Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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614
AUUS46 KPDT 291152
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
452 AM PDT SAT APR 29 2017

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-9 MPH.         SW-W 6-12 MPH.
TRANSPORT WINDS               SE 4-9 MPH.         SW 15-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 30        GOOD.

VENTILATION INDEX (CATEGORY)  77 (POOR).          540 (FAIR).
OUTLOOK FOR SUN APR 30        1048 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 2-6 MPH.         S 3-7 MPH.
TRANSPORT WINDS               SW 2-6 MPH.         W 15-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 30        GOOD.

VENTILATION INDEX (CATEGORY)  50 (POOR).          444 (FAIR).
OUTLOOK FOR SUN APR 30        1044 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-4 MPH.         SE 3-7 MPH.
TRANSPORT WINDS               NW 0-4 MPH.         W 15-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 30        GOOD.

VENTILATION INDEX (CATEGORY)  46 (POOR).          457 (FAIR).
OUTLOOK FOR SUN APR 30        966 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      307 (FAIR)
ELLENSBURG    397 (FAIR)
GOLDENDALE    333 (FAIR)
TRI-CITIES    548 (FAIR)
WALLA WALLA   507 (FAIR)
YAKIMA        364 (FAIR)
BEND          411 (FAIR)
PRINEVILLE    461 (FAIR)
ENTERPRISE    402 (FAIR)
HERMISTON     549 (FAIR)
JOHN DAY      463 (FAIR)
LA GRANDE     466 (FAIR)
MADRAS        465 (FAIR)
MEACHAM       517 (FAIR)
PENDLETON     476 (FAIR)
REDMOND       443 (FAIR)
SENECA        484 (FAIR)
THE DALLES    164 (POOR)

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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