030
AUUS46 KPDT 061225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN JUL  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                 S 4-9 MPH.          NW 6-8 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         W 6-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON JUL 7         FAIR.
OUTLOOK FOR TUE JUL 8         FAIR.

VENTILATION INDEX (CATEGORY)  71 (POOR).          331 (FAIR).
OUTLOOK FOR MON JUL 7         146 (POOR).
OUTLOOK FOR TUE JUL 8         518 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-5 MPH.         NW 3-6 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        W 4-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON JUL 7         FAIR.
OUTLOOK FOR TUE JUL 8         GOOD.

VENTILATION INDEX (CATEGORY)  76 (POOR).          253 (POOR).
OUTLOOK FOR MON JUL 7         270 (POOR).
OUTLOOK FOR TUE JUL 8         480 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 1-2 MPH.          N 6-6 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         NW 7-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON JUL 7         GOOD.
OUTLOOK FOR TUE JUL 8         GOOD.

VENTILATION INDEX (CATEGORY)  58 (POOR).          353 (FAIR).
OUTLOOK FOR MON JUL 7         271 (POOR).
OUTLOOK FOR TUE JUL 8         512 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-10 MPH.         NW 6-10 MPH.
TRANSPORT WINDS               SW 6-12 MPH.        W 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON JUL 7         FAIR.
OUTLOOK FOR TUE JUL 8         FAIR.

VENTILATION INDEX (CATEGORY)  93 (POOR).          384 (FAIR).
OUTLOOK FOR MON JUL 7         255 (POOR).
OUTLOOK FOR TUE JUL 8         510 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      388 (FAIR)
ELLENSBURG    425 (FAIR)
GOLDENDALE    311 (FAIR)
TRI-CITIES    292 (POOR)
WALLA WALLA   331 (FAIR)
YAKIMA        261 (POOR)
BEND          102 (POOR)
PRINEVILLE    299 (POOR)
ENTERPRISE    369 (FAIR)
HERMISTON     222 (POOR)
JOHN DAY      423 (FAIR)
LA GRANDE     428 (FAIR)
MADRAS        293 (POOR)
MEACHAM       345 (FAIR)
PENDLETON     353 (FAIR)
REDMOND       287 (POOR)
SENECA        449 (FAIR)
THE DALLES    324 (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.
$$