163
AUUS46 KPDT 261225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT JUL 26 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 7-14 MPH.         W 11-15 MPH.
TRANSPORT WINDS               SW 7-13 MPH.        W 14-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUL 27        FAIR.
OUTLOOK FOR MON JUL 28        FAIR.

VENTILATION INDEX (CATEGORY)  160 (POOR).         715 (GOOD).
OUTLOOK FOR SUN JUL 27        385 (FAIR).
OUTLOOK FOR MON JUL 28        270 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          SW 6-11 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         SW 11-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUL 27        FAIR.
OUTLOOK FOR MON JUL 28        FAIR.

VENTILATION INDEX (CATEGORY)  71 (POOR).          641 (GOOD).
OUTLOOK FOR SUN JUL 27        363 (FAIR).
OUTLOOK FOR MON JUL 28        346 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 2-5 MPH.          NW 6-8 MPH.
TRANSPORT WINDS               W 4-7 MPH.          W 9-11 MPH.
MIXING HEIGHT                 4000 FT MSL.        10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUL 27        GOOD.
OUTLOOK FOR MON JUL 28        GOOD.

VENTILATION INDEX (CATEGORY)  99 (POOR).          494 (FAIR).
OUTLOOK FOR SUN JUL 27        268 (POOR).
OUTLOOK FOR MON JUL 28        203 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-14 MPH.         W 8-14 MPH.
TRANSPORT WINDS               SW 9-13 MPH.        W 12-17 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUL 27        FAIR.
OUTLOOK FOR MON JUL 28        FAIR.

VENTILATION INDEX (CATEGORY)  189 (POOR).         609 (GOOD).
OUTLOOK FOR SUN JUL 27        309 (FAIR).
OUTLOOK FOR MON JUL 28        258 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      630 (GOOD)
ELLENSBURG    694 (GOOD)
GOLDENDALE    772 (GOOD)
TRI-CITIES    740 (GOOD)
WALLA WALLA   645 (GOOD)
YAKIMA        586 (FAIR)
BEND          730 (GOOD)
PRINEVILLE    579 (FAIR)
ENTERPRISE    539 (FAIR)
HERMISTON     794 (GOOD)
JOHN DAY      823 (GOOD)
LA GRANDE     555 (FAIR)
MADRAS        638 (GOOD)
MEACHAM       412 (FAIR)
PENDLETON     636 (GOOD)
REDMOND       594 (FAIR)
SENECA       1034 (GOOD)
THE DALLES    719 (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.
$$