104
FNUS73 KOAX 271353
FWSOAX

Spot Forecast for Pisgah Unit Growing Season Rx Burn...Iowa DNR
National Weather Service Omaha/Valley NE
853 AM CDT Wed Aug 27 2025

Forecast is based on ignition time of 1200 CDT on August 27.
If conditions become unrepresentative, contact the National Weather
Service.

.DISCUSSION...

We currently do not anticipate any fire weather concerns today
into tonight. Expect increasing high level cloud cover through the
afternoon with seasonably cool temperatures peaking in the low
80s. Precipitation is not expected today. Afternoon relative
humidity values are expected to dip into the 37-42% range. Winds
will remain out of the southwest, increasing in speed this
afternoon. Afternoon winds may reach sustained speeds of 12-15
mph with gusts of 18-22 mph. Winds will calm through the evening,
gradually becoming southerly. Afternoon mixing heights are
expected to reach 4500-4750 ft, bringing very good smoke
dispersal.

Strongest Possible Wind Speeds on Day of Burn: 22 mph

Lowest Possible Relative Humidity on Day of Burn: 37 percent

.REST OF TODAY...

Sky/weather.........Mostly sunny (25-35 percent).
Max temperature.....Around 78.
Min humidity........43 percent.
Eye level winds.....South winds 6 to 7 mph. Gusts up to 20 mph
                    early in the afternoon.
Surface winds (mph).South winds 10 to 11 mph. Gusts up to 20 mph
                    early in the afternoon.
Wind (20 ft)........South winds 9 to 10 mph. Gusts up to 20 mph
                    early in the afternoon.
Mixing height.......4400 ft AGL.
Transport winds.....Southwest 17 to 20 mph.
Smoke dispersal.....Good (46700 knot-ft) early in the morning
                    increasing to excellent (74400 knot-ft) in the
                    afternoon.
GFDI................0.

TIME (CDT)      12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........24  23  26  27  34  24
Weather cov.....
Weather type....
Tstm cov........
Temp............74  76  76  77  78  77
RH..............53  48  48  45  43  45
20 FT wind dir..SW  SW  S   S   S   S
20 FT wind spd..9   9   9   9   9   8
20 FT wind gust.16  16  16  14  14  13
Eye lvl wnd dir.SW  SW  S   S   S   S
Eye lvl wnd spd.7   7   7   7   7   6
Eye lvl wnd gst.12  12  12  11  11  10
Surface wnd dir.SW  SW  S   S   S   S
Surface wnd spd.11  11  11  11  11  10
Surface wnd gst.20  20  20  18  18  16
Mix hgt (kft)...2.8 3.7 4.1 4.4 4.4 3.9
Transp wind dir.SW  SW  SW  S   S   S
Transp wind spd.18  18  20  20  18  17
GFDI............0   0   0   0   0   0
SDspl kt-ft/100047  59  69  74  71  53

.TONIGHT...

Sky/weather.........Partly cloudy (25-35 percent).
Min temperature.....Around 56.
Max humidity........100 percent.
Eye level winds.....South winds around 4 mph in the evening
                    becoming light.
Surface winds (mph).South winds 6 to 8 mph in the evening becoming
                    light.
Wind (20 ft)........South winds 5 to 6 mph in the evening becoming
                    light.
Mixing height.......300 ft AGL.
Transport winds.....Southwest 7 to 15 mph.
Smoke dispersal.....Fair (27800 knot-ft) early in the evening
                    decreasing to poor (1200 knot-ft) late in the
                    night.
GFDI................0.

TIME (CDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Sky (%).........32     37     35     19     18     22
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............76     70     65     61     60     58
RH..............50     61     73     84     87     96
20 ft wind......S 6    S 6    S 5    S 4    S 3    S 3
20 ft wind gust.12     8      10     7      6      4
Eye level wind..S 4    S 4    S 4    S 3    S 2    S 2
Eye lvl wnd gst.9      6      7      5      4      3
Surface wind....S 8    S 8    S 6    S 5    S 4    S 4
Surface wnd gst.15     10     12     9      7      5
Mix hgt (ft)....2600   400    400    400    400    300
Transport wind..S 15   S 12   S 13   SW 12  SW 10  SW 8
GFDI............0      0      0      0      0      0
SDspl kt-ft/100028     1      4      4      3      2

.THURSDAY...

Sky/weather.........Mostly sunny (30-40 percent).
Max temperature.....Around 78.
Min humidity........58 percent.
Eye level winds.....Light winds.
Surface winds (mph).Light winds.
Wind (20 ft)........Light winds.
Mixing height.......3900 ft AGL.
Transport winds.....South 3 to 6 mph shifting to the east late in
                    the morning.
Smoke dispersal.....Poor (1100 knot-ft) early in the morning
                    increasing to fair (17000 knot-ft) in the
                    afternoon.
GFDI................0.

TIME (CDT)      6 AM   8 AM   10 AM  NOON   2 PM   4 PM
Sky (%).........44     43     48     28     28     25
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............58     59     67     73     77     78
RH..............96     96     81     68     60     58
20 ft wind......S 2    S 1    S 2    SE 3   SE 3   E 3
20 ft wind gust.       2             6      6      6
Eye level wind..S 1    S 1    S 1    SE 2   SE 2   E 2
Eye lvl wnd gst.2      2      2      4      4      4
Surface wind....S 3    S 1    S 3    SE 4   SE 4   E 4
Surface wnd gst.       3             7      7      7
Mix hgt (ft)....300    300    1000   2300   3100   3900
Transport wind..S 6    S 5    S 3    E 5    E 6    E 5
GFDI............0      0      0      0      0      0
SDspl kt-ft/10001      1      3      11     17     16

.FORECAST DAYS 3 THROUGH 5...
.FRIDAY...
Partly cloudy. Lows in the upper 50s. Highs in the upper 70s.
Light winds.
.SATURDAY...
Mostly cloudy with slight chance of showers and thunderstorms.
Lows around 60. Highs in the mid 70s. Light winds.
.SUNDAY...
Mostly cloudy. Slight chance of showers and thunderstorms. Lows
in the upper 50s. Highs in the mid 70s. Light winds.

$$
Forecaster...Wood
Requested by...Jeff Seago
Type of request...PRESCRIBED
.TAG 2520815.0/OAX
.DELDT 08/27/25
.FormatterVersion 2.0.0
.EMAIL jeffrey.seago@dnr.iowa.gov