FNUS73 KFSD 201339 FWSFSD SPOT FORECAST FOR PETERSON PRAIRIE...MN DNR NATIONAL WEATHER SERVICE SIOUX FALLS SD 839 AM CDT TUE APR 20 2010 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... A LINGERING RIDGE OF HIGH PRESSURE ACROSS THE BURN AREA WILL BRING LIGHT WINDS THROUGH MUCH OF THE DAY...LEADING TO LIGHT AND VARIABLE WINDS AND GENERALLY POOR SMOKE DISPERSION THROUGH THE DAY. WIND DIRECTION WILL BE VERY DIFFICULT TO DETERMINE... AND MAY BE DRIVEN LARGELY BY LOCAL EFFECTS. HOWEVER...BY MID AFTERNOON DEEPER MIXING SHOULD BRING A NORTHERLY COMPONENT. DRIER AIR WITH THE RIDGE AXIS SHOULD BEGIN TO MIX TO THE SURFACE BY EARLY AFTERNOON. .TODAY... MAX TEMPERATURE.....64-69. MIN HUMIDITY........24 PERCENT. TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY COVER.......PC PC PC PC PC PC PC PC PC PC PC PC % SKY COVER.....44 41 38 35 37 38 40 38 37 35 34 33 WEATHER COV..... WEATHER TYPE.... TEMP............39 45 51 56 60 62 64 65 66 67 67 66 RH..............65 62 53 45 38 33 29 27 25 24 24 26 DEWPOINT........28 33 34 35 34 32 31 30 29 29 29 30 20 FT WIND DIR..WSW W NNW NE NE ENE E ENE NE NNE N NNW 20 FT WIND SPD..2 3 2 2 2 2 2 2 1 1 2 2 20 FT WIND GUST. 5 SMOKE DISPERSAL.PR PR PR PR PR PR PR PR PR PR PR PR CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0 MIX HGT (KFT)...0.3 0.5 0.7 0.9 2.7 4.5 6.3 6.4 6.5 6.6 5.7 4.7 TRANSP WIND DIR.WSW WSW W WNW WSW S SE SSE S NE NE N TRANSP WIND SPD.3 3 2 2 2 2 2 1 1 3 3 3 HAINES INDEX....5 5 5 5 5 6 6 6 6 6 6 6 .TONIGHT... MIN TEMPERATURE.....38-43. MAX HUMIDITY........78 PERCENT. TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY COVER.......PCLDY MCLEAR MCLEAR MCLEAR MCLEAR MCLEAR % SKY COVER.....31 25 19 13 11 8 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............65 57 50 47 44 42 RH..............27 40 52 58 66 75 DEWPOINT........31 33 34 33 34 35 20 FT WIND......NNW 3 NNW 6 NNW 5 WNW 5 NW 5 NNW 5 20 FT WIND GUST.5 CHC OF PCPN (%).0 0 0 0 0 0 .WEDNESDAY... MAX TEMPERATURE.....63-68. MIN HUMIDITY........28 PERCENT. TIME (CDT) 7 AM 10 AM 1 PM 4 PM SKY COVER.......MCLEAR MCLEAR MCLEAR MCLEAR % SKY COVER.....6 8 10 18 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............42 54 62 66 RH..............77 51 36 28 DEWPOINT........35 37 34 32 20 FT WIND......WNW 6 NNW 7 NNE 10G15 NNE 9G10 SMOKE DISPERSAL.POOR POOR GOOD GOOD CHC OF PCPN (%).0 0 0 0 MIX HGT (FT)....300 300 5200 7800 TRANSPORT WIND..WNW 7 NNW 8 NNE 14 N 9 HAINES INDEX....5 5 6 6 $$ FORECASTER...CHAPMAN REQUESTED BY...BRAD BOLDUAN TYPE OF REQUEST...PRESCRIBED .TAG 20100420.PETER.01/FSD