Daily Dispersion Outlook
Issued by NWS Pendleton, OR

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000
AUUS46 KPDT 221137
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
437 AM PDT TUE MAY 22 2018

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-6 MPH.          NE 6-8 MPH.
TRANSPORT WINDS               S 4-6 MPH.          NE 7-9 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR WED MAY 23        POOR.

VENTILATION INDEX (CATEGORY)  30 (POOR).          546 (FAIR).
OUTLOOK FOR WED MAY 23        520 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 4-7 MPH.         NE 2-6 MPH.
TRANSPORT WINDS               NW 4-7 MPH.         NE 3-7 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR WED MAY 23        FAIR.

VENTILATION INDEX (CATEGORY)  40 (POOR).          250 (POOR).
OUTLOOK FOR WED MAY 23        276 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NE 2-3 MPH.         NE 8-9 MPH.
TRANSPORT WINDS               NE 2-3 MPH.         NE 8-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       10500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR WED MAY 23        FAIR.

VENTILATION INDEX (CATEGORY)  39 (POOR).          489 (FAIR).
OUTLOOK FOR WED MAY 23        353 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      308 (FAIR)
ELLENSBURG    300 (POOR)
GOLDENDALE    297 (POOR)
TRI-CITIES    491 (FAIR)
WALLA WALLA   548 (FAIR)
YAKIMA        181 (POOR)
BEND          278 (POOR)
PRINEVILLE    345 (FAIR)
ENTERPRISE    348 (FAIR)
HERMISTON     570 (FAIR)
JOHN DAY      273 (POOR)
LA GRANDE     516 (FAIR)
MADRAS        443 (FAIR)
MEACHAM       431 (FAIR)
PENDLETON     519 (FAIR)
REDMOND       316 (FAIR)
SENECA        220 (POOR)
THE DALLES    240 (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 MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
$$



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