


Daily Dispersion Outlook
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
874 AUUS46 KPDT 151225 DDOPDT DAILY DISPERSION OUTLOOK NATIONAL WEATHER SERVICE PENDLETON OR 525 AM PDT SUN JUN 15 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 6-12 MPH. W 5-9 MPH. TRANSPORT WINDS SW 7-13 MPH. W 5-9 MPH. MIXING HEIGHT NEAR SURFACE. 6500 FT MSL. DISPERSION CATEGORY POOR. FAIR. OUTLOOK FOR MON JUN 16 FAIR. OUTLOOK FOR TUE JUN 17 GOOD. VENTILATION INDEX (CATEGORY) 101 (POOR). 294 (POOR). OUTLOOK FOR MON JUN 16 391 (FAIR). OUTLOOK FOR TUE JUN 17 754 (GOOD). FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP... SELAH...AND NACHES AREA 7:00 AM AFTERNOON SURFACE WINDS W 3-7 MPH. SE 3-6 MPH. TRANSPORT WINDS NW 5-10 MPH. SW 5-7 MPH. MIXING HEIGHT NEAR SURFACE. 8500 FT MSL. DISPERSION CATEGORY POOR. POOR. OUTLOOK FOR MON JUN 16 FAIR. OUTLOOK FOR TUE JUN 17 FAIR. VENTILATION INDEX (CATEGORY) 80 (POOR). 267 (POOR). OUTLOOK FOR MON JUN 16 460 (FAIR). OUTLOOK FOR TUE JUN 17 380 (FAIR). FOR THE GRANDE RONDE RIVER VALLEY 7:00 AM AFTERNOON SURFACE WINDS NW 2-5 MPH. NW 8-11 MPH. TRANSPORT WINDS NW 6-10 MPH. NW 8-11 MPH. MIXING HEIGHT 4000 FT MSL. 9500 FT MSL. DISPERSION CATEGORY POOR. GOOD. OUTLOOK FOR MON JUN 16 GOOD. OUTLOOK FOR TUE JUN 17 GOOD. VENTILATION INDEX (CATEGORY) 126 (POOR). 460 (FAIR). OUTLOOK FOR MON JUN 16 299 (POOR). OUTLOOK FOR TUE JUN 17 439 (FAIR). FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS 7:00 AM AFTERNOON SURFACE WINDS S 3-8 MPH. NW 6-8 MPH. TRANSPORT WINDS SW 6-11 MPH. NW 6-8 MPH. MIXING HEIGHT NEAR SURFACE. 6000 FT MSL. DISPERSION CATEGORY POOR. FAIR. OUTLOOK FOR MON JUN 16 FAIR. OUTLOOK FOR TUE JUN 17 GOOD. VENTILATION INDEX (CATEGORY) 86 (POOR). 261 (POOR). OUTLOOK FOR MON JUN 16 312 (FAIR). OUTLOOK FOR TUE JUN 17 618 (GOOD). SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES CLE ELUM 341 (FAIR) ELLENSBURG 352 (FAIR) GOLDENDALE 419 (FAIR) TRI-CITIES 256 (POOR) WALLA WALLA 212 (POOR) YAKIMA 268 (POOR) BEND 366 (FAIR) PRINEVILLE 405 (FAIR) ENTERPRISE 335 (FAIR) HERMISTON 264 (POOR) JOHN DAY 594 (FAIR) LA GRANDE 431 (FAIR) MADRAS 265 (POOR) MEACHAM 221 (POOR) PENDLETON 292 (POOR) REDMOND 371 (FAIR) SENECA 612 (GOOD) THE DALLES 408 (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. $$