322
FNUS75 KCYS 241119
FWSCYS
SPOT FORECAST FOR SOUTH FORK FIRE...USWFS
NATIONAL WEATHER SERVICE CHEYENNE WY
519 AM MDT WED JUN 24 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE AT (307) 772-2227
DISCUSSION
FIRE WEATHER CONCERNS ARE MINIMAL OVER THE NEXT FEW
DAYS WITH HIGH HUMIDITIES, FLASH FLOODING CONCERNS, AND NUMEROUS
THUNDERSTORMS MOVING OVER THE BURN AREA THROUGH THURSDAY. BURN
SCAR FLOODING IS THE PRIMARY CONCERN IF ENOUGH HEAVY RAIN FALLS IN
A SHORT PERIOD OF TIME WITH TONIGHT AND THURSDAY LOOKING LIKE THE
MOST FAVORABLE PERIOD OF TIME TO SEE HEAVY RAINFALL.
TODAY
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). ISOLATED RAIN
SHOWERS IN THE MORNING, THEN SCATTERED RAIN
SHOWERS AND THUNDERSTORMS LATE IN THE AFTERNOON.
CWR.................10 TO 15 PERCENT.
MAX TEMPERATURE.....73 TO 78 DEGREES.
MIN HUMIDITY........40 TO 55 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING EAST 5 TO 12 MPH. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
LATE IN THE AFTERNOON.
MIXING HEIGHT.......5000 FT AGL.
TRANSPORT WINDS.....EAST 6 TO 8 MPH INCREASING TO 7 TO 14 MPH LATE
IN THE MORNING.
SMOKE DISPERSAL.....FAIR (59700 KNOT-FT) IN THE AFTERNOON.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........77 77 77 76 75 74 69 69 69 69 69 69
WEATHER COV.....ISO ISO ISO ISO ISO ISO SCT SCT SCT SCT SCT SCT
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........ SCT SCT SCT
CWR.............10 10 10 10 10 10 10 10 10 10 10 10
TEMP............54 56 59 63 66 68 70 72 73 75 74 73
RH..............88 83 74 67 61 58 54 53 51 48 50 55
20 FT WIND DIR..E E E E E E E E E E E E
20 FT WIND SPD..2 5 6 7 7 8 8 8 8 8 9 12
20 FT WIND GUST.6 8 10 13 15 16 16 16 16 16 18 22
MIX HGT (KFT)...0.4 0.9 1.4 2.1 2.6 3.3 3.9 4.2 4.9 5.0 4.7 4.1
TRANSP WIND DIR.NE E E E E SE SE SE SE SE E E
TRANSP WIND SPD.6 7 8 8 7 7 9 9 10 10 12 14
HAINES INDEX....M M M M M M M M M M M M
SDSPL KT-FT/10002 7 11 16 19 26 33 36 47 52 53 60
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). SCATTERED
SHOWERS AND THUNDERSTORMS IN THE EVENING, THEN
NUMEROUS RAIN SHOWERS AND ISOLATED
THUNDERSTORMS OVERNIGHT. PATCHY FOG EARLY IN
THE MORNING.
CWR.................50 PERCENT.
MIN TEMPERATURE.....50 TO 55 DEGREES.
MAX HUMIDITY........90 TO 98 PERCENT.
WIND (20 FT)........EAST WINDS 5 TO 12 MPH IN THE EVENING AND
OVERNIGHT BECOMING LIGHT. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....EAST 8 TO 16 MPH.
SMOKE DISPERSAL.....POOR (4400 KNOT-FT).
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........86 86 86 86 86 86 77 77 77 89 89 89
WEATHER COV.....SCT SCT SCT SCT SCT SCT SCT SCT SCT NUM NUM NUM
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........SCT SCT SCT ISO ISO ISO ISO ISO ISO ISO ISO ISO
CWR.............40 40 40 40 40 40 50 50 50 50 50 50
TEMP............71 69 66 64 63 61 60 59 59 57 56 55
RH..............59 59 67 70 72 76 76 77 81 85 89 93
20 FT WIND DIR..E E E E E E E E E E E E
20 FT WIND SPD..12 12 12 10 8 7 6 5 5 3 3 3
20 FT WIND GUST.24 23 22 20 16 13 10 9 8 8 7 7
MIX HGT (KFT)...2.3 2.5 1.0 0.7 0.5 0.5 0.7 0.7 0.8 0.8 0.8 0.7
TRANSP WIND DIR.E E E E E E E E SE E E E
TRANSP WIND SPD.16 16 14 13 9 10 10 9 9 9 9 8
HAINES INDEX....M M M M M M M M M M M M
SDSPL KT-FT/100037 38 16 13 7 6 10 10 8 7 7 7
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY (80-90 PERCENT). PATCHY FOG EARLY
IN THE MORNING. ISOLATED THUNDERSTORMS EARLY IN
THE MORNING, THEN NUMEROUS RAIN SHOWERS AND
SCATTERED THUNDERSTORMS IN THE AFTERNOON.
CWR.................75 PERCENT DECREASING TO 55 PERCENT IN THE
AFTERNOON.
MAX TEMPERATURE.....65 TO 70 DEGREES.
MIN HUMIDITY........55 TO 65 PERCENT.
WIND (20 FT)........LIGHT WINDS BECOMING EAST 5 TO 12 MPH, THEN
SHIFTING TO THE SOUTHEAST AROUND 12 MPH LATE IN
THE AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS.
MIXING HEIGHT.......3200 FT AGL.
TRANSPORT WINDS.....EAST 8 TO 15 MPH SHIFTING TO THE SOUTHEAST 17
TO 20 MPH IN THE AFTERNOON.
SMOKE DISPERSAL.....POOR (4300 KNOT-FT) EARLY IN THE MORNING
INCREASING TO FAIR (58500 KNOT-FT) IN THE
AFTERNOON.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........94 94 94 95 95 95 93 93 93 73 73 73
WEATHER COV.....DEF DEF DEF DEF DEF DEF NUM NUM NUM NUM NUM NUM
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........ISO ISO ISO SCT SCT SCT SCT SCT SCT
CWR.............80 80 80 80 80 80 60 60 60 60 60 60
TEMP............54 56 57 59 61 63 64 66 68 69 69 68
RH..............95 95 91 85 80 76 71 68 65 62 64 68
20 FT WIND DIR..E E E E E E E E SE SE SE SE
20 FT WIND SPD..3 5 5 6 7 7 7 9 12 12 12 12
20 FT WIND GUST.7 8 9 10 12 13 15 17 21 23 23 23
MIX HGT (KFT)...0.6 1.0 1.2 1.3 1.6 1.7 1.8 2.0 2.7 2.7 3.2 2.9
TRANSP WIND DIR.E E E E E E SE SE SE SE SE SE
TRANSP WIND SPD.8 10 12 12 13 14 15 20 17 18 20 18
HAINES INDEX....M M M M M M M M M M M M
SDSPL KT-FT/10006 12 13 14 18 21 28 38 49 52 59 52
REQUESTED BY...MIKE DAVIN
TYPE OF REQUEST...WILDFIRE
.TAG 2616059.0/CYS
.DELDT 06/24/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL_DAVIN@FIRENET.GOV
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