243
AUUS46 KPDT 221225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED JUL 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                 SE 2-6 MPH.         N 4-8 MPH.
TRANSPORT WINDS               S 3-6 MPH.          NW 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU JUL 23        GOOD.
OUTLOOK FOR FRI JUL 24        FAIR.

VENTILATION INDEX (CATEGORY)  29 (POOR).          276 (POOR).
OUTLOOK FOR THU JUL 23        541 (FAIR).
OUTLOOK FOR FRI JUL 24        442 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-4 MPH.         SE 3-7 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         SW 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU JUL 23        FAIR.
OUTLOOK FOR FRI JUL 24        FAIR.

VENTILATION INDEX (CATEGORY)  36 (POOR).          298 (POOR).
OUTLOOK FOR THU JUL 23        486 (FAIR).
OUTLOOK FOR FRI JUL 24        440 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 0-2 MPH.          N 4-8 MPH.
TRANSPORT WINDS               N 4-5 MPH.          N 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU JUL 23        FAIR.
OUTLOOK FOR FRI JUL 24        GOOD.

VENTILATION INDEX (CATEGORY)  47 (POOR).          430 (FAIR).
OUTLOOK FOR THU JUL 23        361 (FAIR).
OUTLOOK FOR FRI JUL 24        398 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-6 MPH.         N 5-9 MPH.
TRANSPORT WINDS               SE 5-6 MPH.         NW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU JUL 23        FAIR.
OUTLOOK FOR FRI JUL 24        FAIR.

VENTILATION INDEX (CATEGORY)  30 (POOR).          345 (FAIR).
OUTLOOK FOR THU JUL 23        487 (FAIR).
OUTLOOK FOR FRI JUL 24        391 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      464 (FAIR)
ELLENSBURG    435 (FAIR)
GOLDENDALE    298 (POOR)
TRI-CITIES    221 (POOR)
WALLA WALLA   296 (POOR)
YAKIMA        372 (FAIR)
BEND          202 (POOR)
PRINEVILLE    398 (FAIR)
ENTERPRISE    417 (FAIR)
HERMISTON     201 (POOR)
JOHN DAY      406 (FAIR)
LA GRANDE     435 (FAIR)
MADRAS        375 (FAIR)
MEACHAM       299 (POOR)
PENDLETON     278 (POOR)
REDMOND       229 (POOR)
SENECA        278 (POOR)
THE DALLES    112 (POOR)

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.
$$