794
AUUS46 KPDT 191225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT JUL 19 2025

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 11-22 MPH.       SW 14-20 MPH.
TRANSPORT WINDS               SW 13-23 MPH.       W 17-24 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN JUL 20        FAIR.
OUTLOOK FOR MON JUL 21        FAIR.

VENTILATION INDEX (CATEGORY)  277 (POOR).         948 (GOOD).
OUTLOOK FOR SUN JUL 20        506 (FAIR).
OUTLOOK FOR MON JUL 21        331 (FAIR).

FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 5-9 MPH.          W 6-11 MPH.
TRANSPORT WINDS               NW 6-11 MPH.        W 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN JUL 20        FAIR.
OUTLOOK FOR MON JUL 21        FAIR.

VENTILATION INDEX (CATEGORY)  126 (POOR).         608 (GOOD).
OUTLOOK FOR SUN JUL 20        240 (POOR).
OUTLOOK FOR MON JUL 21        218 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-6 MPH.         NW 12-13 MPH.
TRANSPORT WINDS               SW 4-11 MPH.        W 16-19 MPH.
MIXING HEIGHT                 4500 FT MSL.        11000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUL 20        GOOD.
OUTLOOK FOR MON JUL 21        GOOD.

VENTILATION INDEX (CATEGORY)  251 (POOR).         1045 (GOOD).
OUTLOOK FOR SUN JUL 20        436 (FAIR).
OUTLOOK FOR MON JUL 21        365 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 11-24 MPH.       W 14-18 MPH.
TRANSPORT WINDS               SW 14-23 MPH.       W 20-22 MPH.
MIXING HEIGHT                 2000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SUN JUL 20        FAIR.
OUTLOOK FOR MON JUL 21        FAIR.

VENTILATION INDEX (CATEGORY)  361 (FAIR).         1024 (GOOD).
OUTLOOK FOR SUN JUL 20        544 (FAIR).
OUTLOOK FOR MON JUL 21        354 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      738 (GOOD)
ELLENSBURG    940 (GOOD)
GOLDENDALE    806 (GOOD)
TRI-CITIES    761 (GOOD)
WALLA WALLA  1050 (GOOD)
YAKIMA        549 (FAIR)
BEND          662 (GOOD)
PRINEVILLE    892 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON    1050 (GOOD)
JOHN DAY     1050 (GOOD)
LA GRANDE    1050 (GOOD)
MADRAS        653 (GOOD)
MEACHAM       894 (GOOD)
PENDLETON    1050 (GOOD)
REDMOND       901 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    929 (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.
$$