506
FNUS75 KCYS 010033
FWSCYS
SPOT FORECAST FOR CANYON FIRE...HARRISON NEBRASKA FIRE
NATIONAL WEATHER SERVICE CHEYENNE WY
633 PM MDT SUN MAY 31 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE AT (307) 772-2227
DISCUSSION
NORTHWESTERLY TO NORTHERLY WINDS AT 10 TO 15 MPH EXPECTED THROUGH 11PM
TONIGHT BEFORE DECREASING TO VARIABLE AT 3 TO 5 MPH THROUGH 9AM MONDAY
MORNING. WINDS TURN EASTERLY BY 9AM AROUND 5 TO 10 MPH BEFORE SWITCHING
TO SOUTHEASTERLY FROM NOON THROUGH THE AFTERNOON AND EVENING HOURS. WINDS
INCREASE FROM 10 TO 15 MPH AT NOON TO 15 TO 20 MPH BY 4PM AND CONTINUING
THROUGH THE OVERNIGHT HOURS. ISOLATED TO SCATTERED SHOWERS AND STORMS ARE
EXPECTED MONDAY AFTERNOON, BETWEEN NOON AND 9PM. STRONGEST STORMS WILL
PRODUCE LARGE HAIL AND GUSTY, ERRATIC, AND DAMAGING WINDS BETWEEN 4PM AND
9PM. AFTERNOON HUMIDITY VALUES WILL DROP TO AROUND 35 TO 40 PERCENT, BEFORE
INCREASING BEHIND AND SHOWER OR STORM THAT MOVES THROUGH THE REGION. THE
OVERNIGHT HUMIDITY RECOVERIES WILL BE GOOD, BETWEEN 75 AND 80 PERCENT.
REST OF TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT).
CWR.................1 PERCENT.
MIN TEMPERATURE.....AROUND 49.
MAX HUMIDITY........80 PERCENT.
WIND (20 FT)........NORTH WINDS 5 TO 12 MPH IN THE EVENING AND
OVERNIGHT BECOMING LIGHT, THEN BECOMING
NORTHEAST AROUND 5 MPH EARLY IN THE MORNING.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....NORTH 8 TO 14 MPH SHIFTING TO THE SOUTHEAST 7
TO 8 MPH AFTER 3 AM.
SMOKE DISPERSAL.....POOR (3300 KNOT-FT).
HAINES INDEX........MISSING.
TIME (MDT) 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........19 19 13 13 13 18 18 18 45 45 45
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0
TEMP............65 62 59 58 56 54 54 52 51 50 50
RH..............37 46 55 60 66 71 71 77 80 80 80
20 FT WIND DIR..NW NW N N N N N N N NE NE
20 FT WIND SPD..12 10 9 7 7 6 5 5 3 3 5
20 FT WIND GUST.22 20 17 15 13 10 9 8 8 8 8
MIX HGT (KFT)...2.8 1.0 0.6 0.5 0.5 0.5 0.5 0.6 0.7 0.7 0.6
TRANSP WIND DIR.N N N N NW N NW N NE SE SE
TRANSP WIND SPD.14 12 12 10 9 9 8 8 8 8 7
HAINES INDEX....M M M M M M M M M M M
SDSPL KT-FT/100033 10 6 5 4 4 3 4 5 5 4
MONDAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT). CHANCE OF SHOWERS
AND THUNDERSTORMS LATE IN THE AFTERNOON.
CWR.................0 PERCENT INCREASING TO 13 PERCENT IN THE
AFTERNOON.
MAX TEMPERATURE.....AROUND 75.
MIN HUMIDITY........35 PERCENT.
WIND (20 FT)........NORTHEAST WINDS 5 TO 7 MPH SHIFTING TO THE
SOUTHEAST 7 TO 16 MPH WITH GUSTS TO AROUND 31
MPH IN THE LATE MORNING AND AFTERNOON. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
LATE IN THE AFTERNOON.
