019  
FNUS73 KFSD 221401  
FWSFSD  
 
SPOT FORECAST FOR SONG HAWK CRP...SD-YAA  
NATIONAL WEATHER SERVICE SIOUX FALLS SD  
901 AM CDT SAT APR 22 2017  
 
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
THE MAIN WEATHER FEATURE TODAY IS HIGH PRESSURE. EARLY THIS MORNING,  
IT CURRENTLY EXTENDS FROM SOUTHWEST NEBRASKA TO EAST CENTRAL SOUTH  
DAKOTA. BECAUSE OF THIS, SOUTH CENTRAL TO SOUTHEAST SOUTH DAKOTA IS  
EXPERIENCING VERY LIGHT WINDS THIS MORNING, TRYING TO BECOME OUT OF  
A WEST TO NORTHWEST DIRECTION. YOUR OBSERVATION IS SHOWING CALM  
WINDS WHICH MAKES SENSE. THEREFORE THE WIND DIRECTIONS THIS MORNING  
COULD BE A BIT VARIABLE AS LOCAL TERRAIN INFLUENCES COULD OUT WEIGH  
THE INFLUENCES OF THE HIGH PRESSURE SYSTEM. HOWEVER THE HIGH WILL  
TRACK A BIT FURTHER EASTWARD LATE THIS MORNING AND AFTERNOON. THIS  
WILL BEND THE WINDS AROUND TO A SOUTHWEST DIRECTION BY MIDDAY AND  
EARLY AFTERNOON. WIND SPEEDS TOWARD MIDDAY AND AFTERNOON WILL BE IN  
THE 5 TO 10 MPH RANGE. ONE THING TO WATCH FOR IS SMOKE DISPERSION.  
IT WILL BE POOR TO FAIR TODAY. THE MIXING HEIGHTS ARE HIGH, BUT  
THE TRANSPORT WINDS ARE LIGHT.  
 
SUNDAY WILL BE A BREEZY DAY, WITH SOUTHWEST WINDS OF 20 TO 30 MPH  
IN YOUR AREA.  
 
   
TODAY
 
 
MAX TEMPERATURE.....63-68.  
MIN HUMIDITY........29 PERCENT.  
 
TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY COVER.......CLR CLR CLR CLR CLR CLR CLR CLR CLR CLR  
SKY (%).........3 1 1 2 2 3 2 2 3 2  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............43 48 53 57 59 61 63 64 65 66  
DEWPOINT........38 38 38 38 37 36 35 34 33 33  
RH..............82 68 57 49 44 39 35 32 30 29  
20 FT WIND DIR..WNW WNW NW NW W WSW SW SW SW SW  
20 FT WIND SPD..2 2 3 4 5 5 5 5 5 6  
20 FT WIND GUST. 5 6 8 8 9 8 9  
SMOKE DISPERSAL.PR PR PR PR FR FR FR FR FR FR  
MIX HGT (KFT)...0.8 1.3 1.8 3.0 4.3 5.5 5.6 5.7 5.9 5.8  
TRANSP WIND DIR.NNW NNW NNW NW NW WNW W W WSW WSW  
TRANSP WIND SPD.3 3 3 4 5 5 6 6 5 5  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0  
HAINES INDEX....4 4 4 4 4 4 4 4 4 4  
   
TONIGHT
 
 
MIN TEMPERATURE.....38-43.  
MAX HUMIDITY........70 PERCENT.  
 
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY COVER.......CLEAR CLEAR CLEAR CLEAR CLEAR CLEAR  
SKY (%).........2 1 0 0 1 2  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TEMP............65 60 53 49 47 44  
DEWPOINT........34 36 34 34 34 34  
RH..............31 41 48 56 60 68  
20 FT WIND......SSW 6 S 6 S 7 S 7 S 7 SSW 7  
20 FT WIND GUST. 10  
SMOKE DISPERSAL.FAIR POOR POOR POOR POOR POOR  
MIX HGT (FT)....5700 300 300 300 300 300  
TRANSPORT WIND..WSW 6 SW 7 S 8 S 8 S 8 SSW 9  
CHC OF PCPN (%).0 0 0 0 0 0  
HAINES INDEX....4 4 4 4 4 5  
   
SUNDAY
 
 
MAX TEMPERATURE.....69-74.  
MIN HUMIDITY........25 PERCENT.  
 
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY COVER.......CLEAR CLEAR MCLEAR MCLEAR MCLEAR PCLDY  
SKY (%).........3 5 7 11 17 26  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TEMP............41 45 56 63 68 72  
DEWPOINT........33 34 37 36 34 34  
RH..............73 65 49 36 28 25  
20 FT WIND......S 8 SSW 10 SSW 15 SSW 20 SSW 22 S 22  
20 FT WIND GUST.10 15 20 30 30 30  
SMOKE DISPERSAL.POOR POOR FAIR EXCEL EXCEL EXCEL  
MIX HGT (FT)....300 500 1100 3300 5100 6300  
TRANSPORT WIND..S 9 SSW 16 SSW 26 SSW 30 SSW 31 SSW 33  
CHC OF PCPN (%).0 0 0 0 0 0  
HAINES INDEX....5 5 5 4 4 5  
 

 
FORECASTER...MJ  
REQUESTED BY...JALEN BERNIE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1707384.1/FSD  
 
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