264
FNUS75 KCYS 291743
FWSCYS
SPOT FORECAST FOR SAWMILL FIRE...CASPER INTERAGENCY DISPATCH CENTER
NATIONAL WEATHER SERVICE CHEYENNE WY
1143 AM MDT WED JUL 29 2026
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE AT (307) 772-2227
DISCUSSION
A SHORT WAVE IS EXPECTED TO INITIATE SCATTERED THUNDERSTORMS THIS AFTERNOON.
THERE IS A POP-UP SHOWER DIRECTLY OVERHEAD THE SAWMILL FIRE, ERRATIC WIND GUSTS
UNDERNEATH THESE SHOWERS AS WELL AS LOCALLY HEAVY RAINFALL. THE MID TO UPPER
LEVEL SHEAR IS REALLY BELOW SEVERE THRESHOLD SO THE GREATEST THREAT APPEARS TO
BE THE LOCALIZED HEAVY RAINFALL AND POTENTIAL WIND GUSTS BETWEEN 55 TO 65MPH.
THE MIN RH FOR THE SAWMILL AREA IS EXPECTED TO FALL BETWEEN 25 AND 35 PERCENT
OVER THE NEXT FEW DAYS WITH OVERNIGHT RECOVERIES AROUND 70 PERCENT. ALSO WITH
THE WEAK SHEAR ALOFT, TRANSPORT WINDS WILL BE MARGINAL DURING THE DAY AND POOR
OVERNIGHT, AS THE NOCTURNAL INVERSION SETS UP TO LIMIT SMOKE DISPERSAL AS WELL.
TOMORROW AND THROUGH THE WEEKEND THE CENTRAL PRESSURE OF THE UPPER LEVEL RIDGE
WILL MEANDER WESTWARD TEMPORARILY DECREASING THE CWR TO LESS THAN 10 PERCENT
AFTER THURSDAY AFTERNOON.
REST OF TODAY
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). PATCHY SMOKE
THROUGH THE DAY. CHANCE OF SHOWERS AND
THUNDERSTORMS EARLY IN THE AFTERNOON. SLIGHT
CHANCE OF SHOWERS AND THUNDERSTORMS LATE IN THE
AFTERNOON.
CWR.................25 PERCENT.
MAX TEMPERATURE.....AROUND 83.
MIN HUMIDITY........31 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS AROUND 7 MPH. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS EARLY IN THE
AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS LATE IN THE AFTERNOON.
MIXING HEIGHT.......8100 FT AGL.
TRANSPORT WINDS.....SOUTH 9 TO 15 MPH.
SMOKE DISPERSAL.....FAIR (59500 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (77100 KNOT-FT) IN THE
AFTERNOON.
TIME (MDT) 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........75 75 75 66 66 66
WEATHER COV.....CHC CHC CHC SCH SCH SCH
WEATHER TYPE....RW RW RW RW RW RW
TSTM COV........CHC CHC CHC SCH SCH SCH
CWR.............30 30 30 30 30 30
TEMP............83 83 82 82 82 81
RH..............33 32 32 32 31 33
20 FT WIND DIR..E SE SE SE SE SE
20 FT WIND SPD..7 7 7 7 7 7
20 FT WIND GUST.14 14 14 14 14 14
MIX HGT (KFT)...7.4 8.1 7.0 7.0 7.6 5.9
TRANSP WIND DIR.S S S S S S
TRANSP WIND SPD.9 9 10 12 12 15
SDSPL KT-FT/100060 65 63 70 76 77
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT). PATCHY SMOKE IN
THE EVENING. PATCHY SMOKE EARLY IN THE MORNING.
CHANCE OF THUNDERSTORMS LATE IN THE EVENING.
CHANCE OF SHOWERS IN THE LATE EVENING AND
OVERNIGHT.
CWR.................7 PERCENT.
MIN TEMPERATURE.....AROUND 67.
MAX HUMIDITY........59 PERCENT.
WIND (20 FT)........SOUTH WINDS 7 TO 10 MPH SHIFTING TO THE WEST 7
TO 9 MPH LATE IN THE EVENING. GUSTY AND ERRATIC
WINDS EXPECTED NEAR THUNDERSTORMS LATE IN THE
EVENING.
