790
AUUS46 KPDT 291225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT AUG 29 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS SW 13-26 MPH. W 16-23 MPH.
TRANSPORT WINDS SW 15-26 MPH. W 19-23 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY GOOD. GOOD.
OUTLOOK FOR SUN AUG 30 FAIR.
OUTLOOK FOR MON AUG 31 FAIR.
VENTILATION INDEX (CATEGORY) 284 (POOR). 1050 (GOOD).
OUTLOOK FOR SUN AUG 30 464 (FAIR).
OUTLOOK FOR MON AUG 31 188 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 7-13 MPH. W 12-18 MPH.
TRANSPORT WINDS W 8-14 MPH. W 16-19 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SUN AUG 30 FAIR.
OUTLOOK FOR MON AUG 31 POOR.
VENTILATION INDEX (CATEGORY) 191 (POOR). 1049 (GOOD).
OUTLOOK FOR SUN AUG 30 222 (POOR).
OUTLOOK FOR MON AUG 31 167 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS S 2-5 MPH. NW 14-16 MPH.
TRANSPORT WINDS W 5-9 MPH. W 15-18 MPH.
MIXING HEIGHT NEAR SURFACE. 9000 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SUN AUG 30 GOOD.
OUTLOOK FOR MON AUG 31 GOOD.
VENTILATION INDEX (CATEGORY) 134 (POOR). 842 (GOOD).
OUTLOOK FOR SUN AUG 30 426 (FAIR).
OUTLOOK FOR MON AUG 31 399 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS SW 10-23 MPH. W 16-21 MPH.
TRANSPORT WINDS SW 13-23 MPH. W 19-23 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY GOOD. GOOD.
OUTLOOK FOR SUN AUG 30 FAIR.
OUTLOOK FOR MON AUG 31 FAIR.
VENTILATION INDEX (CATEGORY) 301 (FAIR). 1048 (GOOD).
OUTLOOK FOR SUN AUG 30 482 (FAIR).
OUTLOOK FOR MON AUG 31 199 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 791 (GOOD)
ELLENSBURG 1050 (GOOD)
GOLDENDALE 1050 (GOOD)
TRI-CITIES 1050 (GOOD)
WALLA WALLA 1050 (GOOD)
YAKIMA 1050 (GOOD)
BEND 494 (FAIR)
PRINEVILLE 724 (GOOD)
ENTERPRISE 687 (GOOD)
HERMISTON 1050 (GOOD)
JOHN DAY 815 (GOOD)
LA GRANDE 927 (GOOD)
MADRAS 594 (FAIR)
MEACHAM 848 (GOOD)
PENDLETON 1050 (GOOD)
REDMOND 756 (GOOD)
SENECA 915 (GOOD)
THE DALLES 1050 (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.
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