640  
FXCN38 CWEG 232055  
TAF FORECASTER NOTES ISSUED BY THE CANADIAN AVIATION METEOROLOGICAL  
CENTRE AT 2115 UTC TUESDAY 23 MAY 2017.  
 
CYYC - CALGARY INTL.  
 
A WEAKENING UPPER RIDGE IS KEEPING SOUTHERN ALBERTA MAINLY CLEAR AND  
DRY THIS AFTERNOON AND EVENING. SOUTHWESTERLY WINDS HAVE STRENGTHENED  
THIS AFTERNOON WITH UPPER LEVEL WINDS MIXING DOWN TO THE SURFACE DUE  
TO THE STRONG DAYTIME HEATING.  
 
AS WELL...INCREASING SOUTHWESTERLY UPPER WINDS ALONG THE ROCKIES WILL  
A PRODUCE THE POTENTIAL FOR SOME MODERATE LEE WAVE TURBULENCE BLO  
FL140 ALONG THE FOOTHILLS LATE THIS AFTERNOON.  
 
OVERNIGHT TONIGHT AND INTO WEDNESDAY MORNING, A DEEPENING LOW AND  
ASSOCIATED COLD FRONT WILL BEGIN TO SWEEP THROUGH ALBERTA FROM  
CENTRAL BC. EXPECT STRONG GUSTY NORTHWESTERLY WINDS UP TO 40 KTS AS  
THE FRONT SWEEPS THROUGH CALGARY EARLY WEDNESDAY MORNING. WITH THE  
PASSAGE OF THIS FRONT, SHOWERS TURNING TO STEADY RAIN ARE FORECAST,  
WHILE TEMPERATURES WILL DROP SHARPLY. THERE IS THE LIKELIHOOD OF SNOW  
AT HIGHER ELEVATIONS (MAINLY THE ROCKY MOUNTAINS AND HIGHER FOOTHILLS  
TO THE WEST OF THE TERMINAL), AND THE POSSIBILITY OF SOME WET SNOW  
DURING THE COOL EVENING HOURS OF WEDNESDAY NIGHT.  
 
OUTLOOK: THE STEADY RAIN MIXED WITH PERIODS OF WET STICKY SNOW SHOULD  
CONTINUE WELL INTO THURSDAY MORNING WITH IFR CLOUD CEILINGS AND  
HOWLING GUSTY NORTHERLY WINDS UP TO 40 KTS BEFORE THE WET SNOW ENDS  
AND A CLEARING TREND DEVELOPS THURSDAY AFTERNOON AS THE NORTHERLY  
WINDS SLOWLY ABATE.  
 
CLEARING SKIES THURSDAY NIGHT SHOULD LEAD TO SUNNY AND DRIER  
CONDITIONS WITH OVERALL LIGHTER WINDS AND MUCH WARMER VFR CONDITIONS  
ON FRIDAY. SUNNY AND WARM CONDITIONS WILL PERSIST INTO THE WEEKEND AS  
AN UPPER RIDGE REBUILDS OVER BC AND ALBERTA THUS DEFLECTING ALL  
INCOMING PACIFIC MOISTURE WELL NORTH INTO THE NORTHWEST TERRITORIES.  
 
VARIABILITY: LO.  
 
FORECASTER CONFIDENCE NEXT 3 HOURS: HI.  
 
FORECASTER CONFIDENCE NEXT 6 HOURS: HI.  
 
END/GENDRON/CMAC-W  
 
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