146
AUUS46 KPDT 301225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SAT AUG 30 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 4-9 MPH. N 4-7 MPH.
TRANSPORT WINDS S 6-11 MPH. W 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SUN AUG 31 FAIR.
OUTLOOK FOR MON SEP 1 FAIR.
VENTILATION INDEX (CATEGORY) 53 (POOR). 179 (POOR).
OUTLOOK FOR SUN AUG 31 151 (POOR).
OUTLOOK FOR MON SEP 1 187 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS NW 3-7 MPH. E 3-6 MPH.
TRANSPORT WINDS NW 5-9 MPH. S 4-8 MPH.
MIXING HEIGHT NEAR SURFACE. 8000 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR SUN AUG 31 FAIR.
OUTLOOK FOR MON SEP 1 POOR.
VENTILATION INDEX (CATEGORY) 43 (POOR). 207 (POOR).
OUTLOOK FOR SUN AUG 31 202 (POOR).
OUTLOOK FOR MON SEP 1 173 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 2-4 MPH. S 3-5 MPH.
TRANSPORT WINDS S 2-4 MPH. SW 11-12 MPH.
MIXING HEIGHT 4000 FT MSL. 13500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR SUN AUG 31 GOOD.
OUTLOOK FOR MON SEP 1 GOOD.
VENTILATION INDEX (CATEGORY) 38 (POOR). 871 (GOOD).
OUTLOOK FOR SUN AUG 31 1050 (GOOD).
OUTLOOK FOR MON SEP 1 977 (GOOD).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 4-9 MPH. N 5-6 MPH.
TRANSPORT WINDS S 6-11 MPH. SW 6-10 MPH.
MIXING HEIGHT NEAR SURFACE. 7500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR SUN AUG 31 FAIR.
OUTLOOK FOR MON SEP 1 FAIR.
VENTILATION INDEX (CATEGORY) 57 (POOR). 286 (POOR).
OUTLOOK FOR SUN AUG 31 293 (POOR).
OUTLOOK FOR MON SEP 1 155 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 371 (FAIR)
ELLENSBURG 404 (FAIR)
GOLDENDALE 314 (FAIR)
TRI-CITIES 129 (POOR)
WALLA WALLA 216 (POOR)
YAKIMA 285 (POOR)
BEND 924 (GOOD)
PRINEVILLE 645 (GOOD)
ENTERPRISE 710 (GOOD)
HERMISTON 114 (POOR)
JOHN DAY 1050 (GOOD)
LA GRANDE 772 (GOOD)
MADRAS 365 (FAIR)
MEACHAM 656 (GOOD)
PENDLETON 241 (POOR)
REDMOND 602 (GOOD)
SENECA 1050 (GOOD)
THE DALLES 234 (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.
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