326
AUUS46 KPDT 051225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT JUL  5 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 9-19 MPH.        SW 9-12 MPH.
TRANSPORT WINDS               SW 12-19 MPH.       SW 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SUN JUL 6         FAIR.
OUTLOOK FOR MON JUL 7         FAIR.

VENTILATION INDEX (CATEGORY)  264 (POOR).         579 (FAIR).
OUTLOOK FOR SUN JUL 6         322 (FAIR).
OUTLOOK FOR MON JUL 7         209 (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 5-9 MPH.
TRANSPORT WINDS               W 5-9 MPH.          SW 6-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN JUL 6         POOR.
OUTLOOK FOR MON JUL 7         FAIR.

VENTILATION INDEX (CATEGORY)  92 (POOR).          333 (FAIR).
OUTLOOK FOR SUN JUL 6         204 (POOR).
OUTLOOK FOR MON JUL 7         233 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-3 MPH.         NW 5-7 MPH.
TRANSPORT WINDS               SW 3-6 MPH.         W 6-8 MPH.
MIXING HEIGHT                 4000 FT MSL.        9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN JUL 6         GOOD.
OUTLOOK FOR MON JUL 7         GOOD.

VENTILATION INDEX (CATEGORY)  85 (POOR).          399 (FAIR).
OUTLOOK FOR SUN JUL 6         329 (FAIR).
OUTLOOK FOR MON JUL 7         379 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-16 MPH.         W 7-12 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       SW 8-11 MPH.
MIXING HEIGHT                 2000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SUN JUL 6         FAIR.
OUTLOOK FOR MON JUL 7         FAIR.

VENTILATION INDEX (CATEGORY)  257 (POOR).         510 (FAIR).
OUTLOOK FOR SUN JUL 6         357 (FAIR).
OUTLOOK FOR MON JUL 7         269 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      529 (FAIR)
ELLENSBURG    612 (GOOD)
GOLDENDALE    507 (FAIR)
TRI-CITIES    481 (FAIR)
WALLA WALLA   483 (FAIR)
YAKIMA        342 (FAIR)
BEND          287 (POOR)
PRINEVILLE    248 (POOR)
ENTERPRISE    405 (FAIR)
HERMISTON     553 (FAIR)
JOHN DAY      560 (FAIR)
LA GRANDE     452 (FAIR)
MADRAS        231 (POOR)
MEACHAM       424 (FAIR)
PENDLETON     556 (FAIR)
REDMOND       271 (POOR)
SENECA        608 (GOOD)
THE DALLES    511 (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.
$$