 (FAIR).
OUTLOOK FOR TUE MAY 19 711 (GOOD).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 6-11 MPH. N 6-9 MPH.
TRANSPORT WINDS NW 7-12 MPH. N 11-13 MPH.
MIXING HEIGHT NEAR SURFACE. 10000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON MAY 18 FAIR.
OUTLOOK FOR TUE MAY 19 FAIR.
VENTILATION INDEX (CATEGORY) 185 (POOR). 939 (GOOD).
OUTLOOK FOR MON MAY 18 410 (FAIR).
OUTLOOK FOR TUE MAY 19 414 (FAIR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS NW 6-12 MPH. N 14-23 MPH.
TRANSPORT WINDS NW 9-13 MPH. N 19-22 MPH.
MIXING HEIGHT 4000 FT MSL. 8000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON MAY 18 GOOD.
OUTLOOK FOR TUE MAY 19 GOOD.
VENTILATION INDEX (CATEGORY) 210 (POOR). 885 (GOOD).
OUTLOOK FOR MON MAY 18 654 (GOOD).
OUTLOOK FOR TUE MAY 19 632 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 8-15 MPH. N 6-11 MPH.
TRANSPORT WINDS SW 10-15 MPH. N 11-18 MPH.
MIXING HEIGHT NEAR SURFACE. 7000 FT MSL.
DISPERSION CATEGORY FAIR. GOOD.
OUTLOOK FOR MON MAY 18 FAIR.
OUTLOOK FOR TUE MAY 19 GOOD.
VENTILATION INDEX (CATEGORY) 177 (POOR). 596 (FAIR).
OUTLOOK FOR MON MAY 18 493 (FAIR).
OUTLOOK FOR TUE MAY 19 702 (GOOD).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 479 (FAIR)
ELLENSBURG 940 (GOOD)
GOLDENDALE 676 (GOOD)
TRI-CITIES 906 (GOOD)
WALLA WALLA 419 (FAIR)
YAKIMA 874 (GOOD)
BEND 1050 (GOOD)
PRINEVILLE 1050 (GOOD)
ENTERPRISE 555 (FAIR)
HERMISTON 827 (GOOD)
JOHN DAY 1050 (GOOD)
LA GRANDE 887 (GOOD)
MADRAS 934 (GOOD)
MEACHAM 635 (GOOD)
PENDLETON 847 (GOOD)
REDMOND 1045 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 703 (GOOD)
METEOROLOGICAL INFORMATION PROVIDED IN THIS PRODUCT REPRESENTS ONLY
SOME OF THE FACTORS USED IN BURN DECISIONS. BURN DECISIONS ARE
OUTSIDE THE PURVIEW OF THE NATIONAL WEATHER SERVICE.
THE VENTILATION INDEX IS A TOOL TO ASSIST SMOKE MANAGEMENT
AGENCIES IN DETERMINING BURN OR NO BURN DECISIONS. A VENTILATION
INDEX GRAPHIC IS ON THE PENDLETON WEBSITE AT THE FOLLOWING ADDRESS:
HTTPS://WWW.WEATHER.GOV/PDT/DSSBRIEFING
IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
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