387
AUUS46 KPDT 061124
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
424 AM PDT TUE MAY 6 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 3-7 MPH.         NE 5-10 MPH.
TRANSPORT WINDS               NE 3-7 MPH.         NE 6-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED MAY 7         FAIR.
OUTLOOK FOR THU MAY 8         FAIR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          422 (FAIR).
OUTLOOK FOR WED MAY 7         315 (FAIR).
OUTLOOK FOR THU MAY 8         367 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-6 MPH.         E 5-10 MPH.
TRANSPORT WINDS               NE 4-8 MPH.         E 7-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED MAY 7         GOOD.
OUTLOOK FOR THU MAY 8         POOR.

VENTILATION INDEX (CATEGORY)  35 (POOR).          588 (FAIR).
OUTLOOK FOR WED MAY 7         404 (FAIR).
OUTLOOK FOR THU MAY 8         173 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 6-12 MPH.         E 4-7 MPH.
TRANSPORT WINDS               N 6-12 MPH.         SE 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED MAY 7         GOOD.
OUTLOOK FOR THU MAY 8         GOOD.

VENTILATION INDEX (CATEGORY)  91 (POOR).          191 (POOR).
OUTLOOK FOR WED MAY 7         775 (GOOD).
OUTLOOK FOR THU MAY 8         388 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 3-8 MPH.          N 5-10 MPH.
TRANSPORT WINDS               E 6-12 MPH.         NE 6-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED MAY 7         FAIR.
OUTLOOK FOR THU MAY 8         FAIR.

VENTILATION INDEX (CATEGORY)  49 (POOR).          316 (FAIR).
OUTLOOK FOR WED MAY 7         380 (FAIR).
OUTLOOK FOR THU MAY 8         292 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      561 (FAIR)
ELLENSBURG    525 (FAIR)
GOLDENDALE    660 (GOOD)
TRI-CITIES    685 (GOOD)
WALLA WALLA   288 (POOR)
YAKIMA        502 (FAIR)
BEND          224 (POOR)
PRINEVILLE    244 (POOR)
ENTERPRISE    199 (POOR)
HERMISTON     418 (FAIR)
JOHN DAY      215 (POOR)
LA GRANDE     213 (POOR)
MADRAS        416 (FAIR)
MEACHAM       280 (POOR)
PENDLETON     240 (POOR)
REDMOND       253 (POOR)
SENECA        234 (POOR)
THE DALLES    608 (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.
$$