831
AUUS46 KPDT 221225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI AUG 22 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 2-6 MPH.         N 6-11 MPH.
TRANSPORT WINDS               NW 4-9 MPH.         NE 6-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT AUG 23        FAIR.
OUTLOOK FOR SUN AUG 24        FAIR.

VENTILATION INDEX (CATEGORY)  37 (POOR).          281 (POOR).
OUTLOOK FOR SAT AUG 23        166 (POOR).
OUTLOOK FOR SUN AUG 24        170 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 4-8 MPH.         NE 6-10 MPH.
TRANSPORT WINDS               NW 7-13 MPH.        NE 6-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT AUG 23        FAIR.
OUTLOOK FOR SUN AUG 24        FAIR.

VENTILATION INDEX (CATEGORY)  88 (POOR).          445 (FAIR).
OUTLOOK FOR SAT AUG 23        313 (FAIR).
OUTLOOK FOR SUN AUG 24        288 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 2-4 MPH.          N 4-5 MPH.
TRANSPORT WINDS               N 4-9 MPH.          N 5-6 MPH.
MIXING HEIGHT                 4000 FT MSL.        10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT AUG 23        GOOD.
OUTLOOK FOR SUN AUG 24        GOOD.

VENTILATION INDEX (CATEGORY)  66 (POOR).          285 (POOR).
OUTLOOK FOR SAT AUG 23        217 (POOR).
OUTLOOK FOR SUN AUG 24        279 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-8 MPH.         N 6-8 MPH.
TRANSPORT WINDS               SE 5-9 MPH.         NE 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT AUG 23        FAIR.
OUTLOOK FOR SUN AUG 24        FAIR.

VENTILATION INDEX (CATEGORY)  31 (POOR).          267 (POOR).
OUTLOOK FOR SAT AUG 23        155 (POOR).
OUTLOOK FOR SUN AUG 24        167 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      738 (GOOD)
ELLENSBURG    638 (GOOD)
GOLDENDALE    641 (GOOD)
TRI-CITIES    297 (POOR)
WALLA WALLA   190 (POOR)
YAKIMA        442 (FAIR)
BEND          360 (FAIR)
PRINEVILLE    291 (POOR)
ENTERPRISE    230 (POOR)
HERMISTON     303 (FAIR)
JOHN DAY      322 (FAIR)
LA GRANDE     268 (POOR)
MADRAS        404 (FAIR)
MEACHAM       226 (POOR)
PENDLETON     320 (FAIR)
REDMOND       377 (FAIR)
SENECA        379 (FAIR)
THE DALLES    602 (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.
$$