Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 261130
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
430 AM PDT THU APR 26 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 2-5 MPH.         N 5-9 MPH.
TRANSPORT WINDS               SE 2-5 MPH.         E 2-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI APR 27        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          123 (POOR).
OUTLOOK FOR FRI APR 27        162 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 5-7 MPH.         NE 4-7 MPH.
TRANSPORT WINDS               NW 5-7 MPH.         NE 4-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI APR 27        POOR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          264 (POOR).
OUTLOOK FOR FRI APR 27        365 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-5 MPH.         S 7-10 MPH.
TRANSPORT WINDS               SE 2-5 MPH.         S 6-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI APR 27        FAIR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          341 (FAIR).
OUTLOOK FOR FRI APR 27        461 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      234 (POOR)
ELLENSBURG    259 (POOR)
GOLDENDALE    321 (FAIR)
TRI-CITIES    142 (POOR)
WALLA WALLA    43 (POOR)
YAKIMA        246 (POOR)
BEND          406 (FAIR)
PRINEVILLE    479 (FAIR)
ENTERPRISE    139 (POOR)
HERMISTON     187 (POOR)
JOHN DAY      387 (FAIR)
LA GRANDE     436 (FAIR)
MADRAS        225 (POOR)
MEACHAM       233 (POOR)
PENDLETON     123 (POOR)
REDMOND       349 (FAIR)
SENECA        417 (FAIR)
THE DALLES    295 (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/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.
$$



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