Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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078
AUUS46 KPDT 261031
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
330 AM PDT TUE SEP 26 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-SW 2-6 MPH.      W-NW 3-7 MPH.
TRANSPORT WINDS               SE-SW 2-6 MPH.      NE 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 27        FAIR.

VENTILATION INDEX (CATEGORY)  32 (POOR).          85 (POOR).
OUTLOOK FOR WED SEP 27        190 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-6 MPH.          E 3-7 MPH.
TRANSPORT WINDS               W 2-6 MPH.          NE 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED SEP 27        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          41 (POOR).
OUTLOOK FOR WED SEP 27        381 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 2-6 MPH.         W 3-7 MPH.
TRANSPORT WINDS               SW 2-6 MPH.         NE 10-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED SEP 27        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          155 (POOR).
OUTLOOK FOR WED SEP 27        172 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       86 (POOR)
ELLENSBURG    141 (POOR)
GOLDENDALE    100 (POOR)
TRI-CITIES    102 (POOR)
WALLA WALLA    91 (POOR)
YAKIMA         37 (POOR)
BEND          132 (POOR)
PRINEVILLE    157 (POOR)
ENTERPRISE    227 (POOR)
HERMISTON      33 (POOR)
JOHN DAY      102 (POOR)
LA GRANDE     122 (POOR)
MADRAS         88 (POOR)
MEACHAM        56 (POOR)
PENDLETON      27 (POOR)
REDMOND       151 (POOR)
SENECA         54 (POOR)
THE DALLES     56 (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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