906
AUUS46 KPDT 171113
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
413 AM PDT SAT MAY 17 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-8 MPH.          W 10-14 MPH.
TRANSPORT WINDS               S 4-8 MPH.          W 6-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN MAY 18        GOOD.
OUTLOOK FOR MON MAY 19        GOOD.

VENTILATION INDEX (CATEGORY)  57 (POOR).          278 (POOR).
OUTLOOK FOR SUN MAY 18        1050 (GOOD).
OUTLOOK FOR MON MAY 19        813 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 3-6 MPH.         W 9-13 MPH.
TRANSPORT WINDS               NW 3-6 MPH.         W 6-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN MAY 18        GOOD.
OUTLOOK FOR MON MAY 19        FAIR.

VENTILATION INDEX (CATEGORY)  57 (POOR).          204 (POOR).
OUTLOOK FOR SUN MAY 18        1050 (GOOD).
OUTLOOK FOR MON MAY 19        389 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 2-5 MPH.          NW 10-13 MPH.
TRANSPORT WINDS               N 2-5 MPH.          NW 11-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN MAY 18        GOOD.
OUTLOOK FOR MON MAY 19        GOOD.

VENTILATION INDEX (CATEGORY)  29 (POOR).          215 (POOR).
OUTLOOK FOR SUN MAY 18        1038 (GOOD).
OUTLOOK FOR MON MAY 19        466 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 4-8 MPH.          W 9-13 MPH.
TRANSPORT WINDS               S 4-8 MPH.          W 10-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SUN MAY 18        GOOD.
OUTLOOK FOR MON MAY 19        GOOD.

VENTILATION INDEX (CATEGORY)  49 (POOR).          232 (POOR).
OUTLOOK FOR SUN MAY 18        1047 (GOOD).
OUTLOOK FOR MON MAY 19        705 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      429 (FAIR)
ELLENSBURG    243 (POOR)
GOLDENDALE    785 (GOOD)
TRI-CITIES    221 (POOR)
WALLA WALLA   223 (POOR)
YAKIMA        206 (POOR)
BEND          709 (GOOD)
PRINEVILLE    682 (GOOD)
ENTERPRISE    230 (POOR)
HERMISTON     323 (FAIR)
JOHN DAY      292 (POOR)
LA GRANDE     225 (POOR)
MADRAS        715 (GOOD)
MEACHAM       172 (POOR)
PENDLETON     296 (POOR)
REDMOND       894 (GOOD)
SENECA        341 (FAIR)
THE DALLES    972 (GOOD)

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:
HTTPS://WWW.WEATHER.GOV/PDT/DSSBRIEFING

IF YOU WOULD LIKE TO KNOW MORE ABOUT THIS PRODUCT...CONTACT THE
NATIONAL WEATHER SERVICE IN PENDLETON.
$$