492
AUUS46 KPDT 011135
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
435 AM PDT TUE APR 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                 S 7-12 MPH.         W 10-12 MPH.
TRANSPORT WINDS               SW 8-11 MPH.        W 10-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED APR 2         GOOD.
OUTLOOK FOR THU APR 3         POOR.

VENTILATION INDEX (CATEGORY)  43 (POOR).          506 (FAIR).
OUTLOOK FOR WED APR 2         777 (GOOD).
OUTLOOK FOR THU APR 3         349 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-6 MPH.          W 7-12 MPH.
TRANSPORT WINDS               W 3-6 MPH.          NW 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED APR 2         FAIR.
OUTLOOK FOR THU APR 3         POOR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          382 (FAIR).
OUTLOOK FOR WED APR 2         406 (FAIR).
OUTLOOK FOR THU APR 3         215 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 1-4 MPH.          NW 7-11 MPH.
TRANSPORT WINDS               SW 3-6 MPH.         W 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 2         FAIR.
OUTLOOK FOR THU APR 3         GOOD.

VENTILATION INDEX (CATEGORY)  41 (POOR).          367 (FAIR).
OUTLOOK FOR WED APR 2         492 (FAIR).
OUTLOOK FOR THU APR 3         490 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-10 MPH.         W 10-15 MPH.
TRANSPORT WINDS               SW 10-15 MPH.        W 11-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED APR 2         GOOD.
OUTLOOK FOR THU APR 3         FAIR.

VENTILATION INDEX (CATEGORY)  80 (POOR).          546 (FAIR).
OUTLOOK FOR WED APR 2         812 (GOOD).
OUTLOOK FOR THU APR 3         367 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      518 (FAIR)
ELLENSBURG    579 (FAIR)
GOLDENDALE    317 (FAIR)
TRI-CITIES    417 (FAIR)
WALLA WALLA   534 (FAIR)
YAKIMA        470 (FAIR)
BEND          369 (FAIR)
PRINEVILLE    356 (FAIR)
ENTERPRISE    407 (FAIR)
HERMISTON     460 (FAIR)
JOHN DAY      183 (POOR)
LA GRANDE     413 (FAIR)
MADRAS        334 (FAIR)
MEACHAM       463 (FAIR)
PENDLETON     552 (FAIR)
REDMOND       361 (FAIR)
SENECA        143 (POOR)
THE DALLES    498 (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.
$$