581  
FXCN38 CWEG 190552  
TAF FORECASTER NOTES ISSUED BY THE CANADIAN AVIATION METEOROLOGICAL  
CENTRE AT 0615 UTC THURSDAY 19 OCTOBER 2017.  
 
CYYC - CALGARY INTL.  
 
A STRONG SOUTHWESTERLY FLOW ALOFT IS PRODUCING CHINOOK CLOUDINESS  
OVER THE REGION. A SHARP LEE TROUGH IS SITTING RIGHT OVER THE CITY OF  
CALGARY AND MAKING IT VERY DIFFICULT TO NAIL DOWN THE WINDS. JUST THE  
THE WEST OF THE REGION THERE ARE VERY STRONG WESTERLY WINDS.  
 
SOUTHERLY WINDS SHOULD RETURN TONIGHT AS THE LEE TROUGH SLOWLY BEGINS  
TO MIGRATE EASTWARD. CURRENT GUIDANCE SUGGESTS THAT THE LEE TROUGH  
WILL BE VERY SHARP AND SHOULD LIE VERY NEAR TO THE AIRPORT BY  
MORNING. STRONG WESTERLY WINDS SHOULD DEVELOP NEAR THE TERMINAL  
BEFORE MORNING BUT THE GRADIENT SHOULD RELAX QUICKLY JUST BEFORE  
SUNRISE, WEAKENING THE WINDS FAIRLY RAPIDLY AND PRODUCING A SHIFT  
BACK TO LIGHT SOUTHERLIES. LEE WAVE TURBULENCE WILL BE PRESENT WEST  
OF THE TROUGH ALONG THE FOOTHILLS.  
 
OUTLOOK: CHINOOK CLOUDINESS SHOULD PERSIST THROUGH THURSDAY BUT THE  
THREAT OF STRONG WINDS IS MUCH REDUCED AS AN UPPER TROUGH STARTS TO  
MOVE INTO BC.  
 
WEATHER VARIABILITY: LO.  
 
FORECASTER CONFIDENCE NEXT 3 HOURS: HI.  
 
FORECASTER CONFIDENCE NEXT 6 HOURS: HI.  
 
END/PEIRSONR/CMAC-W  
 
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