190
AUUS46 KPDT 161225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT AUG 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                 S 6-15 MPH.         SW 9-16 MPH.
TRANSPORT WINDS               SW 6-15 MPH.        SW 10-17 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN AUG 17        FAIR.
OUTLOOK FOR MON AUG 18        FAIR.

VENTILATION INDEX (CATEGORY)  89 (POOR).          295 (POOR).
OUTLOOK FOR SUN AUG 17        433 (FAIR).
OUTLOOK FOR MON AUG 18        323 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 5-11 MPH.        SW 11-16 MPH.
TRANSPORT WINDS               SW 6-12 MPH.        SW 13-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN AUG 17        FAIR.
OUTLOOK FOR MON AUG 18        GOOD.

VENTILATION INDEX (CATEGORY)  122 (POOR).         845 (GOOD).
OUTLOOK FOR SUN AUG 17        301 (FAIR).
OUTLOOK FOR MON AUG 18        487 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 2-5 MPH.         NW 5-7 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         NW 8-10 MPH.
MIXING HEIGHT                 4000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN AUG 17        GOOD.
OUTLOOK FOR MON AUG 18        GOOD.

VENTILATION INDEX (CATEGORY)  95 (POOR).          337 (FAIR).
OUTLOOK FOR SUN AUG 17        260 (POOR).
OUTLOOK FOR MON AUG 18        597 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-14 MPH.         SW 5-13 MPH.
TRANSPORT WINDS               SW 5-13 MPH.        SW 7-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN AUG 17        FAIR.
OUTLOOK FOR MON AUG 18        FAIR.

VENTILATION INDEX (CATEGORY)  107 (POOR).         191 (POOR).
OUTLOOK FOR SUN AUG 17        310 (FAIR).
OUTLOOK FOR MON AUG 18        275 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      586 (FAIR)
ELLENSBURG    652 (GOOD)
GOLDENDALE    818 (GOOD)
TRI-CITIES    454 (FAIR)
WALLA WALLA   224 (POOR)
YAKIMA        590 (FAIR)
BEND          232 (POOR)
PRINEVILLE    187 (POOR)
ENTERPRISE    337 (FAIR)
HERMISTON     306 (FAIR)
JOHN DAY      539 (FAIR)
LA GRANDE     334 (FAIR)
MADRAS        331 (FAIR)
MEACHAM       129 (POOR)
PENDLETON     184 (POOR)
REDMOND       229 (POOR)
SENECA        521 (FAIR)
THE DALLES    780 (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.
$$