OPEN BURNING ANNOUNCEMENT MODEL GUIDANCE 800 AM PDT TUE AUG 25 2026 NBM model output for: Eugene KEUG 44.14N, -123.21W Model Run Time: 2026-08-25 15Z Mixing Sfc Transport Time Height Winds Winds Ventilation Day Date (PDT) (ft MSL) (mph) (mph) Index Remarks === ======== ======== ======= ======= ======= ======= ======= Tue Aug 25th 9:00 am 1400 220/06 230/06 8 Tue Aug 25th 10:00 am 1800 220/07 220/07 12 Tue Aug 25th 11:00 am 2400 230/07 220/07 17 Tue Aug 25th 12:00 pm 2800 230/07 230/08 23 Tue Aug 25th 1:00 pm 3100 240/08 230/09 29 Criteria Met Tue Aug 25th 2:00 pm 3600 240/09 250/10 37 Criteria Met Tue Aug 25th 3:00 pm 3300 260/10 260/12 38 Criteria Met Tue Aug 25th 4:00 pm 3000 260/12 260/13 38 Criteria Met Tue Aug 25th 5:00 pm 2600 260/12 260/13 33 Tue Aug 25th 6:00 pm 2600 260/10 270/12 30 Tue Aug 25th 7:00 pm 1900 260/09 270/12 22 Tue Aug 25th 8:00 pm 1500 250/08 260/10 16 Tue Aug 25th 9:00 pm 500 250/07 250/08 4 Tue Aug 25th 10:00 pm 400 240/06 250/06 2 Tue Aug 25th 11:00 pm 500 220/00 230/05 2 Wed Aug 26th 12:00 am 400 220/00 230/05 2 Wed Aug 26th 1:00 am 400 220/00 240/05 2 Wed Aug 26th 2:00 am 400 230/00 240/03 1 Wed Aug 26th 3:00 am 500 230/00 240/03 2 Wed Aug 26th 4:00 am 400 210/00 230/03 1 Wed Aug 26th 5:00 am 500 200/00 210/03 2 Wed Aug 26th 6:00 am 400 190/00 210/03 1 Wed Aug 26th 7:00 am 400 190/02 200/05 2 Wed Aug 26th 8:00 am 900 200/03 200/05 4 Wed Aug 26th 9:00 am 1300 200/05 210/05 6 Wed Aug 26th 11:00 am 2400 220/05 220/06 14 Wed Aug 26th 2:00 pm 4300 240/06 230/08 35 Criteria Met Wed Aug 26th 5:00 pm 4000 270/13 260/13 51 Criteria Met Wed Aug 26th 8:00 pm 700 260/08 260/10 7 Wed Aug 26th 11:00 pm 400 240/06 240/06 2 Thu Aug 27th 2:00 am 400 220/03 230/05 2 Thu Aug 27th 5:00 am 500 210/03 220/05 2 Thu Aug 27th 8:00 am 1500 200/05 230/05 7 Thu Aug 27th 11:00 am 3500 220/05 230/06 20 Thu Aug 27th 2:00 pm 5400 250/05 250/06 31 Thu Aug 27th 5:00 pm 5500 280/09 280/09 51 Criteria Met Thu Aug 27th 8:00 pm 900 300/08 310/10 9 Thu Aug 27th 11:00 pm 500 310/00 320/05 2 Fri Aug 28th 2:00 am 400 320/00 350/03 1 Fri Aug 28th 5:00 am 400 350/00 360/03 1 Fri Aug 28th 8:00 am 1100 360/03 010/05 5 Notes: Mixing Height = NBM mixing height (MHT) SFC Winds = NBM 10 meter winds Transport Winds = NBM transport wind through the mixed layer Criteria: Field-burning season (July 5 - September 30): Mixing Height >= 3000 feet, with Surface Winds >= 5 mph and Transport Winds >= 7 mph. Rest of year: Mixing Height >= 2000 feet or Ventilation Index >= 20, with Surface Winds >= 5 mph and Transport Winds >= 7 mph. In addition (both seasons): Transport wind direction greater than 10 and less than 350 degrees. Ventilation Index = Mixing Height (ft) x Transport Wind (mph) / 1000.