663
AUUS46 KPDT 211105
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
405 AM PDT FRI MAR 21 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 15-25 MPH.        SW 15-25 MPH.
TRANSPORT WINDS               S 15-20 MPH.        SW 15-25 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SAT MAR 22        GOOD.
OUTLOOK FOR SUN MAR 23        GOOD.

VENTILATION INDEX (CATEGORY)  47 (POOR).          427 (FAIR).
OUTLOOK FOR SAT MAR 22        743 (GOOD).
OUTLOOK FOR SUN MAR 23        143 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 10-15 MPH.        SW 15-25 MPH.
TRANSPORT WINDS               S 10-20 MPH.        SW 20-30 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SAT MAR 22        FAIR.
OUTLOOK FOR SUN MAR 23        GOOD.

VENTILATION INDEX (CATEGORY)  37 (POOR).          512 (FAIR).
OUTLOOK FOR SAT MAR 22        577 (FAIR).
OUTLOOK FOR SUN MAR 23        403 (FAIR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 10-15 MPH.        S 15-25 MPH.
TRANSPORT WINDS               S 5-10 MPH.         S 15-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5500 FT MSL.
DISPERSION CATEGORY           POOR.               GOOD.
OUTLOOK FOR SAT MAR 22        FAIR.
OUTLOOK FOR SUN MAR 23        FAIR.

VENTILATION INDEX (CATEGORY)  49 (POOR).          273 (POOR).
OUTLOOK FOR SAT MAR 22        570 (FAIR).
OUTLOOK FOR SUN MAR 23        176 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 13-26 MPH.        SW 15-25 MPH.
TRANSPORT WINDS               S 15-22 MPH.        SW 13-23 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           GOOD.               GOOD.
OUTLOOK FOR SAT MAR 22        GOOD.
OUTLOOK FOR SUN MAR 23        GOOD.

VENTILATION INDEX (CATEGORY)  65 (POOR).          373 (FAIR).
OUTLOOK FOR SAT MAR 22        761 (GOOD).
OUTLOOK FOR SUN MAR 23        161 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       66 (POOR)
ELLENSBURG    139 (POOR)
GOLDENDALE     75 (POOR)
TRI-CITIES    577 (FAIR)
WALLA WALLA   364 (FAIR)
YAKIMA        327 (FAIR)
BEND          461 (FAIR)
PRINEVILLE    466 (FAIR)
ENTERPRISE    347 (FAIR)
HERMISTON     391 (FAIR)
JOHN DAY      227 (POOR)
LA GRANDE     329 (FAIR)
MADRAS        584 (FAIR)
MEACHAM       251 (POOR)
PENDLETON     268 (POOR)
REDMOND       481 (FAIR)
SENECA        235 (POOR)
THE DALLES     48 (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.
$$