FNUS73 KFSD 271245 FWSFSD SPOT FORECAST FOR DIAMOND LAKE...USFWS NATIONAL WEATHER SERVICE SIOUX FALLS SD 745 AM CDT TUE APR 27 2010 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...A WEAK RIDGE OF HIGH PRESSURE WILL CONTINUE TO BUILD ACROSS THE AREA THROUGH THE DAY. IN ADVANCE OF THE RIDGE AXIS ACROSS THE BURN AREA...WINDS WILL MIX TO A STRONGER NORTH TO NORTHEAST WIND FROM LATE MORNING INTO EARLY AFTERNOON BEFORE WEAKENING. INITIAL MOISTURE IN THE SURFACE LAYER WILL QUICKLY MIX OUT WITH GOOD DRYING BY LATE MORNING AS WELL...AS DEWPOINTS FALL INTO THE UPPER 20S AND HUMIDITIES TO 30 TO 35 PERCENT. IT WILL BE A RAPID DECOUPLING TO LIGHT WINDS THIS EVENING...LIKELY BY AN HOUR OR TWO BEFORE SUNSET. INCREASING SOUTHERLY FLOW IS EXPECTED ON WEDNESDAY...AS STRONG LOW PRESSURE STARTS TO DEVELOP IN THE WESTERN PLAINS. .TODAY... MAX TEMPERATURE.....60-65. MIN HUMIDITY........33 PERCENT. TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY COVER.......PC PC PC PC PC PC MCR MCR MCR MCR MCR MCR % SKY COVER.....49 45 40 36 31 26 21 22 23 23 23 23 WEATHER COV..... WEATHER TYPE.... TEMP............36 38 43 47 51 54 57 59 60 61 62 62 RH..............81 82 70 59 50 42 36 31 29 28 29 31 DEWPOINT........31 33 34 34 33 32 30 28 28 28 29 31 20 FT WIND DIR..N N N N N N N N N N NW SW 20 FT WIND SPD..7 9 13 14 15 14 14 12 8 6 3 2 20 FT WIND GUST. 10 15 20 20 20 20 15 10 5 5 SMOKE DISPERSAL.PR PR PR FR GD GD EX EX EX GD GD FR CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0 MIX HGT (KFT)...0.3 0.7 1.1 1.6 3.2 4.7 6.3 6.6 6.9 7.2 7.1 7.0 TRANSP WIND DIR.N N N NNE NNE NNE NNE NNE N N N N TRANSP WIND SPD.14 14 14 14 14 15 15 14 12 9 7 6 HAINES INDEX....5 5 4 4 4 4 4 4 4 4 4 4 .TONIGHT... MIN TEMPERATURE.....34-39. MAX HUMIDITY........79 PERCENT. TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY COVER.......MCLEAR MCLEAR MCLEAR MCLEAR MCLEAR MCLEAR % SKY COVER.....24 21 18 17 20 25 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............61 56 49 43 40 38 RH..............35 40 52 65 73 79 DEWPOINT........33 32 32 32 32 32 20 FT WIND......SSW 2 SSE 2 SSE 5 S 7 S 8 S 8 20 FT WIND GUST. 5 10 10 SMOKE DISPERSAL.FAIR POOR POOR POOR POOR POOR CHC OF PCPN (%).0 0 0 0 0 0 .WEDNESDAY... MAX TEMPERATURE.....65-70. MIN HUMIDITY........37 PERCENT. TIME (CDT) 7 AM 10 AM 1 PM 4 PM SKY COVER.......PCLDY PCLDY PCLDY PCLDY % SKY COVER.....30 32 33 37 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............43 57 62 67 RH..............67 45 43 37 DEWPOINT........33 36 39 40 20 FT WIND......S 9G10 SSE 15G20 S 21G25 SSE 22G25 SMOKE DISPERSAL.POOR FAIR EXCEL EXCEL CHC OF PCPN (%).0 0 0 0 MIX HGT (FT)....300 1700 5800 5600 TRANSPORT WIND..S 10 S 23 S 29 SSE 32 HAINES INDEX....5 4 4 4 $$ FORECASTER...CHAPMAN REQUESTED BY...CHAD LORETH TYPE OF REQUEST...PRESCRIBED .TAG 20100427.DIAMO.01/FSD