910
AUUS46 KPDT 011225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE JUL  1 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 2-5 MPH.          NW 6-9 MPH.
TRANSPORT WINDS               SW 4-7 MPH.         NW 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUL 2         GOOD.
OUTLOOK FOR THU JUL 3         GOOD.

VENTILATION INDEX (CATEGORY)  44 (POOR).          320 (FAIR).
OUTLOOK FOR WED JUL 2         632 (GOOD).
OUTLOOK FOR THU JUL 3         578 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          SW 5-7 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        SW 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED JUL 2         GOOD.
OUTLOOK FOR THU JUL 3         FAIR.

VENTILATION INDEX (CATEGORY)  76 (POOR).          341 (FAIR).
OUTLOOK FOR WED JUL 2         548 (FAIR).
OUTLOOK FOR THU JUL 3         394 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 1-3 MPH.          N 7-9 MPH.
TRANSPORT WINDS               N 5-6 MPH.          N 7-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED JUL 2         GOOD.
OUTLOOK FOR THU JUL 3         GOOD.

VENTILATION INDEX (CATEGORY)  83 (POOR).          471 (FAIR).
OUTLOOK FOR WED JUL 2         465 (FAIR).
OUTLOOK FOR THU JUL 3         459 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-7 MPH.          N 6-8 MPH.
TRANSPORT WINDS               S 4-7 MPH.          NW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED JUL 2         GOOD.
OUTLOOK FOR THU JUL 3         FAIR.

VENTILATION INDEX (CATEGORY)  35 (POOR).          330 (FAIR).
OUTLOOK FOR WED JUL 2         674 (GOOD).
OUTLOOK FOR THU JUL 3         557 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      473 (FAIR)
ELLENSBURG    683 (GOOD)
GOLDENDALE    538 (FAIR)
TRI-CITIES    267 (POOR)
WALLA WALLA   258 (POOR)
YAKIMA        413 (FAIR)
BEND          470 (FAIR)
PRINEVILLE    582 (FAIR)
ENTERPRISE    344 (FAIR)
HERMISTON     267 (POOR)
JOHN DAY      171 (POOR)
LA GRANDE     467 (FAIR)
MADRAS        484 (FAIR)
MEACHAM       280 (POOR)
PENDLETON     357 (FAIR)
REDMOND       583 (FAIR)
SENECA        220 (POOR)
THE DALLES    441 (FAIR)

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.
$$