864
AUUS46 KPDT 031225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN AUG  3 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 5-13 MPH.         SW 8-11 MPH.
TRANSPORT WINDS               SW 8-14 MPH.        SW 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 4         FAIR.
OUTLOOK FOR TUE AUG 5         GOOD.

VENTILATION INDEX (CATEGORY)  116 (POOR).         390 (FAIR).
OUTLOOK FOR MON AUG 4         551 (FAIR).
OUTLOOK FOR TUE AUG 5         726 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          S 5-9 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         SW 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 4         FAIR.
OUTLOOK FOR TUE AUG 5         FAIR.

VENTILATION INDEX (CATEGORY)  74 (POOR).          392 (FAIR).
OUTLOOK FOR MON AUG 4         304 (FAIR).
OUTLOOK FOR TUE AUG 5         395 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-3 MPH.         W 5-6 MPH.
TRANSPORT WINDS               W 3-6 MPH.          SW 7-10 MPH.
MIXING HEIGHT                 4000 FT MSL.        9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON AUG 4         GOOD.
OUTLOOK FOR TUE AUG 5         GOOD.

VENTILATION INDEX (CATEGORY)  57 (POOR).          329 (FAIR).
OUTLOOK FOR MON AUG 4         266 (POOR).
OUTLOOK FOR TUE AUG 5         699 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-12 MPH.         W 5-9 MPH.
TRANSPORT WINDS               SW 8-15 MPH.        S 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 4         FAIR.
OUTLOOK FOR TUE AUG 5         GOOD.

VENTILATION INDEX (CATEGORY)  118 (POOR).         268 (POOR).
OUTLOOK FOR MON AUG 4         464 (FAIR).
OUTLOOK FOR TUE AUG 5         634 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      452 (FAIR)
ELLENSBURG    599 (FAIR)
GOLDENDALE    547 (FAIR)
TRI-CITIES    396 (FAIR)
WALLA WALLA   337 (FAIR)
YAKIMA        386 (FAIR)
BEND          397 (FAIR)
PRINEVILLE    492 (FAIR)
ENTERPRISE    351 (FAIR)
HERMISTON     349 (FAIR)
JOHN DAY      149 (POOR)
LA GRANDE     315 (FAIR)
MADRAS        401 (FAIR)
MEACHAM       191 (POOR)
PENDLETON     291 (POOR)
REDMOND       474 (FAIR)
SENECA        119 (POOR)
THE DALLES    648 (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.
$$