724  
FXUS66 KOTX 230000  
AFDOTX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SPOKANE WA  
500 PM PDT FRI SEP 22 2017  
   
SYNOPSIS
 
 
A DRYING AND WARMING TREND IS EXPECTED FOR THE INLAND NORTHWEST  
THROUGH NEXT WEEK. HIGH TEMPERATURES THROUGH THE WEEKEND WILL  
STILL BE BELOW NORMAL WITH HIGHS MAINLY IN THE 60S WITH THE  
WARMEST SPOTS NEAR 70. BY THE END OF NEXT WEEK, LOOK FOR  
TEMPERATURES TO SURGE WELL INTO THE 70S.  
 

 
   
DISCUSSION
 
 
TONIGHT THROUGH SUNDAY NIGHT...AN UPPER LEVEL TROUGH LOCATED JUST  
SOUTH AND EAST OF THE AREA TODAY ACROSS CENTRAL AND SOUTHERN IDAHO  
INTO WESTERN MONTANA WILL SLOWLY PULL EAST THROUGH THE WEEKEND AND  
BE REPLACED BY A FLAT RIDGE OF HIGH PRESSURE. THIS WILL LEAD TO A  
GRADUAL WARMING TREND INTO THE WEEKEND WITH A FEW LINGERING  
MOUNTAIN SHOWERS INTO SATURDAY. SUNDAY AFTERNOON AND EVENING A  
WEAK WAVE TRACKS THROUGH THE AREA BRINGING A BAND OF MID AND HIGH  
LEVEL CLOUDS WITH A SLIGHT CHANCE OF SHOWERS OVER THE NORTH  
CASCADES. THE LOWER LEVEL AIR MASS OVER NE WASHINGTON AND N IDAHO  
HAS DRIED OUT THIS AFTERNOON WITH DEW POINTS FALLING INTO THE  
30S. THIS SHOULD LIMIT FOG POTENTIAL TONIGHT WITH MUCH LESS  
COVERAGE COMPARED TO WHAT WAS OBSERVED THIS MORNING. JW  
 
MONDAY THROUGH FRIDAY...  
BY MONDAY AFTERNOON, THE DEEP TROF WILL HAVE MOVED OFF TO OUR  
EAST ALONG THE FRONT RANGE TO THE FOUR CORNER REGION. AN EQUALLY  
HIGH AMPLITUDE RIDGE WILL BE CENTERED OVER THE WESTERN US COAST  
WITH A WEAK DISTURBANCE ROTATING AROUND IT'S NORTHERN PERIPHERY.  
THIS WEAK WAVE WILL LIKELY BRING SOME INCREASED CLOUD COVERAGE AND  
A FEW LIGHT SHOWERS TO THE MOUNTAINS MONDAY AFTERNOON/EVENING.  
AFTER THAT WAVE DEPARTS, THE RIDGE SHIFTS TOWARDS THE COAST AND  
EVENTUALLY INLAND BY MIDWEEK BRINGING BACK TEMPERATURES AT OR  
ABOVE NORMAL ALONG WITH CLEAR SKIES. THE RIDGE LOOKS TO HOLD  
STRONG THROUGH THE END OF THE WORKWEEK. THERE ARE SOME INDICATIONS  
THAT IT MAY LAST THROUGH THE WEEKEND BUT MODELS DIVERGE GREATLY  
ON THE NEXT TROF SKIRTING THE REGION.  
 
ADJUSTMENTS TO THE FORECAST INCLUDED NUDGING TEMPERATURES UP A  
FEW DEGREES UNDER CLEAR SKIES. FIRE ACTIVITY COULD INCREASE GIVEN  
THE WARM AND DRY DAYS ALTHOUGH NIGHT TIME RH RECOVERY WILL BE  
EXCELLENT. SINCE HIGH PRESSURE WILL BE DOMINATING, LOCAL VALLEYS  
NEAR ACTIVE FIRES WILL LIKELY EXPERIENCE REDUCED AIR QUALITY BY  
THE END OF THE WEEK. /AB  
 

 
   
AVIATION
 
 
00Z TAFS: ISOLATED SHOWERS ARE EXPECTED IN AND AROUND THE KPUW AND  
KLWS TAF SITES THROUGH THE EARLY EVENING. THESE SHOWERS WILL  
DISSIPATE THROUGH THE EVENING. MID LEVEL MOISTURE AND CLOUDS WILL  
WRAP IN OVER THE REGION THROUGH SATURDAY. THERE IS A SLIGHT  
CHANCE THAT THIS MOISTURE WILL RESULT IN LIGHT RAIN ACROSS THE  
NORTHERN PANHANDLE LATE TONIGHT INTO SATURDAY MORNING. ISOLATED  
AFTERNOON SHOWERS WILL THEN BE POSSIBLE OVER EXTREME EASTERN WA  
AND THE ID PANHANDLE FOR SATURDAY AFTERNOON. EXPECT SCATTERED CIGS  
BETWEEN 5-8 KFT OVER THE ID PANHANDLE WITH MOUNTAIN OBSCURATIONS  
POSSIBLE. /SVH  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
SPOKANE 44 62 42 64 46 66 / 10 10 10 0 10 10  
COEUR D'ALENE 40 60 38 64 42 66 / 10 10 10 10 10 10  
PULLMAN 40 59 39 63 42 66 / 0 10 10 0 0 10  
LEWISTON 45 66 44 68 48 71 / 10 10 0 0 0 10  
COLVILLE 41 65 38 68 43 70 / 10 10 10 10 10 10  
SANDPOINT 40 59 35 63 41 65 / 10 10 10 10 10 10  
KELLOGG 37 55 35 61 41 63 / 10 10 10 10 10 10  
MOSES LAKE 45 69 43 70 46 73 / 0 0 0 0 0 10  
WENATCHEE 49 70 48 71 50 73 / 0 0 0 10 10 10  
OMAK 44 69 42 71 44 73 / 0 0 0 10 10 10  
 

 
   
OTX WATCHES/WARNINGS/ADVISORIES
 
 
ID...NONE.  
WA...NONE.  
 

 
 

 
 
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