Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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530
AUUS46 KPDT 251130
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
430 AM PDT THU MAY 25 2017

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S-SW 5-9 MPH.       N-NE 4-7 MPH.
TRANSPORT WINDS               S-SW 5-9 MPH.       NE 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI MAY 26        FAIR.

VENTILATION INDEX (CATEGORY)  107 (POOR).         102 (POOR).
OUTLOOK FOR FRI MAY 26        416 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 5-8 MPH.          E-NE 4-6 MPH.
TRANSPORT WINDS               W 5-8 MPH.          E-NE 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR FRI MAY 26        POOR.

VENTILATION INDEX (CATEGORY)  74 (POOR).          314 (FAIR).
OUTLOOK FOR FRI MAY 26        558 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N-NW 4-11 MPH.      N-NW 7-13 MPH.
TRANSPORT WINDS               N-NW 6-9 MPH.       NW 9-13 MPH.
MIXING HEIGHT                 4000 FT MSL.        8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR FRI MAY 26        GOOD.

VENTILATION INDEX (CATEGORY)  96 (POOR).          344 (FAIR).
OUTLOOK FOR FRI MAY 26        725 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      515 (FAIR)
ELLENSBURG    645 (GOOD)
GOLDENDALE    299 (POOR)
TRI-CITIES    126 (POOR)
WALLA WALLA    83 (POOR)
YAKIMA        505 (FAIR)
BEND          380 (FAIR)
PRINEVILLE    546 (FAIR)
ENTERPRISE    409 (FAIR)
HERMISTON      86 (POOR)
JOHN DAY      168 (POOR)
LA GRANDE     401 (FAIR)
MADRAS        468 (FAIR)
MEACHAM       292 (POOR)
PENDLETON     119 (POOR)
REDMOND       475 (FAIR)
SENECA        265 (POOR)
THE DALLES    274 (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/FORECAST/FWXGRAPHICALVENTILATION.PHP?WFO=PDT

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



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