359
AUUS46 KPDT 031225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT THU JUL  3 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 8-15 MPH.        W 8-11 MPH.
TRANSPORT WINDS               SW 9-15 MPH.        W 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR FRI JUL 4         FAIR.
OUTLOOK FOR SAT JUL 5         GOOD.

VENTILATION INDEX (CATEGORY)  204 (POOR).         482 (FAIR).
OUTLOOK FOR FRI JUL 4         373 (FAIR).
OUTLOOK FOR SAT JUL 5         693 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 4-8 MPH.         N 4-7 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        W 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI JUL 4         FAIR.
OUTLOOK FOR SAT JUL 5         FAIR.

VENTILATION INDEX (CATEGORY)  113 (POOR).         347 (FAIR).
OUTLOOK FOR FRI JUL 4         281 (POOR).
OUTLOOK FOR SAT JUL 5         336 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 2-5 MPH.          NW 7-10 MPH.
TRANSPORT WINDS               W 4-7 MPH.          NW 8-10 MPH.
MIXING HEIGHT                 4000 FT MSL.        9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI JUL 4         FAIR.
OUTLOOK FOR SAT JUL 5         GOOD.

VENTILATION INDEX (CATEGORY)  126 (POOR).         424 (FAIR).
OUTLOOK FOR FRI JUL 4         146 (POOR).
OUTLOOK FOR SAT JUL 5         392 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-16 MPH.         W 7-12 MPH.
TRANSPORT WINDS               SW 10-17 MPH.       W 9-12 MPH.
MIXING HEIGHT                 2000 FT MSL.        6500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR FRI JUL 4         FAIR.
OUTLOOK FOR SAT JUL 5         FAIR.

VENTILATION INDEX (CATEGORY)  222 (POOR).         468 (FAIR).
OUTLOOK FOR FRI JUL 4         232 (POOR).
OUTLOOK FOR SAT JUL 5         622 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      674 (GOOD)
ELLENSBURG    834 (GOOD)
GOLDENDALE    567 (FAIR)
TRI-CITIES    369 (FAIR)
WALLA WALLA   486 (FAIR)
YAKIMA        355 (FAIR)
BEND          411 (FAIR)
PRINEVILLE    393 (FAIR)
ENTERPRISE    465 (FAIR)
HERMISTON     488 (FAIR)
JOHN DAY      586 (FAIR)
LA GRANDE     486 (FAIR)
MADRAS        354 (FAIR)
MEACHAM       347 (FAIR)
PENDLETON     561 (FAIR)
REDMOND       393 (FAIR)
SENECA        738 (GOOD)
THE DALLES    698 (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.
$$