146
FNUS73 KDMX 221315
FWSDMX

Spot Forecast for Diamond Lake Middle Prairie...Poweshiek County Conservation Board
National Weather Service Des Moines IA
815 AM CDT Wed Jul 22 2026

Forecast is based on ignition time of 0800 CDT on July 22.
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...

Highs in the mid 70s are expected today with RH dropping to 50% by
afternoon. Winds will be light from the NNW around 5-10 mph. It
will be partly cloudy most of the day and rain is unlikely.

.REST OF TODAY...

Sky/weather.........Mostly sunny (40-50 percent).
Temperature.........63 at ignition...Max 77.
RH..................81 percent at ignition...Min 50 percent.
Wind (20 ft)........Winds northeast at 6 mph at
                    ignition...otherwise North winds 5 to 8 mph.
Mixing height.......900 ft AGL at ignition...otherwise 5100 ft AGL.
Transport winds.....Northeast 7 to 8 mph shifting to the north 10
                    to 12 mph late in the morning.
Smoke dispersal.....Poor /6500 knot-ft/ at ignition. Max...fair
                    /50900 knot-ft/.
GFDI................0.

TIME (CDT)      8 AM         NOON         4 PM
Sky (%).........21           49           64
Weather cov.....
Weather type....NONE         NONE         NONE
Tstm cov........
Temp............63           72           76
RH..............81           59           50
20 FT wind......NE 6G9       N 7G9        N 5G12
Mix hgt (ft)....900          4900         4900
Transport wind..NE 8         N 12         N 12
GFDI............0            0            0
Smoke Dispersal.7            49           49
Smoke Cat.......POOR         FAIR         FAIR

.TONIGHT...

Sky/weather.........Mostly clear (20-30 percent).
Temperature.........Min 54.
RH..................Max 86 percent.
Wind (20 ft)........North winds around 5 mph early in the evening
                    becoming light.
Mixing height.......400 ft AGL.
Transport winds.....North 7 to 10 mph shifting to the east 5 to 7
                    mph in the late evening and overnight.
Smoke dispersal.....Fair (41600 knot-ft) early in the evening
                    decreasing to poor (1700 knot-ft) late in the
                    night.
GFDI................0.

TIME (CDT)      6 PM         10 PM        2 AM
Sky (%).........42           6            4
Weather cov.....
Weather type....NONE         NONE         NONE
Tstm cov........
Temp............76           64           59
RH..............50           73           80
20 FT wind......N 5G9        E 2G5        E 1G3
Mix hgt (ft)....4600         400          400
Transport wind..N 10         E 6          E 6
GFDI............0            0            0
Smoke Dispersal.42           2            2
Smoke Cat.......FAIR         POOR         POOR

.THURSDAY...

Sky/weather.........Mostly sunny (35-45 percent) then becoming
                    mostly cloudy (75-85 percent).
Temperature.........Max 80.
RH..................Min 45 percent.
Wind (20 ft)........Light winds.
Mixing height.......5200 ft AGL.
Transport winds.....Southeast 5 to 8 mph shifting to the south
                    around 8 mph late in the afternoon.
Smoke dispersal.....Poor (1600 knot-ft).
GFDI................0.

TIME (CDT)      6 AM         10 AM        2 PM
Sky (%).........25           49           50
Weather cov.....
Weather type....NONE         NONE         NONE
Tstm cov........
Temp............55           70           78
RH..............90           61           47
20 FT wind......E 1G3        SE 2G7       SE 3G9
Mix hgt (ft)....400          2500         5000
Transport wind..E 5          SE 8         SE 7
GFDI............0            0            0
Smoke Dispersal.2            18           30
Smoke Cat.......POOR         POOR         POOR

$$
Forecaster...De Bruin
Requested by...Cole Rozendaal
Type of request...PRESCRIBED
.TAG 2617945.0/DMX
.DELDT 07/22/26
.FormatterVersion 2.0.0
.EMAIL crozen@poweshiekcountyiowa.gov