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Daily Dispersion Outlook
Issued by NWS Pendleton, OR

000
AUUS46 KPDT 211122
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
422 AM PDT SAT APR 21 2018

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 10-20 MPH.       W 16-23 MPH.
TRANSPORT WINDS               SW 10-22 MPH.       W 18-21 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SUN APR 22        POOR.

VENTILATION INDEX (CATEGORY)  302 (FAIR).         999 (GOOD).
OUTLOOK FOR SUN APR 22        240 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 2-12 MPH.        W 10-20 MPH.
TRANSPORT WINDS               SW 8-22 MPH.        NW 12-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SUN APR 22        POOR.

VENTILATION INDEX (CATEGORY)  195 (POOR).         871 (GOOD).
OUTLOOK FOR SUN APR 22        253 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 0-6 MPH.         W 10-16 MPH.
TRANSPORT WINDS               NW 0-4 MPH.         W 12-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SUN APR 22        GOOD.

VENTILATION INDEX (CATEGORY)  61 (POOR).          618 (GOOD).
OUTLOOK FOR SUN APR 22        343 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM     1050 (GOOD)
ELLENSBURG   1050 (GOOD)
GOLDENDALE    834 (GOOD)
TRI-CITIES    758 (GOOD)
WALLA WALLA  1050 (GOOD)
YAKIMA        752 (GOOD)
BEND          246 (POOR)
PRINEVILLE    348 (FAIR)
ENTERPRISE    613 (GOOD)
HERMISTON     774 (GOOD)
JOHN DAY      428 (FAIR)
LA GRANDE     654 (GOOD)
MADRAS        386 (FAIR)
MEACHAM       773 (GOOD)
PENDLETON    1050 (GOOD)
REDMOND       357 (FAIR)
SENECA        387 (FAIR)
THE DALLES    558 (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/GFORECAST/GINDEX.PHP?FCST=MIXHGT,VENTCAT,TRANSWIND,VENTINDX&VT=0,72

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