Text Products for FWS Issued by DMX

Spot Forecast
Issued by NWS Des Moines, IA
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13

000
FNUS73 KDMX 231409
FWSDMX

Spot Forecast for Yellow Banks Prescribed Fire - Tent Campground...Polk County Conservation Board
National Weather Service Des Moines IA
909 AM CDT Tue Apr 23 2024

Forecast is based on ignition time of 1000 CDT on April 23.
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...

Minor fire weather concerns today. Winds will start out of the
west southwest this morning, but will steadily trend to westerly
then northwesterly by this afternoon. Winds pick up as the
boundary layer mixes out around 10 to 11 am, with sustained winds
around 20 mph and gusts over 30 mph this afternoon. Conditions
will also be quite dry as humidities bottom out in the 20
percents. Fortunately, recent rains and warm conditions have
allowed for significant greening of fuels.

That being said, use caution when burning as winds pick up and
conditions dry out.

.REST OF TODAY...

Sky/weather.........Mostly cloudy (75-85 percent) then becoming
                    mostly sunny (20-30 percent).
Max temperature.....Around 70.
Min humidity........24 percent.
Wind (20 ft)........West winds 12 to 21 mph shifting to the
                    northwest 20 to 22 mph late in the afternoon.
Mixing height.......8500 ft AGL.
Transport winds.....West 18 to 23 mph shifting to the northwest 28
                    to 32 mph in the afternoon.
Smoke dispersal.....Fair (29000 knot-ft) early in the morning
                    increasing to excellent (67500 knot-ft) in the
                    afternoon increasing to excellent (157600
                    knot-ft) in the afternoon.
GFDI................1.
Haines Index........6 or high potential for large plume dominated
                    fire growth.

TIME (CDT)      10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........85  70  46  17  12  8   7   6
Weather cov.....
Weather type....
Tstm cov........
Temp............60  63  67  69  69  70  68  68
RH..............47  38  32  26  25  24  27  28
20 FT wind dir..W   W   W   NW  NW  NW  NW  NW
20 FT wind spd..12  15  17  21  22  22  22  20
20 FT wind gust.20  23  26  31  31  31  31  29
Mix hgt (kft)...1.8 3.4 6.6 8.0 8.5 8.2 8.0 7.5
Transp wind dir.W   W   NW  NW  NW  NW  NW  NW
Transp wind spd.18  23  28  31  32  31  31  30
GFDI............0   0   1   1   1   1   1   1
Haines index....6   6   6   6   6   6   6   6
SDspl kt-ft/100029  68  158 215 238 222 216 195

.TONIGHT...

Sky/weather.........Mostly clear (5-15 percent).
Min temperature.....Around 39.
Max humidity........82 percent.
Wind (20 ft)........Northwest winds 10 to 18 mph shifting to the
                    north 7 to 9 mph in the late evening and
                    overnight.
Mixing height.......500 ft AGL.
Transport winds.....Northwest 23 to 30 mph becoming north 12 to 17
                    mph early in the evening.
Smoke dispersal.....Excellent (194200 knot-ft) decreasing to
                    excellent (77700 knot-ft) early in the evening
                    decreasing to poor (5200 knot-ft) late in the
                    night.
GFDI................1.
Haines Index........4 to 6 or low to high potential for large plume
                    dominated fire growth.

TIME (CDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Sky (%).........9      6      2      3      9      18
Weather cov.....
Weather type....NONE   NONE   NONE   NONE   NONE   NONE
Tstm cov........
Temp............67     61     55     50     47     42
RH..............29     38     49     58     68     82
20 ft wind......NW 18  NW 13  NW 8   N 8    N 9    N 7
20 ft wind gust.26     20     16     15     15     13
Mix hgt (ft)....7500   600    500    500    500    500
Transport wind..NW 30  N 17   N 14   N 13   N 13   N 13
GFDI............1      0      0      0      0      0
Haines index....6      5      5      5      4      4
SDspl kt-ft/1000194    10     6      5      5      5

.WEDNESDAY...

Sky/weather.........Sunny (15-25 percent).
Max temperature.....Around 63.
Min humidity........30 percent.
Wind (20 ft)........Northeast winds around 7 mph shifting to the
                    east late in the afternoon.
Mixing height.......4800 ft AGL.
Transport winds.....Northeast 7 to 12 mph.
Smoke dispersal.....Poor (4700 knot-ft) early in the morning
                    increasing to fair (28800 knot-ft) in the
                    afternoon.
GFDI................0.
Haines Index........4 to 5 or low to moderate potential for large
                    plume dominated fire growth.

TIME (CDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........19        14        13        19
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
Temp............40        44        55        61
RH..............85        68        43        33
20 FT wind......N 7G12    NE 7G10   NE 7G10   E 7G9
Mix hgt (ft)....500       1700      3300      4500
Transport wind..N 10      NE 10     NE 7      NE 7
GFDI............0         0         0         0
Haines index....4         4         4         5
SDspl kt-ft/10005         16        21        29

$$
Forecaster...Dodson
Requested by...Douglas Todey
Type of request...PRESCRIBED
.TAG 2411957.0/DMX
.DELDT 04/23/24
.FormatterVersion 2.0.0
.EMAIL douglas.todey@polkcountyiowa.gov
National Weather Service Weather Forecast Office
