FNUS73 KDMX 270849 FWSDMX SPOT FORECAST FOR THORN VALLEY SAVANNA...USFWS NATIONAL WEATHER SERVICE DES MOINES IA 349 AM CDT WED APR 27 2011 FORECAST IS BASED ON IGNITION TIME OF 1230 CDT ON APRIL 27. 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... UPPER LEVEL LOW PRESSURE ACROSS THE UPPER MISSISSIPPI VALLEY WILL DRIFT SLOWLY TOWARD IOWA TODAY. THIS WILL KEEP PLENTY OF CLOUDS IN PLACE BUT WITH ONLY MINIMAL CHANCES FOR PRECIPITATION IN THE FORM OF PATCHY LIGHT RAIN OR ISOLATED LIGHT RAIN SHOWERS...AND MAINLY CENTRAL AND NORTH. NORTHWEST WINDS WILL INCREASE AND BECOME GUSTY DURING THE AFTERNOON HOWEVER. .TODAY... SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). ISOLATED RAIN SHOWERS IN THE AFTERNOON. MAX TEMPERATURE.....AROUND 54. MIN HUMIDITY........52 PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......4800 FT AGL INCREASING TO 5900 FT AGL LATE IN THE MORNING...THEN DECREASING TO 3800 FT AGL LATE IN THE AFTERNOON. MIXING WINDS........NORTHWEST 20 TO 26 MPH. SMOKE DISPERSAL.....EXCELLENT (111600 KNOT-FT) INCREASING TO EXCELLENT (128900 KNOT-FT) EARLY IN THE AFTERNOON...THEN DECREASING TO EXCELLENT (127700 KNOT-FT) LATE IN THE AFTERNOON. WIND (20 FT)........NORTHWEST WINDS 12 TO 17 MPH. GUSTS UP TO 30 MPH. TIME (CDT) 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY (%).........98 97 89 74 66 68 72 WEATHER COV..... ISO ISO ISO ISO ISO ISO WEATHER TYPE.... RW RW RW RW RW RW TEMP............50 52 52 53 53 53 52 RH..............58 54 54 52 52 54 59 20 FT WIND DIR..NW NW NW NW NW NW NW 20 FT WIND SPD..16 16 16 17 17 17 16 20 FT WIND GUST.25 25 25 30 30 25 25 MIX HGT (KFT)...5.4 5.9 5.8 5.7 5.6 3.8 2.0 MIXNG WIND DIR..N N N NW NW NW NW MIXNG WIND SPD..24 24 25 26 26 26 25 HAINES INDEX....4 4 4 4 4 4 4 .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). MIN TEMPERATURE.....AROUND 40. MAX HUMIDITY........85 PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......300 FT AGL. MIXING WINDS........NORTHWEST 18 TO 23 MPH SHIFTING TO THE WEST 8 TO 17 MPH EARLY IN THE EVENING...THEN INCREASING TO 18 TO 20 MPH EARLY IN THE MORNING. SMOKE DISPERSAL.....POOR (5000 KNOT-FT). WIND (20 FT)........WEST WINDS 13 TO 16 MPH. TIME (CDT) 7 PM 10 PM 1 AM 4 AM SKY (%).........74 71 68 69 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............52 47 44 42 RH..............61 68 73 79 20 FT WIND......NW 16G20 NW 15G20 W 14G20 W 13G20 MIX HGT (FT)....300 300 300 300 MIXNG WIND......NW 23 W 8 W 13 W 18 HAINES INDEX....4 4 3 3 $$ FORECASTER...SMALL REQUESTED BY...JAMES KRIZMAN TYPE OF REQUEST...PRESCRIBED .TAG 20110427.THORN.01/DMX