281
AUUS46 KPDT 021225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT AUG  2 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 6-12 MPH.         W 10-13 MPH.
TRANSPORT WINDS               SW 7-13 MPH.        W 10-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN AUG 3         FAIR.
OUTLOOK FOR MON AUG 4         FAIR.

VENTILATION INDEX (CATEGORY)  110 (POOR).         585 (FAIR).
OUTLOOK FOR SUN AUG 3         341 (FAIR).
OUTLOOK FOR MON AUG 4         543 (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 4-8 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        W 6-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN AUG 3         FAIR.
OUTLOOK FOR MON AUG 4         FAIR.

VENTILATION INDEX (CATEGORY)  79 (POOR).          400 (FAIR).
OUTLOOK FOR SUN AUG 3         232 (POOR).
OUTLOOK FOR MON AUG 4         318 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 1-3 MPH.          NW 7-8 MPH.
TRANSPORT WINDS               W 3-6 MPH.          W 10-13 MPH.
MIXING HEIGHT                 4000 FT MSL.        13000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN AUG 3         GOOD.
OUTLOOK FOR MON AUG 4         FAIR.

VENTILATION INDEX (CATEGORY)  80 (POOR).          770 (GOOD).
OUTLOOK FOR SUN AUG 3         258 (POOR).
OUTLOOK FOR MON AUG 4         271 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-13 MPH.         W 9-13 MPH.
TRANSPORT WINDS               SW 9-13 MPH.        W 11-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN AUG 3         FAIR.
OUTLOOK FOR MON AUG 4         FAIR.

VENTILATION INDEX (CATEGORY)  141 (POOR).         637 (GOOD).
OUTLOOK FOR SUN AUG 3         278 (POOR).
OUTLOOK FOR MON AUG 4         364 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      616 (GOOD)
ELLENSBURG    903 (GOOD)
GOLDENDALE    660 (GOOD)
TRI-CITIES    514 (FAIR)
WALLA WALLA   593 (FAIR)
YAKIMA        357 (FAIR)
BEND          510 (FAIR)
PRINEVILLE    521 (FAIR)
ENTERPRISE    741 (GOOD)
HERMISTON     591 (FAIR)
JOHN DAY      673 (GOOD)
LA GRANDE     841 (GOOD)
MADRAS        465 (FAIR)
MEACHAM       594 (FAIR)
PENDLETON     646 (GOOD)
REDMOND       523 (FAIR)
SENECA        480 (FAIR)
THE DALLES    669 (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.
$$