983
AUUS46 KPDT 221225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT AUG 22 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 7-17 MPH.        W 14-21 MPH.
TRANSPORT WINDS               SW 7-16 MPH.        W 17-23 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN AUG 23        FAIR.
OUTLOOK FOR MON AUG 24        FAIR.

VENTILATION INDEX (CATEGORY)  96 (POOR).          573 (FAIR).
OUTLOOK FOR SUN AUG 23        538 (FAIR).
OUTLOOK FOR MON AUG 24        209 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 1-7 MPH.          SW 14-20 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         SW 18-22 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN AUG 23        FAIR.
OUTLOOK FOR MON AUG 24        POOR.

VENTILATION INDEX (CATEGORY)  42 (POOR).          802 (GOOD).
OUTLOOK FOR SUN AUG 23        316 (FAIR).
OUTLOOK FOR MON AUG 24        145 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-4 MPH.         W 6-9 MPH.
TRANSPORT WINDS               N 3-6 MPH.          SW 13-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN AUG 23        GOOD.
OUTLOOK FOR MON AUG 24        FAIR.

VENTILATION INDEX (CATEGORY)  30 (POOR).          840 (GOOD).
OUTLOOK FOR SUN AUG 23        532 (FAIR).
OUTLOOK FOR MON AUG 24        185 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-11 MPH.         W 9-15 MPH.
TRANSPORT WINDS               S 6-11 MPH.         W 12-17 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN AUG 23        FAIR.
OUTLOOK FOR MON AUG 24        FAIR.

VENTILATION INDEX (CATEGORY)  61 (POOR).          410 (FAIR).
OUTLOOK FOR SUN AUG 23        522 (FAIR).
OUTLOOK FOR MON AUG 24        209 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      288 (POOR)
ELLENSBURG    560 (FAIR)
GOLDENDALE    671 (GOOD)
TRI-CITIES    683 (GOOD)
WALLA WALLA   470 (FAIR)
YAKIMA        741 (GOOD)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON     678 (GOOD)
JOHN DAY     1050 (GOOD)
LA GRANDE     649 (GOOD)
MADRAS        876 (GOOD)
MEACHAM       304 (FAIR)
PENDLETON     498 (FAIR)
REDMOND      1050 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    565 (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.
$$