Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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821
AUUS46 KPDT 221119
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
419 AM PDT SAT APR 22 2017

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 2-9 MPH.          W 9-16 MPH.
TRANSPORT WINDS               E 5-13 MPH.         SW 16-23 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 23        GOOD.

VENTILATION INDEX (CATEGORY)  76 (POOR).          709 (GOOD).
OUTLOOK FOR SUN APR 23        1048 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-5 MPH.         SW 6-9 MPH.
TRANSPORT WINDS               N 6-8 MPH.          W 13-21 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN APR 23        GOOD.

VENTILATION INDEX (CATEGORY)  46 (POOR).          343 (FAIR).
OUTLOOK FOR SUN APR 23        896 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 0-5 MPH.         S 10-17 MPH.
TRANSPORT WINDS               SE 6-12 MPH.        S 24-27 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 23        GOOD.

VENTILATION INDEX (CATEGORY)  136 (POOR).         950 (GOOD).
OUTLOOK FOR SUN APR 23        499 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      361 (FAIR)
ELLENSBURG    360 (FAIR)
GOLDENDALE    637 (GOOD)
TRI-CITIES    609 (GOOD)
WALLA WALLA  1050 (GOOD)
YAKIMA        279 (POOR)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE    644 (GOOD)
HERMISTON     444 (FAIR)
JOHN DAY     1050 (GOOD)
LA GRANDE    1050 (GOOD)
MADRAS       1050 (GOOD)
MEACHAM      1050 (GOOD)
PENDLETON     595 (FAIR)
REDMOND      1050 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    309 (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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