Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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996
AUUS46 KPDT 250927
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
227 AM PDT FRI MAY 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                 SE-SW 3-7 MPH.      W-NW 6-12 MPH.
TRANSPORT WINDS               SE-SW 3-7 MPH.      SE 6-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT MAY 26        FAIR.

VENTILATION INDEX (CATEGORY)  97 (POOR).          475 (FAIR).
OUTLOOK FOR SAT MAY 26        365 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 1-5 MPH.         NW 5-10 MPH.
TRANSPORT WINDS               NW 1-5 MPH.         SW 10-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT MAY 26        FAIR.

VENTILATION INDEX (CATEGORY)  78 (POOR).          362 (FAIR).
OUTLOOK FOR SAT MAY 26        370 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 VRBL 0-4 MPH.       N 5-10 MPH.
TRANSPORT WINDS               VRBL 0-4 MPH.       SE 15-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT MAY 26        FAIR.

VENTILATION INDEX (CATEGORY)  35 (POOR).          459 (FAIR).
OUTLOOK FOR SAT MAY 26        247 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      314 (FAIR)
ELLENSBURG    444 (FAIR)
GOLDENDALE    313 (FAIR)
TRI-CITIES    530 (FAIR)
WALLA WALLA   371 (FAIR)
YAKIMA        278 (POOR)
BEND          309 (FAIR)
PRINEVILLE    287 (POOR)
ENTERPRISE    354 (FAIR)
HERMISTON     512 (FAIR)
JOHN DAY      450 (FAIR)
LA GRANDE     509 (FAIR)
MADRAS        301 (FAIR)
MEACHAM       304 (FAIR)
PENDLETON     360 (FAIR)
REDMOND       286 (POOR)
SENECA        389 (FAIR)
THE DALLES    477 (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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