992  
FXUS66 KOTX 242305  
AFDOTX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SPOKANE WA  
405 PM PDT THU SEP 24 2020  
   
SYNOPSIS
 
 
MAINLY MOUNTAIN SHOWERS ARE EXPECTED TONIGHT WITH MORE WIDESPREAD  
RAIN FRIDAY AS ANOTHER WEATHER SYSTEM TRACKS ACROSS THE REGION.  
BREEZY TO LOCALLY WINDY CONDITIONS WILL PERSIST INTO FRIDAY. DRIER  
WEATHER IS EXPECTED OVER THE WEEKEND WITH A PROLONGED PERIOD OF  
ABOVE NORMAL TEMPERATURES AND DRY WEATHER FOR NEXT WEEK.  
 

 
   
DISCUSSION
 
 
TONIGHT AND FRIDAY: A BREAK IN BETWEEN SHORTWAVES WILL BRING SOME  
ISOLATED MOUNTAINS OVERNIGHT. BY FRIDAY MORNING, THE LOW OVER THE  
GULF OF ALASKA MOVES INTO CENTRAL BC, AND FORCES A ROUND OF  
MOISTURE WITH A SHORTWAVE THROUGH THE REGION ON FRIDAY.  
WIDESPREAD SHOWERS ARE EXPECTED. MODELS ARE STILL PUSHING THE WAVE  
THROUGH QUICKLY AND TRAPPING MOST OF THE MOISTURE ALONG THE  
CASCADES. THE CASCADES COULD SEE ANOTHER 0.5" TO 1". THE BASIN  
AREAS CAN EXPECT ANOTHER FEW HUNDREDTHS. THE ID PANHANDLE COULD  
RECEIVE ANOTHER COUPLE OF TENTHS. WINDS ARE EXPECTED TO BREEZY FOR  
THE FRIDAY AFTERNOON. THE WIND DIRECTION WILL BE WESTERLY. MODELS  
ARE SHOWING 850MB WINDS IN THE 40 KTS AND SURFACE WINDS NEAR 35  
KTS. BASIN WINDS IN THE MORNING EXPECTED TO BE IN THE TEENS FOR  
SUSTAINED WITH GUSTS INTO THE 20S. AFTERNOON WINDS FOR THIS PERIOD  
COULD SEE GUSTS ACROSS THE BASIN REACH INTO THE LOW 40S WITH  
DECENT AFTERNOON MIXING. HIGHS ON FRIDAY WILL BE MAINLY IN THE  
60S. OVERNIGHT LOWS ON THURSDAY WILL BE IN THE 50S TO UPPER 40S.  
THE NORTHERN MOUNTAINS AND VALLEYS COULD SEE A DECENT DROP IN  
OVERNIGHT LOWS ON FRIDAY WITH A RANGE OF MID 30S TO LOW 40S  
LEADING TO POSSIBLE FROST DEVELOPING IN /JDC  
 
SATURDAY INTO NEXT WEEK: WHAT LOOKED LIKE WOULD BE A WET AND BREEZY  
PATTERN THIS WEEKEND IS BEGINNING TO END EARLIER THAN PREVIOUS MODEL  
RUNS SHOWED. ON SATURDAY, THE THIRD ROUND OF RAIN WILL ENTER THE  
PACIFIC NORTHWEST WITH OUR NEXT SYSTEM ESCORTED BY THE JET STREAM.  
HOWEVER, HIGH PRESSURE TO OUR SOUTH IS BUILDING RAPIDLY AND  
THEREFORE KEEPING MOISTURE TO OUR NORTH IN B.C. STARTING SUNDAY. THE  
COLUMBIA BASIN WILL REMAIN DRY AND THE MAJORITY OF PRECIPITATION  
WILL REMAIN IN THE HIGHER ELEVATIONS. RAINFALL TOTALS LOOK LIGHT,  
ESPECIALLY COMPARED TO PREVIOUSLY ON FRIDAY. MOUNTAIN OROGRAPHIC  
SHOWERS MAY CONTINUE OVERNIGHT INTO EARLY SUNDAY MORNING HOURS,  
BEFORE THE START OF DRY WEATHER. SATURDAY'S WINDS WILL BE BREEZY  
WITH GUSTS UP TO 20-25 MPH IN THE BASIN, PALOUSE, AND WEST PLAINS.  
MOVING INTO SUNDAY AND BEYOND, AN AMPLIFYING RIDGE BUILDS OVER THE  
REGION AS THE HIGH FINDS ITSELF AT HOME IN THE WESTERN U.S. THIS  
BEGINS A DRY, WARMING TREND FOR THE WEEK AHEAD. TEMPERATURES WILL BE  
ABOVE SEASONAL NORMS AND BY MID-WEEK, HIGHS MAY REACH 10+ DEGREES  
WARMER. OVERNIGHT LOWS WILL STILL BE COOL, ESPECIALLY WITH CLEAR  
SKIES, AS THEY DROP INTO THE 40S AND 50S. JS  
 

 
   
AVIATION
 
 
00Z TAFS: BREEZY WINDS WILL CONTINUE ACROSS THE REGION INTO EARLY  
EVENING WITH WEST-SOUTHWEST WINDS GUSTING TO 20-30 KTS FOR MOST  
OF THE TAF SITES. WINDS WILL DECLINE OVERNIGHT BEFORE THE NEXT  
SYSTEM BRINGS ANOTHER ROUND OF GUSTS 20-30 KTS AND SHOWERS  
THROUGH FRIDAY. LOW LEVEL CEILINGS FOR GEG-SFF-COE AFTER 20Z ARE  
EXPECTED TO BRING MVFR. /JDC  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
SPOKANE 46 57 40 62 40 65 / 30 100 60 20 10 0  
COEUR D'ALENE 46 56 41 61 38 64 / 40 100 80 30 20 10  
PULLMAN 44 58 40 61 38 64 / 10 90 70 20 20 0  
LEWISTON 51 65 49 67 46 70 / 10 80 70 30 20 0  
COLVILLE 40 59 33 66 35 67 / 30 100 60 20 10 10  
SANDPOINT 43 54 37 59 35 61 / 50 100 90 30 20 10  
KELLOGG 48 56 44 57 42 62 / 30 90 90 40 20 10  
MOSES LAKE 48 64 42 68 40 69 / 30 80 20 10 0 0  
WENATCHEE 53 62 48 67 47 69 / 50 90 40 20 10 10  
OMAK 47 62 40 66 42 66 / 30 100 30 10 10 10  
 

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

 
 

 
 
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