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Daily Dispersion Outlook
Issued by NWS Pendleton, OR

000
AUUS46 KPDT 221135
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
435 AM PDT MON APR 22 2024

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-5 MPH.         N 5-10 MPH.
TRANSPORT WINDS               SW 3-6 MPH.         N 7-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE APR 23        FAIR.
OUTLOOK FOR WED APR 24        GOOD.

VENTILATION INDEX (CATEGORY)  35 (POOR).          355 (FAIR).
OUTLOOK FOR TUE APR 23        161 (POOR).
OUTLOOK FOR WED APR 24        617 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-5 MPH.         E 4-8 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         NE 6-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE APR 23        POOR.
OUTLOOK FOR WED APR 24        GOOD.

VENTILATION INDEX (CATEGORY)  42 (POOR).          280 (POOR).
OUTLOOK FOR TUE APR 23        124 (POOR).
OUTLOOK FOR WED APR 24        500 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-4 MPH.         N 5-10 MPH.
TRANSPORT WINDS               N 3-6 MPH.          NW 6-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE APR 23        FAIR.
OUTLOOK FOR WED APR 24        FAIR.

VENTILATION INDEX (CATEGORY)  42 (POOR).          316 (FAIR).
OUTLOOK FOR TUE APR 23        189 (POOR).
OUTLOOK FOR WED APR 24        443 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 2-4 MPH.         N 5-10 MPH.
TRANSPORT WINDS               S 3-7 MPH.          N 6-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR TUE APR 23        POOR.
OUTLOOK FOR WED APR 24        FAIR.

VENTILATION INDEX (CATEGORY)  31 (POOR).          292 (POOR).
OUTLOOK FOR TUE APR 23        127 (POOR).
OUTLOOK FOR WED APR 24        555 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      262 (POOR)
ELLENSBURG    256 (POOR)
GOLDENDALE    385 (FAIR)
TRI-CITIES    365 (FAIR)
WALLA WALLA   236 (POOR)
YAKIMA        277 (POOR)
BEND          175 (POOR)
PRINEVILLE    199 (POOR)
ENTERPRISE    363 (FAIR)
HERMISTON     382 (FAIR)
JOHN DAY      348 (FAIR)
LA GRANDE     349 (FAIR)
MADRAS        222 (POOR)
MEACHAM       280 (POOR)
PENDLETON     355 (FAIR)
REDMOND       187 (POOR)
SENECA        447 (FAIR)
THE DALLES    280 (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.
$$