227
AUUS46 KPDT 051325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST THU NOV  5 2026

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-12 MPH.         SW 6-11 MPH.
TRANSPORT WINDS               SW 7-13 MPH.        SW 10-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI NOV 6         POOR.
OUTLOOK FOR SAT NOV 7         POOR.

VENTILATION INDEX (CATEGORY)  46 (POOR).          329 (FAIR).
OUTLOOK FOR FRI NOV 6         35 (POOR).
OUTLOOK FOR SAT NOV 7         42 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 0-5 MPH.          SE 2-5 MPH.
TRANSPORT WINDS               W 3-8 MPH.          S 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI NOV 6         POOR.
OUTLOOK FOR SAT NOV 7         POOR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          53 (POOR).
OUTLOOK FOR FRI NOV 6         42 (POOR).
OUTLOOK FOR SAT NOV 7         39 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 1-3 MPH.         NW 1-4 MPH.
TRANSPORT WINDS               S 4-7 MPH.          W 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI NOV 6         POOR.
OUTLOOK FOR SAT NOV 7         GOOD.

VENTILATION INDEX (CATEGORY)  33 (POOR).          292 (POOR).
OUTLOOK FOR FRI NOV 6         212 (POOR).
OUTLOOK FOR SAT NOV 7         407 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-12 MPH.         SW 6-11 MPH.
TRANSPORT WINDS               SW 9-13 MPH.        SW 9-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI NOV 6         POOR.
OUTLOOK FOR SAT NOV 7         POOR.

VENTILATION INDEX (CATEGORY)  72 (POOR).          393 (FAIR).
OUTLOOK FOR FRI NOV 6         45 (POOR).
OUTLOOK FOR SAT NOV 7         78 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      289 (POOR)
ELLENSBURG    276 (POOR)
GOLDENDALE    282 (POOR)
TRI-CITIES    199 (POOR)
WALLA WALLA   365 (FAIR)
YAKIMA         52 (POOR)
BEND          157 (POOR)
PRINEVILLE     98 (POOR)
ENTERPRISE    213 (POOR)
HERMISTON     338 (FAIR)
JOHN DAY      268 (POOR)
LA GRANDE     353 (FAIR)
MADRAS        121 (POOR)
MEACHAM       303 (FAIR)
PENDLETON     468 (FAIR)
REDMOND        97 (POOR)
SENECA        300 (POOR)
THE DALLES    201 (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.
$$