FNUS73 KDMX 051419 FWSDMX SPOT FORECAST FOR WEST CREEK PRAIRIE...USFWS NATIONAL WEATHER SERVICE DES MOINES IA 819 AM CST THU MAR 5 2009 FORECAST IS BASED ON IGNITION TIME OF 1200 CST ON MARCH 05. 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 AREA OF LOW PRESSURE IS LOCATED OFF TO THE NORTHWEST CENTERED NEAR SIOUX FALLS. SOUTH TO SOUTHWEST WINDS ARE EXPECTED AHEAD OF THIS LOW PRESSURE AREA...WITH THE BURN SITE NEAR THE AREA WHERE THE GRADIENT BEGINS TO SLACKEN. THEREFORE SUSTAINED WINDS WILL VARY SOMEWHAT AS THE SURFACE LOW AXIS MOVES THROUGH THE AREA THIS AFTERNOON AND EVENING. GUSTS ARE EXPECTED DUE TO MIXING THROUGHOUT THE DAY. WINDS WILL TURN NORTHERLY BY LATE THIS EVENING INTO THE EARLY MORNING HOURS ON FRIDAY. .TODAY... SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). MAX TEMPERATURE.....AROUND 70. MIN HUMIDITY........43 PERCENT. EYE LEVEL WINDS.....SOUTHWEST WINDS 11 TO 15 MPH. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2200 FT AGL INCREASING TO 2800 FT AGL EARLY IN THE AFTERNOON. MIXING WINDS........SOUTHWEST 16 TO 25 MPH SHIFTING TO THE SOUTH AROUND 15 MPH LATE IN THE AFTERNOON. SMOKE DISPERSAL.....GOOD (46400 KNOT-FT) INCREASING TO GOOD (59800 KNOT-FT) EARLY IN THE AFTERNOON. TIME (CST) 12P 1PM 2PM 3PM 4PM 5PM SKY (%).........22 23 25 26 30 37 WEATHER COV..... WEATHER TYPE.... TEMP............61 64 66 68 67 66 RH..............56 49 47 43 45 48 EYE LVL WND DIR.SW SW SW S SW SW EYE LVL WND SPD.11 11 11 11 10 9 EYE LVL WND GST.25 25 25 25 20 20 MIX HGT (KFT)...1.7 2.2 2.6 2.8 2.7 1.5 MIXNG WIND DIR..SW SW SW SW SW S MIXNG WIND SPD..23 24 25 24 20 15 HAINES INDEX....4 4 4 4 4 4 .TONIGHT... SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). MIN TEMPERATURE.....AROUND 41. MAX HUMIDITY........79 PERCENT. EYE LEVEL WINDS.....NORTH WINDS 6 TO 9 MPH. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......600 FT AGL. MIXING WINDS........NORTH 3 TO 9 MPH. SMOKE DISPERSAL.....POOR (4600 KNOT-FT). TIME (CST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........40 39 39 38 38 39 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............63 57 53 51 48 46 RH..............54 64 69 71 77 76 EYE LEVEL WIND..SW 7 SW 6 W 5 W 5 NW 5 N 5 EYE LEVEL WIND..15 15 10 MIX HGT (FT)....600 300 300 300 300 300 MIXNG WIND......S 9 SW 5 W 3 W 5 NW 7 NW 8 HAINES INDEX....4 4 4 4 4 4 .FRIDAY... SKY/WEATHER.........PARTLY SUNNY (45-55 PERCENT). MAX TEMPERATURE.....AROUND 61. MIN HUMIDITY........49 PERCENT. EYE LEVEL WINDS.....EAST WINDS AROUND 6 MPH. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2100 FT AGL INCREASING TO 3700 FT AGL IN THE AFTERNOON...THEN DECREASING TO 1500 FT AGL LATE IN THE AFTERNOON. MIXING WINDS........EAST 5 TO 8 MPH. SMOKE DISPERSAL.....FAIR (18600 KNOT-FT). TIME (CST) 6 AM 9 AM NOON 3 PM SKY (%).........39 42 44 54 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............45 48 56 60 RH..............76 71 55 49 EYE LEVEL WIND..N 5 N 5 NE 5 E 5 MIX HGT (FT)....300 900 2800 3700 MIXNG WIND......N 6 NE 8 NE 5 E 6 HAINES INDEX....4 4 4 5 $$ FORECASTER...ALBRECHT REQUESTED BY...GREGG PATTISON TYPE OF REQUEST...PRESCRIBED .TAG 20090305.WESTC.01/DMX