380  
FXUS66 KOTX 222320  
AFDOTX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SPOKANE WA  
420 PM PDT SAT JUL 22 2017  
   
SYNOPSIS
 
 
SUNDAY WILL BRING ANOTHER WARM AND QUIET SUNNY DAY TO THE REGION.  
A BREEZY COLD FRONT WILL ARRIVE SUNDAY NIGHT BUT WILL HAVE ONLY A  
MILD IMPACT ON TEMPERATURES ON MONDAY. AN INCREASING CHANCE OF  
THUNDERSTORMS WILL OCCUR BY MID-WEEK AND THE REMAINDER OF THE  
WORK WEEK WILL BE COOLER AND BREEZY.  
 

 
   
DISCUSSION
 
 
TONIGHT THROUGH MONDAY...QUIET AND BENIGN WEATHER WILL PREVAIL  
OVER THE REGION TONIGHT AND SUNDAY WITH A FLAT RIDGE HOLDING SWAY  
ALOFT AND A SURFACE THERMAL TROUGH ANCHORED OVER THE COLUMBIA  
BASIN.  
 
SUNDAY WILL ALSO PROVIDE QUIET CONDITIONS BUT A FEW DEGREES  
WARMER THAN TODAY AND MORE NOTICEABLE BUT MODERATE WINDS DURING  
THE AFTERNOON. SUNDAY EVENING WILL BRING A SIGNIFICANT CHANGE. ON  
SATELLITE CIRCULATION VISIBLE IN THE PACIFIC OFF THE ALASKA  
PANHANDLE REPRESENTS AN UPPER LOW PRESSURE WHICH WILL EJECT INTO  
BRITISH COLUMBIA DURING THE DAY TOMORROW. THIS PASSING WAVE WILL  
MANIFEST ITSELF AS AN AGGRESSIVE PUSH OF DRY AND ONLY SLIGHTLY  
COOLER AIR FIRST THROUGH THE CASCADE GAPS IN THE LATE AFTERNOON  
AND EARLY EVENING...AND THEN DOWN THE OKANOGAN VALLEY NEAR OR  
AFTER SUNSET. THIS WINDY PATTERN OCCURRING AT THE BEGINNING OF  
NOCTURNAL RH RECOVERIES WILL PROBABLY CREATE A 2 TO 4 HOUR PERIOD  
OF WIND AND RH RED FLAG CONDITIONS IN THE WENATCHEE/LAKE CHELAN  
AND METHOW VALLEYS AND THEN THE OKANOGAN VALLEY AS WINDS VEER TO  
THE NORTH. RH SHOULD RECOVER TO ABOVE CRITICAL VALUES AS DARKNESS  
FALLS BUT THESE AREAS WILL REMAIN QUITE WINDY WITH SUSTAINED WINDS  
IN THE 20 MPH RANGE WITH GUSTS UP TO 35 MPH IN SOME TERRAIN  
CHANNELED LOCATIONS. OVERNIGHT THE WIND FIELD WILL BROADEN OUT TO  
ENCOMPASS MUCH OF THE WESTERN BASIN AS WELL AND IT IS POSSIBLE  
SOME BLOWING DUST MAY MENACE THE DEEP BASIN DURING THE EVENING AND  
OVERNIGHT HOURS.  
 
MONDAY WILL FEATURE A QUIETER WIND FIELD...ALTHOUGH STILL LOCALLY  
BREEZY...WITH SLIGHTLY COOLER TEMPERATURES BUT STILL ABOVE NORMAL  
AND DRY AND SUNNY CONDITIONS THROUGH OUT THE REGION AS THE  
OFFENDING TROUGH SKULKS OFF TO THE EAST INTO THE CANADIAN PRAIRIE  
PROVINCES. /FUGAZZI  
 
