586  
FNUS75 KRIW 221125  
FWSRIW  
 
SPOT FORECAST FOR NOON POINT RX...BLM  
NATIONAL WEATHER SERVICE RIVERTON WY  
525 AM MDT SUN APR 22 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON APRIL 22.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
SURFACE HIGH PRESSURE TO THE NORTHEAST AND LOW  
PRESSURE INTENSIFYING OVER THE WESTERN GREAT BASIN WILL BRING A  
LOW LEVEL EAST SOUTHEAST FLOW ACROSS THE AREA IN THE LATE MORNING  
AND AFTERNOON. A COLD FRONT WILL BRING SHOWERS AND ISOLATED  
THUNDERSTORMS WEST OF THE DIVIDE SUNDAY NIGHT, WITH THE COLD FRONT  
MOVING THROUGH THE BURN AREA AROUND SUNRISE MONDAY MORNING. GUSTY  
NORTH WIND AND SNOW SHOWERS WILL ACCOMPANY THE FRONT WITH A FEW  
INCHES OF WET SNOW POSSIBLE. HIGH PRESSURE WILL BRING DRY AND  
WARMER WEATHER, LIGHT WIND ON TUESDAY.  
   
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
 
   
..HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT
 
 
FORECASTER...MEUNIER  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY SUNNY (10-20 PERCENT). BECOMING PARTLY CLOUDY  
(30-40 PERCENT)AFTER 1500.  
MAX TEMPERATURE.....60-63.  
MIN HUMIDITY........22-25 PERCENT.  
20-FOOT WINDS.......SOUTHEAST 5-9 MPH IN THE MORNING. EAST AROUND  
10 MPH WITH GUSTS 15 TO 20 MPH IN THE AFTERNOON.  
RIDGE TOP WINDS.....SOUTHWEST AROUND 10 MPH SHIFTING TO THE EAST IN THE  
LATE MORNING AND AFTERNOON.  
LAL.................NO TSTMS.  
CHC OF WETTING RAIN.ZERO PERCENT.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......1800 FT AGL UNTIL 1200, THEN 9100 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 13 TO 17 MPH.  
SMOKE DISPERSAL.....POOR UNTIL 0900, INCREASING TO EXCELLENT IN THE AFTERNOON.  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (55-65 PERCENT) THEN BECOMING  
CLOUDY (85-95 PERCENT). ISOLATED RAIN SHOWERS  
AFTER MIDNIGHT.  
MIN TEMPERATURE.....32-34.  
MAX HUMIDITY........86-89 PERCENT.  
20-FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 4-7 MPH AFTER SUNSET BECOMING  
NORTH 5 TO 10 MPH IN THE EARLY MORNING.  
RIDGE TOP WINDS.....EAST AROUND 10 MPH SHIFTING TO THE SOUTH AFTER  
MIDNIGHT.  
LAL.................NO TSTMS.  
CHC OF WETTING RAIN.LESS THAN 5 PERCENT.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......4100 FT AGL UNTIL 2400, THEN 500 FT AGL.  
TRANSPORT WINDS.....SOUTH AROUND 10 MPH.  
SMOKE DISPERSAL.....GOOD UNTIL SUNSET, THEN BECOMING POOR.  
   
MONDAY
 
 
SKY/WEATHER.........CLOUDY (95-100 PERCENT). NUMEROUS SNOW SHOWERS.  
MAX TEMPERATURE.....32-35.  
MIN HUMIDITY........66-69 PERCENT.  
20-FOOT WINDS.......NORTH WINDS 11 TO 16 MPH. GUSTS UP TO 25 MPH  
INCREASING TO 30 MPH LATE IN THE AFTERNOON.  
RIDGE TOP WINDS.....NORTH 15 TO 20 MPH INCREASING TO AROUND 25 MPH  
LATE IN THE AFTERNOON.  
LAL.................NO TSTMS.  
CHC OF WETTING RAIN.79 PERCENT.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......2000-3000 FT AGL.  
TRANSPORT WINDS.....NORTH 21 TO 26 MPH.  
SMOKE DISPERSAL.....GOOD TO EXCELLENT.  
   
FORECAST DAYS 3 THROUGH 5
 
 
   
MONDAY NIGHT
 
 
CLOUDY WITH SCATTERED SNOW SHOWERS. LOWS IN THE LOWER 20S. NORTH  
WINDS AROUND 10 MPH.  
   
TUESDAY
 
 
MOSTLY CLEAR. LOWS IN THE LOWER 20S. HIGHS IN THE LOWER 40S.  
WINDS GENERALLY LESS THAN 10 MPH.  
   
WEDNESDAY
 
 
WARMER. PARTLY CLOUDY. CHANCE OF SNOW SHOWERS AND SHOWERS. LOWS  
IN THE UPPER 20S. HIGHS IN THE MID 50S. WINDS GENERALLY LESS THAN  
10 MPH.  
   
THURSDAY
 
 
MOSTLY CLEAR WITH SLIGHT CHANCE OF SHOWERS AND SNOW SHOWERS. LOWS  
IN THE UPPER 20S. HIGHS IN THE LOWER 50S. WINDS GENERALLY LESS  
THAN 10 MPH.  
 

 
FORECASTER...MEUNIER  
REQUESTED BY...SAGE DECKER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1806109.4/RIW  
.EMAIL JSDECKER@BLM.GOV  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab WY Page Main Text Page