FNUS73 KFSD 291204 FWSFSD SPOT FORECAST FOR BIG SLOUGH NE...U.S. FISH & WILDLIFE NATIONAL WEATHER SERVICE SIOUX FALLS SD 704 AM CDT FRI MAY 29 2009 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...WEAK HIGH PRESSURE WILL DRIFT ACROSS THE AREA TODAY. MIXING OF FLOW ALOFT THIS MORNING WILL KEEP GENERALLY NORTHERLY WINDS. HOWEVER...BY THIS AFTERNOON... WINDS ARE LIKELY TO BE MORE ERRATIC AND MAY BE DRIVEN BY LOCAL TOPOGRAPHY. ANOTHER COLD FRONT WILL FOLLOW LATE TONIGHT...WITH STRONGER NORTH WINDS ON SATURDAY. SCATTERED THUNDERSTORMS WILL ACCOMPANY THE FRONTAL BOUNDARY THROUGH THE BURN AREA TONIGHT. WITH THE LIGHTHER WINDS...SMOKE DISPERSION WILL TAKE UNTIL AROUND 11 AM TO REACH THE FAIR CATEGORY...WITH GOOD DISPERSION BY 1 PM. .TODAY... MAX TEMPERATURE.....74-79. MIN HUMIDITY........29 PERCENT. TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY COVER.......MC MC MC MC MC MC MC MC MC MC MC PC WEATHER COV..... WEATHER TYPE.... TEMP............52 54 56 59 63 67 70 73 75 76 76 76 RH..............66 57 55 53 46 40 35 32 29 30 31 31 DEWPOINT........41 39 40 42 42 42 41 41 41 42 43 43 20 FT WIND DIR..N N NNE NNE NNE NNE N N NW WNW WNW WNW 20 FT WIND SPD..7 7 7 7 7 7 6 6 6 6 6 7 20 FT WIND GUST. SMOKE DISPERSAL.PR PR PR PR FR FR GD GD GD GD GD GD CHC OF PCPN (%).10 10 10 10 10 10 10 10 10 10 10 10 MIX HGT (KFT)...0.3 0.5 0.7 0.9 2.1 3.3 4.5 5.0 5.6 6.2 6.2 6.2 TRANSP WIND DIR.N NNE NNE NE NNE N N NNW WNW W WNW WNW TRANSP WIND SPD.8 8 9 9 9 9 9 10 12 13 13 12 HAINES INDEX....5 5 5 5 5 5 5 5 5 5 5 5 .TONIGHT... MIN TEMPERATURE.....50-55. MAX HUMIDITY........86 PERCENT. TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY COVER.......PCLDY MCLDY MCLDY MCLDY MCLDY MCLDY WEATHER COV..... SCTTRD SCTTRD ISOLTD WEATHER TYPE....NONE NONE NONE RNSHWR RNSHWR RNSHWR TEMP............75 66 59 57 55 54 RH..............33 45 57 64 72 80 DEWPOINT........44 44 44 45 46 48 20 FT WIND......NW 7 W 5 WSW 2 SW 1 N 5 N 6 20 FT WIND GUST. SMOKE DISPERSAL.GOOD POOR POOR POOR POOR POOR CHC OF PCPN (%).10 10 10 30 30 20 $$ FORECASTER...CHAPMAN REQUESTED BY...ERIC EARHART TYPE OF REQUEST...PRESCRIBED .TAG 20090529.BIGSL.01/FSD