576
AUUS46 KPDT 021111
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
411 AM PDT WED APR 2 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 11-17 MPH.        SW 13-19 MPH.
TRANSPORT WINDS               SW 11-16 MPH.        SW 13-19 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU APR 3         FAIR.
OUTLOOK FOR FRI APR 4         POOR.

VENTILATION INDEX (CATEGORY)  88 (POOR).          631 (GOOD).
OUTLOOK FOR THU APR 3         294 (POOR).
OUTLOOK FOR FRI APR 4         184 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-7 MPH.          W 6-10 MPH.
TRANSPORT WINDS               W 4-8 MPH.          W 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU APR 3         POOR.
OUTLOOK FOR FRI APR 4         POOR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          421 (FAIR).
OUTLOOK FOR THU APR 3         207 (POOR).
OUTLOOK FOR FRI APR 4         183 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 4-7 MPH.         NW 11-15 MPH.
TRANSPORT WINDS                W 6-9 MPH.         NW 11-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU APR 3         FAIR.
OUTLOOK FOR FRI APR 4         GOOD.

VENTILATION INDEX (CATEGORY)  97 (POOR).          477 (FAIR).
OUTLOOK FOR THU APR 3         416 (FAIR).
OUTLOOK FOR FRI APR 4         393 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 11-16 MPH.        SW 12-19 MPH.
TRANSPORT WINDS               SW 11-17 MPH.         W 11-17 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR THU APR 3         FAIR.
OUTLOOK FOR FRI APR 4         POOR.

VENTILATION INDEX (CATEGORY)  138 (POOR).         604 (GOOD).
OUTLOOK FOR THU APR 3         347 (FAIR).
OUTLOOK FOR FRI APR 4         237 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      626 (GOOD)
ELLENSBURG    745 (GOOD)
GOLDENDALE    827 (GOOD)
TRI-CITIES    522 (FAIR)
WALLA WALLA   555 (FAIR)
YAKIMA        475 (FAIR)
BEND          347 (FAIR)
PRINEVILLE    658 (GOOD)
ENTERPRISE    425 (FAIR)
HERMISTON     689 (GOOD)
JOHN DAY      424 (FAIR)
LA GRANDE     589 (FAIR)
MADRAS        536 (FAIR)
MEACHAM       474 (FAIR)
PENDLETON     739 (GOOD)
REDMOND       704 (GOOD)
SENECA        473 (FAIR)
THE DALLES   1034 (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.
$$