FNUS73 KFSD 221228 FWSFSD SPOT FORECAST FOR BISAILLION...USFWS NATIONAL WEATHER SERVICE SIOUX FALLS SD 728 AM CDT WED APR 22 2009 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...MAIN FEATURE TODAY IS A SURFACE RIDGE OF HIGH PRESSURE WHICH IS CURRENTLY LOCATED JUST EAST OF I 29. THIS RIDGE OF HIGH PRESSURE WILL NUDGE SLOWLY EASTWARD TODAY ACROSS SOUTHWEST MINNESOTA AND NORTHWEST IOWA. SO THE LIGHT NORTHWEST WINDS EARLY THIS MORNING WILL GO MORE DUE NORTH BY LATE MORNING. THEN IN THE EARLY AFTERNOON... THE WINDS WILL BECOME LIGHT AND VARIABLE AS THEY SHIFT FROM THE NORTH TO AN EASTERLY DIRECTION. FINALLY BY 2 TO 3 PM...THEY WILL SETTLE ON A SOUTH TO SOUTHEAST DIRECTION LESS THAN 10 MPH. SO LOOK FOR VARIABLE WIND DIRECTION RIGHT IN THE MIDDLE OF THE DAY. OTHERWISE... AFTERNOON TEMPERATURES IN THE 60S WILL BE COMMON WITH MINIMUM RH VALUES DROPPING TO JUST UNDER 30 PERCENT. THE OUTLOOK FOR THURSDAY IS QUITE POOR. WINDS WILL FAVOR SOUTH TO SOUTHWEST AND WILL BE STRONG AT 25 TO 35 MPH BY LATE MORNING. MAYBE EVEN SOME GUSTS APPROACHING 40 MPH IN THE AFTERNOON. IT IS ANTICIPATED THAT THE RH VALUES ON THURSDAY WILL STAY A BIT TOO HIGH FOR RED FLAG CONDITIONS...BUT AN EXTREME FIRE DANGER IS LIKELY IN THE OFFING NONETHELESS. .TODAY... MAX TEMPERATURE.....65-70. MIN HUMIDITY........28 PERCENT. TIME (CDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM SKY.............PC PC PC PC PC PC PC MCR MCR MCR MCR WEATHER TYPE.... TEMP (F)........39 43 47 50 54 57 61 63 65 67 67 RH (%)..........78 67 59 49 43 38 33 32 30 28 29 DEWPOINT (F)....33 33 33 32 32 32 32 32 33 33 33 20 FT WIND DIR..NW NW N N N NNE NNE ENE SE SSE SSE 20 FT WIND SPD..6 7 7 7 6 5 3 3 3 3 5 20 FT WIND GUST. 5 5 5 5 DISPERSAL INDEX.PR PR PR PR FR FR FR FR FR FR FR CHC OF PCPN (%).10 10 10 10 10 10 10 10 10 10 10 MIX HGT (KFT)...0.3 0.4 0.5 0.7 1.5 2.3 3.2 3.4 3.6 3.8 2.6 TRANSP WIND DIR.NW NNW NNE NE NNE N NNW NW W WSW SW TRANSP WIND SPD.9 12 14 14 13 10 8 6 6 6 8 HAINES INDEX....4 4 4 4 4 4 4 4 4 4 4 .TONIGHT... MIN TEMPERATURE.....47-52. MAX HUMIDITY........71 PERCENT. TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY.............MCLEAR MCLEAR MCLEAR PCLDY PCLDY PCLDY WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP (F)........66 63 58 56 54 52 RH (%)..........30 35 44 51 57 63 DEWPOINT (F)....34 35 36 38 39 40 20 FT WIND......SSE 7 SSE 10 SSE 13 S 17 S 20 S 20 20 FT WIND GUST. 15 15 25 30 30 DISPERSAL INDEX.FAIR POOR POOR POOR POOR POOR CHC OF PCPN (%).10 0 0 0 0 0 $$ FORECASTER...MJF REQUESTED BY...ERIC EARHART TYPE OF REQUEST...PRESCRIBED .TAG 20090422.BISAI.01/FSD