FNUS73 KFSD 201240 FWSFSD SPOT FORECAST FOR BROKEN KETTLE GRASSLANDS...THE NATURE CONSERVANCY NATIONAL WEATHER SERVICE SIOUX FALLS SD 740 AM CDT FRI APR 20 2012 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... WEAK HIGH PRESSURE WILL SETTLE ACROSS THE AREA THIS AFTERNOON...WHICH WILL GENERALLY KEEP WINDS FAIRLY LIGHT...AND THUS SMOKE DISPERSION A BIT LOWER TODAY. THE INCREASED MIXING DEPTH BY AROUND IGNITION TIME SHOULD ALLOW FOR A GOOD SMOKE DISPERSION RATING FOR MOST OF THE EARLY TO MID AFTERNOON. HOWEVER...ATTEMPTS TO MIX DOWN A MORE NORTHEAST WIND ALOFT MAY CREATE SOME PERIODS OF ERRATIC LIGHT WINDS FOR THE WEST EXPOSURE. THERE WILL BE A CHANCE FOR SOME VERY LIGHT WETTING RAINFALL VERY LATE TONIGHT AND EARLY SATURDAY. .TODAY... MAX TEMPERATURE.....56-61. MIN HUMIDITY........36 PERCENT. TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY COVER.......PC MC MC MC MC MC MC MC MC MC PC PC % SKY COVER.....45 59 72 86 79 73 66 61 57 53 47 42 WEATHER COV..... WEATHER TYPE.... TEMP............35 38 43 48 51 53 55 57 58 59 59 58 RH..............86 79 69 60 55 50 47 45 44 44 45 44 DEWPOINT........31 33 35 35 35 35 35 35 36 36 37 37 20 FT WIND DIR..N N N N N N N N N NNW NNW NW 20 FT WIND SPD..6 7 7 8 8 8 8 8 8 8 8 8 20 FT WIND GUST. 10 10 10 10 10 10 10 10 10 SMOKE DISPERSAL.PR PR PR PR FR FR GD GD GD GD FR PR CHC OF PCPN (%).0 0 10 10 10 10 10 10 10 10 10 10 MIX HGT (KFT)...0.3 0.6 0.9 1.3 2.1 3.0 3.9 4.2 4.5 4.8 3.3 1.8 TRANSP WIND DIR.N N N N N N N NNW NNW NNW NW NW TRANSP WIND SPD.5 8 12 13 14 13 12 10 10 9 9 9 HAINES INDEX....4 4 4 4 4 3 3 3 4 4 4 4 .TONIGHT... MIN TEMPERATURE.....38-43. MAX HUMIDITY........81 PERCENT. TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY COVER.......PCLDY PCLDY MCLDY MCLDY MCLDY CLOUDY % SKY COVER.....36 43 56 72 83 91 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............57 52 47 44 42 41 RH..............46 54 62 73 79 81 DEWPOINT........37 36 34 36 36 36 20 FT WIND......NW 8 E 7 SE 7 SSE 8 SSE 8 SSE 10 20 FT WIND GUST.10 10 10 15 SMOKE DISPERSAL.POOR POOR POOR POOR POOR POOR CHC OF PCPN (%).0 0 0 10 10 10 .SATURDAY... MAX TEMPERATURE.....66-71. MIN HUMIDITY........32 PERCENT. TIME (CDT) 7 AM 10 AM 1 PM 4 PM SKY COVER.......CLOUDY CLOUDY MCLDY PCLDY % SKY COVER.....95 90 81 36 WEATHER COV.....S CHC WEATHER TYPE....RNSHWR NONE NONE NONE TEMP............43 55 66 68 RH..............77 56 40 37 DEWPOINT........36 39 42 41 20 FT WIND......S 15G20 SSW 16G25 W 18G25 NW 24G35 SMOKE DISPERSAL.POOR POOR GOOD EXCEL CHC OF PCPN (%).20 10 10 10 MIX HGT (FT)....300 400 2200 4900 TRANSPORT WIND..S 17 SSW 29 WNW 29 NW 35 HAINES INDEX....4 4 5 4 WEATHER TYPE ABBREVIATIONS 1) T = THUNDERSTORMS 2) R = RAIN 3) RW = RAIN SHOWERS 4) L = DRIZZLE 5) ZR = FREEZING RAIN 6) ZL = FREEZING DRIZZLE 7) S = SNOW 8) SW = SNOW SHOWERS 9) IP = ICE PELLETS 10) F = FOG 11) ZF = FREEZING FOG 12) IC = ICE CRYSTALS 13) H = HAZE 14) BS = BLOWING SNOW 15) K = SMOKE 16) BD = BLOWING DUST 17) FR = FROST $$ FORECASTER...CHAPMAN REQUESTED BY...EMILY HOHMAN TYPE OF REQUEST...PRESCRIBED .TAG 20120420.BROKE.01/FSD