Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 251100
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
400 AM PDT SAT APR 25 2015

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S-SW 5-10 MPH.      SW-W 9-14 MPH.
TRANSPORT WINDS               S-SW 5-10 MPH.      SW 15-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       11500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 26        FAIR.

VENTILATION INDEX (CATEGORY)  99 (POOR).          653 (GOOD).
OUTLOOK FOR SUN APR 26        371 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-6 MPH.         W 5-10 MPH.
TRANSPORT WINDS               NW 2-6 MPH.         SW 12-18 MPH.
MIXING HEIGHT                 NEAR SURFACE.       13000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 26        FAIR.

VENTILATION INDEX (CATEGORY)  57 (POOR).          639 (GOOD).
OUTLOOK FOR SUN APR 26        334 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 5-10 MPH.        NW 10-15 MPH.
TRANSPORT WINDS               SW 10-15 MPH.       SW 15-20 MPH.
MIXING HEIGHT                 4000 FT MSL.        8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 26        GOOD.

VENTILATION INDEX (CATEGORY)  41 (POOR).          603 (GOOD).
OUTLOOK FOR SUN APR 26        332 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      911 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE    920 (GOOD)
TRI-CITIES    609 (GOOD)
WALLA WALLA   628 (GOOD)
YAKIMA        665 (GOOD)
BEND          878 (GOOD)
PRINEVILLE    926 (GOOD)
ENTERPRISE    492 (FAIR)
HERMISTON     676 (GOOD)
JOHN DAY      894 (GOOD)
LA GRANDE     667 (GOOD)
MADRAS        842 (GOOD)
MEACHAM       570 (FAIR)
PENDLETON     628 (GOOD)
REDMOND       989 (GOOD)
SENECA        972 (GOOD)
THE DALLES    953 (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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