357  
FNUS75 KCYS 151257  
FWSCYS  
 
SPOT FORECAST FOR FIRE ACADEMY...NEMA  
NATIONAL WEATHER SERVICE CHEYENNE WY  
657 AM MDT MON SEP 15 2025  
 
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE AT (307) 772-2227  
   
DISCUSSION  
 
DRIER WEATHER EXPECTED TODAY WITH DAYTIME HUMIDITIES LOWERING TO AROUND  
20 PERCENT THIS AFTERNOON. MOISTURE WILL INCREASE LATE IN THE DAY,  
RESULTING IN A FEW SHOWERS AND THUNDERSTORMS LATE IN THE AFTERNOON  
AND THIS EVENING, MAINLY AFTER 400 PM. ANOTHER PACIFIC STORM SYSTEM  
WILL MOVE INTO THE AREA TUESDAY AND WEDNESDAY, BRINGING NUMEROUS  
RAIN SHOWERS AND SCATTERED THUNDERSTORMS TO WESTERN NEBRASKA THROUGH  
THURSDAY MORNING. MUCH COOLER TEMPERATURES ARE EXPECTED FOR MIDWEEK  
WITH IMPROVING DAYTIME HUMIDITIES.  
   
REST OF TODAY  
 
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT) EARLY, BECOMING PARTLY  
SUNNY LATE IN THE AFTERNOON. SLIGHT CHANCE OF  
SHOWERS AND THUNDERSTORMS LATE IN THE AFTERNOON.  
CWR.................5 PERCENT.  
MAX TEMPERATURE.....82 TO 87 DEGREES.  
MIN HUMIDITY........19 TO 24 PERCENT.  
WIND (20 FT)........SOUTHWEST WINDS 10 MPH SHIFTING TO THE  
SOUTH AROUND 10 TO 15 MPH LATE IN THE AFTERNOON.  
MIXING HEIGHT.......10300 FT AGL INCREASING TO 11400 FT AGL LATE IN  
THE AFTERNOON.  
TRANSPORT WINDS.....WEST 10 TO 16 MPH.  
SMOKE DISPERSAL.....POOR (5500 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO FAIR (50100 KNOT-FT) IN THE  
AFTERNOON INCREASING TO FAIR (52400 KNOT-FT)  
EARLY IN THE MORNING INCREASING TO VERY GOOD  
(144700 KNOT-FT) IN THE AFTERNOON IN THE  
AFTERNOON.  
 
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........12 12 3 3 3 15 15 15 48 48 48  
WEATHER COV..... SCH SCH SCH  
WEATHER TYPE.... RW RW RW  
TSTM COV........  
CWR.............0 0 0 0 0 10 10 10 10 10 10  
TEMP............53 57 63 72 77 82 83 84 85 82 81  
RH..............66 59 50 37 31 25 24 23 22 26 28  
20 FT WIND DIR..SW SW SW W W W SW SW SW S S  
20 FT WIND SPD..10 10 10 10 10 10 10 9 9 8 7  
20 FT WIND GUST.21 21 21 20 20 20 20 18 18 16 15  
MIX HGT (KFT)...0.5 0.5 0.8 1.8 3.9 9.3 10 11 11 11 5.8  
TRANSP WIND DIR.W W W W W W W W W SW W  
TRANSP WIND SPD.14 13 14 15 15 16 16 14 12 10 10  
SDSPL KT-FT/10006 6 9 24 50 130 145 136 113 95 52  
   
TONIGHT  
 
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF  
THUNDERSTORMS EARLY IN THE EVENING. SLIGHT  
CHANCE OF RAIN SHOWERS IN THE EVENING.  
CWR.................5 PERCENT.  
MIN TEMPERATURE.....AROUND 52.  
MAX HUMIDITY........90 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 10 MPH SHIFTING TO THE  
NORTHWEST AROUND 5 MPH EARLY IN THE MORNING.  
GUSTY AND ERRATIC WINDS EXPECTED NEAR  
THUNDERSTORMS EARLY IN THE EVENING.  
MIXING HEIGHT.......400 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 8 TO 12 MPH SHIFTING TO THE NORTH 10  
TO 12 MPH EARLY IN THE EVENING, THEN SHIFTING  
TO THE SOUTHEAST 8 TO 12 MPH LATE IN THE  
EVENING SHIFTING TO THE WEST AROUND 8 MPH  
OVERNIGHT SHIFTING TO THE NORTH SHIFTING TO THE  
NORTHWEST 8 TO 9 MPH AFTER 3 AM.  
SMOKE DISPERSAL.....POOR (2700 KNOT-FT).  
 
