682
AUUS46 KPDT 161325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST SUN NOV 16 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-5 MPH.         SW 3-6 MPH.
TRANSPORT WINDS               E 3-7 MPH.          SW 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON NOV 17        POOR.
OUTLOOK FOR TUE NOV 18        FAIR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          41 (POOR).
OUTLOOK FOR MON NOV 17        77 (POOR).
OUTLOOK FOR TUE NOV 18        336 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-4 MPH.         SE 2-5 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         S 2-4 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON NOV 17        POOR.
OUTLOOK FOR TUE NOV 18        FAIR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          32 (POOR).
OUTLOOK FOR MON NOV 17        52 (POOR).
OUTLOOK FOR TUE NOV 18        209 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 5-10 MPH.         S 4-7 MPH.
TRANSPORT WINDS               S 8-14 MPH.         S 13-19 MPH.
MIXING HEIGHT                 4000 FT MSL.        5000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON NOV 17        FAIR.
OUTLOOK FOR TUE NOV 18        FAIR.

VENTILATION INDEX (CATEGORY)  118 (POOR).         269 (POOR).
OUTLOOK FOR MON NOV 17        259 (POOR).
OUTLOOK FOR TUE NOV 18        201 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-9 MPH.         SW 3-6 MPH.
TRANSPORT WINDS               SE 5-13 MPH.        SW 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       NEAR SURFACE.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON NOV 17        POOR.
OUTLOOK FOR TUE NOV 18        FAIR.

VENTILATION INDEX (CATEGORY)  53 (POOR).          54 (POOR).
OUTLOOK FOR MON NOV 17        115 (POOR).
OUTLOOK FOR TUE NOV 18        332 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       79 (POOR)
ELLENSBURG     42 (POOR)
GOLDENDALE     93 (POOR)
TRI-CITIES     44 (POOR)
WALLA WALLA    45 (POOR)
YAKIMA         25 (POOR)
BEND          136 (POOR)
PRINEVILLE     55 (POOR)
ENTERPRISE    123 (POOR)
HERMISTON      33 (POOR)
JOHN DAY      194 (POOR)
LA GRANDE     262 (POOR)
MADRAS         65 (POOR)
MEACHAM        80 (POOR)
PENDLETON      49 (POOR)
REDMOND        43 (POOR)
SENECA        201 (POOR)
THE DALLES     70 (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.
$$