679
AUUS46 KPDT 111128
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
428 AM PDT TUE MAR 11 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 5-10 MPH.         NW 4-7 MPH.
TRANSPORT WINDS               SW 5-10 MPH.        W 1-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED MAR 12        FAIR.
OUTLOOK FOR THU MAR 13        GOOD.

VENTILATION INDEX (CATEGORY)  26 (POOR).          70 (POOR).
OUTLOOK FOR WED MAR 12        247 (POOR).
OUTLOOK FOR THU MAR 13        988 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 1-5 MPH.          SE 1-5 MPH.
TRANSPORT WINDS               NW 1-5 MPH.         S 1-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED MAR 12        FAIR.
OUTLOOK FOR THU MAR 13        GOOD.

VENTILATION INDEX (CATEGORY)  25 (POOR).          65 (POOR).
OUTLOOK FOR WED MAR 12        141 (POOR).
OUTLOOK FOR THU MAR 13        1046 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 1-5 MPH.          S 7-13 MPH.
TRANSPORT WINDS               S 2-6 MPH.          S 10-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED MAR 12        GOOD.
OUTLOOK FOR THU MAR 13        GOOD.

VENTILATION INDEX (CATEGORY)  25 (POOR).          329 (FAIR).
OUTLOOK FOR WED MAR 12        408 (FAIR).
OUTLOOK FOR THU MAR 13        670 (GOOD).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-10 MPH.         NW 5-10 MPH.
TRANSPORT WINDS               SW 5-15 MPH.        SW 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED MAR 12        GOOD.
OUTLOOK FOR THU MAR 13        GOOD.

VENTILATION INDEX (CATEGORY)  39 (POOR).          155 (POOR).
OUTLOOK FOR WED MAR 12        409 (FAIR).
OUTLOOK FOR THU MAR 13        927 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       53 (POOR)
ELLENSBURG    117 (POOR)
GOLDENDALE     71 (POOR)
TRI-CITIES     84 (POOR)
WALLA WALLA    81 (POOR)
YAKIMA         78 (POOR)
BEND          447 (FAIR)
PRINEVILLE    410 (FAIR)
ENTERPRISE    198 (POOR)
HERMISTON      63 (POOR)
JOHN DAY      558 (FAIR)
LA GRANDE     361 (FAIR)
MADRAS        375 (FAIR)
MEACHAM       365 (FAIR)
PENDLETON      28 (POOR)
REDMOND       353 (FAIR)
SENECA        402 (FAIR)
THE DALLES     45 (POOR)

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.
$$