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Daily Dispersion Outlook
Issued by NWS Pendleton, OR

000
AUUS46 KPDT 171100
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
400 AM PDT WED APR 17 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 5-10 MPH.        NW 6-8 MPH.
TRANSPORT WINDS               SW 6-11 MPH.        N 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU APR 18        FAIR.
OUTLOOK FOR FRI APR 19        GOOD.

VENTILATION INDEX (CATEGORY)  114 (POOR).         522 (FAIR).
OUTLOOK FOR THU APR 18        539 (FAIR).
OUTLOOK FOR FRI APR 19        551 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-8 MPH.          E 5-7 MPH.
TRANSPORT WINDS               NW 6-11 MPH.        NE 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU APR 18        FAIR.
OUTLOOK FOR FRI APR 19        GOOD.

VENTILATION INDEX (CATEGORY)  121 (POOR).         709 (GOOD).
OUTLOOK FOR THU APR 18        659 (GOOD).
OUTLOOK FOR FRI APR 19        887 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-8 MPH.          NW 11-16 MPH.
TRANSPORT WINDS               W 5-9 MPH.          N 10-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU APR 18        GOOD.
OUTLOOK FOR FRI APR 19        GOOD.

VENTILATION INDEX (CATEGORY)  176 (POOR).         771 (GOOD).
OUTLOOK FOR THU APR 18        276 (POOR).
OUTLOOK FOR FRI APR 19        395 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 4-9 MPH.         NW 6-8 MPH.
TRANSPORT WINDS               SW 6-10 MPH.        N 6-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU APR 18        FAIR.
OUTLOOK FOR FRI APR 19        FAIR.

VENTILATION INDEX (CATEGORY)  133 (POOR).         468 (FAIR).
OUTLOOK FOR THU APR 18        426 (FAIR).
OUTLOOK FOR FRI APR 19        467 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      511 (FAIR)
ELLENSBURG    700 (GOOD)
GOLDENDALE    540 (FAIR)
TRI-CITIES    565 (FAIR)
WALLA WALLA   366 (FAIR)
YAKIMA        773 (GOOD)
BEND          357 (FAIR)
PRINEVILLE    486 (FAIR)
ENTERPRISE    616 (GOOD)
HERMISTON     539 (FAIR)
JOHN DAY      777 (GOOD)
LA GRANDE     782 (GOOD)
MADRAS        565 (FAIR)
MEACHAM       584 (FAIR)
PENDLETON     523 (FAIR)
REDMOND       490 (FAIR)
SENECA        758 (GOOD)
THE DALLES    411 (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.
$$