482
AUUS46 KPDT 061225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED AUG  6 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 9-17 MPH.        W 12-17 MPH.
TRANSPORT WINDS               SW 10-17 MPH.       W 16-19 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR THU AUG 7         GOOD.
OUTLOOK FOR FRI AUG 8         FAIR.

VENTILATION INDEX (CATEGORY)  181 (POOR).         761 (GOOD).
OUTLOOK FOR THU AUG 7         993 (GOOD).
OUTLOOK FOR FRI AUG 8         483 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          W 10-15 MPH.
TRANSPORT WINDS               W 5-10 MPH.         W 15-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU AUG 7         GOOD.
OUTLOOK FOR FRI AUG 8         FAIR.

VENTILATION INDEX (CATEGORY)  116 (POOR).         712 (GOOD).
OUTLOOK FOR THU AUG 7         850 (GOOD).
OUTLOOK FOR FRI AUG 8         244 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-5 MPH.          NW 7-10 MPH.
TRANSPORT WINDS               W 4-8 MPH.          W 10-11 MPH.
MIXING HEIGHT                 4000 FT MSL.        8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU AUG 7         GOOD.
OUTLOOK FOR FRI AUG 8         GOOD.

VENTILATION INDEX (CATEGORY)  88 (POOR).          434 (FAIR).
OUTLOOK FOR THU AUG 7         930 (GOOD).
OUTLOOK FOR FRI AUG 8         339 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-16 MPH.         W 9-14 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       W 13-19 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR THU AUG 7         GOOD.
OUTLOOK FOR FRI AUG 8         FAIR.

VENTILATION INDEX (CATEGORY)  190 (POOR).         654 (GOOD).
OUTLOOK FOR THU AUG 7         1044 (GOOD).
OUTLOOK FOR FRI AUG 8         406 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      277 (POOR)
ELLENSBURG    424 (FAIR)
GOLDENDALE    679 (GOOD)
TRI-CITIES    802 (GOOD)
WALLA WALLA   773 (GOOD)
YAKIMA        489 (FAIR)
BEND          645 (GOOD)
PRINEVILLE    633 (GOOD)
ENTERPRISE    407 (FAIR)
HERMISTON     784 (GOOD)
JOHN DAY      679 (GOOD)
LA GRANDE     478 (FAIR)
MADRAS        725 (GOOD)
MEACHAM       386 (FAIR)
PENDLETON     705 (GOOD)
REDMOND       621 (GOOD)
SENECA        742 (GOOD)
THE DALLES    550 (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.
$$