815
AUUS46 KPDT 111225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE AUG 11 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-11 MPH.         W 6-12 MPH.
TRANSPORT WINDS               SW 7-12 MPH.        W 7-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 12        FAIR.
OUTLOOK FOR THU AUG 13        FAIR.

VENTILATION INDEX (CATEGORY)  84 (POOR).          392 (FAIR).
OUTLOOK FOR WED AUG 12        475 (FAIR).
OUTLOOK FOR THU AUG 13        284 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 1-5 MPH.          NW 2-6 MPH.
TRANSPORT WINDS               NW 4-9 MPH.         W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 12        FAIR.
OUTLOOK FOR THU AUG 13        POOR.

VENTILATION INDEX (CATEGORY)  47 (POOR).          297 (POOR).
OUTLOOK FOR WED AUG 12        383 (FAIR).
OUTLOOK FOR THU AUG 13        315 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 0-2 MPH.         NW 8-11 MPH.
TRANSPORT WINDS               W 3-6 MPH.          W 10-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED AUG 12        GOOD.
OUTLOOK FOR THU AUG 13        GOOD.

VENTILATION INDEX (CATEGORY)  35 (POOR).          426 (FAIR).
OUTLOOK FOR WED AUG 12        461 (FAIR).
OUTLOOK FOR THU AUG 13        399 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-10 MPH.         W 8-10 MPH.
TRANSPORT WINDS               S 7-13 MPH.         W 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 12        FAIR.
OUTLOOK FOR THU AUG 13        FAIR.

VENTILATION INDEX (CATEGORY)  89 (POOR).          398 (FAIR).
OUTLOOK FOR WED AUG 12        483 (FAIR).
OUTLOOK FOR THU AUG 13        283 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      474 (FAIR)
ELLENSBURG    898 (GOOD)
GOLDENDALE    541 (FAIR)
TRI-CITIES    269 (POOR)
WALLA WALLA   367 (FAIR)
YAKIMA        318 (FAIR)
BEND          478 (FAIR)
PRINEVILLE    505 (FAIR)
ENTERPRISE    538 (FAIR)
HERMISTON     359 (FAIR)
JOHN DAY      535 (FAIR)
LA GRANDE     439 (FAIR)
MADRAS        469 (FAIR)
MEACHAM       352 (FAIR)
PENDLETON     416 (FAIR)
REDMOND       486 (FAIR)
SENECA        686 (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.
$$