Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 181135
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
435 AM PDT SAT APR 18 2015

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 4-9 MPH.         NW 5-8 MPH.
TRANSPORT WINDS               W 2-9 MPH.          N 7-10 MPH.
MIXING HEIGHT                 2000 FT MSL.        7000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN APR 19        POOR.

VENTILATION INDEX (CATEGORY)  37 (POOR).          265 (POOR).
OUTLOOK FOR SUN APR 19        189 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 7-10 MPH.        N 1-9 MPH.
TRANSPORT WINDS               NW-N 6-15 MPH.      N 2-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN APR 19        POOR.

VENTILATION INDEX (CATEGORY)  55 (POOR).          323 (FAIR).
OUTLOOK FOR SUN APR 19        235 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 2-5 MPH.          NW 9-12 MPH.
TRANSPORT WINDS               W 2-5 MPH.          N 9-12 MPH.
MIXING HEIGHT                 4500 FT MSL.        8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN APR 19        GOOD.

VENTILATION INDEX (CATEGORY)  28 (POOR).          360 (FAIR).
OUTLOOK FOR SUN APR 19        352 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       86 (POOR)
ELLENSBURG     92 (POOR)
GOLDENDALE    268 (POOR)
TRI-CITIES    406 (FAIR)
WALLA WALLA   147 (POOR)
YAKIMA        233 (POOR)
BEND          269 (POOR)
PRINEVILLE    343 (FAIR)
ENTERPRISE    468 (FAIR)
HERMISTON     314 (FAIR)
JOHN DAY      423 (FAIR)
LA GRANDE     391 (FAIR)
MADRAS        351 (FAIR)
MEACHAM       274 (POOR)
PENDLETON     215 (POOR)
REDMOND       352 (FAIR)
SENECA        420 (FAIR)
THE DALLES    286 (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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