761
AUUS46 KPDT 041225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON AUG  4 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 9-20 MPH.        SW 11-14 MPH.
TRANSPORT WINDS               SW 12-21 MPH.       SW 12-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR TUE AUG 5         FAIR.
OUTLOOK FOR WED AUG 6         FAIR.

VENTILATION INDEX (CATEGORY)  208 (POOR).         574 (FAIR).
OUTLOOK FOR TUE AUG 5         624 (GOOD).
OUTLOOK FOR WED AUG 6         675 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-8 MPH.          W 5-9 MPH.
TRANSPORT WINDS               W 6-11 MPH.         W 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE AUG 5         FAIR.
OUTLOOK FOR WED AUG 6         FAIR.

VENTILATION INDEX (CATEGORY)  109 (POOR).         352 (FAIR).
OUTLOOK FOR TUE AUG 5         301 (FAIR).
OUTLOOK FOR WED AUG 6         446 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         NW 5-6 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         W 6-8 MPH.
MIXING HEIGHT                 4000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE AUG 5         GOOD.
OUTLOOK FOR WED AUG 6         FAIR.

VENTILATION INDEX (CATEGORY)  115 (POOR).         274 (POOR).
OUTLOOK FOR TUE AUG 5         525 (FAIR).
OUTLOOK FOR WED AUG 6         294 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 7-18 MPH.        W 7-13 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       SW 8-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR TUE AUG 5         FAIR.
OUTLOOK FOR WED AUG 6         FAIR.

VENTILATION INDEX (CATEGORY)  196 (POOR).         382 (FAIR).
OUTLOOK FOR TUE AUG 5         527 (FAIR).
OUTLOOK FOR WED AUG 6         548 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      525 (FAIR)
ELLENSBURG    650 (GOOD)
GOLDENDALE    566 (FAIR)
TRI-CITIES    582 (FAIR)
WALLA WALLA   460 (FAIR)
YAKIMA        361 (FAIR)
BEND          428 (FAIR)
PRINEVILLE    499 (FAIR)
ENTERPRISE    222 (POOR)
HERMISTON     665 (GOOD)
JOHN DAY      397 (FAIR)
LA GRANDE     298 (POOR)
MADRAS        411 (FAIR)
MEACHAM       155 (POOR)
PENDLETON     545 (FAIR)
REDMOND       543 (FAIR)
SENECA        494 (FAIR)
THE DALLES    757 (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.
$$