Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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924
AUUS46 KPDT 211219
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
518 AM PDT THU SEP 21 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 5-11 MPH.        W 6-9 MPH.
TRANSPORT WINDS               SW 12-19 MPH.       W 8-13 MPH.
MIXING HEIGHT                 2000 FT MSL.        8000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR FRI SEP 22        POOR.

VENTILATION INDEX (CATEGORY)  245 (POOR).         552 (FAIR).
OUTLOOK FOR FRI SEP 22        323 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 3-7 MPH.          W 2-6 MPH.
TRANSPORT WINDS               W 3-7 MPH.          NW 6-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI SEP 22        FAIR.

VENTILATION INDEX (CATEGORY)  58 (POOR).          381 (FAIR).
OUTLOOK FOR FRI SEP 22        611 (GOOD).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE-S 2-5 MPH.       NW 8-11 MPH.
TRANSPORT WINDS               SE-S 5-9 MPH.       NW 10-15 MPH.
MIXING HEIGHT                 5500 FT MSL.        9500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR FRI SEP 22        GOOD.

VENTILATION INDEX (CATEGORY)  174 (POOR).         426 (FAIR).
OUTLOOK FOR FRI SEP 22        541 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      359 (FAIR)
ELLENSBURG    381 (FAIR)
GOLDENDALE    316 (FAIR)
TRI-CITIES    490 (FAIR)
WALLA WALLA   571 (FAIR)
YAKIMA        368 (FAIR)
BEND          320 (FAIR)
PRINEVILLE    359 (FAIR)
ENTERPRISE    341 (FAIR)
HERMISTON     486 (FAIR)
JOHN DAY      409 (FAIR)
LA GRANDE     442 (FAIR)
MADRAS        342 (FAIR)
MEACHAM       376 (FAIR)
PENDLETON     550 (FAIR)
REDMOND       383 (FAIR)
SENECA        444 (FAIR)
THE DALLES    614 (GOOD)

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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