665
AUUS46 KPDT 301225
DDOPDT
DAILY DISPERSION OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
525 AM PDT SUN AUG 30 2026
*** AIR DISPERSION CATEGORIES: GOOD, FAIR, POOR ***
FOR THE COLUMBIA BASIN FROM PENDLETON TO WALLA WALLA AND PASCO
7:00 AM AFTERNOON
SURFACE WINDS S 5-13 MPH. W 7-10 MPH.
TRANSPORT WINDS SW 8-15 MPH. W 8-11 MPH.
MIXING HEIGHT NEAR SURFACE. 6000 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR MON AUG 31 FAIR.
OUTLOOK FOR TUE SEP 1 FAIR.
VENTILATION INDEX (CATEGORY) 128 (POOR). 416 (FAIR).
OUTLOOK FOR MON AUG 31 249 (POOR).
OUTLOOK FOR TUE SEP 1 273 (POOR).
FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP...
SELAH...AND NACHES AREA
7:00 AM AFTERNOON
SURFACE WINDS W 0-5 MPH. SE 2-6 MPH.
TRANSPORT WINDS W 3-7 MPH. W 4-7 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. POOR.
OUTLOOK FOR MON AUG 31 FAIR.
OUTLOOK FOR TUE SEP 1 FAIR.
VENTILATION INDEX (CATEGORY) 33 (POOR). 184 (POOR).
OUTLOOK FOR MON AUG 31 221 (POOR).
OUTLOOK FOR TUE SEP 1 264 (POOR).
FOR THE GRANDE RONDE RIVER VALLEY
7:00 AM AFTERNOON
SURFACE WINDS SE 1-3 MPH. W 1-4 MPH.
TRANSPORT WINDS SW 3-6 MPH. W 7-9 MPH.
MIXING HEIGHT NEAR SURFACE. 8500 FT MSL.
DISPERSION CATEGORY POOR. GOOD.
OUTLOOK FOR MON AUG 31 GOOD.
OUTLOOK FOR TUE SEP 1 GOOD.
VENTILATION INDEX (CATEGORY) 41 (POOR). 305 (FAIR).
OUTLOOK FOR MON AUG 31 557 (FAIR).
OUTLOOK FOR TUE SEP 1 564 (FAIR).
FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS
7:00 AM AFTERNOON
SURFACE WINDS S 5-13 MPH. W 5-9 MPH.
TRANSPORT WINDS S 8-14 MPH. W 7-12 MPH.
MIXING HEIGHT NEAR SURFACE. 5500 FT MSL.
DISPERSION CATEGORY POOR. FAIR.
OUTLOOK FOR MON AUG 31 FAIR.
OUTLOOK FOR TUE SEP 1 FAIR.
VENTILATION INDEX (CATEGORY) 136 (POOR). 381 (FAIR).
OUTLOOK FOR MON AUG 31 199 (POOR).
OUTLOOK FOR TUE SEP 1 256 (POOR).
SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES
CLE ELUM 367 (FAIR)
ELLENSBURG 536 (FAIR)
GOLDENDALE 238 (POOR)
TRI-CITIES 407 (FAIR)
WALLA WALLA 443 (FAIR)
YAKIMA 169 (POOR)
BEND 137 (POOR)
PRINEVILLE 146 (POOR)
ENTERPRISE 381 (FAIR)
HERMISTON 420 (FAIR)
JOHN DAY 327 (FAIR)
LA GRANDE 319 (FAIR)
MADRAS 137 (POOR)
MEACHAM 318 (FAIR)
PENDLETON 339 (FAIR)
REDMOND 93 (POOR)
SENECA 335 (FAIR)
THE DALLES 305 (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.
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