FNUS73 KFSD 061301 FWSFSD SPOT FORECAST FOR MASON...USFWS NATIONAL WEATHER SERVICE SIOUX FALLS SD 801 AM CDT WED MAY 6 2009 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... A WEAK COLD FRONT WILL REACH THE SLAYTON AREA BY ABOUT 200 PM TO 230 PM. THIS MORNING...SURFACE WINDS WILL FAVOR A SOUTH DIRECTION ABOUT ABOUT 10 MPH. BY EARLY AFTERNOON...THEY WILL FAVOR A SOUTHWEST DIRECTION THEN GO WEST TO NORTHWEST BY 2 TO 230 PM. THE TRANSPORT WINDS WILL ALSO BE SIMILAR TO THIS. ONE ITEM THIS MORNING IS PRETTY STRONG CONVECTION DEVELOPING ALONG I 90 FROM WORTHINGTON EASTWARD...WITH SMALL HAIL. IT IS ANTICIPATED THAT SLAYTON MAY BE TOO FAR NORTHWEST TO BE GREATLY IMPACTED BY OUTFLOW FROM THESE CELLS. BUT AT ANY RATE...THE CONVECTION SHOULD WANE BY 10 AM TO 1030 AM...THUS ELIMINATING THE POSSIBILITY FOR SHORT TERM ERRATIC WINDS. THE WINDS WILL INCREASE TO 15 TO 20 MPH BY MID AFTERNOON BEHIND THE FRONT...AND THERE WILL LIKELY BE A FEW ISOLATED THUNDERSTORMS. FINALLY...NOTICE AROUND NOON AND 1 PM HOW THEY WINDS MAY GET LIGHT RIGHT AHEAD OF THE FRONT...SIMILAR TO THE WINDOM AREA. .TODAY... MAX TEMPERATURE.....67-72. MIN HUMIDITY........39 PERCENT. TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM SKY.............PC PC PC PC MC MC MC PC PC PC WEATHER COV.....SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH WEATHER TYPE....RW RW RW RW RW RW RW RW TSM TSM TEMP (F)........51 53 57 60 64 67 69 70 70 70 RH (%)..........80 77 69 62 54 47 44 41 41 39 DEWPOINT (F)....45 46 47 47 47 46 46 45 45 44 20 FT WIND DIR..S SW SW WSW WSW W W W W W 20 FT WIND SPD..7 9 9 8 6 6 8 13 17 18 20 FT WIND GUST. 10 10 10 10 15 25 20 DISPERSAL INDEX.PR PR PR FR FR GD EX EX EX EX CHC OF PCPN (%).20 20 20 20 20 20 20 20 20 20 MIX HGT (KFT)...0.3 0.4 0.4 2.4 4.3 6.2 6.2 6.2 6.2 5.0 TRANSP WIND DIR.SSW SSW SSW SW WSW W W W W W TRANSP WIND SPD.7 8 9 9 8 9 13 17 22 23 HAINES INDEX....6 6 6 6 5 5 5 5 5 5 .TONIGHT... MIN TEMPERATURE.....42-47. MAX HUMIDITY........86 PERCENT. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY.............PCLDY PCLDY PCLDY PCLDY PCLDY PCLDY WEATHER COV.....S CHC WEATHER TYPE....TSTORM NONE NONE NONE NONE NONE TEMP (F)........69 63 55 52 49 47 RH (%)..........39 45 59 66 74 79 DEWPOINT (F)....43 42 41 41 41 41 20 FT WIND......WNW 17 W 14 W 8 WSW 8 WSW 8 WSW 8 20 FT WIND GUST.20 15 10 10 10 10 DISPERSAL INDEX.EXCEL FAIR POOR POOR POOR POOR .THURSDAY... MAX TEMPERATURE.....66-71. MIN HUMIDITY........36 PERCENT. TIME (CDT) 6 AM 9 AM NOON 3 PM SKY.............PCLDY PCLDY PCLDY PCLDY WEATHER TYPE....NONE NONE NONE NONE TEMP (F)........45 53 63 68 RH (%)..........86 64 44 37 DEWPOINT (F)....41 41 41 41 20 FT WIND......WSW 7G10 WSW 15G20 W 18G20 W 16G20 DISPERSAL INDEX.POOR FAIR EXCEL EXCEL CHC OF PCPN (%).10 10 10 10 MIX HGT (FT)....300 800 4500 6900 TRANSPORT WIND..WSW 8 WSW 23 W 24 W 22 HAINES INDEX....6 5 4 4 $$ FORECASTER...MJF REQUESTED BY...ERIC EARHART TYPE OF REQUEST...PRESCRIBED .TAG 20090506.MASON.01/FSD