313  
FNUS76 KOTX 180101  
FWSOTX  
 
SPOT FORECAST FOR COLD SPRING FIRE...COLVILLE BIA  
NATIONAL WEATHER SERVICE SPOKANE WA  
601 PM PDT THU SEP 17 2020  
 
FORECAST IS BASED ON FORECAST START TIME OF 1800 PDT ON SEPTEMBER 17.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
GRADUAL IMPROVEMENT IN THE SMOKE IS EXPECTED FRIDAY INTO SATURDAY  
WITH THE ARRIVAL OF A SLOW MOVING FRONTAL SYSTEM. LOOK FOR CHANCES  
FOR SHOWERS TO INCREASE FRIDAY NIGHT INTO SATURDAY. RAIN CHANCES  
WILL DIMINISH SATURDAY EVENING FOLLOWING THE PASSAGE OF THE FRONT.  
A WIND SHIFT FROM SOUTHWEST TO NORTHWEST WINDS ARE ALSO EXPECTED  
WITH THE PASSAGE OF THE FRONT LATE SATURDAY AFTERNOON. SUNDAY  
WILL LIKELY FEATURE DRY WEATHER, MOSTLY CLEAR SKIES, AND RELATIVELY  
LIGHT WINDS.  
 
   
FRIDAY
 
 
SKY/WEATHER.........SMOKY WITH THE POTENTIAL FOR SOME IMPROVEMENT  
IN THE AFTERNOON. SCATTERED HIGH CLOUDS IN THE  
MORNING WITH INCREASING HIGH CLOUDS IN THE  
AFTERNOON.  
CWR.................0 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....ELEVATION 900 FT: 84.  
ELEVATION 3300 FT: 75.  
MIN HUMIDITY........35-45 PERCENT.  
WIND (20 FT)........NORTH WINDS 3 TO 5 MPH IN THE MORNING SHIFTING  
TO THE SOUTH OR SOUTHEAST AROUND NOON AND  
INCREASING TO 6 TO 9 MPH WITH GUSTS TO  
AROUND 16 MPH AFTER 1400 PDT.  
MIXING HEIGHT.......AS HIGH AS 4500 FT AGL BETWEEN 1400 AND  
1800 PDT.  
TRANSPORT WINDS.....NORTHEAST 3 TO 5 MPH IN THE MORNING BECOMING  
SOUTHEAST 4 TO 8 MPH MID DAY AND INCREASING TO  
11 TO 16 MPH BY MID AFTERNOON.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
FRIDAY NIGHT
 
 
SKY/WEATHER.........GRADUAL DECREASE IN SMOKE THROUGH THE NIGHT.  
MOSTLY CLOUDY WITH A 40 PERCENT CHANCE OF  
SHOWERS.  
CWR.................10 PERCENT.  
LAL.................1.  
MIN TEMPERATURE.....56.  
MAX HUMIDITY........73 PERCENT.  
WIND (20 FT)........SOUTH WINDS 5 TO 8 MPH WITH EARLY EVENING  
GUSTS TO 14 MPH. SOUTH WIND DECREASING TO  
3 TO 6 MPH BY MID TO LATE EVENING.  
MIXING HEIGHT.......DECREASING TO NEAR SURFACE BY 2100 PDT.  
TRANSPORT WINDS.....SOUTH 10 TO 14 MPH EARLY IN THE EVENING  
DECREASING TO 4 TO 7 MPH BY MID TO LATE  
EVENING.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
   
SATURDAY
 
 
SKY/WEATHER.........CONTINUED IMPROVEMENT OF SMOKE. PARTLY  
SUNNY WITH A 40 PERCENT CHANCE OF SHOWERS  
THROUGH THE DAY.  
CWR.................15 PERCENT.  
LAL.................1.  
MAX TEMPERATURE.....ELEVATION 900 FT: 76.  
ELEVATION 3300 FT: 68.  
MIN HUMIDITY........32-42 PERCENT.  
WIND (20 FT)........SOUTH OR SOUTHWEST WINDS 3 TO 7 MPH IN THE  
MORNING INCREASING TO 6 TO 10 MPH WITH GUSTS  
TO 16 MPH IN THE AFTERNOON. WIND SHIFT TO TO  
WEST OR NORTHWEST 6 TO 10 MPH BETWEEN 1500  
AND 1700 PDT.  
MIXING HEIGHT.......AS HIGH AS 6500 FT AGL IN THE AFTERNOON.  
TRANSPORT WINDS.....SOUTH OR SOUTHWEST 6 TO 10 MPH IN THE MORNING  
BECOMING WEST OR NORTHWEST 12 TO 16 MPH  
BY LATE IN THE AFTERNOON.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
 

 
FORECASTER...GK  
REQUESTED BY...WALTER A SEIDEL  
TYPE OF REQUEST...WILDFIRE  
.TAG 2012257.12/OTX  
.DELDT 09/17/20  
.FORMATTERVERSION 1.0.26  
.EMAIL WSEIDEL@GMAIL.COM  
 
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