585
AUUS46 KPDT 171225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN AUG 17 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 6-13 MPH.        W 5-9 MPH.
TRANSPORT WINDS               SW 8-14 MPH.        SW 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 18        FAIR.
OUTLOOK FOR TUE AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  134 (POOR).         381 (FAIR).
OUTLOOK FOR MON AUG 18        375 (FAIR).
OUTLOOK FOR TUE AUG 19        256 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          S 4-8 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         SW 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON AUG 18        GOOD.
OUTLOOK FOR TUE AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  78 (POOR).          470 (FAIR).
OUTLOOK FOR MON AUG 18        459 (FAIR).
OUTLOOK FOR TUE AUG 19        219 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-3 MPH.         W 2-4 MPH.
TRANSPORT WINDS               NW 4-7 MPH.         SW 7-8 MPH.
MIXING HEIGHT                 4000 FT MSL.        10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON AUG 18        GOOD.
OUTLOOK FOR TUE AUG 19        GOOD.

VENTILATION INDEX (CATEGORY)  84 (POOR).          319 (FAIR).
OUTLOOK FOR MON AUG 18        395 (FAIR).
OUTLOOK FOR TUE AUG 19        181 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-13 MPH.         NW 5-9 MPH.
TRANSPORT WINDS               SW 9-16 MPH.        SW 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR MON AUG 18        FAIR.
OUTLOOK FOR TUE AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  145 (POOR).         296 (POOR).
OUTLOOK FOR MON AUG 18        303 (FAIR).
OUTLOOK FOR TUE AUG 19        223 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      476 (FAIR)
ELLENSBURG    408 (FAIR)
GOLDENDALE    540 (FAIR)
TRI-CITIES    600 (FAIR)
WALLA WALLA   309 (FAIR)
YAKIMA        400 (FAIR)
BEND          661 (GOOD)
PRINEVILLE    392 (FAIR)
ENTERPRISE    281 (POOR)
HERMISTON     353 (FAIR)
JOHN DAY      505 (FAIR)
LA GRANDE     376 (FAIR)
MADRAS        365 (FAIR)
MEACHAM       264 (POOR)
PENDLETON     283 (POOR)
REDMOND       465 (FAIR)
SENECA        712 (GOOD)
THE DALLES    556 (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.
$$