455
AUUS46 KPDT 021225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI OCT  2 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 0-5 MPH.         W 4-8 MPH.
TRANSPORT WINDS               S 3-6 MPH.          W 8-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT OCT 3         FAIR.
OUTLOOK FOR SUN OCT 4         POOR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          196 (POOR).
OUTLOOK FOR SAT OCT 3         157 (POOR).
OUTLOOK FOR SUN OCT 4         83 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-3 MPH.         SE 2-5 MPH.
TRANSPORT WINDS               W 2-5 MPH.          SW 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT OCT 3         POOR.
OUTLOOK FOR SUN OCT 4         POOR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          133 (POOR).
OUTLOOK FOR SAT OCT 3         136 (POOR).
OUTLOOK FOR SUN OCT 4         52 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 0-2 MPH.         NW 2-4 MPH.
TRANSPORT WINDS               S 4-5 MPH.          W 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT OCT 3         FAIR.
OUTLOOK FOR SUN OCT 4         FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          267 (POOR).
OUTLOOK FOR SAT OCT 3         136 (POOR).
OUTLOOK FOR SUN OCT 4         236 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-5 MPH.          W 3-6 MPH.
TRANSPORT WINDS               S 5-7 MPH.          W 8-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT OCT 3         POOR.
OUTLOOK FOR SUN OCT 4         POOR.

VENTILATION INDEX (CATEGORY)  29 (POOR).          216 (POOR).
OUTLOOK FOR SAT OCT 3         122 (POOR).
OUTLOOK FOR SUN OCT 4         79 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      361 (FAIR)
ELLENSBURG    281 (POOR)
GOLDENDALE    365 (FAIR)
TRI-CITIES    207 (POOR)
WALLA WALLA   195 (POOR)
YAKIMA        109 (POOR)
BEND          197 (POOR)
PRINEVILLE    168 (POOR)
ENTERPRISE    367 (FAIR)
HERMISTON     179 (POOR)
JOHN DAY      275 (POOR)
LA GRANDE     334 (FAIR)
MADRAS        137 (POOR)
MEACHAM       233 (POOR)
PENDLETON     168 (POOR)
REDMOND       159 (POOR)
SENECA        374 (FAIR)
THE DALLES    300 (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.
$$