178  
FNUS73 KFSD 261511  
FWSFSD  
 
SPOT FORECAST FOR TWIN LAKES RX...SD GFP  
NATIONAL WEATHER SERVICE SIOUX FALLS SD  
1011 AM CDT WED APR 26 2017  
 
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
SKIES WILL CLEAR SOME ON THURSDAY LEAVING PARTLY TO MOSTLY SUNNY  
SKIES FOR THE DAY. SURFACE WIND WILL BE FROM THE NORTHWEST AROUND  
10 TO 15 MPH, THEN SHIFT TO THE NORTH AFTER SUNSET. THURSDAY  
MORNING TEMPERATURES WILL START OUT BELOW FREEZING AND WARM TO THE  
LOWER 50S BY THE AFTERNOON.  
 
OUR NEXT CHANCE OF RAIN ARRIVES SATURDAY NIGHT THROUGH SUNDAY.  
TEMPERATURES MAY BE COLD ENOUGH TO SUPPORT SNOW IN SOME AREAS.  
   
THURSDAY
 
 
MAX TEMPERATURE.....49-54.  
MIN HUMIDITY........41 PERCENT.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY COVER.......MC MC MC MC PC PC PC PC PC MCR MCR MCR  
SKY (%).........78 78 65 52 41 39 37 35 31 22 17 17  
WEATHER COV.....  
WEATHER TYPE....  
TEMP............27 27 29 33 37 40 43 46 48 49 51 52  
DEWPOINT........26 25 26 26 26 26 27 27 28 28 29 29  
RH..............96 89 85 74 64 56 52 48 46 43 43 41  
20 FT WIND DIR..NNW NNW NNW NNW NNW NNW NNW NNW NNW NNW NNW N  
20 FT WIND SPD..13 12 12 13 13 13 13 13 13 13 12 10  
20 FT WIND GUST.15 15 15 15 20 20 15 15 15 15 15 15  
SMOKE DISPERSAL.PR PR FR FR GD GD GD GD GD GD GD GD  
MIX HGT (KFT)...0.3 0.3 1.2 2.1 3.0 3.4 3.8 4.2 4.2 4.3 4.4 4.4  
TRANSP WIND DIR.NNW NNW NNW NNW NNW NNW NNW NNW NNW NNW NNW NNW  
TRANSP WIND SPD.13 13 15 18 21 21 20 18 17 17 16 15  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
HAINES INDEX....2 2 2 2 2 2 2 2 2 3 3 3  
   
THURSDAY NIGHT
 
 
MIN TEMPERATURE.....27-32.  
MAX HUMIDITY........90 PERCENT.  
 
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM  
SKY COVER.......MCLEAR MCLEAR MCLEAR PCLDY PCLDY PCLDY  
SKY (%).........15 14 14 29 33 30  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TEMP............52 48 41 37 34 32  
DEWPOINT........30 30 31 31 29 28  
RH..............43 49 68 80 81 85  
20 FT WIND......N 9 N 8 NNE 7 NE 6 NE 6 NE 6  
20 FT WIND GUST.10 10  
SMOKE DISPERSAL.GOOD FAIR POOR POOR POOR POOR  
MIX HGT (FT)....4500 3100 400 300 300 300  
TRANSPORT WIND..NNW 14 N 10 NNE 9 NE 7 NE 7 NE 7  
CHC OF PCPN (%).0 0 0 0 0 0  
HAINES INDEX....3 3 4 4 4 3  
   
FRIDAY
 
 
MAX TEMPERATURE.....51-56.  
MIN HUMIDITY........37 PERCENT.  
 
TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM  
SKY COVER.......PCLDY PCLDY PCLDY MCLDY MCLDY MCLDY  
SKY (%).........41 43 35 56 61 55  
WEATHER COV.....  
WEATHER TYPE....NONE NONE NONE NONE NONE NONE  
TEMP............30 34 42 49 52 53  
DEWPOINT........28 28 29 28 28 28  
RH..............92 79 59 44 40 38  
20 FT WIND......NE 6 NE 8 NE 10 NE 12 NE 12 NNE 13  
20 FT WIND GUST. 10 15 15 15 15  
SMOKE DISPERSAL.POOR M M M M M  
MIX HGT (FT)....300 M M M M M  
TRANSPORT WIND..NE 7 M M M M M  
CHC OF PCPN (%).0 0 0 0 10 10  
HAINES INDEX....3 M M M M M  
 

 
FORECASTER...SALLY  
REQUESTED BY...ADAM SEDIVY  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1707808.0/FSD  
 
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