Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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264
AUUS46 KPDT 251106
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
406 AM PDT WED APR 25 2018

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 VRB 0-6 MPH.        N 3-7 MPH.
TRANSPORT WINDS               SE 2-8 MPH.         N 3-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU APR 26        POOR.

VENTILATION INDEX (CATEGORY)  33 (POOR).          143 (POOR).
OUTLOOK FOR THU APR 26        154 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 0-6 MPH.          NE 2-5 MPH.
TRANSPORT WINDS               NW 2-6 MPH.         NE 3-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU APR 26        FAIR.

VENTILATION INDEX (CATEGORY)  29 (POOR).          201 (POOR).
OUTLOOK FOR THU APR 26        300 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 0-7 MPH.          VRB 0-4 MPH.
TRANSPORT WINDS               S 7-11 MPH.         VRB 0-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR THU APR 26        GOOD.

VENTILATION INDEX (CATEGORY)  95 (POOR).          270 (POOR).
OUTLOOK FOR THU APR 26        296 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      186 (POOR)
ELLENSBURG    214 (POOR)
GOLDENDALE    178 (POOR)
TRI-CITIES    131 (POOR)
WALLA WALLA   189 (POOR)
YAKIMA        165 (POOR)
BEND          216 (POOR)
PRINEVILLE    101 (POOR)
ENTERPRISE    338 (FAIR)
HERMISTON     141 (POOR)
JOHN DAY      206 (POOR)
LA GRANDE     243 (POOR)
MADRAS         99 (POOR)
MEACHAM       221 (POOR)
PENDLETON     113 (POOR)
REDMOND       211 (POOR)
SENECA        245 (POOR)
THE DALLES    133 (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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