359
FNUS73 KBIS 261837
FWSBIS

Spot Forecast for Hb 29 30 31...Usfws
National Weather Service Bismarck ND
137 PM CDT Sat Apr 26 2025

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

.DISCUSSION...

A partly cloudy sky is expected to be found over the prescribed
burn area at the time of ignition, becoming mostly cloudy through
the afternoon. High temperatures Sunday afternoon are forecast in
the upper 60s around the burn site, with minimum relative humidity
to drop down to as low 49 percent. Cloud cover will continue to
increase overnight into Monday, accompanied by chances for rain as
a low pressure system cuts across South Dakota. Light southeast
winds will turn easterly through the day Sunday, before becoming
gusty out of the north overnight into Monday morning.

Chances for rain will diminish Monday morning as skies clear from
west to east. Overall rain totals around the burn site are
expected to be less than 0.1", with a chance of wetting rain
around 25%, mainly before midnight Monday morning. High
temperatures on Monday are forecast to be in the lower 50s, while
minimum relative humidities drop to as low as 40 percent.
Northerly winds will become gusty Monday as a low level jet sets
up over northwest and north central North Dakota, with sustained
speeds broadly from 13 to 23 MPH and gusts up to around 31 MPH,
before diminishing through the evening.

.SUNDAY...

Sky/weather.........Partly to mostly cloudy.
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...2 percent.
Max temperature.....Around 69.
Min humidity........49 percent.
Wind (20 ft)........Southeast winds 5 to 10 mph becoming
                    east winds through the day.
Mixing height.......3700 ft AGL.
Transport winds.....Southeast around 8 mph shifting to the east 8
                    to 9 mph late in the afternoon.
Smoke dispersal.....Poor (16300 knot-ft).

TIME (CDT)      12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........37  45  46  46  47  54
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0
Chc of pcpn (%).0   10  10  10  10  10
Chc of thdr (%).0   0   0   0   0   0
Temp............58  61  63  65  66  67
RH..............67  60  56  52  50  49
20 FT wind dir..SE  SE  SE  E   E   E
20 FT wind spd..6   6   6   7   8   9
20 FT wind gust.12  12  12  12  12  13
Mix hgt (kft)...2.3 2.8 3.1 3.4 3.7 3.4
Transp wind dir.SE  SE  E   E   NE  E
Transp wind spd.8   8   8   8   8   9
Dispr kt-ft/1K..16  19  21  23  26  27

.SUNDAY NIGHT...

Sky/weather.........Mostly cloudy. Chance of rain showers.
CWR.................9 percent.
Chance of pcpn......40 percent.
Chance of thunder...10 percent.
Min temperature.....Around 39.
Max humidity........96 percent.
Wind (20 ft)........Northeast winds 10 to 15 mph with gusts to
                    around 25 mph shifting to north winds overnight.
Mixing height.......800 ft AGL.
Transport winds.....Northeast 10 to 17 mph shifting to the north 20
                    to 22 mph after 3 am.
Smoke dispersal.....Poor (9800 knot-ft).

TIME (CDT)      6 PM   8 PM   10 PM  MIDNGT 2 AM   4 AM
Sky (%).........60     71     79     84     88     89
Weather cov.....       CHANCE CHANCE CHANCE CHANCE CHANCE
Weather type....NONE   RNSHWR RNSHWR RNSHWR RNSHWR RNSHWR
Tstm cov........
CWR.............0      0      0      0      10     10
Chc of pcpn (%).10     40     40     40     40     40
Chc of thdr (%).0      10     10     10     0      0
Temp............67     63     55     52     50     48
RH..............50     58     80     86     89     93
20 ft wind......E 9    E 9    NE 10  NE 10  NE 12  N 15
20 ft wind gust.14     15     17     17     19     23
Mix hgt (ft)....3100   2200   900    800    900    1100
Transport wind..E 10   E 13   NE 14  NE 14  NE 16  N 20
Dispr kt-ft/1K..28     24     10     10     12     18

.MONDAY...

Sky/weather.........Mostly cloudy through the day, becoming mostly
                    clear through the late evening and overnight.
                    Slight chance of rain showers in the morning.
CWR.................9 percent.
Chance of pcpn......40 percent.
Chance of thunder...4 percent.
Max temperature.....Around 51.
Min humidity........44 percent.
Wind (20 ft)........North winds 16 to 23 mph with gusts to around
                    31 mph.
Mixing height.......4600 ft AGL.
Transport winds.....North 23 to 29 mph.
Smoke dispersal.....Poor (27400 knot-ft) early in the morning
                    increasing to good (99600 knot-ft) in the
                    afternoon.

TIME (CDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........90        88        85        69
Weather cov.....CHANCE    CHANCE    CHANCE    S CHC
Weather type....RNSHWR    RNSHWR    RNSHWR    RNSHWR
Tstm cov........
CWR.............10        10        10        0
Chc of pcpn (%).40        30        30        20
Chc of thdr (%).0         0         0         0
Temp............44        42        43        47
RH..............96        89        76        56
20 FT wind......N 16G26   N 21G31   N 23G31   N 23G31
Mix hgt (ft)....1300      1900      2700      4000
Transport wind..NE 23     N 29      N 28      N 25
Dispr kt-ft/1K..27        48        65        90

$$
Forecaster...ADAM
Requested by...Calvin
Type of request...PRESCRIBED
.TAG 2511865.0/BIS
.DELDT 04/26/25
.FormatterVersion 2.0.0
.EMAIL calvin_moldenhauer@fws.gov