Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 201212
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
512 AM PDT TUE APR 20 2021

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-6 MPH.         NE 8-12 MPH.
TRANSPORT WINDS               S 3-6 MPH.          NE 11-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 21        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          758 (GOOD).
OUTLOOK FOR WED APR 21        390 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-6 MPH.         NE 8-13 MPH.
TRANSPORT WINDS               NW 4-6 MPH.         NE 10-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 21        POOR.

VENTILATION INDEX (CATEGORY)  33 (POOR).          905 (GOOD).
OUTLOOK FOR WED APR 21        407 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 1-4 MPH.          N 6-10 MPH.
TRANSPORT WINDS               SE 1-4 MPH.         NE 8-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 21        GOOD.

VENTILATION INDEX (CATEGORY)  28 (POOR).          518 (FAIR).
OUTLOOK FOR WED APR 21        517 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      373 (FAIR)
ELLENSBURG    518 (FAIR)
GOLDENDALE   1050 (GOOD)
TRI-CITIES    901 (GOOD)
WALLA WALLA   615 (GOOD)
YAKIMA        769 (GOOD)
BEND          764 (GOOD)
PRINEVILLE    817 (GOOD)
ENTERPRISE    523 (FAIR)
HERMISTON     814 (GOOD)
JOHN DAY      703 (GOOD)
LA GRANDE     531 (FAIR)
MADRAS       1014 (GOOD)
MEACHAM       541 (FAIR)
PENDLETON     649 (GOOD)
REDMOND       928 (GOOD)
SENECA        637 (GOOD)
THE DALLES    812 (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:
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.
$$


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