651  
FNUS76 KPDT 200000  
FWSPDT  
 
SPOT FORECAST FOR BIRCH CREEK FIRE...USFS  
NATIONAL WEATHER SERVICE PENDLETON OR  
500 PM PDT SAT SEP 19 2020  
 
FORECAST IS BASED ON FORECAST START TIME OF 1700 PDT ON SEPTEMBER 19.  
***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
 
UPPER RIDGE BUILDING INTO THE REGION TONIGHT AND SUNDAY  
WITH DRY WESTERLY FLOW.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY THEN BECOMING PARTLY CLOUDY. A  
SLIGHT CHANCE OF RAIN SHOWERS IN THE EVENING.  
CWR.................5 PERCENT.  
LAL.................1.  
MIN TEMPERATURE.....38-42.  
MAX HUMIDITY........82-87 PERCENT.  
WIND (20 FT)........WEST WINDS 5-10 MPH.  
RIDGETOP WIND.......WEST 10-15 MPH.  
MIXING HEIGHT.......2500 FT AGL IN THE EVENING THEN NEAR SURFACE.  
TRANSPORT WINDS.....WEST 5-10 MPH.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
SUNDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY SUNNY.  
CWR.................0 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....66-70.  
MIN HUMIDITY........32-37 PERCENT.  
WIND (20 FT)........NORTHWEST 5-10 MPH.  
RIDGETOP WIND.......WEST 10-15 MPH.  
MIXING HEIGHT.......NEAR SURFACE THEN 5400 FT AGL EARLY IN THE  
MORNING.  
TRANSPORT WINDS.....WEST 10-15 MPH.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
SUNDAY NIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR.  
CWR.................0 PERCENT.  
LAL.................1.  
MIN TEMPERATURE.....36-40.  
MAX HUMIDITY........62-67 PERCENT.  
WIND (20 FT)........NORTHWEST 3-6 MPH.  
RIDGETOP WIND.......SOUTHWEST 5-10 MPH.  
MIXING HEIGHT.......5000 FT AGL EARLY IN THE EVENING THEN NEAR  
SURFACE.  
TRANSPORT WINDS.....WEST 5-10 MPH.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
   
MONDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY.  
CWR.................0 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....68-72.  
MIN HUMIDITY........36-41 PERCENT.  
WIND (20 FT)........NORTHWEST 5-10 MPH.  
RIDGETOP WIND.......SOUTHWEST 10-15 MPH.  
MIXING HEIGHT.......NEAR SURFACE THEN 3900 FT AGL LATE IN THE  
MORNING.  
TRANSPORT WINDS.....WEST 10-15 MPH.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
 

 
FORECASTER...RC  
REQUESTED BY...KIP TURNER  
TYPE OF REQUEST...WILDFIRE  
.TAG 2012721.2/PDT  
.DELDT 09/19/20  
.FORMATTERVERSION 1.0.26  
.EMAIL SARAH.ANDERSEN@OREGON.GOV  
 
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