540
AUUS46 KPDT 011225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE SEP  1 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-9 MPH.          SW 7-13 MPH.
TRANSPORT WINDS               SW 6-11 MPH.        SW 12-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 2         GOOD.
OUTLOOK FOR THU SEP 3         GOOD.

VENTILATION INDEX (CATEGORY)  67 (POOR).          413 (FAIR).
OUTLOOK FOR WED SEP 2         626 (GOOD).
OUTLOOK FOR THU SEP 3         924 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 0-6 MPH.          S 5-10 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         SW 8-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 2         GOOD.
OUTLOOK FOR THU SEP 3         FAIR.

VENTILATION INDEX (CATEGORY)  44 (POOR).          403 (FAIR).
OUTLOOK FOR WED SEP 2         1003 (GOOD).
OUTLOOK FOR THU SEP 3         785 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 1-3 MPH.         S 11-14 MPH.
TRANSPORT WINDS               SE 3-5 MPH.         S 18-21 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED SEP 2         FAIR.
OUTLOOK FOR THU SEP 3         GOOD.

VENTILATION INDEX (CATEGORY)  45 (POOR).          950 (GOOD).
OUTLOOK FOR WED SEP 2         398 (FAIR).
OUTLOOK FOR THU SEP 3         476 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-7 MPH.          W 4-8 MPH.
TRANSPORT WINDS               S 6-10 MPH.         SW 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 2         FAIR.
OUTLOOK FOR THU SEP 3         GOOD.

VENTILATION INDEX (CATEGORY)  65 (POOR).          291 (POOR).
OUTLOOK FOR WED SEP 2         443 (FAIR).
OUTLOOK FOR THU SEP 3         810 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      333 (FAIR)
ELLENSBURG    422 (FAIR)
GOLDENDALE    545 (FAIR)
TRI-CITIES    389 (FAIR)
WALLA WALLA   324 (FAIR)
YAKIMA        412 (FAIR)
BEND          787 (GOOD)
PRINEVILLE    631 (GOOD)
ENTERPRISE    677 (GOOD)
HERMISTON     518 (FAIR)
JOHN DAY     1050 (GOOD)
LA GRANDE     806 (GOOD)
MADRAS        519 (FAIR)
MEACHAM       216 (POOR)
PENDLETON     407 (FAIR)
REDMOND       620 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    556 (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.
$$