042  
FNUS75 KGGW 121035  
FWSGGW  
 
SPOT FORECAST FOR TIN CAN HILL UNIT I...BLM LED  
NATIONAL WEATHER SERVICE GLASGOW MT  
435 AM MDT FRI MAY 12 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 0600 MDT ON MAY 12.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE AT (406) 228-4042.  
   
DISCUSSION
 
 
EXPECT GENERALLY HOT AND DRY CONDITIONS TODAY WITH MOSTLY CLEAR  
TO PARTLY CLOUDY SKIES OVER THE BURN AREA. SOUTH WINDS INCREASE  
THROUGH THE MORNING TO BLUSTERY CONDITIONS FOR THE AFTERNOON. A  
COLD FRONT MOVES OVER THE REGION TONIGHT, SHIFTING WINDS FROM  
SOUTH TO NORTHWEST, AND BRINGING GREATER CLOUD COVER AND COOLER,  
MORE MOIST CONDITIONS TO THE BURN AREA FOR TOMORROW.  
   
TODAY
 
 
SKY/WEATHER.........PARTLY CLOUDY (20-30 PERCENT) THEN BECOMING  
SUNNY (15-25 PERCENT).  
CWR.................0 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....83-88.  
MIN HUMIDITY........15-20 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 15 MPH. GUSTS UP TO 25 MPH IN  
THE AFTERNOON.  
MIXING HEIGHT.......100 FT AGL INCREASING TO 10800 FT AGL IN THE  
AFTERNOON.  
TRANSPORT WINDS.....SOUTH 15 MPH.  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT). ISOLATED SHOWERS  
AND THUNDERSTORMS IN THE EVENING, THEN ISOLATED  
SHOWERS AFTER MIDNIGHT.  
CWR.................0 PERCENT.  
LAL.................1-8 STRIKES.  
MIN TEMPERATURE.....47-52.  
MAX HUMIDITY........70-75 PERCENT.  
WIND (20 FT)........SOUTH WINDS 9 TO 17 MPH WITH GUSTS TO AROUND 30  
MPH BECOMING NORTHWEST 12 TO 22 MPH WITH GUSTS  
TO AROUND 40 MPH AFTER MIDNIGHT. GUSTY AND  
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS IN  
THE EVENING.  
MIXING HEIGHT.......10800 FT AGL DECREASING TO 2100 FT AGL AFTER  
MIDNIGHT.  
TRANSPORT WINDS.....SOUTHWEST 20 MPH.  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (45-55 PERCENT).  
CWR.................0 PERCENT.  
LAL.................NO TSTMS.  
MAX TEMPERATURE.....62-67.  
MIN HUMIDITY........27-32 PERCENT.  
WIND (20 FT)........NORTHWEST WINDS 5 TO 10 MPH. GUSTS UP TO 25 MPH  
IN THE MORNING.  
MIXING HEIGHT.......2100 FT AGL INCREASING TO 6500 FT AGL IN THE  
AFTERNOON.  
TRANSPORT WINDS.....NORTHWEST 15 MPH.  
 

 
FORECASTER...BIGELBACH  
REQUESTED BY...JAY MCALLISTER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1709035.4/GGW  
.EMAIL BLM_MT_LEC@BLM.GOV  
 
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