934
AUUS46 KPDT 231325
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PST SUN NOV 23 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 3-10 MPH.         SW 8-15 MPH.
TRANSPORT WINDS               S 6-12 MPH.         SW 7-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       NEAR SURFACE.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON NOV 24        GOOD.
OUTLOOK FOR TUE NOV 25        POOR.

VENTILATION INDEX (CATEGORY)  37 (POOR).          71 (POOR).
OUTLOOK FOR MON NOV 24        473 (FAIR).
OUTLOOK FOR TUE NOV 25        41 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 1-5 MPH.         SW 4-12 MPH.
TRANSPORT WINDS               S 2-6 MPH.          SW 4-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON NOV 24        FAIR.
OUTLOOK FOR TUE NOV 25        POOR.

VENTILATION INDEX (CATEGORY)  29 (POOR).          71 (POOR).
OUTLOOK FOR MON NOV 24        190 (POOR).
OUTLOOK FOR TUE NOV 25        48 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 11-16 MPH.        S 8-13 MPH.
TRANSPORT WINDS               S 13-17 MPH.        S 10-13 MPH.
MIXING HEIGHT                 4000 FT MSL.        5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON NOV 24        GOOD.
OUTLOOK FOR TUE NOV 25        FAIR.

VENTILATION INDEX (CATEGORY)  149 (POOR).         222 (POOR).
OUTLOOK FOR MON NOV 24        829 (GOOD).
OUTLOOK FOR TUE NOV 25        311 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-11 MPH.         SW 5-15 MPH.
TRANSPORT WINDS               S 7-13 MPH.         S 5-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON NOV 24        GOOD.
OUTLOOK FOR TUE NOV 25        POOR.

VENTILATION INDEX (CATEGORY)  51 (POOR).          84 (POOR).
OUTLOOK FOR MON NOV 24        623 (GOOD).
OUTLOOK FOR TUE NOV 25        107 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      270 (POOR)
ELLENSBURG    141 (POOR)
GOLDENDALE    182 (POOR)
TRI-CITIES     97 (POOR)
WALLA WALLA    61 (POOR)
YAKIMA         46 (POOR)
BEND          217 (POOR)
PRINEVILLE     70 (POOR)
ENTERPRISE     94 (POOR)
HERMISTON      42 (POOR)
JOHN DAY      139 (POOR)
LA GRANDE     167 (POOR)
MADRAS        148 (POOR)
MEACHAM        93 (POOR)
PENDLETON      46 (POOR)
REDMOND        79 (POOR)
SENECA        167 (POOR)
THE DALLES    130 (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.
$$