064
AUUS46 KPDT 201225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN JUL 20 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 9-17 MPH.        W 10-13 MPH.
TRANSPORT WINDS               SW 10-18 MPH.       W 12-17 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR MON JUL 21        FAIR.
OUTLOOK FOR TUE JUL 22        FAIR.

VENTILATION INDEX (CATEGORY)  197 (POOR).         585 (FAIR).
OUTLOOK FOR MON JUL 21        348 (FAIR).
OUTLOOK FOR TUE JUL 22        483 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          W 5-9 MPH.
TRANSPORT WINDS               W 4-8 MPH.          W 6-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON JUL 21        FAIR.
OUTLOOK FOR TUE JUL 22        POOR.

VENTILATION INDEX (CATEGORY)  80 (POOR).          354 (FAIR).
OUTLOOK FOR MON JUL 21        326 (FAIR).
OUTLOOK FOR TUE JUL 22        270 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-4 MPH.         NW 6-8 MPH.
TRANSPORT WINDS               SW 4-9 MPH.         W 11-13 MPH.
MIXING HEIGHT                 4000 FT MSL.        10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR MON JUL 21        FAIR.
OUTLOOK FOR TUE JUL 22        GOOD.

VENTILATION INDEX (CATEGORY)  132 (POOR).         614 (GOOD).
OUTLOOK FOR MON JUL 21        290 (POOR).
OUTLOOK FOR TUE JUL 22        472 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 8-19 MPH.        W 8-14 MPH.
TRANSPORT WINDS               SW 11-18 MPH.       W 12-18 MPH.
MIXING HEIGHT                 2000 FT MSL.        6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR MON JUL 21        FAIR.
OUTLOOK FOR TUE JUL 22        FAIR.

VENTILATION INDEX (CATEGORY)  267 (POOR).         653 (GOOD).
OUTLOOK FOR MON JUL 21        308 (FAIR).
OUTLOOK FOR TUE JUL 22        471 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      536 (FAIR)
ELLENSBURG    572 (FAIR)
GOLDENDALE    520 (FAIR)
TRI-CITIES    394 (FAIR)
WALLA WALLA   671 (GOOD)
YAKIMA        426 (FAIR)
BEND          475 (FAIR)
PRINEVILLE    435 (FAIR)
ENTERPRISE    774 (GOOD)
HERMISTON     663 (GOOD)
JOHN DAY      618 (GOOD)
LA GRANDE     723 (GOOD)
MADRAS        398 (FAIR)
MEACHAM       430 (FAIR)
PENDLETON     696 (GOOD)
REDMOND       513 (FAIR)
SENECA        755 (GOOD)
THE DALLES    662 (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.
$$