FNUS73 KDMX 181656 FWSDMX SPOT FORECAST FOR BIG CREEK NE UNIT...IOWA DNR NATIONAL WEATHER SERVICE DES MOINES IA 1156 AM CDT WED MAR 18 2009 FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON MARCH 19. 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 MOVING BY TO THE NORTHEAST WILL RESULT IN LIGHT WINDS OF AROUND 10 MPH GRADUALLY TURNING FROM NORTH TO EAST ON THURSDAY. RELATIVE HUMIDITY WILL GRADUALLY INCREASE DURING THE MORNING AND NO PRECIPITATION IS EXPECTED. .THURSDAY... SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT). TEMPERATURE.........39 AT IGNITION...MAX 52. RH..................64 PERCENT AT IGNITION...MIN 42 PERCENT. EYE LEVEL WINDS.....EAST WINDS 5 TO 6 MPH. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2000 FT AGL INCREASING TO 4200 FT AGL LATE IN THE MORNING...THEN INCREASING TO 5700 FT AGL EARLY IN THE AFTERNOON DECREASING TO 2300 FT AGL LATE IN THE AFTERNOON. MIXING WINDS........SOUTHWEST 2 TO 8 MPH. SMOKE DISPERSAL.....FAIR (14300 KNOT-FT). TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY (%).........27 21 16 13 15 19 23 27 30 WEATHER COV..... WEATHER TYPE.... TEMP............39 42 45 47 49 50 51 51 50 RH..............64 57 53 49 46 44 42 42 44 EYE LVL WND DIR.N N N N N NE NE E E EYE LVL WND SPD.4 4 4 4 5 5 5 5 5 EYE LVL WND GST.10 10 10 10 10 10 10 10 10 MIX HGT (KFT)...1.3 2.0 2.7 3.4 4.2 5.0 5.7 4.0 2.3 MIXNG WIND DIR..NE NE N N N NW W W SW MIXNG WIND SPD..8 7 6 5 3 2 2 2 3 HAINES INDEX....4 4 5 5 5 5 5 5 5 .THURSDAY NIGHT... SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT) THEN BECOMING MOSTLY CLOUDY (50-60 PERCENT). TEMPERATURE.........MIN 32. RH..................MAX 82 PERCENT. EYE LEVEL WINDS.....SOUTHEAST WINDS 6 TO 7 MPH. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......500 FT AGL. MIXING WINDS........SOUTHEAST 5 TO 7 MPH. SMOKE DISPERSAL.....POOR (2100 KNOT-FT). TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY (%).........32 32 33 33 41 52 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............48 43 41 39 37 35 RH..............47 57 65 70 75 82 EYE LEVEL WIND..E 5 E 5 SE 5 SE 5 SE 6 SE 6 EYE LEVEL WIND..10 10 10 10 10 15 MIX HGT (FT)....500 300 300 300 300 300 MIXNG WIND......S 5 SE 6 SE 7 SE 7 SE 7 SE 6 HAINES INDEX....5 4 4 4 4 4 .FRIDAY... SKY/WEATHER.........PARTLY SUNNY (55-65 PERCENT). TEMPERATURE.........MAX 56. RH..................MIN 43 PERCENT. EYE LEVEL WINDS.....SOUTH WINDS 7 TO 14 MPH. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2200 FT AGL INCREASING TO 4600 FT AGL IN THE AFTERNOON...THEN DECREASING TO 1700 FT AGL LATE IN THE AFTERNOON. MIXING WINDS........SOUTH 7 TO 14 MPH INCREASING TO 29 TO 33 MPH. SMOKE DISPERSAL.....FAIR (25400 KNOT-FT) INCREASING TO EXCELLENT (89900 KNOT-FT) LATE IN THE MORNING...THEN INCREASING TO EXCELLENT (129900 KNOT-FT) IN THE AFTERNOON DECREASING TO GOOD (51100 KNOT-FT) LATE IN THE AFTERNOON. TIME (CDT) 7 AM 10 AM 1 PM 4 PM SKY (%).........59 55 51 63 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............35 41 50 55 RH..............82 67 50 43 EYE LEVEL WIND..SE 6G15 S 8G15 S 10G20 S 10G25 MIX HGT (FT)....300 300 3200 4600 MIXNG WIND......SE 7 S 18 S 32 S 32 HAINES INDEX....5 5 5 5 $$ FORECASTER...LEE REQUESTED BY...IOWA DNR TYPE OF REQUEST...PRESCRIBED .TAG 20090319.BIGCR.01/DMX