058
AUUS46 KPDT 041225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED JUN  4 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 7-13 MPH.         W 7-10 MPH.
TRANSPORT WINDS               SW 8-14 MPH.        SW 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU JUN 5         FAIR.
OUTLOOK FOR FRI JUN 6         FAIR.

VENTILATION INDEX (CATEGORY)  151 (POOR).         443 (FAIR).
OUTLOOK FOR THU JUN 5         287 (POOR).
OUTLOOK FOR FRI JUN 6         578 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-6 MPH.          S 3-6 MPH.
TRANSPORT WINDS               W 4-7 MPH.          SE 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU JUN 5         POOR.
OUTLOOK FOR FRI JUN 6         FAIR.

VENTILATION INDEX (CATEGORY)  83 (POOR).          211 (POOR).
OUTLOOK FOR THU JUN 5         277 (POOR).
OUTLOOK FOR FRI JUN 6         437 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 1-3 MPH.          N 6-8 MPH.
TRANSPORT WINDS               W 3-6 MPH.          N 7-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        11000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU JUN 5         GOOD.
OUTLOOK FOR FRI JUN 6         GOOD.

VENTILATION INDEX (CATEGORY)  63 (POOR).          389 (FAIR).
OUTLOOK FOR THU JUN 5         479 (FAIR).
OUTLOOK FOR FRI JUN 6         406 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-13 MPH.         NW 7-10 MPH.
TRANSPORT WINDS               SW 8-14 MPH.        W 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU JUN 5         FAIR.
OUTLOOK FOR FRI JUN 6         FAIR.

VENTILATION INDEX (CATEGORY)  155 (POOR).         353 (FAIR).
OUTLOOK FOR THU JUN 5         330 (FAIR).
OUTLOOK FOR FRI JUN 6         485 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      352 (FAIR)
ELLENSBURG    335 (FAIR)
GOLDENDALE    487 (FAIR)
TRI-CITIES    398 (FAIR)
WALLA WALLA   286 (POOR)
YAKIMA        144 (POOR)
BEND          390 (FAIR)
PRINEVILLE    392 (FAIR)
ENTERPRISE    353 (FAIR)
HERMISTON     425 (FAIR)
JOHN DAY      285 (POOR)
LA GRANDE     342 (FAIR)
MADRAS        381 (FAIR)
MEACHAM       153 (POOR)
PENDLETON     403 (FAIR)
REDMOND       411 (FAIR)
SENECA        324 (FAIR)
THE DALLES    632 (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.
$$