106  
FNUS75 KVEF 180116  
FWSVEF  
 
SPOT FORECAST FOR TWIN WEST RX UNIT...NATIONAL PARK SERVICE  
NATIONAL WEATHER SERVICE LAS VEGAS NV  
616 PM PDT MON SEP 17 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 1900 MST ON SEPTEMBER 17.  
 
IF CONDITIONS BECOME UNREPRESENTATIVE...OR IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST...PLEASE CONTACT OUR OFFICE AT  
(702) 263-9750.  
   
DISCUSSION
 
MOISTURE WILL TRY TO SNEAK TOWARD THE BURN AREA  
BEGINNING ON WEDNESDAY, BUT IS LIKELY TO REMAIN TO THE SOUTHEAST.  
A FEW CLOUD BUILDUPS WILL BE POSSIBLE, BUT RIGHT NOW THUNDERSTORM  
CHANCES ARE EXPECTED TO REMAIN VERY SMALL. DRY AIR IS LIKELY TO  
SWEEP BACK IN NEXT MONDAY OR TUESDAY.  
   
TUESDAY
 
 
SKY/WEATHER.........SUNNY.  
MAX TEMPERATURE.....83-88.  
MIN HUMIDITY........13-18 PERCENT.  
WINDS:  
20 FT WIND........SOUTH WINDS AROUND 5 MPH SHIFTING TO THE  
SOUTHWEST AROUND 10 MPH IN THE AFTERNOON.  
GUSTS UP TO 15 MPH.  
10000 FT WIND.....SOUTHWEST 33 TO 38 MPH DECREASING TO 28 TO 33  
MPH IN THE AFTERNOON.  
CWR (>= 0.10 IN)....0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......4000 FT AGL INCREASING TO 9000 FT AGL IN THE  
AFTERNOON.  
TRANSPORT WINDS.....SOUTHWEST 20 TO 25 KNOTS.  
HAINES INDEX........3.  
   
TUESDAY NIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR.  
MIN TEMPERATURE.....57-62.  
MAX HUMIDITY........36-41 PERCENT.  
WINDS:  
20 FT WIND........SOUTH WINDS AROUND 5 MPH.  
10000 FT WIND.....SOUTHWEST 22 TO 28 MPH.  
CWR (>= 0.10 IN)....0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......2000-3000 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 10 TO 15 KNOTS.  
HAINES INDEX........5.  
   
WEDNESDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY.  
MAX TEMPERATURE.....81-86.  
MIN HUMIDITY........18-23 PERCENT.  
WINDS:  
20 FT WIND........SOUTH WINDS AROUND 5 MPH SHIFTING TO THE  
SOUTHWEST AROUND 10 MPH IN THE AFTERNOON.  
GUSTS UP TO 15 MPH.  
10000 FT WIND.....SOUTHWEST 29 TO 34 MPH DECREASING TO 20 TO 25  
MPH IN THE AFTERNOON.  
CWR (>= 0.10 IN)....0 PERCENT.  
LAL.................1.  
MIXING HEIGHT.......3000 FT AGL INCREASING TO 9000 FT AGL IN THE  
AFTERNOON.  
TRANSPORT WINDS.....SOUTHWEST 15 TO 20 KNOTS.  
HAINES INDEX........3.  
 

 
FORECASTER...MORGAN  
REQUESTED BY...TIEGE DOWNES  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1815906.0/VEF  
.EMAIL TIEGE_DOWNES@NPS.GOV  
 
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