FNUS73 KDMX 151247 FWSDMX SPOT FORECAST FOR BIG MARSH...IOWA DNR-USFWS NATIONAL WEATHER SERVICE DES MOINES IA 747 AM CDT WED APR 15 2009 FORECAST IS BASED ON IGNITION TIME OF 0945 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... HIGH PRESSURE OVER THE WESTERN GREAT LAKES AND INTO THE MID MISSISSIPPI RIVER VALLEY WILL REMAIN IN CONTROL OVER IOWA TODAY. BY THIS AFTERNOON...EXPECT RELATIVE HUMIDITY VALUES TO DROP INTO THE MID 20S UNDER EXCELLENT MIXING CONDITIONS. THE WIND WILL GENERALLY BE OUT OF THE SOUTHEAST WITH A FEW GUSTS OVER 20 MPH POSSIBLE DURING THE AFTERNOON. .TODAY... SKY/WEATHER.........SUNNY (0-10 PERCENT). TEMPERATURE.........46 AT IGNITION...MAX 65. RH..................48 PERCENT AT IGNITION...MIN 19 PERCENT. EYE LEVEL WINDS.....LIGHT WINDS BECOMING SOUTHEAST 5 TO 9 MPH. HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1700 FT AGL INCREASING TO 6000 FT AGL. MIXING WINDS........SOUTHEAST 6 TO 14 MPH. SMOKE DISPERSAL.....EXCELLENT (61000 KNOT-FT) INCREASING TO EXCELLENT (66100 KNOT-FT) LATE IN THE AFTERNOON. TIME (CDT) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY (%).........3 2 2 2 2 2 2 2 5 10 WEATHER COV..... WEATHER TYPE.... TEMP............43 46 51 55 58 60 62 63 63 62 RH..............48 43 33 26 23 21 20 19 21 22 EYE LVL WND DIR.E E E E E E E E SE SE EYE LVL WND SPD.4 5 5 6 6 7 7 7 7 7 EYE LVL WND GST.5 10 10 15 15 15 15 15 15 MIX HGT (KFT)...0.3 0.3 1.7 3.1 4.6 5.0 5.5 6.0 5.3 4.5 MIXNG WIND DIR..SE SE SE SE E SE SE SE SE SE MIXNG WIND SPD..9 10 12 13 13 13 13 13 14 14 HAINES INDEX....5 5 5 5 5 5 5 5 5 6 .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT). TEMPERATURE.........MIN 38. RH..................MAX 70 PERCENT. EYE LEVEL WINDS.....SOUTHEAST WINDS 6 TO 9 MPH. HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......3700 FT AGL DECREASING TO 1400 FT AGL EARLY IN THE EVENING. MIXING WINDS........SOUTHEAST 7 TO 14 MPH. SMOKE DISPERSAL.....GOOD (44800 KNOT-FT). TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY (%).........13 19 26 31 35 40 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............59 53 49 46 43 41 RH..............27 38 48 60 67 70 EYE LEVEL WIND..SE 7 SE 6 SE 5 SE 5 SE 5 SE 5 EYE LEVEL WIND..15 15 10 10 10 MIX HGT (FT)....3700 1400 300 300 300 300 MIXNG WIND......SE 14 SE 10 SE 8 SE 8 SE 7 SE 7 HAINES INDEX....6 5 5 5 4 4 .THURSDAY... SKY/WEATHER.........MOSTLY SUNNY (40-50 PERCENT). TEMPERATURE.........MAX 66. RH..................MIN 35 PERCENT. EYE LEVEL WINDS.....SOUTHEAST WINDS 6 TO 14 MPH. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1800 FT AGL INCREASING TO 5700 FT AGL. MIXING WINDS........SOUTHEAST 8 TO 13 MPH INCREASING TO 16 TO 24 MPH EARLY IN THE MORNING. SMOKE DISPERSAL.....FAIR (21100 KNOT-FT) INCREASING TO EXCELLENT (91100 KNOT-FT). TIME (CDT) 7 AM 10 AM 1 PM 4 PM SKY (%).........44 38 32 45 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............41 52 60 65 RH..............70 50 41 35 EYE LEVEL WIND..SE 5G10 SE 8G15 SE 11G25 SE 10G20 MIX HGT (FT)....300 1800 4900 5700 MIXNG WIND......SE 8 SE 23 SE 21 SE 18 HAINES INDEX....4 4 5 4 $$ FORECASTER...MOYER REQUESTED BY...JUSTIN CLARK TYPE OF REQUEST...PRESCRIBED .TAG 20090415.BIGMA.02/DMX