132
AUUS46 KPDT 281221
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
521 AM PDT FRI MAR 28 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 7-13 MPH.         SW 14-21 MPH.
TRANSPORT WINDS               S 9-15 MPH.         W 19-27 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SAT MAR 29        GOOD.
OUTLOOK FOR SUN MAR 30        FAIR.

VENTILATION INDEX (CATEGORY)  101 (POOR).         951 (GOOD).
OUTLOOK FOR SAT MAR 29        664 (GOOD).
OUTLOOK FOR SUN MAR 30        330 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-9 MPH.          SW 16-22 MPH.
TRANSPORT WINDS               S 8-11 MPH.         SW 26-31 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT MAR 29        FAIR.
OUTLOOK FOR SUN MAR 30        FAIR.

VENTILATION INDEX (CATEGORY)  141 (POOR).         1043 (GOOD).
OUTLOOK FOR SAT MAR 29        357 (FAIR).
OUTLOOK FOR SUN MAR 30        355 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 11-15 MPH.        SW 7-10 MPH.
TRANSPORT WINDS               S 12-16 MPH.        SW 12-14 MPH.
MIXING HEIGHT                 4000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT MAR 29        GOOD.
OUTLOOK FOR SUN MAR 30        GOOD.

VENTILATION INDEX (CATEGORY)  238 (POOR).         463 (FAIR).
OUTLOOK FOR SAT MAR 29        506 (FAIR).
OUTLOOK FOR SUN MAR 30        640 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 9-15 MPH.         SW 10-20 MPH.
TRANSPORT WINDS               S 13-18 MPH.        W 14-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SAT MAR 29        FAIR.
OUTLOOK FOR SUN MAR 30        FAIR.

VENTILATION INDEX (CATEGORY)  170 (POOR).         642 (GOOD).
OUTLOOK FOR SAT MAR 29        614 (GOOD).
OUTLOOK FOR SUN MAR 30        447 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      676 (GOOD)
ELLENSBURG    874 (GOOD)
GOLDENDALE    849 (GOOD)
TRI-CITIES   1050 (GOOD)
WALLA WALLA   618 (GOOD)
YAKIMA       1019 (GOOD)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE    389 (FAIR)
HERMISTON    1050 (GOOD)
JOHN DAY     1015 (GOOD)
LA GRANDE     535 (FAIR)
MADRAS       1050 (GOOD)
MEACHAM       363 (FAIR)
PENDLETON     748 (GOOD)
REDMOND      1050 (GOOD)
SENECA        881 (GOOD)
THE DALLES    866 (GOOD)

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.
$$