353
AUUS46 KPDT 231225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN AUG 23 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 11-23 MPH.       W 10-14 MPH.
TRANSPORT WINDS               SW 13-23 MPH.       W 11-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           GOOD.               FAIR.
OUTLOOK FOR MON AUG 24        FAIR.
OUTLOOK FOR TUE AUG 25        FAIR.

VENTILATION INDEX (CATEGORY)  234 (POOR).         585 (FAIR).
OUTLOOK FOR MON AUG 24        296 (POOR).
OUTLOOK FOR TUE AUG 25        141 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-10 MPH.         NW 3-7 MPH.
TRANSPORT WINDS               W 6-12 MPH.         NW 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON AUG 24        POOR.
OUTLOOK FOR TUE AUG 25        FAIR.

VENTILATION INDEX (CATEGORY)  101 (POOR).         309 (FAIR).
OUTLOOK FOR MON AUG 24        231 (POOR).
OUTLOOK FOR TUE AUG 25        222 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 1-3 MPH.         NW 4-8 MPH.
TRANSPORT WINDS               NW 3-7 MPH.         W 10-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON AUG 24        GOOD.
OUTLOOK FOR TUE AUG 25        GOOD.

VENTILATION INDEX (CATEGORY)  58 (POOR).          520 (FAIR).
OUTLOOK FOR MON AUG 24        244 (POOR).
OUTLOOK FOR TUE AUG 25        706 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-19 MPH.         W 8-13 MPH.
TRANSPORT WINDS               SW 10-23 MPH.       W 11-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR MON AUG 24        FAIR.
OUTLOOK FOR TUE AUG 25        FAIR.

VENTILATION INDEX (CATEGORY)  200 (POOR).         551 (FAIR).
OUTLOOK FOR MON AUG 24        286 (POOR).
OUTLOOK FOR TUE AUG 25        222 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      533 (FAIR)
ELLENSBURG    854 (GOOD)
GOLDENDALE    510 (FAIR)
TRI-CITIES    469 (FAIR)
WALLA WALLA   643 (GOOD)
YAKIMA        381 (FAIR)
BEND          322 (FAIR)
PRINEVILLE    333 (FAIR)
ENTERPRISE    524 (FAIR)
HERMISTON     576 (FAIR)
JOHN DAY      600 (FAIR)
LA GRANDE     611 (GOOD)
MADRAS        216 (POOR)
MEACHAM       392 (FAIR)
PENDLETON     542 (FAIR)
REDMOND       318 (FAIR)
SENECA        748 (GOOD)
THE DALLES    574 (FAIR)

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.
$$