708
AUUS46 KPDT 271137
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
437 AM PDT THU MAR 27 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 10-20 MPH.       S 8-14 MPH.
TRANSPORT WINDS               SW 10-20 MPH.       N 8-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR FRI MAR 28        GOOD.
OUTLOOK FOR SAT MAR 29        GOOD.

VENTILATION INDEX (CATEGORY)  71 (POOR).          202 (POOR).
OUTLOOK FOR FRI MAR 28        1022 (GOOD).
OUTLOOK FOR SAT MAR 29        736 (GOOD).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 6-13 MPH.         S 5-10 MPH.
TRANSPORT WINDS               W 7-14 MPH.         SE 7-14 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR FRI MAR 28        GOOD.
OUTLOOK FOR SAT MAR 29        FAIR.

VENTILATION INDEX (CATEGORY)  84 (POOR).          290 (POOR).
OUTLOOK FOR FRI MAR 28        1015 (GOOD).
OUTLOOK FOR SAT MAR 29        408 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 8-14 MPH.         S 15-25 MPH.
TRANSPORT WINDS               S 10-15 MPH.        S 20-30 MPH.
MIXING HEIGHT                 NEAR SURFACE.       9000 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR FRI MAR 28        FAIR.
OUTLOOK FOR SAT MAR 29        GOOD.

VENTILATION INDEX (CATEGORY)  73 (POOR).          1050 (GOOD).
OUTLOOK FOR FRI MAR 28        335 (FAIR).
OUTLOOK FOR SAT MAR 29        576 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 10-20 MPH.       SW 8-15 MPH.
TRANSPORT WINDS               SW 10-20 MPH.       SW 10-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR FRI MAR 28        GOOD.
OUTLOOK FOR SAT MAR 29        GOOD.

VENTILATION INDEX (CATEGORY)  67 (POOR).          499 (FAIR).
OUTLOOK FOR FRI MAR 28        810 (GOOD).
OUTLOOK FOR SAT MAR 29        711 (GOOD).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      394 (FAIR)
ELLENSBURG    360 (FAIR)
GOLDENDALE    203 (POOR)
TRI-CITIES    195 (POOR)
WALLA WALLA   220 (POOR)
YAKIMA        375 (FAIR)
BEND         1050 (GOOD)
PRINEVILLE   1050 (GOOD)
ENTERPRISE   1050 (GOOD)
HERMISTON     167 (POOR)
JOHN DAY     1050 (GOOD)
LA GRANDE    1050 (GOOD)
MADRAS       1039 (GOOD)
MEACHAM      1050 (GOOD)
PENDLETON     554 (FAIR)
REDMOND      1050 (GOOD)
SENECA       1050 (GOOD)
THE DALLES    181 (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:
HTTPS://WWW.WEATHER.GOV/PDT/DSSBRIEFING

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