708  
FNUS76 KPDT 182352  
FWSPDT  
 
SPOT FORECAST FOR BIRCH CREEK FIRE...USFS  
NATIONAL WEATHER SERVICE PENDLETON OR  
452 PM PDT FRI SEP 18 2020  
 
FORECAST IS BASED ON FORECAST START TIME OF 0000 PDT ON SEPTEMBER 18.  
***THUNDERSTORMS IMPLY GUSTY AND ERRATIC WINDS***  
***WINDS ARE 20 FOOT 10-MINUTE AVERAGES***  
***CWR-CHANCE OF WETTING RAIN 0.10 OR GREATER***  
 
IF YOU HAVE QUESTIONS OR CONCERNS WITH THIS FORECAST, PLEASE  
CONTACT OUR OFFICE AT (541) 276-8134.  
   
DISCUSSION
 
LOW PRESSURE SYSTEM MOVING ACROSS THE REGION TODAY  
AND TONIGHT WITH SHOWERS AND INCREASING WINDS.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. RAIN  
SHOWERS LIKELY AND A SLIGHT CHANCE OF  
THUNDERSTORMS IN THE EVENING, THEN A CHANCE OF  
RAIN SHOWERS OVERNIGHT.  
CWR.................30 PERCENT.  
LAL.................2.  
MIN TEMPERATURE.....44-48.  
MAX HUMIDITY........80-85 PERCENT.  
WIND (20 FT)........SOUTHWEST 10-15 MPH.  
RIDGETOP WIND.......SOUTHWEST 12-20 MPH.  
MIXING HEIGHT.......1000 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 10-20 MPH.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY. A  
SLIGHT CHANCE OF RAIN SHOWERS.  
CWR.................10 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....60-64.  
MIN HUMIDITY........53-58 PERCENT.  
WIND (20 FT)........WEST 10-15 MPH.  
RIDGETOP WIND.......WEST 12-20 MPH.  
MIXING HEIGHT.......4700 FT AGL.  
TRANSPORT WINDS.....WEST 10-20 MPH.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
SATURDAY NIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR.  
CWR.................0 PERCENT.  
LAL.................1.  
MIN TEMPERATURE.....40-44.  
MAX HUMIDITY........85-90 PERCENT.  
WIND (20 FT)........WEST 10-15 MPH.  
RIDGETOP WIND.......WEST 12-20 MPH.  
MIXING HEIGHT.......500 FT AGL IN THE EVENING THEN NEAR SURFACE.  
TRANSPORT WINDS.....WEST 10-20 MPH.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
SUNDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY.  
CWR.................0 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....63-68.  
MIN HUMIDITY........37-42 PERCENT.  
WIND (20 FT)........SOUTHWEST 5-10 MPH.  
RIDGETOP WIND.......SOUTHWEST 10-15 MPH.  
MIXING HEIGHT.......5500 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 10-15 MPH.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 

 
FORECASTER...RC  
REQUESTED BY...KIP TURNER  
TYPE OF REQUEST...WILDFIRE  
.TAG 2012721.1/PDT  
.DELDT 09/18/20  
.FORMATTERVERSION 1.0.26  
.EMAIL SARAH.ANDERSEN@OREGON.GOV  
 
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