664
AUUS46 KPDT 221246
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
446 AM PST SAT FEB 22 2025

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

FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 7-16 MPH.        S 10-19 MPH.
TRANSPORT WINDS               S 7-16 MPH.         S 10-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SUN FEB 23        GOOD.
OUTLOOK FOR MON FEB 24        FAIR.

VENTILATION INDEX (CATEGORY)  32 (POOR).          88 (POOR).
OUTLOOK FOR SUN FEB 23        275 (POOR).
OUTLOOK FOR MON FEB 24        94 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-8 MPH.          S 8-11 MPH.
TRANSPORT WINDS               SE 3-8 MPH.         S 6-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SUN FEB 23        GOOD.
OUTLOOK FOR MON FEB 24        POOR.

VENTILATION INDEX (CATEGORY)  26 (POOR).          52 (POOR).
OUTLOOK FOR SUN FEB 23        267 (POOR).
OUTLOOK FOR MON FEB 24        40 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 15-24 MPH.        S 21-31 MPH.
TRANSPORT WINDS               S 12-24 MPH.        S 19-26 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SUN FEB 23        FAIR.
OUTLOOK FOR MON FEB 24        FAIR.

VENTILATION INDEX (CATEGORY)  121 (POOR).         182 (POOR).
OUTLOOK FOR SUN FEB 23        140 (POOR).
OUTLOOK FOR MON FEB 24        189 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 13-21 MPH.        S 14-23 MPH.
TRANSPORT WINDS               S 13-21 MPH.        S 16-24 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           FAIR.               GOOD.
OUTLOOK FOR SUN FEB 23        GOOD.
OUTLOOK FOR MON FEB 24        GOOD.

VENTILATION INDEX (CATEGORY)  58 (POOR).          112 (POOR).
OUTLOOK FOR SUN FEB 23        240 (POOR).
OUTLOOK FOR MON FEB 24        165 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM       88 (POOR)
ELLENSBURG     44 (POOR)
GOLDENDALE     56 (POOR)
TRI-CITIES     67 (POOR)
WALLA WALLA    88 (POOR)
YAKIMA         39 (POOR)
BEND          188 (POOR)
PRINEVILLE    358 (FAIR)
ENTERPRISE     55 (POOR)
HERMISTON      34 (POOR)
JOHN DAY      157 (POOR)
LA GRANDE     157 (POOR)
MADRAS        466 (FAIR)
MEACHAM        62 (POOR)
PENDLETON     140 (POOR)
REDMOND       395 (FAIR)
SENECA        144 (POOR)
THE DALLES     31 (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.
$$