596
AUUS46 KPDT 211225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON JUL 21 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.         NW 7-10 MPH.
TRANSPORT WINDS               S 7-12 MPH.         W 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE JUL 22        FAIR.
OUTLOOK FOR WED JUL 23        FAIR.

VENTILATION INDEX (CATEGORY)  80 (POOR).          222 (POOR).
OUTLOOK FOR TUE JUL 22        518 (FAIR).
OUTLOOK FOR WED JUL 23        416 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 3-7 MPH.         N 6-8 MPH.
TRANSPORT WINDS               S 4-8 MPH.          NE 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE JUL 22        FAIR.
OUTLOOK FOR WED JUL 23        FAIR.

VENTILATION INDEX (CATEGORY)  66 (POOR).          198 (POOR).
OUTLOOK FOR TUE JUL 22        350 (FAIR).
OUTLOOK FOR WED JUL 23        410 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-4 MPH.         NW 3-5 MPH.
TRANSPORT WINDS               N 6-8 MPH.          W 6-8 MPH.
MIXING HEIGHT                 4500 FT MSL.        6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE JUL 22        GOOD.
OUTLOOK FOR WED JUL 23        GOOD.

VENTILATION INDEX (CATEGORY)  72 (POOR).          185 (POOR).
OUTLOOK FOR TUE JUL 22        367 (FAIR).
OUTLOOK FOR WED JUL 23        454 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-8 MPH.          NW 6-8 MPH.
TRANSPORT WINDS               SE 8-11 MPH.        W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE JUL 22        FAIR.
OUTLOOK FOR WED JUL 23        FAIR.

VENTILATION INDEX (CATEGORY)  80 (POOR).          202 (POOR).
OUTLOOK FOR TUE JUL 22        455 (FAIR).
OUTLOOK FOR WED JUL 23        469 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      269 (POOR)
ELLENSBURG    257 (POOR)
GOLDENDALE    311 (FAIR)
TRI-CITIES     26 (POOR)
WALLA WALLA   152 (POOR)
YAKIMA        274 (POOR)
BEND          392 (FAIR)
PRINEVILLE    466 (FAIR)
ENTERPRISE     53 (POOR)
HERMISTON     261 (POOR)
JOHN DAY      312 (FAIR)
LA GRANDE     169 (POOR)
MADRAS        442 (FAIR)
MEACHAM       157 (POOR)
PENDLETON     274 (POOR)
REDMOND       487 (FAIR)
SENECA        304 (FAIR)
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.
$$