Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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125
AUUS46 KPDT 221152
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
452 AM PDT FRI SEP 22 2017

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 2-5 MPH.          NW 4-8 MPH.
TRANSPORT WINDS               E 2-5 MPH.          N 6-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT SEP 23        POOR.

VENTILATION INDEX (CATEGORY)  44 (POOR).          511 (FAIR).
OUTLOOK FOR SAT SEP 23        209 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-7 MPH.         N 4-9 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         N 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT SEP 23        POOR.

VENTILATION INDEX (CATEGORY)  62 (POOR).          632 (GOOD).
OUTLOOK FOR SAT SEP 23        191 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 5-9 MPH.         NW 9-15 MPH.
TRANSPORT WINDS               NW 5-10 MPH.         N 10-16 MPH.
MIXING HEIGHT                 4000 FT MSL.        7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT SEP 23        GOOD.

VENTILATION INDEX (CATEGORY)  108 (POOR).         458 (FAIR).
OUTLOOK FOR SAT SEP 23        515 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      225 (POOR)
ELLENSBURG    525 (FAIR)
GOLDENDALE    440 (FAIR)
TRI-CITIES    599 (FAIR)
WALLA WALLA   319 (FAIR)
YAKIMA        604 (GOOD)
BEND          591 (FAIR)
PRINEVILLE    645 (GOOD)
ENTERPRISE    381 (FAIR)
HERMISTON     591 (FAIR)
JOHN DAY      752 (GOOD)
LA GRANDE     504 (FAIR)
MADRAS        643 (GOOD)
MEACHAM       394 (FAIR)
PENDLETON     502 (FAIR)
REDMOND       643 (GOOD)
SENECA        717 (GOOD)
THE DALLES    314 (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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