349
AUUS46 KPDT 191225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT TUE AUG 19 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 5-11 MPH.         NW 7-10 MPH.
TRANSPORT WINDS               SW 7-12 MPH.        W 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 20        FAIR.
OUTLOOK FOR THU AUG 21        FAIR.

VENTILATION INDEX (CATEGORY)  96 (POOR).          288 (POOR).
OUTLOOK FOR WED AUG 20        387 (FAIR).
OUTLOOK FOR THU AUG 21        222 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          SE 4-8 MPH.
TRANSPORT WINDS               NW 5-9 MPH.         SW 6-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 20        POOR.
OUTLOOK FOR THU AUG 21        POOR.

VENTILATION INDEX (CATEGORY)  64 (POOR).          340 (FAIR).
OUTLOOK FOR WED AUG 20        288 (POOR).
OUTLOOK FOR THU AUG 21        218 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-5 MPH.         NW 7-9 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         W 7-9 MPH.
MIXING HEIGHT                 4000 FT MSL.        8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED AUG 20        GOOD.
OUTLOOK FOR THU AUG 21        GOOD.

VENTILATION INDEX (CATEGORY)  71 (POOR).          264 (POOR).
OUTLOOK FOR WED AUG 20        411 (FAIR).
OUTLOOK FOR THU AUG 21        289 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-10 MPH.         NW 7-9 MPH.
TRANSPORT WINDS               S 7-12 MPH.         W 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED AUG 20        FAIR.
OUTLOOK FOR THU AUG 21        FAIR.

VENTILATION INDEX (CATEGORY)  91 (POOR).          251 (POOR).
OUTLOOK FOR WED AUG 20        407 (FAIR).
OUTLOOK FOR THU AUG 21        286 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      524 (FAIR)
ELLENSBURG    549 (FAIR)
GOLDENDALE    502 (FAIR)
TRI-CITIES    252 (POOR)
WALLA WALLA   210 (POOR)
YAKIMA        380 (FAIR)
BEND          380 (FAIR)
PRINEVILLE    334 (FAIR)
ENTERPRISE    358 (FAIR)
HERMISTON     221 (POOR)
JOHN DAY      595 (FAIR)
LA GRANDE     296 (POOR)
MADRAS        269 (POOR)
MEACHAM       181 (POOR)
PENDLETON     277 (POOR)
REDMOND       347 (FAIR)
SENECA        893 (GOOD)
THE DALLES    539 (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.
$$