597
AUUS46 KPDT 141225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE OCT 14 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-10 MPH.         N 4-8 MPH.
TRANSPORT WINDS               NW 4-11 MPH.        N 4-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED OCT 15        POOR.
OUTLOOK FOR THU OCT 16        FAIR.

VENTILATION INDEX (CATEGORY)  40 (POOR).          132 (POOR).
OUTLOOK FOR WED OCT 15        114 (POOR).
OUTLOOK FOR THU OCT 16        267 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 5-13 MPH.        NE 6-11 MPH.
TRANSPORT WINDS               NW 6-14 MPH.        NE 8-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED OCT 15        POOR.
OUTLOOK FOR THU OCT 16        FAIR.

VENTILATION INDEX (CATEGORY)  76 (POOR).          367 (FAIR).
OUTLOOK FOR WED OCT 15        84 (POOR).
OUTLOOK FOR THU OCT 16        100 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 6-14 MPH.        NW 7-9 MPH.
TRANSPORT WINDS               N 8-14 MPH.         N 9-11 MPH.
MIXING HEIGHT                 4000 FT MSL.        6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED OCT 15        FAIR.
OUTLOOK FOR THU OCT 16        FAIR.

VENTILATION INDEX (CATEGORY)  134 (POOR).         340 (FAIR).
OUTLOOK FOR WED OCT 15        371 (FAIR).
OUTLOOK FOR THU OCT 16        259 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 2-6 MPH.         W 4-6 MPH.
TRANSPORT WINDS               SW 3-6 MPH.         N 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED OCT 15        FAIR.
OUTLOOK FOR THU OCT 16        FAIR.

VENTILATION INDEX (CATEGORY)  37 (POOR).          106 (POOR).
OUTLOOK FOR WED OCT 15        148 (POOR).
OUTLOOK FOR THU OCT 16        306 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      412 (FAIR)
ELLENSBURG    283 (POOR)
GOLDENDALE    430 (FAIR)
TRI-CITIES    252 (POOR)
WALLA WALLA    67 (POOR)
YAKIMA        446 (FAIR)
BEND          198 (POOR)
PRINEVILLE    234 (POOR)
ENTERPRISE    204 (POOR)
HERMISTON     131 (POOR)
JOHN DAY      241 (POOR)
LA GRANDE     272 (POOR)
MADRAS        364 (FAIR)
MEACHAM       100 (POOR)
PENDLETON     142 (POOR)
REDMOND       302 (FAIR)
SENECA        263 (POOR)
THE DALLES    314 (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.
$$