Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 240917
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
217 AM PDT TUE APR 24 2018

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 3-7 MPH.         NE-E 5-10 MPH.
TRANSPORT WINDS               SE 3-7 MPH.         SE 20-30 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 25        POOR.

VENTILATION INDEX (CATEGORY)  27 (POOR).          436 (FAIR).
OUTLOOK FOR WED APR 25        69 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 5-10 MPH.         NE 5-10 MPH.
TRANSPORT WINDS               W 5-10 MPH.         SE 15-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 25        POOR.

VENTILATION INDEX (CATEGORY)  34 (POOR).          212 (POOR).
OUTLOOK FOR WED APR 25        68 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-6 MPH.         SE 5-10 MPH.
TRANSPORT WINDS               NW 2-6 MPH.         SE 20-30 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED APR 25        GOOD.

VENTILATION INDEX (CATEGORY)  64 (POOR).          432 (FAIR).
OUTLOOK FOR WED APR 25        414 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      284 (POOR)
ELLENSBURG    301 (FAIR)
GOLDENDALE    508 (FAIR)
TRI-CITIES    135 (POOR)
WALLA WALLA   489 (FAIR)
YAKIMA        276 (POOR)
BEND         1031 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE    501 (FAIR)
HERMISTON     292 (POOR)
JOHN DAY      671 (GOOD)
LA GRANDE     547 (FAIR)
MADRAS       1002 (GOOD)
MEACHAM       717 (GOOD)
PENDLETON     556 (FAIR)
REDMOND      1050 (GOOD)
SENECA        712 (GOOD)
THE DALLES    580 (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/INDEX.PHP?FCST=MIXHGT,VENTCAT,TRANSWIND,VENTINDX&VT=0,72

IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.

$$



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