Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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336
AUUS46 KPDT 181029
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
329 AM PDT FRI AUG 18 2017

*** 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.      SW-W 8-14 MPH.
TRANSPORT WINDS               SE-SW 3-7 MPH.      W 12-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  74 (POOR).          583 (FAIR).
OUTLOOK FOR SAT AUG 19        402 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 VRBL 0-5 MPH.       W 5-10 MPH.
TRANSPORT WINDS               VRBL 0-5 MPH.       W 12-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  28 (POOR).          261 (POOR).
OUTLOOK FOR SAT AUG 19        337 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 2-6 MPH.         NW 3-7 MPH.
TRANSPORT WINDS               SW 2-6 MPH.         W 15-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT AUG 19        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          476 (FAIR).
OUTLOOK FOR SAT AUG 19        381 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      216 (POOR)
ELLENSBURG    393 (FAIR)
GOLDENDALE    225 (POOR)
TRI-CITIES    366 (FAIR)
WALLA WALLA   650 (GOOD)
YAKIMA        332 (FAIR)
BEND          369 (FAIR)
PRINEVILLE    409 (FAIR)
ENTERPRISE    553 (FAIR)
HERMISTON     588 (FAIR)
JOHN DAY      502 (FAIR)
LA GRANDE     520 (FAIR)
MADRAS        385 (FAIR)
MEACHAM       494 (FAIR)
PENDLETON     632 (GOOD)
REDMOND       435 (FAIR)
SENECA        517 (FAIR)
THE DALLES    426 (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/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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