MIXING HEIGHT.......8000 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 8 TO 17 MPH SHIFTING TO THE SOUTH
AROUND 21 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (6200 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (98500 KNOT-FT) IN THE
AFTERNOON INCREASING TO GOOD (68600 KNOT-FT)
EARLY IN THE MORNING INCREASING TO VERY GOOD
(120700 KNOT-FT) IN THE AFTERNOON LATE IN THE
AFTERNOON.
HAINES INDEX........MISSING.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........57 57 57 39 39 39 26 26 26 52 52 52
WEATHER COV..... CHC CHC CHC
WEATHER TYPE.... RW RW RW
TSTM COV........ CHC CHC CHC
CWR.............0 0 0 0 0 0 10 10 10 10 10 10
TEMP............50 53 54 57 61 65 69 71 72 74 72 71
RH..............80 71 69 62 53 46 40 38 38 35 38 39
20 FT WIND DIR..NE NE E E E SE SE SE SE SE SE SE
20 FT WIND SPD..5 5 6 7 7 8 9 12 12 14 15 16
20 FT WIND GUST.9 10 12 13 14 16 18 21 24 26 29 31
MIX HGT (KFT)...0.8 1.2 1.4 2.0 2.6 3.5 4.2 5.6 7.0 8.0 6.6 3.8
TRANSP WIND DIR.SE S SE S S SE SE S S S S S
TRANSP WIND SPD.9 8 8 9 10 12 13 14 16 17 21 21
HAINES INDEX....M M M M M M M M M M M M
SDSPL KT-FT/10006 8 10 16 23 35 47 68 99 121 119 69
MONDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT). CHANCE OF
SHOWERS AND THUNDERSTORMS EARLY IN THE EVENING,
THEN SLIGHT CHANCE OF RAIN SHOWERS LATE IN THE
EVENING.
CWR.................7 PERCENT.
MIN TEMPERATURE.....AROUND 54.
MAX HUMIDITY........72 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 13 TO 16 MPH WITH GUSTS TO
AROUND 32 MPH. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS EARLY IN THE EVENING.
MIXING HEIGHT.......600 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 17 TO 26 MPH SHIFTING TO THE SOUTH 21
TO 28 MPH AFTER 3 AM.
SMOKE DISPERSAL.....POOR (9900 KNOT-FT).
HAINES INDEX........MISSING.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........41 41 41 36 36 36 29 29 29 41 41 41
WEATHER COV.....CHC CHC CHC SCH SCH SCH
WEATHER TYPE....RW RW RW RW RW RW
TSTM COV........CHC CHC CHC
CWR.............10 10 10 10 10 10 0 0 0 0 0 0
TEMP............70 67 64 61 61 60 60 60 58 58 58 55
RH..............41 47 50 56 53 55 55 55 60 62 62 72
20 FT WIND DIR..SE SE SE SE SE SE SE SE S S S S
20 FT WIND SPD..16 16 16 16 16 16 15 14 14 13 13 13
20 FT WIND GUST.32 32 32 32 31 30 29 28 26 25 25 24
MIX HGT (KFT)...2.3 1.5 1.3 0.7 0.7 0.7 0.7 0.7 0.7 0.9 0.7 0.6
TRANSP WIND DIR.S SE SE SE SE SE SE S S S S S
TRANSP WIND SPD.18 17 17 17 18 20 21 18 26 28 21 21
HAINES INDEX....M M M M M M M M M M M M
SDSPL KT-FT/100037 23 19 10 11 12 13 11 20 21 13 11
FORECASTER...MOSE
REQUESTED BY...HARRISON NEBRASKA FIRE
TYPE OF REQUEST...WILDFIRE
.TAG 2614729.0/CYS
.DELDT 05/31/26
.FORMATTERVERSION 2.0.0
.EMAIL SLIM_KATE@YAHOO.COM
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