FNUS73 KDMX 211435 FWSDMX SPOT FORECAST FOR BLACKMUN PRAIRIE...IOWA DNR NATIONAL WEATHER SERVICE DES MOINES IA 935 AM CDT WED APR 21 2010 FORECAST IS BASED ON IGNITION TIME OF 1215 CDT ON APRIL 21. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. PLEASE REMEMBER TO SUBMIT A MID BURN OBSERVATION TO THE NATIONAL WEATHER SERVICE FOR EACH PRESCRIBED BURN. .DISCUSSION... A WEAK BOUNDARY NEAR THE MINNESOTA IOWA BORDER WILL DRIFT SOUTHWARD TODAY...BUT STALL OUT IN THE VICINITY OF THE BURN. THEREFORE...WINDS WILL BE LIGHT AND VARIABLE. .TODAY... SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT). TEMPERATURE.........71 AT IGNITION...MAX 73. MIN HUMIDITY........28 PERCENT AT IGNITION...MIN 29 PERCENT. WIND (EYE LEVEL)....LIGHT WINDS BECOMING SOUTH AROUND 5 MPH LATE IN THE AFTERNOON...THEN SHIFTING TO THE EAST AROUND 6 MPH LATE IN THE AFTERNOON. HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......700 FT AGL INCREASING TO 3400 FT AGL LATE IN THE MORNING...THEN INCREASING TO 6200 FT AGL LATE IN THE MORNING INCREASING TO 10300 FT AGL EARLY IN THE AFTERNOON INCREASING TO 13200 FT AGL DECREASING TO 11100 FT AGL LATE IN THE AFTERNOON. MIXING WINDS........NORTHWEST 5 TO 7 MPH. SMOKE DISPERSAL.....MARGINAL (37700 KNOT-FT) INCREASING TO GOOD (79400 KNOT-FT) IN THE AFTERNOON. TIME (CDT) 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY (%).........29 29 31 36 41 45 50 WEATHER COV..... WEATHER TYPE.... TEMP............69 71 72 73 72 71 70 RH..............28 26 25 24 25 26 26 EYE LVL WND DIR.NW NW W SW S S E EYE LVL WND SPD.2 2 2 3 4 4 5 EYE LVL WND GST. 5 5 5 5 MIX HGT (KFT)...6.2 8.9 10 12 13 12 11 MIXNG WIND DIR..NW NW NW NW NW NW NW MIXNG WIND SPD..7 7 7 7 7 7 6 HAINES INDEX....6 6 6 5 5 5 5 .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (45-55 PERCENT) THEN BECOMING PARTLY CLOUDY (30-40 PERCENT). MIN TEMPERATURE.....43. MAX HUMIDITY........79 PERCENT. WIND (EYE LEVEL)....NORTHEAST WINDS 5 TO 7 MPH. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......10000 FT AGL DECREASING TO 700 FT AGL. MIXING WINDS........NORTHEAST 6 TO 9 MPH. SMOKE DISPERSAL.....FAIR (49800 KNOT-FT). TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY (%).........52 42 28 18 21 23 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............67 60 56 52 49 47 RH..............29 42 51 59 66 74 EYE LEVEL WIND..NE 5 NE 5 NE 6 N 5 NE 4 NE 4 EYE LEVEL WIND.. 10 10 10 5 5 MIX HGT (FT)....10000 3500 400 700 400 300 MIXNG WIND......N 6 NE 8 NE 8 NE 6 NE 6 NE 6 HAINES INDEX....5 4 4 3 3 3 .THURSDAY... SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). MAX TEMPERATURE.....68. MIN HUMIDITY........39 PERCENT. WIND (EYE LEVEL)....SOUTH WINDS 5 TO 6 MPH. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1600 FT AGL INCREASING TO 7100 FT AGL. MIXING WINDS........SOUTHEAST AROUND 7 MPH SHIFTING TO THE SOUTHWEST 6 TO 7 MPH LATE IN THE MORNING. SMOKE DISPERSAL.....FAIR (38300 KNOT-FT). TIME (CDT) 7 AM 10 AM 1 PM 4 PM SKY (%).........20 25 31 38 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............45 55 63 67 RH..............79 57 43 39 EYE LEVEL WIND..E 5 E 5 SE 5G10 SE 5 MIX HGT (FT)....300 1600 5400 7100 MIXNG WIND......E 7 E 7 S 6 SW 6 HAINES INDEX....3 3 4 4 $$ FORECASTER...MOYER REQUESTED BY...JUSTIN CLARK TYPE OF REQUEST...PRESCRIBED .TAG 20100421.BLACK.01/DMX