773
AUUS46 KPDT 021225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE SEP  2 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 2-8 MPH.          N 4-8 MPH.
TRANSPORT WINDS               S 5-10 MPH.         W 4-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED SEP 3         FAIR.
OUTLOOK FOR THU SEP 4         FAIR.

VENTILATION INDEX (CATEGORY)  43 (POOR).          142 (POOR).
OUTLOOK FOR WED SEP 3         135 (POOR).
OUTLOOK FOR THU SEP 4         280 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-6 MPH.         E 3-6 MPH.
TRANSPORT WINDS               NW 4-9 MPH.         S 4-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED SEP 3         POOR.
OUTLOOK FOR THU SEP 4         FAIR.

VENTILATION INDEX (CATEGORY)  35 (POOR).          182 (POOR).
OUTLOOK FOR WED SEP 3         181 (POOR).
OUTLOOK FOR THU SEP 4         176 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-5 MPH.          NW 3-4 MPH.
TRANSPORT WINDS               S 3-6 MPH.          S 4-8 MPH.
MIXING HEIGHT                 4000 FT MSL.        15000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED SEP 3         GOOD.
OUTLOOK FOR THU SEP 4         GOOD.

VENTILATION INDEX (CATEGORY)  48 (POOR).          576 (FAIR).
OUTLOOK FOR WED SEP 3         143 (POOR).
OUTLOOK FOR THU SEP 4         373 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-9 MPH.          NW 5-7 MPH.
TRANSPORT WINDS               S 5-10 MPH.         NW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 3         FAIR.
OUTLOOK FOR THU SEP 4         FAIR.

VENTILATION INDEX (CATEGORY)  43 (POOR).          161 (POOR).
OUTLOOK FOR WED SEP 3         182 (POOR).
OUTLOOK FOR THU SEP 4         320 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      724 (GOOD)
ELLENSBURG    420 (FAIR)
GOLDENDALE    179 (POOR)
TRI-CITIES     97 (POOR)
WALLA WALLA   123 (POOR)
YAKIMA        222 (POOR)
BEND          926 (GOOD)
PRINEVILLE    729 (GOOD)
ENTERPRISE    490 (FAIR)
HERMISTON      98 (POOR)
JOHN DAY      587 (FAIR)
LA GRANDE     540 (FAIR)
MADRAS        522 (FAIR)
MEACHAM       203 (POOR)
PENDLETON     176 (POOR)
REDMOND       746 (GOOD)
SENECA        700 (GOOD)
THE DALLES    119 (POOR)

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.
$$