


Daily Dispersion Outlook
Issued by NWS Pendleton, OR
Issued by NWS Pendleton, OR
576 AUUS46 KPDT 021111 DDOPDT DAILY DISPERSION OUTLOOK NATIONAL WEATHER SERVICE PENDLETON OR 411 AM PDT WED APR 2 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 11-17 MPH. SW 13-19 MPH. TRANSPORT WINDS SW 11-16 MPH. SW 13-19 MPH. MIXING HEIGHT NEAR SURFACE. 7500 FT MSL. DISPERSION CATEGORY FAIR. GOOD. OUTLOOK FOR THU APR 3 FAIR. OUTLOOK FOR FRI APR 4 POOR. VENTILATION INDEX (CATEGORY) 88 (POOR). 631 (GOOD). OUTLOOK FOR THU APR 3 294 (POOR). OUTLOOK FOR FRI APR 4 184 (POOR). FOR THE UPPER YAKIMA VALLEY INCLUDING YAKIMA...UNION GAP... SELAH...AND NACHES AREA 7:00 AM AFTERNOON SURFACE WINDS W 4-7 MPH. W 6-10 MPH. TRANSPORT WINDS W 4-8 MPH. W 7-9 MPH. MIXING HEIGHT NEAR SURFACE. 8000 FT MSL. DISPERSION CATEGORY POOR. FAIR. OUTLOOK FOR THU APR 3 POOR. OUTLOOK FOR FRI APR 4 POOR. VENTILATION INDEX (CATEGORY) 28 (POOR). 421 (FAIR). OUTLOOK FOR THU APR 3 207 (POOR). OUTLOOK FOR FRI APR 4 183 (POOR). FOR THE GRANDE RONDE RIVER VALLEY 7:00 AM AFTERNOON SURFACE WINDS SW 4-7 MPH. NW 11-15 MPH. TRANSPORT WINDS W 6-9 MPH. NW 11-15 MPH. MIXING HEIGHT NEAR SURFACE. 7500 FT MSL. DISPERSION CATEGORY POOR. FAIR. OUTLOOK FOR THU APR 3 FAIR. OUTLOOK FOR FRI APR 4 GOOD. VENTILATION INDEX (CATEGORY) 97 (POOR). 477 (FAIR). OUTLOOK FOR THU APR 3 416 (FAIR). OUTLOOK FOR FRI APR 4 393 (FAIR). FOR THE BASE OF THE NORTHERN BLUE MOUNTAINS 7:00 AM AFTERNOON SURFACE WINDS SW 11-16 MPH. SW 12-19 MPH. TRANSPORT WINDS SW 11-17 MPH. W 11-17 MPH. MIXING HEIGHT NEAR SURFACE. 6500 FT MSL. DISPERSION CATEGORY FAIR. FAIR. OUTLOOK FOR THU APR 3 FAIR. OUTLOOK FOR FRI APR 4 POOR. VENTILATION INDEX (CATEGORY) 138 (POOR). 604 (GOOD). OUTLOOK FOR THU APR 3 347 (FAIR). OUTLOOK FOR FRI APR 4 237 (POOR). SELECT AFTERNOON FORECAST VENTILATION INDICES FOR SOME CITIES CLE ELUM 626 (GOOD) ELLENSBURG 745 (GOOD) GOLDENDALE 827 (GOOD) TRI-CITIES 522 (FAIR) WALLA WALLA 555 (FAIR) YAKIMA 475 (FAIR) BEND 347 (FAIR) PRINEVILLE 658 (GOOD) ENTERPRISE 425 (FAIR) HERMISTON 689 (GOOD) JOHN DAY 424 (FAIR) LA GRANDE 589 (FAIR) MADRAS 536 (FAIR) MEACHAM 474 (FAIR) PENDLETON 739 (GOOD) REDMOND 704 (GOOD) SENECA 473 (FAIR) THE DALLES 1034 (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. $$