101
AUUS46 KPDT 041225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI JUL  4 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 5-11 MPH.         SW 10-14 MPH.
TRANSPORT WINDS               SW 6-11 MPH.        SW 12-17 MPH.
MIXING HEIGHT                 NEAR SURFACE.       4000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUL 5         FAIR.
OUTLOOK FOR SUN JUL 6         FAIR.

VENTILATION INDEX (CATEGORY)  123 (POOR).         383 (FAIR).
OUTLOOK FOR SAT JUL 5         554 (FAIR).
OUTLOOK FOR SUN JUL 6         365 (FAIR).

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

                              7:00 AM             AFTERNOON
SURFACE WINDS                 W 4-8 MPH.          SW 8-11 MPH.
TRANSPORT WINDS               NW 5-10 MPH.        SW 8-15 MPH.
MIXING HEIGHT                 NEAR SURFACE.       5000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUL 5         FAIR.
OUTLOOK FOR SUN JUL 6         POOR.

VENTILATION INDEX (CATEGORY)  80 (POOR).          302 (FAIR).
OUTLOOK FOR SAT JUL 5         307 (FAIR).
OUTLOOK FOR SUN JUL 6         211 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 NW 2-4 MPH.         N 5-6 MPH.
TRANSPORT WINDS               NW 4-8 MPH.         N 6-8 MPH.
MIXING HEIGHT                 4000 FT MSL.        5500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUL 5         GOOD.
OUTLOOK FOR SUN JUL 6         GOOD.

VENTILATION INDEX (CATEGORY)  59 (POOR).          102 (POOR).
OUTLOOK FOR SAT JUL 5         260 (POOR).
OUTLOOK FOR SUN JUL 6         416 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 3-10 MPH.         W 7-13 MPH.
TRANSPORT WINDS               SW 8-12 MPH.        SW 9-16 MPH.
MIXING HEIGHT                 NEAR SURFACE.       3500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT JUL 5         FAIR.
OUTLOOK FOR SUN JUL 6         GOOD.

VENTILATION INDEX (CATEGORY)  127 (POOR).         267 (POOR).
OUTLOOK FOR SAT JUL 5         481 (FAIR).
OUTLOOK FOR SUN JUL 6         440 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      411 (FAIR)
ELLENSBURG    418 (FAIR)
GOLDENDALE    449 (FAIR)
TRI-CITIES    485 (FAIR)
WALLA WALLA   343 (FAIR)
YAKIMA        263 (POOR)
BEND          287 (POOR)
PRINEVILLE    382 (FAIR)
ENTERPRISE    152 (POOR)
HERMISTON     354 (FAIR)
JOHN DAY      309 (FAIR)
LA GRANDE     141 (POOR)
MADRAS        377 (FAIR)
MEACHAM        77 (POOR)
PENDLETON     280 (POOR)
REDMOND       396 (FAIR)
SENECA        369 (FAIR)
THE DALLES    541 (FAIR)

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.
$$