FNUS73 KDMX 151248 FWSDMX SPOT FORECAST FOR BIG MARSH- LOWER POOL...IOWA DNR NATIONAL WEATHER SERVICE DES MOINES IA 748 AM CDT THU APR 15 2010 FORECAST IS BASED ON IGNITION TIME OF 1030 CDT ON APRIL 15. 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... AN INCREASING THREAT FOR RAIN IS EXPECTED BY MIDDAY AS A COLD FRONT PUSHES INTO THE STATE. WINDS WILL BE FROM THE SOUTHWEST FOR MUCH OF THE DAY BECOMING NORTHWEST TONIGHT. SUNNY CONDITIONS EXPECTED ON FRIDAY WITH MODERATE TO STRONG NORTHWEST WINDS. .TODAY... SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). ISOLATED SHOWERS AND THUNDERSTORMS EARLY IN THE MORNING...THEN SCATTERED SHOWERS AND THUNDERSTORMS IN THE LATE MORNING AND AFTERNOON. TEMPERATURE.........71 AT IGNITION...MAX 78. MIN HUMIDITY........57 PERCENT AT IGNITION...MIN 42 PERCENT. WIND (EYE LEVEL)....SOUTHWEST WINDS 8 TO 16 MPH. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1800 FT AGL INCREASING TO 3800 FT AGL LATE IN THE MORNING...THEN INCREASING TO 4900 FT AGL IN THE AFTERNOON DECREASING TO 2300 FT AGL LATE IN THE AFTERNOON. MIXING WINDS........SOUTHWEST 13 TO 21 MPH INCREASING TO 21 TO 24 MPH IN THE LATE MORNING AND AFTERNOON. SMOKE DISPERSAL.....POOR (22800 KNOT-FT) INCREASING TO EXCELLENT (103000 KNOT-FT). TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY (%).........72 75 78 80 80 81 81 81 82 WEATHER COV.....SCT SCT SCT SCT SCT SCT SCT SCT SCT WEATHER TYPE....RW RW RW RW RW RW RW RW RW TEMP............69 71 73 74 75 76 77 76 74 RH..............57 53 49 48 46 43 42 43 46 EYE LVL WND DIR.SW SW SW SW SW SW SW SW SW EYE LVL WND SPD.12 13 12 12 12 12 11 10 9 EYE LVL WND GST.25 30 25 25 30 30 30 25 20 MIX HGT (KFT)...1.8 2.8 3.8 4.9 4.9 4.9 4.9 3.6 2.3 MIXNG WIND DIR..SW SW SW SW SW SW SW SW SW MIXNG WIND SPD..24 24 23 22 23 24 24 23 21 HAINES INDEX....3 3 4 4 4 4 4 4 4 .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT) THEN BECOMING PARTLY CLOUDY (40-50 PERCENT). CHANCE OF SHOWERS AND THUNDERSTORMS IN THE EVENING. MIN TEMPERATURE.....46. MAX HUMIDITY........83 PERCENT. WIND (EYE LEVEL)....NORTHWEST WINDS 8 TO 10 MPH. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1000 FT AGL. MIXING WINDS........WEST 10 TO 18 MPH SHIFTING TO THE NORTHWEST 8 TO 13 MPH IN THE LATE EVENING AND OVERNIGHT. SMOKE DISPERSAL.....POOR (15700 KNOT-FT). TIME (CDT) 7 PM 10 PM 1 AM 4 AM SKY (%).........82 70 58 46 WEATHER COV.....CHANCE CHANCE WEATHER TYPE....RNSHWR RNSHWR NONE NONE TEMP............70 60 55 51 RH..............53 69 80 80 EYE LEVEL WIND..W 8G20 W 7G15 NW 6G15 NW 6G15 MIX HGT (FT)....1000 300 300 300 MIXNG WIND......SW 18 W 8 NW 13 NW 9 HAINES INDEX....4 3 4 3 .FRIDAY... SKY/WEATHER.........SUNNY (20-30 PERCENT). MAX TEMPERATURE.....61. MIN HUMIDITY........28 PERCENT. WIND (EYE LEVEL)....NORTH WINDS 9 TO 14 MPH. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2300 FT AGL INCREASING TO 6200 FT AGL. MIXING WINDS........NORTH 15 TO 23 MPH INCREASING TO 26 TO 29 MPH IN THE LATE MORNING AND AFTERNOON. SMOKE DISPERSAL.....FAIR (47300 KNOT-FT) INCREASING TO EXCELLENT (144300 KNOT-FT). TIME (CDT) 7 AM 11 AM 3 PM SKY (%).........35 30 21 WEATHER COV..... WEATHER TYPE....NONE NONE NONE TEMP............48 55 60 RH..............77 47 31 EYE LEVEL WIND..NW 7G15 N 10G25 N 11G25 MIX HGT (FT)....400 4300 6200 MIXNG WIND......NW 15 N 28 N 26 HAINES INDEX....3 4 5 $$ FORECASTER...COGIL REQUESTED BY...JUSTIN CLARK TYPE OF REQUEST...PRESCRIBED .TAG 20100415.BIGMA.01/DMX