Spot Forecast Issued by NWS Des Moines, IA
000
FNUS73 KDMX 251251
FWSDMX
Spot Forecast for Larson Marsh...Story County Conservation
National Weather Service Des Moines IA
751 AM CDT Thu Apr 25 2024
Forecast is based on ignition time of 1100 CDT on April 25.
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...
Aside from a sprinkle possibility or two this morning, dry
conditions are expected to prevail through the daytime hours
before showers and storms lift into the state from the south
tonight. Expect RH values to fall into the 30s percent this
afternoon, with southeast winds around 20 mph and gusts to around
30 mph.
.REST OF TODAY...
Sky/weather.........Partly sunny (55-65 percent).
Max temperature.....Around 66.
Min humidity........36 percent.
Wind (20 ft)........Southeast winds 17 to 21 mph.
Mixing height.......4100 ft AGL.
Transport winds.....Southeast 24 to 29 mph.
Smoke dispersal.....Good (44400 knot-ft) early in the morning
increasing to excellent (99700 knot-ft) in the
afternoon.
GFDI................1.
Haines Index........4 or low potential for large plume dominated
fire growth.
TIME (CDT) 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........62 60 60 60 53 54 58
Weather cov.....
Weather type....
Tstm cov........
Temp............57 60 63 64 65 65 66
RH..............53 49 44 43 40 38 36
20 FT wind dir..SE SE SE SE SE SE SE
20 FT wind spd..17 18 18 20 21 20 21
20 FT wind gust.24 25 25 26 28 28 28
Mix hgt (kft)...2.1 2.7 3.5 3.8 4.0 4.1 4.0
Transp wind dir.SE SE SE SE SE SE SE
Transp wind spd.24 25 25 26 26 28 29
GFDI............1 1 1 1 1 1 1
Haines index....4 4 4 4 4 4 4
SDspl kt-ft/100044 60 76 87 93 98 100
.TONIGHT...
Sky/weather.........Mostly cloudy (75-85 percent). Slight chance of
showers and thunderstorms overnight. Chance of
showers and thunderstorms overnight, then
showers and thunderstorms early in the morning.
Min temperature.....Around 48.
Max humidity........77 percent.
Wind (20 ft)........Breezy. Southeast winds 17 to 26 mph. Gusts up
to 33 mph increasing to 38 mph overnight. Gusty
and erratic winds expected near thunderstorms
overnight.
Mixing height.......800 ft AGL.
Transport winds.....Southeast 21 to 30 mph.
Smoke dispersal.....Excellent (88900 knot-ft) early in the evening
decreasing to fair (14000 knot-ft) late in the
night.
GFDI................1.
Haines Index........2 to 4 or very low to low potential for large
plume dominated fire growth.
TIME (CDT) 6 PM 8 PM 10 PM MIDNGT 2 AM 4 AM
Sky (%).........63 71 78 85 92 98
Weather cov..... S CHC CHANCE CHANCE
Weather type....NONE NONE NONE RNSHWR RNSHWR RNSHWR
Tstm cov........ S CHC CHANCE CHANCE
Temp............64 59 55 53 51 50
RH..............37 44 51 57 63 71
20 ft wind......SE 18 SE 18 SE 20 SE 22 SE 24 SE 26
20 ft wind gust.28 26 31 33 37 38
Mix hgt (ft)....3600 800 800 1000 1100 1300
Transport wind..SE 29 SE 21 SE 21 SE 24 SE 28 SE 28
GFDI............1 1 1 1 1 1
Haines index....4 4 4 4 2 2
SDspl kt-ft/100089 14 15 21 27 31
.FRIDAY...
Sky/weather.........Cloudy (90-100 percent). Showers and
thunderstorms.
Max temperature.....Around 64.
Min humidity........81 percent.
Wind (20 ft)........Breezy. Southeast winds 23 to 25 mph with gusts
to around 38 mph. Gusty and erratic winds
expected near thunderstorms.
Mixing height.......1900 ft AGL.
Transport winds.....Southeast 29 to 36 mph.
Smoke dispersal.....Fair (28200 knot-ft) early in the morning
increasing to good (53100 knot-ft) in the
afternoon.
GFDI................1.
Haines Index........2 or very low potential for large plume
dominated fire growth.
TIME (CDT) 6 AM 9 AM NOON 3 PM
Sky (%).........98 96 97 95
Weather cov.....DEFNTE DEFNTE DEFNTE DEFNTE
Weather type....RNSHWR RNSHWR RNSHWR RNSHWR
Tstm cov........DEFNTE DEFNTE DEFNTE DEFNTE
Temp............48 49 53 58
RH..............83 89 89 83
20 FT wind......SE 24G38 SE 24G38 SE 25G38 SE 23G37
Mix hgt (ft)....1100 1400 1600 1500
Transport wind..SE 30 SE 33 SE 33 SE 30
GFDI............1 1 1 1
Haines index....2 2 2 2
SDspl kt-ft/100029 40 47 39
$$
Forecaster...Curtis
Requested by...Brandon Clough
Type of request...PRESCRIBED
.TAG 2412423.0/DMX
.DELDT 04/25/24
.FormatterVersion 2.0.0
.EMAIL bclough@storycountyiowa.gov