870 FNUS73 KDMX 110312 FWSDMX Spot Forecast for Chodur-Irons...Worth County Conservation National Weather Service Des Moines IA 912 PM CST Sun Dec 10 2017 Forecast is based on ignition time of 0900 CST on December 11. If conditions become unrepresentative...contact the National Weather Service. An initial observation at ignition and a mid burn observation are required. Please relay them to the National Weather Service for each prescribed burn. .DISCUSSION... Clouds will thicken and scattered rain and/or snow showers may arrive by later in the morning into the afternoon. Winds from the southwest early in the day will become gusty from the northwest by mid-morning continuing into the evening. Minimum relative humidities Monday afternoon will be around 80% with good recovery Monday night. Temperatures will be above freezing from 11 am to around 2 pm Monday. Observed frost depths of several inches have been reported across the area, though local conditions may vary. .MONDAY... Sky/weather.........Cloudy (85-95 percent). Slight chance of rain late in the morning. Chance of snow through the day. Chance of rain in the afternoon. Max temperature.....Around 35. Min humidity........81 percent. Wind (20 ft)........Northwest winds 12 to 20 mph. Mixing height.......1100-2700 ft AGL. Transport winds.....Northwest 17 to 23 mph increasing to north 28 to 36 mph late in the morning. Haines Index........2 to 4 or very low potential for large plume dominated fire growth to low potential for large plume dominated fire growth. TIME (CST) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM SKY (%).........83 87 92 96 94 92 90 85 81 WEATHER COV.....SCH CHC CHC CHC CHC CHC SCH SCH SCH WEATHER TYPE....SN SN SN RN SN SN SN SN SN TSTM COV........ TEMP............31 32 34 35 34 34 32 31 28 RH..............85 85 82 82 82 82 85 81 88 20 FT WIND DIR..W NW NW NW NW NW NW NW N 20 FT WIND SPD..12 14 16 18 20 20 20 20 20 20 FT WIND GUST. 20 25 30 30 30 30 30 30 MIX HGT (KFT)...1.1 1.6 2.1 2.6 2.2 1.8 1.4 2.0 2.7 MIXNG WIND DIR..W NW NW NW NW N N N N MIXNG WIND SPD..17 23 28 32 35 36 36 36 36 HAINES INDEX....3 3 2 2 2 3 3 3 4 .MONDAY NIGHT... Sky/weather.........Mostly cloudy (60-70 percent) then becoming partly cloudy (35-45 percent). Min temperature.....Around 12. Max humidity........91 percent. Wind (20 ft)........Northwest winds 15 to 23 mph. Mixing height.......1400-3300 ft AGL decreasing to 300-800 ft AGL after midnight. Transport winds.....Northwest 28 to 36 mph decreasing to 21 to 25 mph after midnight. Haines Index........4 or low potential for large plume dominated fire growth. TIME (CST) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM SKY (%).........76 55 47 42 32 31 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE NONE NONE TSTM COV........ TEMP............28 24 21 18 15 13 RH..............81 84 84 84 88 87 20 FT WIND......NW 23 NW 23 NW 21 NW 17 NW 15 NW 15 20 FT WIND GUST.30 30 30 25 20 20 MIX HGT (FT)....3300 2800 2300 2000 800 300 MIXNG WIND......N 36 NW 35 NW 32 NW 30 NW 25 NW 22 HAINES INDEX....4 4 4 4 4 4 .TUESDAY... Sky/weather.........Mostly sunny (40-50 percent). Max temperature.....Around 26. Min humidity........60 percent. Wind (20 ft)........Northwest winds 10 to 15 mph. Mixing height.......300-2200 ft AGL increasing to 2300-2800 ft AGL in the afternoon. Transport winds.....Northwest 12 to 20 mph shifting to the west around 9 mph late in the afternoon. Haines Index........3 to 4 or very low potential for large plume dominated fire growth to low potential for large plume dominated fire growth. TIME (CST) 6 AM 9 AM NOON 3 PM SKY (%).........39 35 49 56 WEATHER COV..... WEATHER TYPE....NONE NONE NONE NONE TSTM COV........ TEMP............12 14 23 26 RH..............87 88 65 62 20 FT WIND......NW 15G20 NW 14G20 NW 14G20 NW 14G20 MIX HGT (FT)....300 1100 2800 2800 MIXNG WIND......NW 20 NW 18 NW 20 NW 14 HAINES INDEX....4 4 4 4 $$ Forecaster...Ansorge Requested by...Brett Backhaus Type of request...PRESCRIBED .TAG 1719801.0/DMX .EMAIL brett.backhaus@worthcounty.org