192  
FNUS75 KRIW 190823  
FWSRIW  
 
SPOT FORECAST FOR GILBERT MEADOW...U.S. FOREST SERVICE  
NATIONAL WEATHER SERVICE RIVERTON WY  
223 AM MDT FRI OCT 19 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0700 MDT ON OCTOBER 19.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
CLEAR AND DRY THROUGH SATURDAY WITH LIGHT, MAINLY TERRAIN DRIVEN  
WINDS. LIGHT WINDS IN THE MIXED LAYER WILL KEEP SMOKE DISPERSAL  
POOR THROUGH SATURDAY.  
   
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
 
   
..HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT
 
 
FORECASTER...SKRBAC  
   
TODAY
 
 
SKY/WEATHER.........SUNNY (0-5 PERCENT).  
MAX TEMPERATURE.....49-52.  
MIN HUMIDITY........24-27 PERCENT.  
20-FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH.  
RIDGE TOP WINDS.....WEST AROUND 10 MPH.  
LAL.................1.  
CHC OF WETTING RAIN.ZERO PERCENT.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......300-500 FT AGL UNTIL 1000,THEN GRADUALLY  
INCREASING TO 3200 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 8 MPH.  
SMOKE DISPERSAL.....POOR.  
   
TONIGHT
 
 
SKY/WEATHER.........CLEAR (0-5 PERCENT).  
MIN TEMPERATURE.....24-27.  
MAX HUMIDITY........80-86 PERCENT.  
20-FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH.  
RIDGE TOP WINDS.....SOUTHEAST AROUND 10 MPH.  
LAL.................1.  
CHC OF WETTING RAIN.ZERO PERCENT.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......200 FT AGL.  
TRANSPORT WINDS.....EAST AROUND 11 MPH.  
SMOKE DISPERSAL.....POOR.  
   
SATURDAY
 
 
SKY/WEATHER.........SUNNY (0-5 PERCENT).  
MAX TEMPERATURE.....52-55.  
MIN HUMIDITY........22-25 PERCENT.  
20-FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH.  
RIDGE TOP WINDS.....SOUTHEAST AROUND 10 MPH.  
LAL.................1.  
CHC OF WETTING RAIN.ZERO PERCENT.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......300-600 FT AGL UNTIL 1200, THEN INCREASING  
TO 5000 FT AGL BY 1600L.  
TRANSPORT WINDS.....SOUTHEAST AROUND 6 MPH.  
SMOKE DISPERSAL.....POOR.  
   
FORECAST DAYS 3 THROUGH 5
 
   
SATURDAY NIGHT
 
 
CLEAR. LOWS IN THE LOWER 30S. WINDS GENERALLY LESS THAN 10 MPH.    
SUNDAY
 
 
PARTLY CLOUDY. CHANCE OF RAIN. LOWS IN THE LOWER 30S. HIGHS IN  
THE LOWER 50S. AFTERNOON SOUTHWEST WIND 10 TO 15 MPH. SMOKE  
DISPERSAL BECOMING FAIR TO GOOD IN THE AFTERNOON.    
MONDAY
 
 
MOSTLY CLOUDY WITH CHANCE OF SHOWERS, SLIGHT CHANCE OF  
THUNDERSTORMS AND SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS  
AROUND 50. WINDS GENERALLY LESS THAN 10 MPH.    
TUESDAY
 
 
PARTLY CLOUDY WITH CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS IN  
THE UPPER 20S. HIGHS IN THE UPPER 40S. WINDS GENERALLY LESS THAN  
10 MPH.  
 

 
FORECASTER...SKRBAC  
REQUESTED BY...MAGGIE  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1817093.0/RIW  
.DELDT 10/19/18  
.EMAIL MAGGIEDALENE@FS.FED.US  
 
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