408
FNUS73 KDMX 180035
FWSDMX

Spot Forecast for Calkins Brush Piles...Hardin County Conservation
National Weather Service Des Moines IA
635 PM CST Wed Dec 17 2025

Forecast is based on ignition time of 2000 CST on December 17.
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.

...WIND ADVISORY IN EFFECT FROM NOON TO 6 PM CST THURSDAY...

.DISCUSSION...

Breezy to gusty south winds are expected through midnight then
gradually turning more westerly. Rain will move across the region
after midnight as well with the greatest chance after 2 pm.

.REST OF TONIGHT...

Sky/weather.........Cloudy (85-95 percent). Rain overnight.
Min temperature.....Around 33.
Max humidity........92 percent.
Wind (20 ft)........South winds 20 to 22 mph shifting to the west
                    early in the morning.
Mixing height.......500 ft AGL.
Transport winds.....South 25 to 28 mph shifting to the west 17 to
                    23 mph after 3 am.
Smoke dispersal.....Fair (14500 knot-ft) early in the evening
                    decreasing to poor (8500 knot-ft) late in the
                    night.
GFDI................5.

TIME (CST)      8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........81  87  88  94  96  97  98  99  94  95
Weather cov.....                CHC LKY DEF DEF DEF LKY
Weather type....                RN  RN  RN  RN  RN  RN
Tstm cov........
Temp............34  35  37  38  38  39  39  38  37  36
RH..............85  86  88  89  92  92  92  92  92  92
20 FT wind dir..S   S   S   S   S   SW  SW  W   W   W
20 FT wind spd..20  20  21  22  21  20  18  17  17  17
20 FT wind gust.28  28  29  26  25  24  23  22  23  22
Mix hgt (kft)...0.5 0.6 0.6 0.6 0.6 0.6 0.6 0.7 0.7 0.6
Transp wind dir.S   S   S   S   S   S   SW  W   W   W
Transp wind spd.28  28  26  26  28  26  25  23  21  17
GFDI............5   6   6   5   5   4   4   3   4   3
Smoke Dispersal.13  13  13  14  15  13  13  14  12  9
Smoke Cat.......PR  PR  PR  PR  PR  PR  PR  PR  PR  PR

.THURSDAY...

Sky/weather.........Mostly cloudy (65-75 percent) then becoming
                    partly sunny (55-65 percent). Chance of rain
                    early in the morning. Slight chance of snow in
                    the afternoon.
Max temperature.....Around 35.
Min humidity........75 percent.
Wind (20 ft)........Windy. West winds 18 to 24 mph increasing to 29
                    to 35 mph in the late morning and afternoon.
Mixing height.......3400 ft AGL.
Transport winds.....West 18 to 24 mph increasing to northwest 37 to
                    43 mph.
Smoke dispersal.....Poor (6500 knot-ft) early in the morning
                    increasing to excellent (62400 knot-ft) in the
                    afternoon increasing to excellent (82400
                    knot-ft) in the afternoon.
GFDI................8 increasing to 12 in the afternoon.

TIME (CST)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Sky (%).........89     55     47     60     76     77
Weather cov.....CHANCE               S CHC  S CHC  S CHC
Weather type....RAIN   NONE   NONE   SNOW   SNOW   SNOW
Tstm cov........
Temp............35     34     33     29     23     19
RH..............92     89     78     75     77     77
20 ft wind......W 18   W 22   W 29   W 33   W 35   NW 32
20 ft wind gust.23     28     36     40     43     41
Mix hgt (ft)....500    700    1400   3300   3100   3200
Transport wind..W 18   W 22   W 29   W 41   W 40   NW 38
GFDI............4      5      10     14     14     12
Smoke Dispersal.7      14     36     118    110    106
Smoke Cat.......POOR   POOR   POOR   VYGD   VYGD   VYGD

.THURSDAY NIGHT...

Sky/weather.........Mostly cloudy (60-70 percent) then becoming
                    partly cloudy (25-35 percent).
Min temperature.....Around 5 above.
Max humidity........80 percent.
Wind (20 ft)........Breezy. Northwest winds 21 to 28 mph decreasing
                    to around 8 mph.
Mixing height.......1400 ft AGL.
Transport winds.....Northwest 30 to 39 mph decreasing to 21 to 25
                    mph after 3 am.
Smoke dispersal.....Excellent (102600 knot-ft) early in the evening
                    decreasing to fair (24500 knot-ft) late in the
                    night.
GFDI................4.

TIME (CST)      6 PM      9 PM      MIDNGT    3 AM
Sky (%).........77        62        42        19
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
Temp............14        11        9         7
RH..............73        76        76        72
20 FT wind......NW 28G33  NW 23G33  NW 18G26  NW 13G20
Mix hgt (ft)....2900      2400      2000      1500
Transport wind..NW 38     NW 38     NW 32     NW 25
GFDI............7         6         3         2
Smoke Dispersal.94        78        55        34
Smoke Cat.......GOOD      GOOD      FAIR      POOR

$$
Forecaster...Donavon
Requested by...Nicholas Stavroplus
Type of request...PRESCRIBED
.TAG 2527721.2/DMX
.DELDT 12/17/25
.FormatterVersion 2.0.0
.EMAIL nstavroplus@hardincountyia.gov