429
AUUS46 KPDT 041114
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
414 AM PDT FRI APR 4 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 2-6 MPH.          N 6-10 MPH.
TRANSPORT WINDS               S 2-6 MPH.          NE 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT APR 5         POOR.
OUTLOOK FOR SUN APR 6         FAIR.

VENTILATION INDEX (CATEGORY)  30 (POOR).          321 (FAIR).
OUTLOOK FOR SAT APR 5         110 (POOR).
OUTLOOK FOR SUN APR 6         136 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-7 MPH.         E 4-8 MPH.
TRANSPORT WINDS               NW 2-7 MPH.         E 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT APR 5         POOR.
OUTLOOK FOR SUN APR 6         FAIR.

VENTILATION INDEX (CATEGORY)  42 (POOR).          299 (POOR).
OUTLOOK FOR SAT APR 5         137 (POOR).
OUTLOOK FOR SUN APR 6         176 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-5 MPH.         N 6-10 MPH.
TRANSPORT WINDS               N 5-7 MPH.          NE 9-10 MPH.
MIXING HEIGHT                 4000 FT MSL.        8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT APR 5         FAIR.
OUTLOOK FOR SUN APR 6         GOOD.

VENTILATION INDEX (CATEGORY)  92 (POOR).          428 (FAIR).
OUTLOOK FOR SAT APR 5         493 (FAIR).
OUTLOOK FOR SUN APR 6         483 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-7 MPH.         N 7-12 MPH.
TRANSPORT WINDS               SE 2-7 MPH.         NE 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT APR 5         FAIR.
OUTLOOK FOR SUN APR 6         FAIR.

VENTILATION INDEX (CATEGORY)  48 (POOR).          359 (FAIR).
OUTLOOK FOR SAT APR 5         223 (POOR).
OUTLOOK FOR SUN APR 6         285 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      439 (FAIR)
ELLENSBURG    354 (FAIR)
GOLDENDALE    457 (FAIR)
TRI-CITIES    259 (POOR)
WALLA WALLA   309 (FAIR)
YAKIMA        297 (POOR)
BEND          342 (FAIR)
PRINEVILLE    324 (FAIR)
ENTERPRISE    281 (POOR)
HERMISTON     306 (FAIR)
JOHN DAY      389 (FAIR)
LA GRANDE     405 (FAIR)
MADRAS        365 (FAIR)
MEACHAM       303 (FAIR)
PENDLETON     355 (FAIR)
REDMOND       320 (FAIR)
SENECA        304 (FAIR)
THE DALLES    486 (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.
$$