OPEN BURNING ANNOUNCEMENT MODEL GUIDANCE
800 PM PDT SUN AUG 23 2026
    NBM model output for: Eugene KEUG  44.14N, -123.21W 
          Model Run Time:  2026-08-24 02Z

                             Mixing      Sfc     Transport                                 
                   Time      Height     Winds      Winds   Ventilation                    
  Day   Date      (PDT)     (ft MSL)    (mph)      (mph)      Index       Remarks         
  === ========   ========   =======    =======    =======    =======      =======         
  Sun Aug 23rd    8:00 pm      500     360/10     010/13        6        
  Sun Aug 23rd    9:00 pm      400     360/10     010/14        6        
  Sun Aug 23rd   10:00 pm      400     360/12     010/13        5        
  Sun Aug 23rd   11:00 pm      400     360/13     010/13        5        

  Mon Aug 24th   12:00 am      400     360/12     010/13        5        
  Mon Aug 24th    1:00 am      400     360/12     360/13        5        
  Mon Aug 24th    2:00 am      400     360/10     360/13        5        
  Mon Aug 24th    3:00 am      500     360/09     010/12        6        
  Mon Aug 24th    4:00 am      400     360/09     010/10        4        
  Mon Aug 24th    5:00 am      500     360/08     010/09        5        
  Mon Aug 24th    6:00 am      400     360/08     010/09        4        
  Mon Aug 24th    7:00 am      500     360/07     010/08        4        
  Mon Aug 24th    8:00 am      800     010/07     010/10        8        
  Mon Aug 24th    9:00 am     1300     010/07     010/09       12        
  Mon Aug 24th   10:00 am     1300     010/07     020/08       10        
  Mon Aug 24th   11:00 am     1800     010/07     020/07       12        
  Mon Aug 24th   12:00 pm     2000     360/07     010/07       14        
  Mon Aug 24th    1:00 pm     2400     360/07     010/07       17        
  Mon Aug 24th    2:00 pm     2800     350/06     350/06       16        
  Mon Aug 24th    3:00 pm     3400     340/05     300/06       20        
  Mon Aug 24th    4:00 pm     4000     330/03     280/06       23        
  Mon Aug 24th    5:00 pm     4400     300/00     280/07       30        
  Mon Aug 24th    6:00 pm     3500     270/00     290/07       24        
  Mon Aug 24th    7:00 pm     1400     270/00     280/08       11        
  Mon Aug 24th    8:00 pm      400     250/00     270/09        4        
  Mon Aug 24th   11:00 pm      400     210/10     210/10        4        

  Tue Aug 25th    2:00 am      300     200/09     210/09        3        
  Tue Aug 25th    5:00 am      400     200/06     210/06        2        
  Tue Aug 25th    8:00 am      800     210/06     220/07        6        
  Tue Aug 25th   11:00 am     2100     240/07     230/08       17        
  Tue Aug 25th    2:00 pm     3400     250/08     240/08       27        Criteria Met
  Tue Aug 25th    5:00 pm     2700     260/13     260/13       34        
  Tue Aug 25th    8:00 pm      600     250/08     240/10        6        
  Tue Aug 25th   11:00 pm      400     240/05     220/06        2        

  Wed Aug 26th    2:00 am      500     230/00     220/05        2        
  Wed Aug 26th    5:00 am      600     230/00     220/05        3        
  Wed Aug 26th    8:00 am     1400     200/02     200/03        5        
  Wed Aug 26th   11:00 am     2500     230/03     220/05       12        
  Wed Aug 26th    2:00 pm     4400     260/05     240/07       30        
  Wed Aug 26th    5:00 pm     4100     270/13     260/13       52        Criteria Met

Notes:
  Mixing Height = NBM mixing height (MHT)                               
  SFC Winds = NBM 10 meter winds                                        
  Transport Winds = NBM transport wind through the mixed layer          

Criteria (season-dependent; guidance only, forecaster judgment governs):
  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
    (excludes near-north transport, which piles smoke into the south
     end of the valley near Eugene).
  Ventilation Index = Mixing Height (ft) x Transport Wind (mph) / 1000.