OPEN BURNING ANNOUNCEMENT MODEL GUIDANCE
800 PM PDT SUN AUG 23 2026
    NBM model output for: Salem KSLE  44.98N, -122.99W 
          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      900     020/08     020/14       12        
  Sun Aug 23rd    9:00 pm      500     010/08     010/14        7        
  Sun Aug 23rd   10:00 pm      500     010/09     010/14        7        
  Sun Aug 23rd   11:00 pm      400     360/10     010/12        5        

  Mon Aug 24th   12:00 am      400     360/10     010/12        5        
  Mon Aug 24th    1:00 am      400     360/10     010/10        4        
  Mon Aug 24th    2:00 am      400     360/09     010/10        4        
  Mon Aug 24th    3:00 am      400     360/08     010/10        4        
  Mon Aug 24th    4:00 am      400     010/07     010/10        4        
  Mon Aug 24th    5:00 am      400     010/07     010/12        5        
  Mon Aug 24th    6:00 am      400     360/07     010/08        3        
  Mon Aug 24th    7:00 am      500     350/08     010/08        4        
  Mon Aug 24th    8:00 am      700     010/08     010/10        7        
  Mon Aug 24th    9:00 am     1200     010/08     020/10       12        
  Mon Aug 24th   10:00 am     1400     010/08     020/08       11        
  Mon Aug 24th   11:00 am     1800     360/08     020/08       14        
  Mon Aug 24th   12:00 pm     2100     360/08     020/08       17        
  Mon Aug 24th    1:00 pm     2800     360/07     020/07       19        
  Mon Aug 24th    2:00 pm     3300     360/07     010/07       23        
  Mon Aug 24th    3:00 pm     3900     360/05     030/06       22        
  Mon Aug 24th    4:00 pm     4200     360/03     360/06       24        
  Mon Aug 24th    5:00 pm     4400     340/02     330/05       20        
  Mon Aug 24th    6:00 pm     3700     310/00     320/05       17        
  Mon Aug 24th    7:00 pm     1200     290/00     340/05        6        
  Mon Aug 24th    8:00 pm      400     280/00     320/06        2        
  Mon Aug 24th   11:00 pm      400     190/00     250/06        2        

  Tue Aug 25th    2:00 am      400     190/08     180/10        4        
  Tue Aug 25th    5:00 am      400     180/07     190/09        4        
  Tue Aug 25th    8:00 am      700     190/07     200/09        6        
  Tue Aug 25th   11:00 am     2200     210/08     200/09       20        
  Tue Aug 25th    2:00 pm     3700     230/09     210/10       38        Criteria Met
  Tue Aug 25th    5:00 pm     3200     250/13     250/13       41        Criteria Met
  Tue Aug 25th    8:00 pm      800     260/08     260/09        7        
  Tue Aug 25th   11:00 pm      400     230/00     210/07        3        

  Wed Aug 26th    2:00 am      500     220/00     210/06        3        
  Wed Aug 26th    5:00 am      400     200/00     200/05        2        
  Wed Aug 26th    8:00 am     1400     200/02     200/06        8        
  Wed Aug 26th   11:00 am     2500     210/05     210/06       14        
  Wed Aug 26th    2:00 pm     4000     230/05     220/06       23        
  Wed Aug 26th    5:00 pm     4500     260/10     260/10       47        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.