749
AUUS46 KPDT 061225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT SEP  6 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 3-8 MPH.          SW 7-10 MPH.
TRANSPORT WINDS               S 5-10 MPH.         E 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN SEP 7         FAIR.
OUTLOOK FOR MON SEP 8         FAIR.

VENTILATION INDEX (CATEGORY)  40 (POOR).          127 (POOR).
OUTLOOK FOR SUN SEP 7         557 (FAIR).
OUTLOOK FOR MON SEP 8         297 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-6 MPH.         SE 4-7 MPH.
TRANSPORT WINDS               NW 4-7 MPH.         SE 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN SEP 7         FAIR.
OUTLOOK FOR MON SEP 8         POOR.

VENTILATION INDEX (CATEGORY)  35 (POOR).          197 (POOR).
OUTLOOK FOR SUN SEP 7         338 (FAIR).
OUTLOOK FOR MON SEP 8         205 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-4 MPH.          S 5-5 MPH.
TRANSPORT WINDS               W 2-5 MPH.          S 7-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN SEP 7         GOOD.
OUTLOOK FOR MON SEP 8         GOOD.

VENTILATION INDEX (CATEGORY)  43 (POOR).          329 (FAIR).
OUTLOOK FOR SUN SEP 7         342 (FAIR).
OUTLOOK FOR MON SEP 8         653 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-8 MPH.         SW 5-9 MPH.
TRANSPORT WINDS               S 7-10 MPH.         SE 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN SEP 7         FAIR.
OUTLOOK FOR MON SEP 8         FAIR.

VENTILATION INDEX (CATEGORY)  58 (POOR).          251 (POOR).
OUTLOOK FOR SUN SEP 7         460 (FAIR).
OUTLOOK FOR MON SEP 8         230 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      247 (POOR)
ELLENSBURG    301 (FAIR)
GOLDENDALE    292 (POOR)
TRI-CITIES    123 (POOR)
WALLA WALLA   199 (POOR)
YAKIMA        234 (POOR)
BEND          556 (FAIR)
PRINEVILLE    525 (FAIR)
ENTERPRISE    312 (FAIR)
HERMISTON     102 (POOR)
JOHN DAY      453 (FAIR)
LA GRANDE     336 (FAIR)
MADRAS        212 (POOR)
MEACHAM       242 (POOR)
PENDLETON     212 (POOR)
REDMOND       534 (FAIR)
SENECA        669 (GOOD)
THE DALLES    220 (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.
$$