FNUS73 KDMX 281343 FWSDMX SPOT FORECAST FOR THORN VALLEY...USFWS NATIONAL WEATHER SERVICE DES MOINES IA 843 AM CDT THU APR 28 2011 FORECAST IS BASED ON IGNITION TIME OF 1000 CDT ON APRIL 28. 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... THE LAST LOBE OF A LARGE LOW PRESSURE SYSTEM OVER THE GREAT LAKES IS ROTATING THROUGH EASTERN IOWA TODAY. THIS WILL BRING MOSTLY CLOUDY SKIES TO THE NORTHEAST HALF OF THE STATE ALONG WITH ISOLATED TO SCATTERED SHOWERS. BREEZY CONDITION WILL EXIST OVER THE STATE TODAY AS WELL. HIGH PRESSURE WILL BUILD IN FOR TONIGHT AND FRIDAY DURING THE DAY. PLEASE REMEMBER TO PLACE YOUR SPOT REQUESTS FOR ANY BURNS THE NIGHT BEFORE...EVEN IF IT IS JUST FOR PLANNING PURPOSES. REQUESTS JUST HOURS BEFORE A BURN SHOULD BE AVOIDED. .TODAY... SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT) THEN BECOMING PARTLY SUNNY (55-65 PERCENT). SLIGHT CHANCE OF RAIN SHOWERS. MAX TEMPERATURE.....AROUND 62. MIN HUMIDITY........41 PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1700 FT AGL INCREASING TO 4200 FT AGL EARLY IN THE MORNING...THEN INCREASING TO 6400 FT AGL LATE IN THE MORNING INCREASING TO 7100 FT AGL LATE IN THE AFTERNOON DECREASING TO 3900 FT AGL. MIXING WINDS........NORTHWEST 13 TO 18 MPH INCREASING TO 25 TO 32 MPH EARLY IN THE MORNING. SMOKE DISPERSAL.....GOOD (60500 KNOT-FT) INCREASING TO EXCELLENT (170100 KNOT-FT) IN THE LATE MORNING AND AFTERNOON. WIND (20 FT)........NORTHWEST WINDS 10 TO 18 MPH WITH GUSTS TO AROUND 30 MPH INCREASING TO 16 TO 21 MPH WITH GUSTS TO AROUND 35 MPH IN THE LATE MORNING AND AFTERNOON. TIME (CDT) 10A 11A 12P 1PM 2PM 3PM 4PM 5PM 6PM SKY (%).........81 77 69 65 65 66 66 57 39 WEATHER COV.....ISO ISO ISO SCH SCH SCH SCH SCH SCH WEATHER TYPE....RW RW RW RW RW RW RW RW RW TEMP............48 50 53 52 55 58 61 61 62 RH..............63 61 54 56 51 45 41 41 41 20 FT WIND DIR..NW NW NW NW NW NW NW NW NW 20 FT WIND SPD..21 21 20 18 20 21 21 20 16 20 FT WIND GUST.35 35 30 30 35 35 35 25 20 MIX HGT (KFT)...3.7 4.2 4.7 5.2 5.8 6.4 7.1 5.5 3.9 MIXNG WIND DIR..NW NW NW NW NW NW NW NW NW MIXNG WIND SPD..31 32 31 29 29 28 28 29 29 HAINES INDEX....3 3 4 4 4 4 4 4 5 .TONIGHT... SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT). MIN TEMPERATURE.....AROUND 40. MAX HUMIDITY........85 PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......2300 FT AGL DECREASING TO 300 FT AGL IN THE LATE EVENING AND OVERNIGHT. MIXING WINDS........NORTHWEST 22 TO 28 MPH BECOMING NORTH 5 TO 14 MPH EARLY IN THE EVENING...THEN SHIFTING TO THE SOUTH 3 TO 6 MPH LATE IN THE EVENING. SMOKE DISPERSAL.....GOOD (55500 KNOT-FT) DECREASING TO POOR (1500 KNOT-FT) IN THE LATE EVENING AND OVERNIGHT. WIND (20 FT)........NORTHWEST WINDS 5 TO 13 MPH EARLY IN THE EVENING BECOMING LIGHT...THEN BECOMING SOUTH AROUND 5 MPH EARLY IN THE MORNING. TIME (CDT) 7 PM 9 PM 11 PM 1 AM 3 AM 5 AM SKY (%).........31 23 13 5 7 10 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TEMP............59 54 50 45 40 42 RH..............45 52 61 70 85 79 20 FT WIND......NW 13 NW 7 NW 2 NW 0 W 0 S 3 20 FT WIND GUST.20 10 5 5 MIX HGT (FT)....2300 900 300 300 300 300 MIXNG WIND......NW 28 N 14 N 5 E 3 S 5 S 5 HAINES INDEX....5 5 5 5 4 3 .FRIDAY... SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT). MAX TEMPERATURE.....AROUND 72. MIN HUMIDITY........42 PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......1700 FT AGL INCREASING TO 5300 FT AGL. MIXING WINDS........SOUTH 5 TO 12 MPH INCREASING TO SOUTHEAST 26 TO 33 MPH. SMOKE DISPERSAL.....POOR (11700 KNOT-FT) INCREASING TO EXCELLENT (106500 KNOT-FT). WIND (20 FT)........SOUTHEAST WINDS 7 TO 15 MPH INCREASING TO 17 TO 22 MPH LATE IN THE MORNING. TIME (CDT) 7 AM 10 AM 1 PM 4 PM SKY (%).........12 29 46 57 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TEMP............43 57 67 69 RH..............76 51 42 42 20 FT WIND......SE 7 SE 13G15 SE 18G30 SE 22G30 MIX HGT (FT)....300 1700 5300 4500 MIXNG WIND......S 5 S 15 S 21 SE 26 HAINES INDEX....4 5 5 5 $$ FORECASTER...BOKSA REQUESTED BY...JAMES KRIZMAN TYPE OF REQUEST...PRESCRIBED .TAG 20110428.THORN.01/DMX