408  
FNUS75 KRIW 182113  
FWSRIW  
 
SPOT FORECAST FOR SHEEP CREEK...USFS SHF  
NATIONAL WEATHER SERVICE RIVERTON WY  
313 PM MDT MON OCT 18 2021  
 
FORECAST IS BASED ON FORECAST START TIME OF 1600 MDT ON OCTOBER 18.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 6 PM MDT  
TUESDAY...  
   
DISCUSSION
 
 
CLOUDY SKIES WILL CONTINUE THROUGH THE REST OF THE AFTERNOON, AS A  
STORM SYSTEM APPROACHES THE REGION. INCREASING CHANCES FOR  
PRECIPITATION THIS EVENING, WITH SNOW LIKELY AFTER MIDNIGHT. SNOW  
WILL CONTINUE THROUGH THE MORNING, WITH DECREASING CHANCES THROUGH  
TUESDAY AFTERNOON. SNOWFALL AMOUNTS OF 2 TO 4 INCHES EXPECTED.  
   
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
 
   
..HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT
 
 
FORECASTER...LAVOIE  
   
REST OF TODAY
 
 
SKY/WEATHER.........CLOUDY (75-85 PERCENT). ISOLATED RAIN SHOWERS.  
MAX TEMPERATURE.....50-53.  
MIN HUMIDITY........28-31 PERCENT.  
20-FOOT WINDS.......EAST-SOUTHEAST 10-20 MPH.  
RIDGE TOP WINDS.....SOUTHEAST AROUND 15 MPH.  
LAL.................1.  
CHC OF WETTING RAIN.ZERO PERCENT.  
HAINES INDEX........3.  
MIXING HEIGHT.......3800 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST AROUND 15 MPH.  
SMOKE DISPERSAL.....FAIR.  
 
TIME (MDT) 4PM 5PM  
SKY (%).........81 81  
WEATHER COV.....ISO ISO  
WEATHER TYPE....RW RS  
TSTM COV........  
CWR.............0 0  
LAL.............1 1  
TEMP............47 45  
RH..............43 45  
20 FT WIND DIR..SE SE  
20 FT WIND SPD..8 8  
20 FT WIND GUST.15 15  
MIX HGT (KFT)...3.8 3.8  
TRANSP WIND DIR.SE SE  
TRANSP WIND SPD.15 15  
HAINES INDEX....3 3  
SDSPL KT-FT/100049 49  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY (75-85 PERCENT). SCATTERED RAIN  
SHOWERS IN THE EVENING, THEN SNOW SHOWERS  
AFTER MIDNIGHT.  
MIN TEMPERATURE.....AROUND 30.  
MAX HUMIDITY........82-85 PERCENT.  
20-FOOT WINDS.......EAST WINDS AROUND 10 TO 15 MPH EARLY IN THE  
EVENING, THEN BECOMING NORTHEAST 8 TO 11 MPH  
LATE IN THE EVENING. GUSTS UP TO 20 MPH.  
RIDGE TOP WINDS.....NORTHEAST AROUND 15 MPH.  
LAL.................1.  
CHC OF WETTING RAIN.25 PERCENT INCREASING TO 73 PERCENT OVERNIGHT.  
HAINES INDEX........2 TO 3.  
MIXING HEIGHT.......1000 FT AGL.  
TRANSPORT WINDS.....NORTHEAST 14 TO 22 MPH INCREASING TO AROUND 24  
MPH AFTER 3 AM.  
SMOKE DISPERSAL.....POOR.  
 
