Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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994
AUUS46 KPDT 251045
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
345 AM PDT TUE APR 25 2017

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 11-16 MPH.       SW 11-15 MPH.
TRANSPORT WINDS               SW 12-21 MPH.       SW 14-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR WED APR 26        GOOD.

VENTILATION INDEX (CATEGORY)  176 (POOR).         790 (GOOD).
OUTLOOK FOR WED APR 26        1041 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 7-9 MPH.          SW 8-13 MPH.
TRANSPORT WINDS               W 7-9 MPH.          SW 9-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 26        GOOD.

VENTILATION INDEX (CATEGORY)  32 (POOR).          425 (FAIR).
OUTLOOK FOR WED APR 26        1050 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 4-7 MPH.         W 5-7 MPH.
TRANSPORT WINDS               W 5-9 MPH.          W 7-9 MPH.
MIXING HEIGHT                 4500 FT MSL.        8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 26        GOOD.

VENTILATION INDEX (CATEGORY)  111 (POOR).         326 (FAIR).
OUTLOOK FOR WED APR 26        476 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      142 (POOR)
ELLENSBURG    249 (POOR)
GOLDENDALE    430 (FAIR)
TRI-CITIES    854 (GOOD)
WALLA WALLA   637 (GOOD)
YAKIMA        245 (POOR)
BEND          363 (FAIR)
PRINEVILLE    377 (FAIR)
ENTERPRISE    297 (POOR)
HERMISTON     886 (GOOD)
JOHN DAY      277 (POOR)
LA GRANDE     367 (FAIR)
MADRAS        403 (FAIR)
MEACHAM       368 (FAIR)
PENDLETON     685 (GOOD)
REDMOND       316 (FAIR)
SENECA        354 (FAIR)
THE DALLES    346 (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/FORECAST/FWXGRAPHICALVENTILATION.PHP?WFO=PDT

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



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