FNUS73 KFSD 191249 FWSFSD SPOT FORECAST FOR PRESCOTT PRAIRIE...CHEROKEE CCB NATIONAL WEATHER SERVICE SIOUX FALLS SD 749 AM CDT TUE MAY 19 2009 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION... A STRONG COLD FRONT IS SITUATED TO THE NORTH OF YOUR AREA...JUST NORTH OF INTERSTATE 90. THE GOOD NEWS...IS THAT THE COLD FRONT WILL NOT PUSH ANY FURTHER SOUTHWARD. THEREFORE YOUR WINDS WILL REMAIN SOUTHERLY ALL DAY. THE BAD NEWS...IS THAT IT WILL BECOME QUITE WINDY. STOUT WINDS OF 35 KNOTS EXIST NEAR THE TOP OF THE MIXED LAYER...COUPLED WITH A TIGHT SURFACE PRESSURE GRADIENT. THEREFORE WIND SPEEDS WILL RISE INTO THE 20 TO 30 MPH RANGE BY MIDDAY...AND INCREASE FURTHER TO 25 TO 35 MPH BY MID AFTERNOON. DUE TO MUCH ABOVE NORMAL TEMPERATURES...RH VALUES WILL ALSO FALL TO NEAR 30 PERCENT BY MID AFTERNOON. IT WILL STILL BE WINDY THIS EVENING...AND BREEZY OVERNIGHT. THEN WE ARE LOOKING AT ANOTHER HOT AND VERY WINDY DAY ON WEDNESDAY IN YOUR AREA AHEAD OF A COLD FRONT PASSAGE. CHANCES FOR SHOWERS AND THUNDERSTORMS WILL FINALLY ARRIVE LATER WEDNESDAY NIGHT AND THURSDAY MORNING. .TODAY... MAX TEMPERATURE.....85-90. MIN HUMIDITY........30 PERCENT. TIME (CDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM SKY.............MCR MCR MCR CLR MCR MCR MCR MCR MCR MCR WEATHER TYPE.... TEMP (F)........66 70 73 77 81 84 86 87 87 87 RH (%)..........65 55 48 43 39 37 34 31 30 30 DEWPOINT (F)....54 53 52 53 54 55 54 53 52 52 20 FT WIND DIR..S S S S S S S S SSW S 20 FT WIND SPD..12 16 17 18 20 21 23 26 26 29 20 FT WIND GUST.15 25 25 30 30 30 30 35 35 40 DISPERSAL INDEX.PR PR FR GD GD GD EX EX EX EX CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 MIX HGT (KFT)...0.5 0.8 1.1 1.5 1.9 2.3 2.8 3.4 3.9 3.8 TRANSP WIND DIR.S S S S S S SSW SSW SSW SSW TRANSP WIND SPD.15 21 25 28 29 30 32 36 38 41 HAINES INDEX....6 6 6 6 6 6 6 5 5 5 .TONIGHT... MIN TEMPERATURE.....59-64. MAX HUMIDITY........75 PERCENT. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY.............MCLEAR CLEAR CLEAR CLEAR CLEAR CLEAR WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP (F)........87 82 71 67 65 64 RH (%)..........30 34 51 63 70 75 DEWPOINT (F)....52 51 52 54 55 56 20 FT WIND......S 29 S 26 S 26 S 25 S 23 S 22 20 FT WIND GUST.40 40 35 35 30 30 DISPERSAL INDEX.EXCEL EXCEL POOR FAIR FAIR FAIR CHC OF PCPN (%).0 0 0 0 0 0 .WEDNESDAY... MAX TEMPERATURE.....85-90. MIN HUMIDITY........31 PERCENT. TIME (CDT) 6 AM 9 AM NOON 3 PM SKY.............CLEAR CLEAR CLEAR MCLEAR WEATHER TYPE....NONE NONE NONE NONE TEMP (F)........63 69 81 87 RH (%)..........75 57 37 31 DEWPOINT (F)....55 53 52 53 20 FT WIND......S 22G30 S 26G35 S 32G45 S 33G45 DISPERSAL INDEX.GOOD GOOD EXCEL EXCEL CHC OF PCPN (%).0 0 0 0 MIX HGT (FT)....1000 1600 2900 4000 TRANSPORT WIND..S 41 S 47 SSW 49 SSW 48 HAINES INDEX....5 5 5 5 $$ FORECASTER...MJF REQUESTED BY...LUCAS STRAW TYPE OF REQUEST...PRESCRIBED .TAG 20090519.PRESC.01/FSD