Friday November 15, 2013 DISCUSSION...AN UPPER COLD FRONT ASSOCIATED WITH THE MANITOBA LOW IS SWEEPING THROUGH ALBERTA GIVING SNOW SHOWERS WITH LOCALLY REDUCED VISIBILITIES IN SNOW AND BLOWING SNOW. THE MAIN AREA OF PRECIPITATION ASSOCIATED WITH THE LOW IN CENTRAL B.C. WILL CONTINUE TO MAKE ITS WAY FROM THE ALBERTA ELBOW REGION THROUGH TO SOUTHERN ALBERTA OVER THE NEXT 24 TO 36 HOURS. SNOWFALL ACCUMULATIONS OF 10 TO 15 CENTIMETRES ARE EXPECTED WITH THIS SYSTEM WITH LOCALLY GREATER ACCUMULATIONS POSSIBLE AND WARNINGS MAY BE EXTENDED AS THE SYSTEM DEVELOPS AND MORE INFORMATION IS AVAILABLE. AS AN ARCTIC RIDGE OF HIGH PRESSURE EXTENDS SOUTH BEHIND THE LOW STRONG NORTH TO NORTHEAST WINDS WILL DEVELOP SO THERES A POSSIBILITY OF REDUCED VISIBILITIES DUE TO FALLING BLOWING SNOW FOR THE OVERNIGHT PERIOD AND SATURDAY. COLD TEMPERATURES WILL INVADE ALBERTA BEHIND THE LOW FOR THE WEEKEND. THE EASTERN PRAIRIES WILL BE KEEPING AN EYE ON THE B.C. LOW OVER THE NEXT COUPLE OF DAYS, AS ITS WARNING-LEVEL SNOWFALL MAY SNEAK INTO PARTS OF SASKATCHEWAN THIS WEEKEND. WARNINGS WILL NEED TO BE CONSIDERED AFTER ALL AVAILABLE INFORMATION IS SCRUTINIZED. ELSEWHERE ON THE EASTERN PRAIRIES, THERES A WILD DIVERGENCE IN MODEL SOLUTIONS ON SUNDAY, AND THAT WILL HAVE A BIG IMPACT ON SOUTHERN MANITOBA--SOME MEMBERS HAVE THE REGION DRY, WHEREAS SOME HAVE IN EXCESS OF 10 CM OF SNOW IN THE RED RIVER VALLEY. THE WESTERN ARCTIC MAINLAND COAST WILL CONTINUE TO EXPERIENCE STRONG GUSTY WINDS FOR THE REMAINDER OF THE AFTERNOON AND SHOULD WEAKEN BY THE EVENING. AS THE LOW IN NORTHERN MANITOBA MOVES NORTH STRONG NORTHWEST WINDS WILL DEVELOP IN CAMBRIDGE BAY. CURRENT GUIDANCE INDICATE THAT VISIBILITIES SHOULD STAY ABOVE 400 METRES. IN ADDITION A NORTHEAST WIND IS PROVIDING SOME LIFT IN UPSLOPE AREAS OF THE FORT LIARD REGION. OVER 10 CENTIMETRES OF SNOW HAS BEEN REPORTED IN THE AREA. THE WIND SHOULD WEAKEN THIS EVENING AS THE RIDGE OF HIGH PRESSURE BUILDS SOUTH INTO ALBERTA THUS ENDING THE SNOW EVENT. THE EASTERN ARCTIC WILL HAVE A LITTLE BIT OF SIGNIFICANT WEATHER WITH WHICH TO DEAL THIS FORECAST PERIOD. IN THE WAKE OF THE NORTHERN MANITOBA LOW, WINDS WILL SHIFT TO THE NORTHWEST AND INCREASE. PREVIOUS RUNS OF THE GEM-REG HAD HAD THE WINDS GUSTING AS HIGH AS 80 KM/H OVER PARTS OF THE KIVALLIQ ON SATURDAY, BUT THE 12Z RUN HAS PULLED BACK CONSIDERABLY, MAXING OUT AT 60 KM/H. AS A RESULT, THE POTENTIAL FOR WIDESPREAD AND EXTENDED PERIODS OF BLOWING SNOW IS DECREASED, ALBEIT NOT TO ZERO. THIS WILL BEAR WATCHING.
Posted on: Fri, 15 Nov 2013 21:41:38 +0000
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