550
AUUS46 KPDT 211210
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
410 AM PST FRI FEB 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                 E 4-9 MPH.          N 4-8 MPH.
TRANSPORT WINDS               SE 4-9 MPH.         NE 4-8 MPH.
MIXING HEIGHT                 NEAR SURFACE.       NEAR SURFACE.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SAT FEB 22        FAIR.
OUTLOOK FOR SUN FEB 23        GOOD.

VENTILATION INDEX (CATEGORY)  25 (POOR).          36 (POOR).
OUTLOOK FOR SAT FEB 22        123 (POOR).
OUTLOOK FOR SUN FEB 23        77 (POOR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 N 2-5 MPH.          E 2-5 MPH.
TRANSPORT WINDS               NE 2-5 MPH.         SE 2-5 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SAT FEB 22        POOR.
OUTLOOK FOR SUN FEB 23        FAIR.

VENTILATION INDEX (CATEGORY)  25 (POOR).          36 (POOR).
OUTLOOK FOR SAT FEB 22        74 (POOR).
OUTLOOK FOR SUN FEB 23        87 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 4-8 MPH.         S 17-24 MPH.
TRANSPORT WINDS               S 4-8 MPH.          S 17-20 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT FEB 22        FAIR.
OUTLOOK FOR SUN FEB 23        FAIR.

VENTILATION INDEX (CATEGORY)  41 (POOR).          162 (POOR).
OUTLOOK FOR SAT FEB 22        209 (POOR).
OUTLOOK FOR SUN FEB 23        126 (POOR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SE 6-12 MPH.        S 5-11 MPH.
TRANSPORT WINDS               SE 6-12 MPH.        S 6-13 MPH.
MIXING HEIGHT                 NEAR SURFACE.       2000 FT MSL.
DISPERSION CATEGORY           POOR.               POOR.
OUTLOOK FOR SAT FEB 22        FAIR.
OUTLOOK FOR SUN FEB 23        GOOD.

VENTILATION INDEX (CATEGORY)  30 (POOR).          55 (POOR).
OUTLOOK FOR SAT FEB 22        157 (POOR).
OUTLOOK FOR SUN FEB 23        94 (POOR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      114 (POOR)
ELLENSBURG     54 (POOR)
GOLDENDALE     55 (POOR)
TRI-CITIES     30 (POOR)
WALLA WALLA    36 (POOR)
YAKIMA         26 (POOR)
BEND          105 (POOR)
PRINEVILLE    207 (POOR)
ENTERPRISE     37 (POOR)
HERMISTON      36 (POOR)
JOHN DAY      138 (POOR)
LA GRANDE     157 (POOR)
MADRAS        214 (POOR)
MEACHAM        68 (POOR)
PENDLETON      29 (POOR)
REDMOND       179 (POOR)
SENECA        137 (POOR)
THE DALLES     75 (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.
$$