290
FNUS73 KBIS 281826
FWSBIS
SPOT FORECAST FOR 21-1...WASHBURN VFD
NATIONAL WEATHER SERVICE BISMARCK ND
126 PM CDT TUE APR 28 2026
FORECAST IS BASED ON IGNITION TIME OF 1600 CDT ON APRIL 28.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
THE MINIMUM RELATIVE HUMIDITY IS FORECAST TO DROP DOWN AROUND 29
PERCENT WITH A HIGH TEMPERATURE IN THE LOWER 50S THIS AFTERNOON.
WINDS ARE OUT OF THE NORTHWEST AROUND 8 MPH WITH GUSTS AROUND 14 MPH.
WINDS ARE FORECAST TO VEER OUT OF THE NORTHEAST TONIGHT AROUND 5 MPH.
HOWEVER, WINDS WILL BACK OUT OF THE NORTHEAST TO THE NORTH BY TOMORROW
AROUND 10 MPH WITH GUSTS UP TO 17 MPH BY THE AFTERNOON. MINIMUM RELATIVE
HUMIDITY IS FORECAST TO DROP DOWN AROUND 33 PERCENT WITH HIGH
TEMPERATURES IN THE LOWER 50S.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 51.
MIN HUMIDITY........29 PERCENT.
WIND (20 FT)........NORTHWEST WINDS AROUND 8 MPH.
MIXING HEIGHT.......8000 FT AGL.
TRANSPORT WINDS.....NORTHWEST 14 TO 15 MPH.
SMOKE DISPERSAL.....GOOD (96400 KNOT-FT).
TIME (CDT) 4PM 5PM
SKY (%).........42 44
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0
CHC OF PCPN (%).0 0
CHC OF THDR (%).0 0
TEMP............50 50
RH..............31 29
20 FT WIND DIR..NW NW
20 FT WIND SPD..8 8
20 FT WIND GUST.14 14
MIX HGT (KFT)...7.7 8.0
TRANSP WIND DIR.NW NW
TRANSP WIND SPD.15 14
DISPR KT-FT/1K..100 96
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY THEN
BECOMING MOSTLY CLOUDY THEN BECOMING PARTLY
CLOUDY.
CWR.................1 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 29.
MAX HUMIDITY........69 PERCENT.
WIND (20 FT)........NORTHEAST WINDS 3 TO 8 MPH IN THE EVENING
BECOMING LIGHT.
MIXING HEIGHT.......200 FT AGL.
TRANSPORT WINDS.....NORTHWEST 6 TO 15 MPH SHIFTING TO THE EAST 5 TO
6 MPH LATE IN THE EVENING, THEN SHIFTING TO THE
SOUTHEAST AROUND 6 MPH OVERNIGHT SHIFTING TO
THE SOUTH AFTER 3 AM SHIFTING TO THE EAST
AROUND 5 MPH.
SMOKE DISPERSAL.....VERY GOOD (105400 KNOT-FT) EARLY IN THE EVENING
DECREASING TO FAIR (40700 KNOT-FT) LATE IN THE
NIGHT DECREASING TO POOR (700 KNOT-FT) IN THE
LATE EVENING AND OVERNIGHT.
TIME (CDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........53 27 30 22 20 23 31 43 43 52 48 50
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............50 49 47 41 39 37 36 35 33 32 31 30
RH..............29 29 31 41 44 48 50 52 56 61 63 66
20 FT WIND DIR..NW NW NW N N NE E NE E E NE N
20 FT WIND SPD..8 9 7 5 5 4 3 3 3 3 3 4
20 FT WIND GUST.14 13 11 9 7 6 6 6 6 6 6 6
MIX HGT (KFT)...8.1 7.4 4.1 0.6 0.5 0.3 0.3 0.3 0.3 0.3 0.2 0.2
TRANSP WIND DIR.NW NW NW NW N NE E E E SE S E
TRANSP WIND SPD.15 14 12 7 6 5 5 6 6 6 6 5
DISPR KT-FT/1K..105 89 41 4 3 1 1 1 1 1 1 1
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................2 PERCENT.
CHANCE OF PCPN......10 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 53.
MIN HUMIDITY........33 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING NORTH 10 TO 11 MPH.
MIXING HEIGHT.......7700 FT AGL.
TRANSPORT WINDS.....NORTHEAST 5 TO 8 MPH SHIFTING TO THE NORTH 10
TO 16 MPH LATE IN THE MORNING.
SMOKE DISPERSAL.....POOR (700 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (98300 KNOT-FT) IN THE
AFTERNOON INCREASING TO VERY GOOD (108000
KNOT-FT) LATE IN THE AFTERNOON.
TIME (CDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........52 52 55 42 35 36 37 37 47 47 44 42
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 10
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............30 29 32 37 42 44 46 49 50 51 51 51
RH..............66 69 63 56 48 45 43 39 37 34 34 33
20 FT WIND DIR..N NE NE NE NE NE N N N N N N
20 FT WIND SPD..4 4 5 5 6 7 8 9 9 10 10 11
20 FT WIND GUST.7 8 8 9 10 12 13 14 14 15 17 18
MIX HGT (KFT)...0.2 0.2 0.3 0.9 2.2 3.6 5.1 6.2 7.0 7.0 7.6 7.7
TRANSP WIND DIR.NE E NE NE N N N N NW NW N N
TRANSP WIND SPD.5 5 6 7 8 10 10 12 10 12 15 16
DISPR KT-FT/1K..1 1 2 6 15 33 46 62 63 70 98 108
FORECASTER...JOHNSON
REQUESTED BY...CHRIS GORDON
TYPE OF REQUEST...PRESCRIBED
.TAG 2611962.0/BIS
.DELDT 04/28/26
.FORMATTERVERSION 2.0.0
.EMAIL CHRIS_GORDON@TNC.ORG
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