173
AUUS46 KPDT 011225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT NOV  1 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-10 MPH.        SW 22-29 MPH.
TRANSPORT WINDS               S 6-12 MPH.         SW 21-29 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN NOV 2         FAIR.
OUTLOOK FOR MON NOV 3         POOR.

VENTILATION INDEX (CATEGORY)  46 (POOR).          313 (FAIR).
OUTLOOK FOR SUN NOV 2         244 (POOR).
OUTLOOK FOR MON NOV 3         148 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 2-6 MPH.          SW 20-28 MPH.
TRANSPORT WINDS               SE 5-10 MPH.        W 27-37 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN NOV 2         POOR.
OUTLOOK FOR MON NOV 3         POOR.

VENTILATION INDEX (CATEGORY)  53 (POOR).          598 (FAIR).
OUTLOOK FOR SUN NOV 2         135 (POOR).
OUTLOOK FOR MON NOV 3         91 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 13-21 MPH.        S 22-28 MPH.
TRANSPORT WINDS               S 15-21 MPH.        S 22-28 MPH.
MIXING HEIGHT                 4000 FT MSL.        5500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SUN NOV 2         FAIR.
OUTLOOK FOR MON NOV 3         FAIR.

VENTILATION INDEX (CATEGORY)  227 (POOR).         546 (FAIR).
OUTLOOK FOR SUN NOV 2         251 (POOR).
OUTLOOK FOR MON NOV 3         308 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 8-15 MPH.        S 20-29 MPH.
TRANSPORT WINDS               S 12-21 MPH.        SW 21-29 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SUN NOV 2         FAIR.
OUTLOOK FOR MON NOV 3         POOR.

VENTILATION INDEX (CATEGORY)  120 (POOR).         412 (FAIR).
OUTLOOK FOR SUN NOV 2         307 (FAIR).
OUTLOOK FOR MON NOV 3         167 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      539 (FAIR)
ELLENSBURG    279 (POOR)
GOLDENDALE    398 (FAIR)
TRI-CITIES    351 (FAIR)
WALLA WALLA   217 (POOR)
YAKIMA        487 (FAIR)
BEND         1050 (GOOD)
PRINEVILLE    922 (GOOD)
ENTERPRISE    392 (FAIR)
HERMISTON     185 (POOR)
JOHN DAY     1026 (GOOD)
LA GRANDE     402 (FAIR)
MADRAS       1050 (GOOD)
MEACHAM       249 (POOR)
PENDLETON     490 (FAIR)
REDMOND      1030 (GOOD)
SENECA        773 (GOOD)
THE DALLES    373 (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.
$$