883 
FNUS73 KBIS 301331
FWSBIS

Spot Forecast for PDL-1...National Park Service
National Weather Service Bismarck ND
831 AM CDT Sun Apr 30 2017

Forecast is based on ignition time of 1100 CDT on April 30. 
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...Weak high pressure will remain over the area today between
low pressure over eastern Montana and another area of low pressure over 
the central plains. Expect light winds this morning, becoming east southeast
5 to 10 mph at ignition time. Winds area expected to remain easterly through 
the afternoon around 10 mph with some gusts up to 15 mph. Minimum humidity
this afternoon is expected to be around 25 percent. 

.REST OF TODAY...

Sky/weather.........Mostly sunny. 
CWR.................0 percent. 
Chance of pcpn......0 percent. 
LAL.................1. 
Max temperature.....Around 63. 
Min humidity........24 percent. 
Wind (20 ft)........East winds up to 9 mph. 
Mixing height.......4700-6500 ft AGL increasing to 6800-7000 ft AGL 
                    late in the afternoon. 
Transport winds.....East 6 to 13 mph. 
Smoke dispersal.....Fair to excellent (23500-61900 knot-ft) 
                    increasing to excellent (74600 knot-ft) late in 
                    the afternoon. 
Haines Index........4 to 5 (low) to (moderate). 

TIME (CDT)      11A 12P 1PM 2PM 3PM 4PM 5PM 
Sky (%).........2   2   7   11  18  9   12  
Weather cov.....                            
Weather type....                            
Tstm cov........                            
CWR.............0   0   0   0   0   0   0   
Chc of pcpn (%).0   0   0   0   0   0   0   
LAL.............1   1   1   1   1   1   1   
Temp............55  58  61  62  63  63  62  
RH..............38  32  27  25  24  24  26  
20 FT wind dir..SE  SE  E   E   E   E   E   
20 FT wind spd..5   6   7   8   9   10  9   
20 FT wind gust.10      10  10  10  15  15  
Mix hgt (kft)...4.7 5.4 5.9 6.5 6.9 7.0 6.8 
Transp wind dir.NE  NE  E   E   E   E   E   
Transp wind spd.6   6   10  10  10  13  13  
Haines index....5   5   5   5   4   4   4    

.TONIGHT...

Sky/weather.........Mostly clear. 
CWR.................0 percent. 
Chance of pcpn......0 percent. 
LAL.................1. 
Min temperature.....Around 33. 
Max humidity........82 percent. 
Wind (20 ft)........East winds up to 8 mph in the evening becoming 
                    light, then becoming northeast up to 5 mph 
                    after midnight. 
Mixing height.......4900-6100 ft AGL decreasing to 200-600 ft AGL. 
Transport winds.....Northeast 5 to 13 mph. 
Smoke dispersal.....Fair to excellent (26100-67000 knot-ft) 
                    decreasing to poor (800 knot-ft) in the late 
                    evening and overnight. 

TIME (CDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM 
Sky (%).........12  16  14  12  12  9   9   8   13  19  24  35  
Weather cov.....                                                
Weather type....                                                
Tstm cov........                                                
CWR.............0   0   0   0   0   0   0   0   0   0   0   0   
Chc of pcpn (%).0   0   0   0   0   0   0   0   0   0   0   0   
LAL.............1   1   1   1   1   1   1   1   1   1   1   1   
Temp............61  58  54  49  45  42  41  40  39  38  36  34  
RH..............27  32  38  46  55  62  65  67  70  70  72  78  
20 FT wind dir..E   E   E   E   E   E   E   E   NE  NE  NE  NE  
20 FT wind spd..8   8   6   6   5   4   4   5   5   5   5   5   
20 FT wind gust.10  10  10          5   5   10  10  10  10  10  
Mix hgt (kft)...6.1 4.9 3.3 1.6 0.3 0.3 0.3 0.3 0.3 0.3 0.2 0.6 
Transp wind dir.E   E   E   E   E   E   E   NE  NE  NE  NE  NE  
Transp wind spd.13  9   9   9   5   5   5   6   6   6   6   6   
Haines index....4   4   4   5   5   5   5   5   5   5   5   5      

.MONDAY...

Sky/weather.........Partly sunny. 
CWR.................0 percent. 
Chance of pcpn......10 percent. 
LAL.................1. 
Max temperature.....Around 59. 
Min humidity........32 percent. 
Wind (20 ft)........North winds up to 9 mph. 
Mixing height.......1000-2600 ft AGL increasing to 3800-5100 ft AGL 
                    late in the morning, then increasing to 
                    6300-7500 ft AGL in the afternoon decreasing to 
                    5400 ft AGL late in the afternoon. 
Transport winds.....Northeast 6 to 9 mph shifting to the northwest 
                    6 to 12 mph in the afternoon. 
Smoke dispersal.....Poor to good (4800-37300 knot-ft) increasing to 
                    good to excellent (54100-69300 knot-ft) late in 
                    the afternoon. 
Haines Index........4 to 5 (low) to (moderate). 

TIME (CDT)      6 AM      9 AM      NOON      3 PM      
Sky (%).........46        42        52        63        
Weather cov.....                                        
Weather type....NONE      NONE      NONE      NONE      
Tstm cov........                                        
CWR.............0         0         0         0         
Chc of pcpn (%).0         0         0         10        
LAL.............1         1         1         1         
Temp............33        41        52        58        
RH..............82        65        39        32        
20 FT wind......N 5G10    N 6       N 6       N 8G10    
Mix hgt (ft)....1000      2200      5100      7500      
Transport wind..NE 6      NE 9      NE 8      NW 6      
Haines index....5         5         4         4                 

$$
Forecaster...HAMILTON
Requested by...Skalsky
Type of request...PRESCRIBED
.TAG 1708024.1/BIS
.EMAIL rod_skalsky@nps.gov