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........85 85 85 77 77 77 67 67 67 91 91 91  
WEATHER COV..... SCT SCT NUM SCT SCT SCT SCT DEF DEF DEF DEF  
WEATHER TYPE.... RS SW SW SW SW SW SW SW SW SW SW  
TSTM COV........  
CWR.............30 30 30 30 30 30 70 70 70 70 70 70  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............41 40 38 36 36 35 34 33 32 31 31 30  
RH..............50 55 60 66 69 71 72 74 75 77 78 79  
20 FT WIND DIR..E E E NE NE NE NE NE NE NE NE NE  
20 FT WIND SPD..8 7 7 7 7 8 9 9 10 10 10 11  
20 FT WIND GUST.17 16 15 15 16 17 18 18 20 20 18 17  
MIX HGT (KFT)...1.0 1.0 1.0 0.9 0.9 0.9 0.9 0.9 0.9 1.0 1.0 1.0  
TRANSP WIND DIR.E E E NE NE NE NE NE NE NE NE NE  
TRANSP WIND SPD.14 14 14 20 20 20 22 22 22 24 24 24  
HAINES INDEX....3 3 3 3 3 3 2 2 2 2 2 2  
SDSPL KT-FT/100012 12 12 15 15 15 17 17 17 22 22 22  
   
TUESDAY
 
 
SKY/WEATHER.........CLOUDY (80-90 PERCENT). SNOW THROUGH THE  
MORNING, DECREASING IN THE AFTERNOON.  
MAX TEMPERATURE.....34-37.  
MIN HUMIDITY........79-82 PERCENT.  
20-FOOT WINDS.......NORTHEAST WINDS 10 TO 11 MPH.  
GUSTS UP TO 17 MPH.  
RIDGE TOP WINDS.....NORTHEAST AROUND 15 MPH.  
LAL.................1.  
CHC OF WETTING RAIN.91 PERCENT DECREASING TO 15 PERCENT IN THE  
AFTERNOON.  
HAINES INDEX........2.  
MIXING HEIGHT.......1500 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 23 MPH, THEN SHIFTING TO  
THE NORTHEAST 14 TO 16 MPH IN THE  
AFTERNOON.  
SMOKE DISPERSAL.....POOR.  
 
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........97 97 97 95 95 95 83 83 83 69 69 69  
WEATHER COV.....DEF DEF DEF DEF DEF DEF DEF LKY CHC CHC CHC CHC  
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN  
TSTM COV........  
CWR.............90 90 90 90 90 90 20 20 20 20 20 20  
LAL.............1 1 1 1 1 1 1 1 1 1 1 1  
TEMP............29 29 29 30 30 31 32 33 34 35 34 32  
RH..............80 81 83 84 83 82 80 77 74 73 76 82  
20 FT WIND DIR..NE NE NE NE NE N N N N N N N  
20 FT WIND SPD..11 10 8 8 8 9 9 9 8 8 7 6  
20 FT WIND GUST.17 16 16 16 16 17 17 17 17 16 15 14  
MIX HGT (KFT)...0.9 0.9 0.9 0.9 0.9 0.9 1.3 1.3 1.3 1.5 1.5 1.5  
TRANSP WIND DIR.NE NE NE S S S NE NE NE NE NE NE  
TRANSP WIND SPD.23 23 23 20 20 20 16 16 16 14 14 14  
HAINES INDEX....2 2 2 2 2 2 2 2 2 2 2 2  
SDSPL KT-FT/100019 19 19 15 15 15 18 18 18 17 17 17  
   
FORECAST DAYS 3 THROUGH 5
 
   
TUESDAY NIGHT
 
 
PARTLY CLOUDY. CHANCE OF SNOW IN THE EVENING. LOWS AROUND 20.  
WINDS GENERALLY LESS THAN 10 MPH.    
WEDNESDAY
 
 
PARTLY CLOUDY. LOWS IN THE UPPER 20S. HIGHS AROUND 40. WINDS  
GENERALLY LESS THAN 10 MPH.    
THURSDAY
 
 
PARTLY CLOUDY. LOWS IN THE UPPER 20S. HIGHS IN THE UPPER 30S.  
WEST WINDS AROUND 12 MPH.    
FRIDAY
 
 
PARTLY CLOUDY. LOWS AROUND 30. HIGHS IN THE MID 40S. WEST WINDS  
AROUND 10 MPH.  
 

 
FORECASTER...LAVOIE  
REQUESTED BY...LESLIE ZOLLINGER  
TYPE OF REQUEST...WILDFIRE  
.TAG 2119667.0/RIW  
.DELDT 10/18/21  
.EMAIL WYCDC@FIRENET.GOV  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab WY Page Main Text Page