023
FNUS73 KDMX 271326 AAA
FWSDMX

Spot Forecast for Simmons Summer Unit...UPDATED
National Weather Service Des Moines IA
826 AM CDT Wed Aug 27 2025

Forecast is based on ignition time of 0900 CDT on August 27.
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...

Mostly cloudy skies to become partly cloudy this afternoon. Gusts
up to 20mph gusts will be possible at midday. RH values will drop
into the 40s once some clearing occurs.

.REST OF TODAY...

Sky/weather.........Partly sunny (50-60 percent).
Max temperature.....Around 79.
Min humidity........42 percent.
Wind (20 ft)........South winds 7 to 12 mph.
Mixing height.......5400 ft AGL.
Transport winds.....South 14 to 16 mph.
Smoke dispersal.....Poor (11600 knot-ft) early in the morning
                    increasing to excellent (71600 knot-ft) in the
                    afternoon.
GFDI................0.

TIME (CDT)      9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........60  59  57  56  55  53  51  51  52
Weather cov.....
Weather type....
Tstm cov........
Temp............63  68  71  73  76  77  78  79  78
RH..............72  61  56  51  46  45  43  42  43
20 FT wind dir..S   S   S   S   S   S   S   S   S
20 FT wind spd..7   8   9   9   10  12  12  10  10
20 FT wind gust.        10  10  17  16  16  16  15
Mix hgt (kft)...0.9 1.3 2.4 3.6 4.4 5.1 5.4 5.4 4.9
Transp wind dir.S   S   S   S   S   S   S   S   S
Transp wind spd.15  14  16  16  16  16  15  15  16
GFDI............0   0   0   0   0   0   0   0   0
Smoke Dispersal.12  15  33  50  62  72  71  70  68
Smoke Cat.......PR  PR  PR  FR  GD  GD  GD  GD  GD

.TONIGHT...

Sky/weather.........Mostly cloudy (50-60 percent) then becoming
                    partly cloudy (40-50 percent) then becoming
                    mostly cloudy (50-60 percent).
Min temperature.....Around 56.
Max humidity........96 percent.
Wind (20 ft)........Southwest winds 5 to 9 mph in the evening and
                    overnight becoming light.
Mixing height.......400 ft AGL.
Transport winds.....Southwest 7 to 15 mph.
Smoke dispersal.....Good (59300 knot-ft) early in the evening
                    decreasing to poor (2500 knot-ft) late in the
                    night.
GFDI................0.

TIME (CDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........56  50  40  37  36  38  35  42  47  48  49  55
Weather cov.....
Weather type....
Tstm cov........
Temp............77  75  69  66  63  61  60  59  58  57  57  57
RH..............47  54  66  73  81  87  90  93  93  96  96  96
20 FT wind dir..S   S   S   S   SW  SW  SW  SW  SW  SW  SW  S
20 FT wind spd..9   7   6   6   6   6   5   5   5   3   2   2
20 FT wind gust.14  13  10  12  12  10  9   9   8   7   6   6
Mix hgt (kft)...4.6 1.3 0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
Transp wind dir.S   S   SW  SW  SW  SW  SW  SW  SW  SW  SW  SW
Transp wind spd.15  13  12  13  12  12  12  10  10  9   7   7
GFDI............0   0   0   0   0   0   0   0   0   0   0   0
Smoke Dispersal.59  15  5   5   5   5   4   4   4   3   3   3
Smoke Cat.......FR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR

.THURSDAY...

Sky/weather.........Mostly sunny (45-55 percent).
Max temperature.....Around 79.
Min humidity........60 percent.
Wind (20 ft)........Light winds becoming southeast around 5 mph
                    early in the afternoon, then becoming light
                    late in the afternoon.
Mixing height.......4400 ft AGL.
Transport winds.....South 3 to 6 mph shifting to the southeast 5 to
                    6 mph in the late morning and afternoon.
Smoke dispersal.....Poor (1600 knot-ft) early in the morning
                    increasing to fair (19000 knot-ft) in the
                    afternoon.
GFDI................0.

TIME (CDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........61  72  52  47  37  30  31  32  30  27  25  24
Weather cov.....
Weather type....
Tstm cov........
Temp............57  56  59  64  68  71  73  75  77  78  78  78
RH..............100 100 100 90  84  76  71  69  64  60  60  60
20 FT wind dir..S   SE  E   SE  SE  SE  SE  SE  SE  SE  SE  SE
20 FT wind spd..2   2   2   2   2   3   3   5   5   3   3   3
20 FT wind gust.6   5   5   5   6   7   8   9   9   9   8   7
Mix hgt (kft)...0.4 0.4 0.5 0.9 1.4 2.3 2.9 3.3 3.9 4.4 4.4 3.7
Transp wind dir.SW  S   S   SE  SE  SE  SE  SE  SE  E   E   E
Transp wind spd.6   5   3   3   5   6   6   6   6   5   5   5
GFDI............0   0   0   0   0   0   0   0   0   0   0   0
Smoke Dispersal.2   2   2   3   6   11  15  17  19  19  18  14
Smoke Cat.......PR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR  PR

$$
Forecaster...Jimenez
Requested by...Dray Walter (WL Tech I)
Type of request...PRESCRIBED
.TAG 2520762.0/DMX
.DELDT 08/27/25
.FormatterVersion 2.0.0
.EMAIL dray.walter@dnr.iowa.gov