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........65 65 65 64 64 64 36 36 36 52 52 52  
WEATHER COV.....SCH SCH SCH SCH SCH SCH  
WEATHER TYPE....RW RW RW RW RW RW  
TSTM COV........SCH SCH SCH  
CWR.............10 10 10 10 10 10 0 0 0 0 0 0  
TEMP............78 71 67 65 62 61 60 58 57 56 55 54  
RH..............34 44 52 56 62 65 64 69 69 72 74 77  
20 FT WIND DIR..S S S S SW SW SW SW W W W NW  
20 FT WIND SPD..7 7 6 6 5 5 5 5 5 5 6 6  
20 FT WIND GUST.13 12 10 10 9 9 9 9 9 9 10 12  
MIX HGT (KFT)...0.5 0.4 0.5 0.5 0.5 0.4 0.4 0.4 0.4 0.4 0.4 0.4  
TRANSP WIND DIR.SE E N NE SE E W NE N NW NW N  
TRANSP WIND SPD.8 12 10 12 12 8 8 8 8 9 8 9  
SDSPL KT-FT/10004 4 4 5 5 3 3 3 3 3 3 3  
   
TUESDAY  
 
SKY/WEATHER.........PARTLY SUNNY (55-65 PERCENT). SLIGHT CHANCE OF  
RAIN SHOWERS AND THUNDERSTORMS LATE IN THE  
AFTERNOON.  
CWR.................5 PERCENT.  
MAX TEMPERATURE.....AROUND 75.  
MIN HUMIDITY........40 TO 55 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 8 MPH SHIFTING TO THE  
NORTHEAST AROUND 10 TO 15 MPH IN THE AFTERNOON.  
GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS  
LATE IN THE AFTERNOON.  
MIXING HEIGHT.......4400 FT AGL.  
TRANSPORT WINDS.....NORTH 9 TO 14 MPH.  
SMOKE DISPERSAL.....POOR (2500 KNOT-FT) EARLY IN THE MORNING  
INCREASING TO FAIR (41900 KNOT-FT) IN THE  
AFTERNOON.  
 
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........61 61 61 52 52 52 63 63 63 55 55 55  
WEATHER COV.....SCH SCH SCH SCH SCH SCH CHC CHC CHC CHC CHC CHC  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW  
TSTM COV........ SCH SCH SCH  
CWR.............10 10 10 10 10 10 10 10 10 10 10 10  
TEMP............54 52 54 58 63 66 70 71 73 74 73 72  
RH..............80 89 90 83 70 63 57 55 51 50 51 53  
20 FT WIND DIR..NW NW NW NW NW N N N NE NE NE NE  
20 FT WIND SPD..5 6 7 7 8 8 8 8 8 8 8 8  
20 FT WIND GUST.12 13 14 15 16 17 17 17 17 16 16 16  
MIX HGT (KFT)...0.3 0.3 0.4 0.6 1.3 2.0 2.7 3.5 4.1 4.4 4.0 3.3  
TRANSP WIND DIR.N N N N N N N N NE NE NE NE  
TRANSP WIND SPD.10 9 13 12 10 12 14 14 12 10 10 10  
SDSPL KT-FT/10003 3 5 6 12 20 32 42 42 40 36 29  
 
 
REQUESTED BY...MEGAN ECKLES  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2521976.0/CYS  
.DELDT 09/15/25  
.FORMATTERVERSION 2.0.0  
.EMAIL MEGAN.ECKLES@NEBRASKA.GOV  
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