Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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674
AUUS46 KPDT 251113
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
413 AM PDT MON SEP 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                 SE 3-7 MPH.         SW-W 4-9 MPH.
TRANSPORT WINDS               SE 3-7 MPH.         W 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE SEP 26        POOR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          464 (FAIR).
OUTLOOK FOR TUE SEP 26        127 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 0-4 MPH.          SW 2-6 MPH.
TRANSPORT WINDS               SW 0-4 MPH.         NW 3-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR TUE SEP 26        POOR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          243 (POOR).
OUTLOOK FOR TUE SEP 26        116 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 0-4 MPH.         W 3-7 MPH.
TRANSPORT WINDS               SE 0-4 MPH.         NW 8-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR TUE SEP 26        GOOD.

VENTILATION INDEX (CATEGORY)  25 (POOR).          179 (POOR).
OUTLOOK FOR TUE SEP 26        255 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      351 (FAIR)
ELLENSBURG    577 (FAIR)
GOLDENDALE    183 (POOR)
TRI-CITIES    351 (FAIR)
WALLA WALLA   434 (FAIR)
YAKIMA        268 (POOR)
BEND          359 (FAIR)
PRINEVILLE    386 (FAIR)
ENTERPRISE    199 (POOR)
HERMISTON     499 (FAIR)
JOHN DAY      292 (POOR)
LA GRANDE      81 (POOR)
MADRAS        354 (FAIR)
MEACHAM       245 (POOR)
PENDLETON     392 (FAIR)
REDMOND       397 (FAIR)
SENECA        370 (FAIR)
THE DALLES    306 (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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