463
AUUS46 KPDT 301124
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
424 AM PDT TUE APR 30 2024

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 10-18 MPH.       W 13-18 MPH.
TRANSPORT WINDS               SW 11-20 MPH.       W 14-20 MPH.
MIXING HEIGHT                 2000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR WED MAY 1         GOOD.
OUTLOOK FOR THU MAY 2         FAIR.

VENTILATION INDEX (CATEGORY)  332 (FAIR).         940 (GOOD).
OUTLOOK FOR WED MAY 1         810 (GOOD).
OUTLOOK FOR THU MAY 2         270 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 4-10 MPH.        SW 10-13 MPH.
TRANSPORT WINDS               SW 4-10 MPH.        W 13-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED MAY 1         FAIR.
OUTLOOK FOR THU MAY 2         FAIR.

VENTILATION INDEX (CATEGORY)  139 (POOR).         580 (FAIR).
OUTLOOK FOR WED MAY 1         564 (FAIR).
OUTLOOK FOR THU MAY 2         422 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 5-9 MPH.         W 9-12 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         W 13-15 MPH.
MIXING HEIGHT                 4000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED MAY 1         GOOD.
OUTLOOK FOR THU MAY 2         FAIR.

VENTILATION INDEX (CATEGORY)  229 (POOR).         621 (GOOD).
OUTLOOK FOR WED MAY 1         575 (FAIR).
OUTLOOK FOR THU MAY 2         344 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 10-17 MPH.       W 11-15 MPH.
TRANSPORT WINDS               SW 11-19 MPH.       W 13-17 MPH.
MIXING HEIGHT                 2000 FT MSL.        6500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR WED MAY 1         GOOD.
OUTLOOK FOR THU MAY 2         FAIR.

VENTILATION INDEX (CATEGORY)  366 (FAIR).         797 (GOOD).
OUTLOOK FOR WED MAY 1         773 (GOOD).
OUTLOOK FOR THU MAY 2         267 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      406 (FAIR)
ELLENSBURG    374 (FAIR)
GOLDENDALE    513 (FAIR)
TRI-CITIES    875 (GOOD)
WALLA WALLA   760 (GOOD)
YAKIMA        429 (FAIR)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE    779 (GOOD)
HERMISTON    1012 (GOOD)
JOHN DAY      869 (GOOD)
LA GRANDE     688 (GOOD)
MADRAS       1050 (GOOD)
MEACHAM       641 (GOOD)
PENDLETON     948 (GOOD)
REDMOND      1050 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    439 (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:
HTTP://WWW.WRH.NOAA.GOV/PDT/GFORECAST/GINDEX.PHP?FCST=MIXHGT,VENTCAT,TRANSWIND,VENTINDX&VT=0,72

IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
$$