National Weather Service Text Product
AFOS product FWSBIS
Dates interpreted at 00:00 UTCDisplaying AFOS PIL: FWSBIS
Product Timestamp: 2025-09-25 14:05 UTC
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623
FNUS73 KBIS 251405
FWSBIS
Spot Forecast for Big Top Mesa...USDA Forest Service
National Weather Service Bismarck ND
905 AM CDT Thu Sep 25 2025
Forecast is based on ignition time of 0800 MDT on September 25.
If conditions become unrepresentative, contact the National Weather
Service.
.DISCUSSION...
High pressure over southern Saskatchewan this morning will drift slowly
east today. Northeast winds 5 to 7 mph this morning will shift to the
east 5 to 10 mph this afternoon, then to the southeast 5 to 10 mph by
late afternoon or early evening. Max gusts through the day should remain
at or below 15 mph. It will be sunny with a high around 80 degrees.
Afternoon humidity will drop to around 30 percent. Mixing height at max
heating is expected to be around 3400 feet AGL, with poor smoke
dispersion. Southeast winds will remain elevated 10-15 mph
tonight and into Friday morning. A cold front will move through the
areas Friday morning with winds shifting from southerly to northwest
between mid-morning and early afternoon. By Friday afternoon expect
northwest winds of 15 to 25 mph with some higher gusts to 35 mph possible.
.REST OF TODAY...
Sky/weather.........Sunny.
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 79.
Min humidity........30 percent.
Wind (20 ft)........Northeast winds 5 to 7 mph shifting to the east
7 to 8 mph late in the afternoon.
Mixing height.......3400 ft AGL.
Transport winds.....East 8 to 15 mph shifting to the southeast 8 to
9 mph late in the afternoon.
Smoke dispersal.....Poor (6800 knot-ft).
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM
Sky (%).........0 0 0 0 0 1 1 1 1
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0
Temp............51 57 62 67 71 74 76 78 78
RH..............77 64 54 45 39 35 33 32 31
20 FT wind dir..NE NE NE NE E E E E E
20 FT wind spd..5 6 7 7 7 7 7 8 8
20 FT wind gust.10 11 12 13 13 13 14 14 14
Mix hgt (kft)...0.7 1.3 1.6 2.1 2.5 2.8 3.2 3.4 3.4
Transp wind dir.NE NE E E E E E E SE
Transp wind spd.12 15 14 12 9 8 8 8 9
Dispr kt-ft/1K..7 17 19 21 20 20 22 24 27
.TONIGHT...
Sky/weather.........Clear.
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 55.
Max humidity........83 percent.
Wind (20 ft)........Southeast winds 9 to 10 mph. Gusts up to 21 mph
overnight.
Mixing height.......600 ft AGL.
Transport winds.....Southeast 12 to 20 mph shifting to the south
around 20 mph after 3 am.
Smoke dispersal.....Poor (7200 knot-ft).
TIME (MDT) 5PM 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM
Sky (%).........2 2 3 4 4 4 4 4 4 4 3 3
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............78 76 73 68 65 62 60 59 58 57 56 56
RH..............32 36 41 49 52 62 67 72 75 77 83 80
20 FT wind dir..SE SE SE SE SE SE SE SE SE S S S
20 FT wind spd..9 9 9 9 9 9 9 10 9 9 9 9
20 FT wind gust.14 14 14 14 14 15 15 17 17 17 18 17
Mix hgt (kft)...3.0 1.2 0.7 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6
Transp wind dir.E E E SE SE SE SE SE S S S S
Transp wind spd.12 13 13 16 18 18 20 20 20 20 20 20
Dispr kt-ft/1K..30 13 7 9 10 10 11 10 10 10 11 10
.FRIDAY...
Sky/weather.........Sunny.
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 81.
Min humidity........27 percent.
Wind (20 ft)........South winds 9 to 11 mph shifting to the
northwest 14 to 16 mph with gusts to around 24
mph in the afternoon.
Mixing height.......4800 ft AGL.
Transport winds.....South 20 to 23 mph shifting to the west 18 to
26 mph late in the morning, then shifting to
the northwest 25 to 29 mph late in the
afternoon.
Smoke dispersal.....Poor (11300 knot-ft) early in the morning
increasing to good (97900 knot-ft) in the
afternoon increasing to very good (102600
knot-ft) late in the afternoon.
TIME (MDT) 5AM 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM
Sky (%).........4 4 3 3 2 8 11 14 15 14 12 10
Weather cov.....
Weather type....
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 0 0
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............56 55 57 60 64 71 74 77 79 80 79 78
RH..............77 80 72 64 56 42 35 31 28 27 28 29
20 FT wind dir..S S S S SW SW W NW NW NW NW NW
20 FT wind spd..9 9 10 10 11 12 14 15 16 16 16 15
20 FT wind gust.15 14 14 14 17 19 20 22 22 24 24 22
Mix hgt (kft)...0.6 0.7 0.8 0.9 1.3 2.2 2.9 3.4 4.1 4.6 4.8 4.7
Transp wind dir.S S S S SW W W NW NW NW NW NW
Transp wind spd.21 21 20 20 23 18 24 26 28 29 28 25
Dispr kt-ft/1K..11 12 13 16 26 35 60 79 98 115 115 103
$$
Forecaster...HAMILTON
Requested by...Lee Nelson
Type of request...PRESCRIBED
.TAG 2522518.0/BIS
.DELDT 09/25/25
.FormatterVersion 2.0.0
.EMAIL lee.nelson@usda.gov