889
AUUS46 KPDT 141225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI AUG 14 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-6 MPH.          N 5-9 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        NW 5-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT AUG 15        POOR.
OUTLOOK FOR SUN AUG 16        FAIR.

VENTILATION INDEX (CATEGORY)  50 (POOR).          382 (FAIR).
OUTLOOK FOR SAT AUG 15        210 (POOR).
OUTLOOK FOR SUN AUG 16        281 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-5 MPH.         E 2-6 MPH.
TRANSPORT WINDS               N 5-10 MPH.         S 4-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SAT AUG 15        POOR.
OUTLOOK FOR SUN AUG 16        FAIR.

VENTILATION INDEX (CATEGORY)  69 (POOR).          269 (POOR).
OUTLOOK FOR SAT AUG 15        125 (POOR).
OUTLOOK FOR SUN AUG 16        391 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 0-2 MPH.         S 2-3 MPH.
TRANSPORT WINDS               S 3-5 MPH.          S 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT AUG 15        FAIR.
OUTLOOK FOR SUN AUG 16        GOOD.

VENTILATION INDEX (CATEGORY)  40 (POOR).          322 (FAIR).
OUTLOOK FOR SAT AUG 15        294 (POOR).
OUTLOOK FOR SUN AUG 16        347 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 1-4 MPH.          N 5-9 MPH.
TRANSPORT WINDS               S 4-6 MPH.          NW 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT AUG 15        POOR.
OUTLOOK FOR SUN AUG 16        FAIR.

VENTILATION INDEX (CATEGORY)  33 (POOR).          428 (FAIR).
OUTLOOK FOR SAT AUG 15        187 (POOR).
OUTLOOK FOR SUN AUG 16        279 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      150 (POOR)
ELLENSBURG    273 (POOR)
GOLDENDALE    337 (FAIR)
TRI-CITIES    319 (FAIR)
WALLA WALLA   368 (FAIR)
YAKIMA        319 (FAIR)
BEND          550 (FAIR)
PRINEVILLE    421 (FAIR)
ENTERPRISE    210 (POOR)
HERMISTON     335 (FAIR)
JOHN DAY      254 (POOR)
LA GRANDE     327 (FAIR)
MADRAS        338 (FAIR)
MEACHAM       320 (FAIR)
PENDLETON     435 (FAIR)
REDMOND       433 (FAIR)
SENECA        320 (FAIR)
THE DALLES    282 (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.
$$