903  
FNUS73 KABR 090124  
FWSABR  
 
SPOT FORECAST FOR PERCH LAKE WPA RX...US FISH AND WILDLIFE SERVICE  
NATIONAL WEATHER SERVICE ABERDEEN SD  
824 PM CDT THU MAY 8 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 2100 CDT ON MAY 08.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
SOUTHERLY BREEZES WILL PERSIST INTO THE OVERNIGHT  
HOURS, THEN EVENTUALLY TURN SOUTHWEST TOWARDS EARLY MORNING,  
BEFORE SWITCHING TO THE NORTH ON FRIDAY BEHIND A PASSING FRONTAL  
BOUNDARY. HUMIDITY VALUES ARE FORECAST TO STAY BELOW 60 PERCENT  
THROUGH MIDNIGHT, THEN BOTTOM OUT AROUND 25 PERCENT BY LATE  
AFTERNOON FRIDAY.  
   
REST OF TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
CHANCE OF LIGHTNING.1 PERCENT.  
MIN TEMPERATURE.....AROUND 52.  
MAX HUMIDITY........71 PERCENT.  
WIND (20 FT)........SOUTH WINDS 10 TO 13 MPH.  
MIXING HEIGHT.......400-500 FT AGL.  
TRANSPORT WINDS.....SOUTH 13 TO 16 MPH.  
SMOKE DISPERSAL.....POOR (4700 KNOT-FT).  
 
TIME (CDT) 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........14 11 16 7 5 7 14 17 37  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0  
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0  
TEMP............66 63 61 60 58 58 56 55 55  
RH..............45 50 53 53 58 60 64 66 66  
20 FT WIND DIR..S S S S S S S SW SW  
20 FT WIND SPD..13 12 12 13 13 12 10 12 10  
20 FT WIND GUST.17 17 18 17 18 20 20 20 17  
MIX HGT (KFT)...0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4  
SMOKE DISPERSAL.PR PR PR PR PR PR PR PR PR  
   
FRIDAY
 
 
SKY/WEATHER.........PARTLY SUNNY (40-50 PERCENT) THEN BECOMING  
SUNNY (0-10 PERCENT).  
CWR.................4 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
CHANCE OF LIGHTNING.9 PERCENT.  
MAX TEMPERATURE.....AROUND 80.  
MIN HUMIDITY........24 PERCENT.  
WIND (20 FT)........SOUTHWEST WINDS AROUND 9 MPH SHIFTING TO THE  
NORTHEAST 14 TO 15 MPH LATE IN THE MORNING.  
MIXING HEIGHT.......300-6200 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 13 TO 14 MPH SHIFTING TO THE NORTH 14  
TO 18 MPH LATE IN THE MORNING, THEN SHIFTING TO  
THE NORTHEAST 17 TO 20 MPH IN THE AFTERNOON.  
SMOKE DISPERSAL.....POOR (3800 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO GOOD (92800 KNOT-FT) IN THE  
AFTERNOON.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........51 76 68 48 57 32 20 21 16 14 2 4  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0 0 10 10 10 10 10  
CHC OF LTNG (%).0 0 0 0 0 0 0 10 10 10 10 10  
TEMP............54 53 57 62 69 72 75 77 78 78 78 79  
RH..............69 71 64 56 45 39 37 33 31 28 27 25  
20 FT WIND DIR..SW SW W NW N N N NE NE NE NE NE  
20 FT WIND SPD..9 9 9 12 13 14 14 14 14 14 15 15  
20 FT WIND GUST.17 16 17 18 18 20 21 20 21 21 21 20  
MIX HGT (KFT)...0.4 0.3 0.4 0.9 1.4 2.0 2.8 3.2 4.2 5.3 5.8 6.2  
SMOKE DISPERSAL.PR PR PR PR PR PR FR FR GD GD GD GD  
   
FRIDAY NIGHT
 
 
SKY/WEATHER.........CLEAR (0-10 PERCENT) THEN BECOMING MOSTLY CLEAR  
(20-30 PERCENT).  
CWR.................4 PERCENT.  
CHANCE OF PCPN......10 PERCENT.  
CHANCE OF LIGHTNING.9 PERCENT.  
MIN TEMPERATURE.....AROUND 46.  
MAX HUMIDITY........60 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 10 TO 14 MPH.  
MIXING HEIGHT.......400-6300 FT AGL.  
TRANSPORT WINDS.....NORTH 15 TO 16 MPH SHIFTING TO THE EAST EARLY  
IN THE EVENING.  
SMOKE DISPERSAL.....GOOD (88200 KNOT-FT) EARLY IN THE EVENING  
DECREASING TO POOR (5000 KNOT-FT) LATE IN THE  
NIGHT.  
 
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........3 7 27 26 32 30 31 15 17 20 22 23  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).10 10 10 10 0 0 0 0 0 0 0 0  
CHC OF LTNG (%).10 10 10 10 10 10 10 0 0 0 0 0  
TEMP............79 77 73 68 63 59 57 55 53 51 49 47  
RH..............24 26 29 33 39 45 47 49 50 52 54 58  
20 FT WIND DIR..NE NE NE NE NE NE NE E E E E E  
20 FT WIND SPD..14 13 12 12 10 10 12 12 12 12 10 10  
20 FT WIND GUST.18 18 16 16 16 16 17 17 17 17 17 16  
MIX HGT (KFT)...6.3 5.8 0.8 0.6 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4  
SMOKE DISPERSAL.GD GD PR PR PR PR PR PR PR PR PR PR  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT).  
CWR.................1 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
CHANCE OF LIGHTNING.3 PERCENT.  
MAX TEMPERATURE.....AROUND 83.  
MIN HUMIDITY........23 PERCENT.  
WIND (20 FT)........EAST WINDS 10 TO 15 MPH SHIFTING TO THE SOUTH  
16 TO 21 MPH IN THE LATE MORNING AND AFTERNOON.  
MIXING HEIGHT.......400-4900 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 16 TO 17 MPH SHIFTING TO THE SOUTH 17  
TO 21 MPH LATE IN THE MORNING.  
SMOKE DISPERSAL.....POOR (5600 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO GOOD (88400 KNOT-FT) IN THE  
AFTERNOON.  
 
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........23 19 14 10 5 6 6 7 7 7 7 7  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0  
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............46 47 50 56 61 66 70 74 77 80 81 82  
RH..............60 56 52 45 41 36 32 28 25 24 23 23  
20 FT WIND DIR..E E E SE SE SE S S S S S S  
20 FT WIND SPD..10 12 13 15 16 17 17 18 20 21 21 21  
20 FT WIND GUST.16 16 17 18 21 23 25 26 28 28 28 28  
MIX HGT (KFT)...0.4 0.4 0.9 1.4 1.8 2.2 2.6 2.9 3.6 4.3 4.9 4.4  
SMOKE DISPERSAL.PR PR PR PR PR PR FR FR GD GD GD GD  
 

 
FORECASTER...TMT  
REQUESTED BY...TODD RUZICKA  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2513587.0/ABR  
.DELDT 05/08/25  
.FORMATTERVERSION 2.0.0  
.EMAIL TODD_RUZICKA@FWS.GOV  
 
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