422
AUUS46 KPDT 161154
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
454 AM PDT FRI MAY 16 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 8-15 MPH.        SW 9-13 MPH.
TRANSPORT WINDS               SW 12-20 MPH.       SW 12-16 MPH.
MIXING HEIGHT                 2000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SAT MAY 17        FAIR.
OUTLOOK FOR SUN MAY 18        FAIR.

VENTILATION INDEX (CATEGORY)  215 (POOR).         678 (GOOD).
OUTLOOK FOR SAT MAY 17        364 (FAIR).
OUTLOOK FOR SUN MAY 18        886 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-8 MPH.          SW 5-9 MPH.
TRANSPORT WINDS               W 3-8 MPH.          W 5-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT MAY 17        FAIR.
OUTLOOK FOR SUN MAY 18        GOOD.

VENTILATION INDEX (CATEGORY)  86 (POOR).          323 (FAIR).
OUTLOOK FOR SAT MAY 17        259 (POOR).
OUTLOOK FOR SUN MAY 18        934 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-5 MPH.          W 5-6 MPH.
TRANSPORT WINDS               W 5-9 MPH.          W 7-9 MPH.
MIXING HEIGHT                 4500 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT MAY 17        FAIR.
OUTLOOK FOR SUN MAY 18        GOOD.

VENTILATION INDEX (CATEGORY)  115 (POOR).         268 (POOR).
OUTLOOK FOR SAT MAY 17        190 (POOR).
OUTLOOK FOR SUN MAY 18        621 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 8-15 MPH.        SW 7-12 MPH.
TRANSPORT WINDS               SW 12-16 MPH.       SW 11-14 MPH.
MIXING HEIGHT                 2000 FT MSL.        6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SAT MAY 17        FAIR.
OUTLOOK FOR SUN MAY 18        GOOD.

VENTILATION INDEX (CATEGORY)  211 (POOR).         515 (FAIR).
OUTLOOK FOR SAT MAY 17        297 (POOR).
OUTLOOK FOR SUN MAY 18        828 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      485 (FAIR)
ELLENSBURG    751 (GOOD)
GOLDENDALE    555 (FAIR)
TRI-CITIES    657 (GOOD)
WALLA WALLA   508 (FAIR)
YAKIMA        247 (POOR)
BEND          178 (POOR)
PRINEVILLE    224 (POOR)
ENTERPRISE    232 (POOR)
HERMISTON     759 (GOOD)
JOHN DAY      292 (POOR)
LA GRANDE     353 (FAIR)
MADRAS        185 (POOR)
MEACHAM       305 (FAIR)
PENDLETON     632 (GOOD)
REDMOND       242 (POOR)
SENECA        317 (FAIR)
THE DALLES    585 (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.
$$