561
AUUS46 KPDT 171225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI JUL 17 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 8-19 MPH.        W 8-13 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       W 8-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SAT JUL 18        FAIR.
OUTLOOK FOR SUN JUL 19        FAIR.

VENTILATION INDEX (CATEGORY)  172 (POOR).         387 (FAIR).
OUTLOOK FOR SAT JUL 18        530 (FAIR).
OUTLOOK FOR SUN JUL 19        348 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-8 MPH.         SW 6-12 MPH.
TRANSPORT WINDS               W 4-9 MPH.          SW 8-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUL 18        FAIR.
OUTLOOK FOR SUN JUL 19        FAIR.

VENTILATION INDEX (CATEGORY)  53 (POOR).          373 (FAIR).
OUTLOOK FOR SAT JUL 18        414 (FAIR).
OUTLOOK FOR SUN JUL 19        214 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-6 MPH.         NW 6-8 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         W 8-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUL 18        GOOD.
OUTLOOK FOR SUN JUL 19        GOOD.

VENTILATION INDEX (CATEGORY)  55 (POOR).          213 (POOR).
OUTLOOK FOR SAT JUL 18        469 (FAIR).
OUTLOOK FOR SUN JUL 19        413 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-14 MPH.         NW 7-10 MPH.
TRANSPORT WINDS               SW 8-18 MPH.        W 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SAT JUL 18        FAIR.
OUTLOOK FOR SUN JUL 19        FAIR.

VENTILATION INDEX (CATEGORY)  119 (POOR).         280 (POOR).
OUTLOOK FOR SAT JUL 18        440 (FAIR).
OUTLOOK FOR SUN JUL 19        347 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      354 (FAIR)
ELLENSBURG    465 (FAIR)
GOLDENDALE    520 (FAIR)
TRI-CITIES    361 (FAIR)
WALLA WALLA   319 (FAIR)
YAKIMA        464 (FAIR)
BEND          479 (FAIR)
PRINEVILLE    462 (FAIR)
ENTERPRISE    298 (POOR)
HERMISTON     403 (FAIR)
JOHN DAY      576 (FAIR)
LA GRANDE     234 (POOR)
MADRAS        292 (POOR)
MEACHAM       206 (POOR)
PENDLETON     315 (FAIR)
REDMOND       403 (FAIR)
SENECA       1024 (GOOD)
THE DALLES    482 (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.
$$