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.