660
AUUS46 KPDT 031104
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
404 AM PDT THU APR 3 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 9-13 MPH.        W 7-10 MPH.
TRANSPORT WINDS               SW 10-15 MPH.       NW 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI APR 4         FAIR.
OUTLOOK FOR SAT APR 5         POOR.

VENTILATION INDEX (CATEGORY)  71 (POOR).          354 (FAIR).
OUTLOOK FOR FRI APR 4         197 (POOR).
OUTLOOK FOR SAT APR 5         106 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-7 MPH.          NW 3-6 MPH.
TRANSPORT WINDS               W 4-7 MPH.          N 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI APR 4         POOR.
OUTLOOK FOR SAT APR 5         POOR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          308 (FAIR).
OUTLOOK FOR FRI APR 4         201 (POOR).
OUTLOOK FOR SAT APR 5         123 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-5 MPH.          NW 11-18 MPH.
TRANSPORT WINDS               W 4-8 MPH.          NW 9-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI APR 4         FAIR.
OUTLOOK FOR SAT APR 5         FAIR.

VENTILATION INDEX (CATEGORY)  79 (POOR).          494 (FAIR).
OUTLOOK FOR FRI APR 4         378 (FAIR).
OUTLOOK FOR SAT APR 5         272 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 5-10 MPH.        W 8-13 MPH.
TRANSPORT WINDS               SW 10-15 MPH.       W 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR FRI APR 4         FAIR.
OUTLOOK FOR SAT APR 5         FAIR.

VENTILATION INDEX (CATEGORY)  107 (POOR).         376 (FAIR).
OUTLOOK FOR FRI APR 4         225 (POOR).
OUTLOOK FOR SAT APR 5         187 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      369 (FAIR)
ELLENSBURG    376 (FAIR)
GOLDENDALE    225 (POOR)
TRI-CITIES    324 (FAIR)
WALLA WALLA   332 (FAIR)
YAKIMA        322 (FAIR)
BEND          318 (FAIR)
PRINEVILLE    322 (FAIR)
ENTERPRISE    432 (FAIR)
HERMISTON     337 (FAIR)
JOHN DAY      525 (FAIR)
LA GRANDE     529 (FAIR)
MADRAS        311 (FAIR)
MEACHAM       391 (FAIR)
PENDLETON     384 (FAIR)
REDMOND       309 (FAIR)
SENECA        572 (FAIR)
THE DALLES    395 (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.
$$