Suppression Forecast
Issued by NWS Des Moines, IA

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FNUS73 KDMX 071350
FWSDMX

Spot Forecast for Crystal Hills...Iowa Dept. of Natural Resources
National Weather Service Des Moines IA
850 AM CDT Fri May 7 2021

Forecast is based on ignition time of 1200 CDT on May 07.
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...

Fire weather conditions may be slightly elevated today with
seasonally low relative humidities and moderate winds. Skies
should become partly cloudy but it will remain dry with below
normal temperatures.

.REST OF TODAY...

Sky/weather.........Sunny (0-10 percent).
Max temperature.....Around 59.
Min humidity........26 percent.
Wind (20 ft)........North winds 13 to 15 mph.
Mixing height.......6300 ft AGL.
Transport winds.....North 16 to 20 mph.
Haines Index........5 or moderate potential for large plume
                    dominated fire growth.

TIME (CDT)      12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........3   4   4   3   3   3
Weather cov.....
Weather type....
Tstm cov........
Temp............54  56  57  58  59  58
RH..............34  29  28  27  26  27
20 FT wind dir..N   N   N   N   N   N
20 FT wind spd..14  15  14  14  13  13
20 FT wind gust.18  23  22  21  20  18
Mix hgt (kft)...5.3 5.5 6.1 6.3 6.3 6.1
Transp wind dir.N   N   N   N   N   N
Transp wind spd.20  18  18  17  16  16
Haines index....5   5   5   5   5   5

.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent). Areas of frost
                    after 3 am.
Min temperature.....Around 36.
Max humidity........70 percent.
Wind (20 ft)........North winds 6 to 12 mph shifting to the east 6
                    to 7 mph late in the evening.
Mixing height.......300 ft AGL.
Transport winds.....North 9 to 15 mph shifting to the east 6 to 10
                    mph in the late evening and overnight.
Haines Index........4 to 5 or low to moderate potential for large
                    plume dominated fire growth.

TIME (CDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Sky (%).........3      3      4      6      10     17
Weather cov.....                                   AREAS
Weather type....NONE   NONE   NONE   NONE   NONE   FROST
Tstm cov........
Temp............58     52     46     42     39     37
RH..............26     33     45     53     62     70
20 ft wind......N 12   N 8    NE 6   E 6    E 6    E 7
20 ft wind gust.17     15     10     9      12     13
Mix hgt (ft)....5900   1700   1300   400    300    400
Transport wind..N 15   N 9    NE 7   E 6    E 10   E 10
Haines index....5      5      5      4      4      4

.SATURDAY...

Sky/weather.........Partly sunny (50-60 percent). Slight chance of
                    rain showers early in the afternoon. Chance of
                    rain showers late in the afternoon.
Max temperature.....Around 55.
Min humidity........35 percent.
Wind (20 ft)........East winds 6 to 14 mph shifting to the
                    southeast 15 to 16 mph in the late morning and
                    afternoon.
Mixing height.......3800 ft AGL.
Transport winds.....Southeast 8 to 14 mph shifting to the east 18
                    to 22 mph in the late morning and afternoon.
Haines Index........3 to 4 or very low to low potential for large
                    plume dominated fire growth.

TIME (CDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........34        55        67        73
Weather cov.....                    S CHC     CHANCE
Weather type....NONE      NONE      RNSHWR    RNSHWR
Tstm cov........
Temp............36        46        54        55
RH..............72        53        38        37
20 FT wind......E 6G9     SE 14G18  SE 15G22  E 16G22
Mix hgt (ft)....400       1400      3800      3800
Transport wind..E 8       SE 18     SE 18     E 22
Haines index....4         3         4         3

$$
Forecaster...Small
Requested by...T.J. Herrick
Type of request...PRESCRIBED
.TAG 2111905.0/DMX
.DELDT 05/07/21
.FormatterVersion 2.0.0
.EMAIL tj.herrick@dnr.iowa.gov


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