Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 201347
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
547 AM PST TUE FEB 20 2018

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 E-SE 4-8 MPH.       SW 2-5 MPH.
TRANSPORT WINDS               E-SE 4-8 MPH.       SW 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED FEB 21        POOR.

VENTILATION INDEX (CATEGORY)  36 (POOR).          332 (FAIR).
OUTLOOK FOR WED FEB 21        96 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N-NW 1-4 MPH.       SE 2-6 MPH.
TRANSPORT WINDS               N-NW 1-4 MPH.       SE 3-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED FEB 21        POOR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          138 (POOR).
OUTLOOK FOR WED FEB 21        96 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S-SE 4-8 MPH.       S 4-9 MPH.
TRANSPORT WINDS               S-SE 4-8 MPH.       SW 5-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED FEB 21        POOR.

VENTILATION INDEX (CATEGORY)  32 (POOR).          251 (POOR).
OUTLOOK FOR WED FEB 21        147 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      180 (POOR)
ELLENSBURG    196 (POOR)
GOLDENDALE    150 (POOR)
TRI-CITIES    255 (POOR)
WALLA WALLA   383 (FAIR)
YAKIMA        144 (POOR)
BEND          234 (POOR)
PRINEVILLE    236 (POOR)
ENTERPRISE    207 (POOR)
HERMISTON     318 (FAIR)
JOHN DAY      283 (POOR)
LA GRANDE     253 (POOR)
MADRAS        292 (POOR)
MEACHAM       287 (POOR)
PENDLETON     369 (FAIR)
REDMOND       210 (POOR)
SENECA        337 (FAIR)
THE DALLES    196 (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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