Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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899
AUUS46 KPDT 201230
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
530 AM PDT WED SEP 20 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 6-12 MPH.        W 10-17 MPH.
TRANSPORT WINDS               SW 12-18 MPH.       SW 17-28 MPH.
MIXING HEIGHT                 2000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR THU SEP 21        FAIR.

VENTILATION INDEX (CATEGORY)  287 (POOR).         915 (GOOD).
OUTLOOK FOR THU SEP 21        744 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E 2-5 MPH.          SW 8-12 MPH.
TRANSPORT WINDS               SW 3-9 MPH.         W 12-19 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU SEP 21        FAIR.

VENTILATION INDEX (CATEGORY)  34 (POOR).          617 (GOOD).
OUTLOOK FOR THU SEP 21        418 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 5-5 MPH.          W 13-14 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         W 14-18 MPH.
MIXING HEIGHT                 4000 FT MSL.        9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU SEP 21        GOOD.

VENTILATION INDEX (CATEGORY)  39 (POOR).          680 (GOOD).
OUTLOOK FOR THU SEP 21        593 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      658 (GOOD)
ELLENSBURG    656 (GOOD)
GOLDENDALE    819 (GOOD)
TRI-CITIES    739 (GOOD)
WALLA WALLA   753 (GOOD)
YAKIMA        417 (FAIR)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON    1050 (GOOD)
JOHN DAY      818 (GOOD)
LA GRANDE     671 (GOOD)
MADRAS       1050 (GOOD)
MEACHAM       660 (GOOD)
PENDLETON     996 (GOOD)
REDMOND      1050 (GOOD)
SENECA       1050 (GOOD)
THE DALLES   1050 (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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