980
AUUS46 KPDT 111325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST TUE NOV 11 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 2-6 MPH.          N 3-6 MPH.
TRANSPORT WINDS               SW 5-10 MPH.        N 5-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED NOV 12        POOR.
OUTLOOK FOR THU NOV 13        FAIR.

VENTILATION INDEX (CATEGORY)  29 (POOR).          39 (POOR).
OUTLOOK FOR WED NOV 12        43 (POOR).
OUTLOOK FOR THU NOV 13        98 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-5 MPH.         E 2-5 MPH.
TRANSPORT WINDS               NW 3-7 MPH.         E 2-4 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED NOV 12        POOR.
OUTLOOK FOR THU NOV 13        POOR.

VENTILATION INDEX (CATEGORY)  27 (POOR).          31 (POOR).
OUTLOOK FOR WED NOV 12        37 (POOR).
OUTLOOK FOR THU NOV 13        62 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-4 MPH.          S 3-7 MPH.
TRANSPORT WINDS               S 5-6 MPH.          S 12-16 MPH.
MIXING HEIGHT                 4000 FT MSL.        6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED NOV 12        GOOD.
OUTLOOK FOR THU NOV 13        GOOD.

VENTILATION INDEX (CATEGORY)  53 (POOR).          283 (POOR).
OUTLOOK FOR WED NOV 12        390 (FAIR).
OUTLOOK FOR THU NOV 13        723 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-9 MPH.          N 2-5 MPH.
TRANSPORT WINDS               S 5-13 MPH.         N 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED NOV 12        POOR.
OUTLOOK FOR THU NOV 13        FAIR.

VENTILATION INDEX (CATEGORY)  41 (POOR).          51 (POOR).
OUTLOOK FOR WED NOV 12        48 (POOR).
OUTLOOK FOR THU NOV 13        315 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       30 (POOR)
ELLENSBURG     26 (POOR)
GOLDENDALE     43 (POOR)
TRI-CITIES     47 (POOR)
WALLA WALLA    35 (POOR)
YAKIMA         31 (POOR)
BEND          205 (POOR)
PRINEVILLE    143 (POOR)
ENTERPRISE    156 (POOR)
HERMISTON      31 (POOR)
JOHN DAY      250 (POOR)
LA GRANDE     253 (POOR)
MADRAS         59 (POOR)
MEACHAM       118 (POOR)
PENDLETON      58 (POOR)
REDMOND       116 (POOR)
SENECA        308 (FAIR)
THE DALLES     42 (POOR)

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.
$$