932
AUUS46 KPDT 161225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT WED JUL 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                 W 3-8 MPH.          NW 4-7 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        NW 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU JUL 17        GOOD.
OUTLOOK FOR FRI JUL 18        GOOD.

VENTILATION INDEX (CATEGORY)  70 (POOR).          253 (POOR).
OUTLOOK FOR THU JUL 17        718 (GOOD).
OUTLOOK FOR FRI JUL 18        902 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 4-8 MPH.         SE 4-8 MPH.
TRANSPORT WINDS               NW 6-11 MPH.        SW 4-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU JUL 17        FAIR.
OUTLOOK FOR FRI JUL 18        FAIR.

VENTILATION INDEX (CATEGORY)  113 (POOR).         167 (POOR).
OUTLOOK FOR THU JUL 17        366 (FAIR).
OUTLOOK FOR FRI JUL 18        508 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-4 MPH.         NW 5-7 MPH.
TRANSPORT WINDS               NW 5-7 MPH.         NW 6-7 MPH.
MIXING HEIGHT                 4000 FT MSL.        9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU JUL 17        GOOD.
OUTLOOK FOR FRI JUL 18        GOOD.

VENTILATION INDEX (CATEGORY)  103 (POOR).         316 (FAIR).
OUTLOOK FOR THU JUL 17        815 (GOOD).
OUTLOOK FOR FRI JUL 18        906 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 2-6 MPH.         NW 6-8 MPH.
TRANSPORT WINDS               SW 5-7 MPH.         NW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU JUL 17        GOOD.
OUTLOOK FOR FRI JUL 18        GOOD.

VENTILATION INDEX (CATEGORY)  67 (POOR).          264 (POOR).
OUTLOOK FOR THU JUL 17        824 (GOOD).
OUTLOOK FOR FRI JUL 18        899 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      194 (POOR)
ELLENSBURG    269 (POOR)
GOLDENDALE    208 (POOR)
TRI-CITIES    215 (POOR)
WALLA WALLA   216 (POOR)
YAKIMA        240 (POOR)
BEND          291 (POOR)
PRINEVILLE    266 (POOR)
ENTERPRISE    358 (FAIR)
HERMISTON     168 (POOR)
JOHN DAY      344 (FAIR)
LA GRANDE     321 (FAIR)
MADRAS        251 (POOR)
MEACHAM       210 (POOR)
PENDLETON     263 (POOR)
REDMOND       292 (POOR)
SENECA        402 (FAIR)
THE DALLES    353 (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.
$$