MIXING HEIGHT.......500 FT AGL.
TRANSPORT WINDS.....SOUTH 12 TO 14 MPH SHIFTING TO THE WEST 10 TO
14 MPH LATE IN THE EVENING.
SMOKE DISPERSAL.....GOOD (71100 KNOT-FT) EARLY IN THE EVENING
DECREASING TO POOR (4500 KNOT-FT) LATE IN THE
NIGHT.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........76 76 76 79 79 79 56 56 56 61 61 61
WEATHER COV.....PTY PTY PTY CHC CHC CHC CHC CHC CHC PTY
WEATHER TYPE....SMK SMK SMK RW RW RW RW RW RW SMK
TSTM COV........ CHC CHC CHC
CWR.............10 10 10 10 10 10 10 10 10 10 10 10
TEMP............81 78 76 74 73 71 70 69 69 69 68 67
RH..............34 39 43 48 49 53 55 57 57 57 59 59
20 FT WIND DIR..S S S S SW W W W W W W W
20 FT WIND SPD..7 8 9 10 9 9 8 7 7 7 7 7
20 FT WIND GUST.15 16 17 18 18 16 15 14 13 12 12 12
MIX HGT (KFT)...5.9 3.3 0.7 0.5 1.0 0.8 0.6 0.6 0.6 0.7 0.6 0.5
TRANSP WIND DIR.S S S S SW W W W W W W W
TRANSP WIND SPD.14 13 12 13 13 14 13 13 12 12 12 10
SDSPL KT-FT/100071 36 7 6 11 9 7 7 6 7 6 5
THURSDAY
SKY/WEATHER.........SUNNY (20-30 PERCENT). PATCHY SMOKE EARLY IN
THE MORNING. PATCHY SMOKE LATE IN THE MORNING.
CWR.................1 PERCENT.
MAX TEMPERATURE.....AROUND 84.
MIN HUMIDITY........24 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 7 TO 12 MPH SHIFTING TO THE
NORTH AROUND 13 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......9900 FT AGL INCREASING TO 10900 FT AGL LATE IN
THE AFTERNOON.
TRANSPORT WINDS.....WEST 12 TO 21 MPH.
SMOKE DISPERSAL.....POOR (5300 KNOT-FT) EARLY IN THE MORNING
INCREASING TO VERY GOOD (104500 KNOT-FT) IN THE
AFTERNOON INCREASING TO VERY GOOD (115100
KNOT-FT) EARLY IN THE MORNING INCREASING TO
EXCELLENT (185100 KNOT-FT) IN THE AFTERNOON IN
THE AFTERNOON.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........44 44 44 6 6 6 12 12 12 35 35 35
WEATHER COV.....PTY PTY PTY PTY PTY PTY PTY PTY PTY PTY PTY
WEATHER TYPE....SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
TEMP............67 69 71 73 75 78 81 82 83 84 83 82
RH..............59 55 51 48 43 38 32 28 25 24 24 26
20 FT WIND DIR..W W W W W NW NW NW NW NW N N
20 FT WIND SPD..7 8 9 12 12 12 12 12 12 12 13 13
20 FT WIND GUST.14 15 18 21 22 23 23 23 23 23 23 24
MIX HGT (KFT)...0.5 0.5 1.7 2.6 4.6 6.5 8.5 9.9 11 11 9.3 7.7
TRANSP WIND DIR.W W W W W W W W W NW NW NW
TRANSP WIND SPD.12 13 15 16 17 18 20 21 20 20 20 17
SDSPL KT-FT/10005 6 22 37 69 105 144 178 180 185 159 115
FORECASTER...MCLAUGHLIN
REQUESTED BY...THEODORE DONOGHUE
TYPE OF REQUEST...WILDFIRE
.TAG 2618593.0/CYS
.DELDT 07/29/26
.FORMATTERVERSION 2.0.0
.EMAIL WYCPC@FIRENET.GOV,JBISIAR@BLM.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page