Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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377
AUUS46 KPDT 201051
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
351 AM PDT SUN MAY 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                 SW 3-6 MPH.         W 7-9 MPH.
TRANSPORT WINDS               SW 5-9 MPH.         SW 6-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON MAY 21        POOR.

VENTILATION INDEX (CATEGORY)  68 (POOR).          160 (POOR).
OUTLOOK FOR MON MAY 21        135 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 4-5 MPH.         S 4-6 MPH.
TRANSPORT WINDS               NW 6-8 MPH.         W 6-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR MON MAY 21        POOR.

VENTILATION INDEX (CATEGORY)  77 (POOR).          88 (POOR).
OUTLOOK FOR MON MAY 21        106 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 4-6 MPH.         NW 6-9 MPH.
TRANSPORT WINDS               S 5-7 MPH.          NW 7-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR MON MAY 21        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          109 (POOR).
OUTLOOK FOR MON MAY 21        184 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      255 (POOR)
ELLENSBURG    200 (POOR)
GOLDENDALE    212 (POOR)
TRI-CITIES    134 (POOR)
WALLA WALLA   134 (POOR)
YAKIMA         70 (POOR)
BEND          272 (POOR)
PRINEVILLE    222 (POOR)
ENTERPRISE    490 (FAIR)
HERMISTON     189 (POOR)
JOHN DAY      102 (POOR)
LA GRANDE     121 (POOR)
MADRAS        233 (POOR)
MEACHAM        72 (POOR)
PENDLETON     132 (POOR)
REDMOND       248 (POOR)
SENECA         39 (POOR)
THE DALLES    490 (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 MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
$$



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