183
AUUS46 KPDT 051325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST WED NOV  5 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 8-17 MPH.        SW 17-24 MPH.
TRANSPORT WINDS               W 9-17 MPH.         SW 17-24 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU NOV 6         GOOD.
OUTLOOK FOR FRI NOV 7         GOOD.

VENTILATION INDEX (CATEGORY)  50 (POOR).          308 (FAIR).
OUTLOOK FOR THU NOV 6         688 (GOOD).
OUTLOOK FOR FRI NOV 7         773 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-10 MPH.        SW 11-18 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        SW 11-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU NOV 6         GOOD.
OUTLOOK FOR FRI NOV 7         GOOD.

VENTILATION INDEX (CATEGORY)  31 (POOR).          144 (POOR).
OUTLOOK FOR THU NOV 6         393 (FAIR).
OUTLOOK FOR FRI NOV 7         550 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 18-27 MPH.        S 22-28 MPH.
TRANSPORT WINDS               S 19-27 MPH.        S 24-28 MPH.
MIXING HEIGHT                 4000 FT MSL.        6500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU NOV 6         GOOD.
OUTLOOK FOR FRI NOV 7         GOOD.

VENTILATION INDEX (CATEGORY)  285 (POOR).         737 (GOOD).
OUTLOOK FOR THU NOV 6         648 (GOOD).
OUTLOOK FOR FRI NOV 7         774 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 14-28 MPH.       SW 20-25 MPH.
TRANSPORT WINDS               S 15-28 MPH.        SW 21-30 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR THU NOV 6         GOOD.
OUTLOOK FOR FRI NOV 7         GOOD.

VENTILATION INDEX (CATEGORY)  163 (POOR).         591 (FAIR).
OUTLOOK FOR THU NOV 6         822 (GOOD).
OUTLOOK FOR FRI NOV 7         865 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      216 (POOR)
ELLENSBURG    164 (POOR)
GOLDENDALE    243 (POOR)
TRI-CITIES    148 (POOR)
WALLA WALLA   352 (FAIR)
YAKIMA        117 (POOR)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE    809 (GOOD)
HERMISTON     217 (POOR)
JOHN DAY     1050 (GOOD)
LA GRANDE     796 (GOOD)
MADRAS       1050 (GOOD)
MEACHAM       737 (GOOD)
PENDLETON     561 (FAIR)
REDMOND      1050 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    147 (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.
$$