121
AUUS46 KPDT 141225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT MON SEP 14 2026

*** AIR DISPERSION CATEGORIES:   GOOD, FAIR, POOR ***

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 7-17 MPH.        SW 5-9 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       SW 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR TUE SEP 15        FAIR.
OUTLOOK FOR WED SEP 16        FAIR.

VENTILATION INDEX (CATEGORY)  151 (POOR).         420 (FAIR).
OUTLOOK FOR TUE SEP 15        123 (POOR).
OUTLOOK FOR WED SEP 16        247 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-7 MPH.         SE 3-8 MPH.
TRANSPORT WINDS               W 4-9 MPH.          S 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE SEP 15        POOR.
OUTLOOK FOR WED SEP 16        FAIR.

VENTILATION INDEX (CATEGORY)  34 (POOR).          122 (POOR).
OUTLOOK FOR TUE SEP 15        154 (POOR).
OUTLOOK FOR WED SEP 16        410 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-6 MPH.         S 1-4 MPH.
TRANSPORT WINDS               W 6-11 MPH.         W 5-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE SEP 15        FAIR.
OUTLOOK FOR WED SEP 16        FAIR.

VENTILATION INDEX (CATEGORY)  90 (POOR).          237 (POOR).
OUTLOOK FOR TUE SEP 15        186 (POOR).
OUTLOOK FOR WED SEP 16        413 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 7-16 MPH.         W 4-8 MPH.
TRANSPORT WINDS               SW 12-20 MPH.       SW 8-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR TUE SEP 15        FAIR.
OUTLOOK FOR WED SEP 16        FAIR.

VENTILATION INDEX (CATEGORY)  180 (POOR).         406 (FAIR).
OUTLOOK FOR TUE SEP 15        138 (POOR).
OUTLOOK FOR WED SEP 16        219 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      328 (FAIR)
ELLENSBURG    331 (FAIR)
GOLDENDALE    319 (FAIR)
TRI-CITIES    328 (FAIR)
WALLA WALLA   486 (FAIR)
YAKIMA        116 (POOR)
BEND          145 (POOR)
PRINEVILLE    136 (POOR)
ENTERPRISE    281 (POOR)
HERMISTON     476 (FAIR)
JOHN DAY      252 (POOR)
LA GRANDE     275 (POOR)
MADRAS        148 (POOR)
MEACHAM       273 (POOR)
PENDLETON     410 (FAIR)
REDMOND       132 (POOR)
SENECA        293 (POOR)
THE DALLES    439 (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.
$$