261 FNUS73 KDMX 040846 FWSDMX Spot Forecast for Harmon Lake-Mountain...IA DNR National Weather Service Des Moines IA 346 AM CDT Fri May 4 2018 Forecast is based on ignition time of 0000 CDT on May 04. 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... Some drier air to mix down across the northern portion of the area this afternoon with RH values dropping into the 25 to 30 percent range. Some gustiness in the winds today with the lower RH leading to slightly elevated fire danger values today across the north. However these values should be limited by wetter fuels from the rainfall over the past few days. .TODAY... Sky/weather.........Mostly sunny (20-30 percent). Max temperature.....Around 74. Min humidity........27 percent. Wind (20 ft)........Northwest winds 7 to 15 mph increasing to 12 to 17 mph in the afternoon. Mixing height.......300-1300 ft AGL increasing to 7200-8600 ft AGL. Transport winds.....West 7 to 14 mph increasing to northwest 21 to 28 mph. Haines Index........3 to 5 or very low potential for large plume dominated fire growth or moderate potential for large plume dominated fire growth. TIME (CDT) 6 AM 8 AM 10 AM NOON 2 PM 4 PM Sky (%).........51 21 2 1 1 2 Weather cov..... Weather type....NONE NONE NONE NONE NONE NONE Tstm cov........ Temp............47 51 62 70 74 74 RH..............93 80 56 39 30 27 20 ft wind......W 7 W 8 W 10 NW 15 NW 17 NW 14 20 ft wind gust.13 14 17 23 23 18 Mix hgt (ft)....300 600 1300 5200 7700 8600 Transport wind..W 9 W 8 W 14 NW 23 NW 28 N 24 Haines index....5 4 3 4 5 5 .TONIGHT... Sky/weather.........Mostly clear (20-30 percent). Min temperature.....Around 50. Max humidity........77 percent. Wind (20 ft)........Southwest winds 6 to 10 mph. Mixing height.......6400-7100 ft AGL decreasing to 300 ft AGL. Transport winds.....West 7 to 16 mph shifting to the south 6 to 8 mph in the late evening and overnight. Haines Index........5 or moderate potential for large plume dominated fire growth. TIME (CDT) 6 PM 9 PM MIDNGT 3 AM Sky (%).........7 7 15 32 Weather cov..... Weather type....NONE NONE NONE NONE Tstm cov........ Temp............72 64 56 55 RH..............30 45 62 64 20 FT wind......NW 10G13 SW 6G9 SW 7G10 SW 7G13 Mix hgt (ft)....7100 2300 300 300 Transport wind..NW 16 SW 7 SW 7 S 8 Haines index....5 5 5 5 .SATURDAY... Sky/weather.........Mostly sunny (40-50 percent). Slight chance of showers and thunderstorms late in the afternoon. Max temperature.....Around 79. Min humidity........32 percent. Wind (20 ft)........Southwest winds 6 to 10 mph. Gusty and erratic winds expected near thunderstorms late in the afternoon. Mixing height.......300-1400 ft AGL increasing to 7400-9000 ft AGL. Transport winds.....West 7 to 14 mph. Haines Index........3 to 5 or very low potential for large plume dominated fire growth or moderate potential for large plume dominated fire growth. TIME (CDT) 6 AM 10 AM 2 PM Sky (%).........43 53 46 Weather cov..... Weather type....NONE NONE NONE Tstm cov........ Temp............50 66 78 RH..............77 50 33 20 FT wind......SW 6G8 SW 8 SW 10G15 Mix hgt (ft)....300 1400 8100 Transport wind..S 7 SW 10 W 10 Haines index....5 3 4 $$ Forecaster...Beerends Requested by...Alex Fosado Type of request...PRESCRIBED .TAG 1808826.0/DMX .EMAIL alex.fosado@dnr.iowa.gov