475
AUUS46 KPDT 131225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED AUG 13 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 8-18 MPH.        W 20-26 MPH.
TRANSPORT WINDS               SW 10-18 MPH.       W 21-27 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU AUG 14        GOOD.
OUTLOOK FOR FRI AUG 15        GOOD.

VENTILATION INDEX (CATEGORY)  192 (POOR).         1047 (GOOD).
OUTLOOK FOR THU AUG 14        763 (GOOD).
OUTLOOK FOR FRI AUG 15        865 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 5-10 MPH.         W 17-20 MPH.
TRANSPORT WINDS               W 6-10 MPH.         W 20-22 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU AUG 14        FAIR.
OUTLOOK FOR FRI AUG 15        GOOD.

VENTILATION INDEX (CATEGORY)  109 (POOR).         1050 (GOOD).
OUTLOOK FOR THU AUG 14        326 (FAIR).
OUTLOOK FOR FRI AUG 15        955 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-7 MPH.         W 15-17 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         W 17-21 MPH.
MIXING HEIGHT                 4000 FT MSL.        11000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU AUG 14        GOOD.
OUTLOOK FOR FRI AUG 15        GOOD.

VENTILATION INDEX (CATEGORY)  164 (POOR).         1050 (GOOD).
OUTLOOK FOR THU AUG 14        593 (FAIR).
OUTLOOK FOR FRI AUG 15        569 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 9-19 MPH.         W 19-24 MPH.
TRANSPORT WINDS               SW 11-18 MPH.       W 23-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU AUG 14        GOOD.
OUTLOOK FOR FRI AUG 15        GOOD.

VENTILATION INDEX (CATEGORY)  268 (POOR).         1047 (GOOD).
OUTLOOK FOR THU AUG 14        750 (GOOD).
OUTLOOK FOR FRI AUG 15        856 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM     1050 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE    961 (GOOD)
TRI-CITIES   1050 (GOOD)
WALLA WALLA  1050 (GOOD)
YAKIMA       1050 (GOOD)
BEND          793 (GOOD)
PRINEVILLE    946 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON    1050 (GOOD)
JOHN DAY     1050 (GOOD)
LA GRANDE    1050 (GOOD)
MADRAS        774 (GOOD)
MEACHAM      1022 (GOOD)
PENDLETON    1050 (GOOD)
REDMOND      1020 (GOOD)
SENECA       1016 (GOOD)
THE DALLES   1050 (GOOD)

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.
$$