MONDAY NIGHT THROUGH SATURDAY: THE UPPER LEVEL LOW AND ASSOCIATED  
FRONT WILL CONTINUE TO EXIT THE REGION TO THE EAST. THIS WILL  
ALLOW FOR A PERIOD OF WEAK SHORTWAVE RIDGING TO SET IN BY TUESDAY  
AS A CLOSED LOW SETS UP OFF THE CALIFORNIA COAST. THE CA LOW WILL  
EVENTUALLY BUCKLE OUR FLOW TO A MORE SOUTHERLY DIRECTION AND IN  
RESPONSE, ALLOW FOR MOISTURE AND FINER SCALE DISTURBANCE TO  
APPROACH FROM THE SOUTH. THESE FEATURES LOOK TO REMAIN SOUTH OF  
OUR FORECAST AREA UNTIL LATER WEDNESDAY ALLOWING FOR DRY  
CONDITIONS AND PLENTY OF SUNSHINE.  
 
BY WEDNESDAY AFTERNOON AND OVERNIGHT, THE PUSH OF MOISTURE  
ARRIVES AND MAY ALLOW FOR SOME THUNDERSTORM CHANCES. MODEL  
CONSISTENCY IN THE TIMING OF THE MOISTURE AND PLACEMENT OF  
ACCOMPANYING WAVES HAS NOT BEEN GREAT SO CONFIDENCE IS LOW IN THE  
DETAILS. THE LATEST GFS BRINGS A WAVE FURTHER WEST AND THUS, IN  
COLLABORATION WITH NEIGHBORING OFFICES, HAVE INTRODUCED A SMALL  
MENTION OF THUNDER ALONG THE CASCADE CREST IN ADDITION TO THE  
INHERITED THUNDER ACROSS OUR SE ZONES. THIS PORTION OF THE  
FORECAST WILL NEED TO CONTINUE TO BE REFINED AS WE PROGRESS.  
 
THURSDAY AND BEYOND LOOKS TO CONTINUE THE WARM TEMPERATURES AND  
DRY CONDITIONS WITH HIGHS IN THE MID 80 TO MID 90S. ANOTHER DRY  
COLD FRONT IN THE FAR EXTENDED COULD ALSO POTENTIALLY BRING BREEZY  
CONDITIONS BACK TO THE REGION. /KALIN  
 

 
   
AVIATION
 
 
00Z TAFS: HIGH PRESSURE WILL PROVIDE DRY, VFR CONDITIONS AT TAF  
SITES. LIGHT WINDS WILL PREVAIL TONIGHT/EARLY SUNDAY BUT THE  
APPROACH OF A DRY COLD FRONT WILL LEAD TO SLIGHTLY STRONGER  
WINDS TOWARD MIDDAY TO AFTERNOON SUNDAY. GUSTS OF 15-25 MPH WILL  
BE POSSIBLE IN THE EXPOSED AREAS. /J. COTE'  
 

 
   
PRELIMINARY POINT TEMPS/POPS
 
 
SPOKANE 64 92 62 87 61 91 / 0 0 0 0 0 10  
COEUR D'ALENE 60 92 58 86 55 90 / 0 0 0 0 0 10  
PULLMAN 60 92 58 87 57 90 / 0 0 0 10 10 10  
LEWISTON 66 100 67 95 65 97 / 0 0 0 10 10 10  
COLVILLE 57 92 53 88 53 93 / 0 0 0 0 0 0  
SANDPOINT 53 90 50 85 49 89 / 0 0 0 0 0 10  
KELLOGG 56 88 56 85 54 88 / 0 0 0 10 10 10  
MOSES LAKE 62 97 60 92 58 95 / 0 0 0 0 0 0  
WENATCHEE 67 94 64 90 65 93 / 0 0 0 0 0 0  
OMAK 62 96 60 91 60 95 / 0 0 0 0 0 0  
 

 
   
OTX WATCHES/WARNINGS/ADVISORIES
 
 
ID...NONE.  
WA...RED FLAG WARNING FROM 5 PM TO 10 PM PDT SUNDAY FOR EAST  
WASHINGTON CENTRAL CASCADE VALLEYS (ZONE 677)-EAST  
WASHINGTON OKANOGAN/METHOW VALLEYS (ZONE 684).  
 

 
 

 
 
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