108
AUUS46 KPDT 181223
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
523 AM PDT WED SEP 18 2024

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 6-12 MPH.        SW 5-10 MPH.
TRANSPORT WINDS               SW 8-16 MPH.        SW 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR THU SEP 19        FAIR.
OUTLOOK FOR FRI SEP 20        FAIR.

VENTILATION INDEX (CATEGORY)  103 (POOR).         405 (FAIR).
OUTLOOK FOR THU SEP 19        405 (FAIR).
OUTLOOK FOR FRI SEP 20        394 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-8 MPH.         NW 4-8 MPH.
TRANSPORT WINDS               NW 5-8 MPH.         NW 5-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       7000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR THU SEP 19        POOR.
OUTLOOK FOR FRI SEP 20        FAIR.

VENTILATION INDEX (CATEGORY)  51 (POOR).          224 (POOR).
OUTLOOK FOR THU SEP 19        143 (POOR).
OUTLOOK FOR FRI SEP 20        239 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 2-4 MPH.          NW 3-6 MPH.
TRANSPORT WINDS               W 3-6 MPH.          NW 3-6 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR THU SEP 19        GOOD.
OUTLOOK FOR FRI SEP 20        FAIR.

VENTILATION INDEX (CATEGORY)  61 (POOR).          249 (POOR).
OUTLOOK FOR THU SEP 19        345 (FAIR).
OUTLOOK FOR FRI SEP 20        363 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 6-12 MPH.        W 5-10 MPH.
TRANSPORT WINDS               SW 8-16 MPH.        W 6-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR THU SEP 19        FAIR.
OUTLOOK FOR FRI SEP 20        FAIR.

VENTILATION INDEX (CATEGORY)  126 (POOR).         365 (FAIR).
OUTLOOK FOR THU SEP 19        392 (FAIR).
OUTLOOK FOR FRI SEP 20        428 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      412 (FAIR)
ELLENSBURG    489 (FAIR)
GOLDENDALE    383 (FAIR)
TRI-CITIES    349 (FAIR)
WALLA WALLA   422 (FAIR)
YAKIMA        225 (POOR)
BEND          140 (POOR)
PRINEVILLE    166 (POOR)
ENTERPRISE    305 (FAIR)
HERMISTON     412 (FAIR)
JOHN DAY      177 (POOR)
LA GRANDE     293 (POOR)
MADRAS        128 (POOR)
MEACHAM       199 (POOR)
PENDLETON     421 (FAIR)
REDMOND       142 (POOR)
SENECA        246 (POOR)
THE DALLES    462 (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.
$$