264
AUUS46 KPDT 011225
DDOPDT

DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT FRI AUG  1 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 9-17 MPH.        SW 9-11 MPH.
TRANSPORT WINDS               SW 10-17 MPH.       SW 9-12 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SAT AUG 2         GOOD.
OUTLOOK FOR SUN AUG 3         FAIR.

VENTILATION INDEX (CATEGORY)  143 (POOR).         422 (FAIR).
OUTLOOK FOR SAT AUG 2         583 (FAIR).
OUTLOOK FOR SUN AUG 3         535 (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 6-9 MPH.
TRANSPORT WINDS               NW 6-11 MPH.        W 7-10 MPH.
MIXING HEIGHT                 NEAR SURFACE.       8500 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT AUG 2         FAIR.
OUTLOOK FOR SUN AUG 3         FAIR.

VENTILATION INDEX (CATEGORY)  89 (POOR).          411 (FAIR).
OUTLOOK FOR SAT AUG 2         408 (FAIR).
OUTLOOK FOR SUN AUG 3         298 (POOR).

FOR THE GRANDE RONDE RIVER VALLEY

                              7:00 AM             AFTERNOON
SURFACE WINDS                 SW 3-4 MPH.         W 4-5 MPH.
TRANSPORT WINDS               W 3-5 MPH.          W 6-8 MPH.
MIXING HEIGHT                 4000 FT MSL.        8000 FT MSL.
DISPERSION CATEGORY           POOR.               FAIR.
OUTLOOK FOR SAT AUG 2         GOOD.
OUTLOOK FOR SUN AUG 3         GOOD.

VENTILATION INDEX (CATEGORY)  88 (POOR).          291 (POOR).
OUTLOOK FOR SAT AUG 2         617 (GOOD).
OUTLOOK FOR SUN AUG 3         410 (FAIR).

FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS

                              7:00 AM             AFTERNOON
SURFACE WINDS                 S 6-16 MPH.         W 8-11 MPH.
TRANSPORT WINDS               SW 9-16 MPH.        SW 8-11 MPH.
MIXING HEIGHT                 NEAR SURFACE.       6000 FT MSL.
DISPERSION CATEGORY           FAIR.               FAIR.
OUTLOOK FOR SAT AUG 2         GOOD.
OUTLOOK FOR SUN AUG 3         FAIR.

VENTILATION INDEX (CATEGORY)  165 (POOR).         367 (FAIR).
OUTLOOK FOR SAT AUG 2         625 (GOOD).
OUTLOOK FOR SUN AUG 3         441 (FAIR).

SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM      571 (FAIR)
ELLENSBURG    679 (GOOD)
GOLDENDALE    533 (FAIR)
TRI-CITIES    495 (FAIR)
WALLA WALLA   392 (FAIR)
YAKIMA        490 (FAIR)
BEND          353 (FAIR)
PRINEVILLE    442 (FAIR)
ENTERPRISE    139 (POOR)
HERMISTON     399 (FAIR)
JOHN DAY      269 (POOR)
LA GRANDE     342 (FAIR)
MADRAS        476 (FAIR)
MEACHAM       280 (POOR)
PENDLETON     373 (FAIR)
REDMOND       415 (FAIR)
SENECA        372 (FAIR)
THE DALLES    632 (GOOD)

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.
$$