881
FOCN45 CWWG 051900
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT SUNDAY APRIL
5 2026.
ALERTS IN EFFECT...BLIZZARD WARNING FOR GJOA HAVEN.
SYNOPTIC OVERVIEW...ALOFT, DEEP UPPER LOWS OVER WESTERN ALASKA AND
NORTHERN ONTARIO WITH A NORTHWESTERLY FLOW OVER WESTERN CANADA.
STRONG SHORTWAVE TROUGH OVER SOUTHERN MB. UPPER HIGH OVER THE
BEAUFORT SEA AND UPPER LOW OVER BAFFIN ISLAND. NORTHERLY FLOW OVER
THE NORTHERN ARCTIC.
AT THE SURFACE, THERE ARE A SERIES OF WEAK LOWS FROM THE GULF OF
ALASKA TO NORTHERN ALBERTA, AND SOUTHERN MANITOBA. 1044 MB HIGH OVER
THE EASTERN NT.
DISCUSSION...
WESTERN PRAIRIES...A RIDGE BUILDING FROM THE ARCTIC CONTINUES TO
GENERATE A PERSISTENT EASTERLY FLOW ACROSS SOUTHERN ALBERTA.
THIS EASTERLY FLOW, COMBINED WITH A NW-SE H5 JET, HAS SET UP THE
PERFECT CONDITIONS FOR A PERSISTENT AREA OF PRECIPITATION EXTENDING
FROM THE ALBERTA ELBOW SOUTHEASTWARDS TO THE SK BORDER. PRECIPITATION
WILL BE MIXED SOUTH AND EAST OF CALGARY, WHEREAS CALGARY ITSELF, AND
AREAS JUST NORTH AND WEST OF THE CITY WILL SEE SNOW. 2-4 CM ARE
FORECAST, PARTICULARLY IN THE UPSLOPE FLOW ALONG THE ROCKIES.
TONIGHT, PERIODS OF SNOW WILL CONTINUE ACROSS THE SOUTH, ALONG WITH A
RISK OF FZDZ. THERE IS ALSO THE RISK OF FOG DEVELOPING SOUTH OF THE
BAROCLINIC ZONE. BEYOND TODAY, ATTENTION THEN TURNS TO THE NEXT
SYSTEM CURRENTLY APPROACHING FROM THE NORTHERN PACIFIC. ATTENDANT LOW
WITH THIS FEATURE WILL BRING A SWATH OF 10-20 CM OF SNOW MONDAY NIGHT
AND TUESDAY ACROSS NORTHERN ALBERTA, PRIMARILY NORTH OF EDMONTON.
ALERTS ARE LIKELY FORTHCOMING. MORE TO FOLLOW.
EASTERN PRAIRIES...LOW PASSING THROUGH SOUTHERN MANITOBA WILL
CONTINUE TO PRODUCE AN AREA OF INTERMITTENT PRECIPITATION THROUGH THE
DAY. THIS WILL GENERALLY BE IN THE FORM OF SHOWERS PERHAPS MIXED WITH
SOME WET SNOW. A VERY SLIGHT FREEZING RAIN RISK IS ALONG THE
FRONTOLYTIC COLD FRONT AND WILL NOT BE SELF SUSTAINING. HIGH PRESSURE
BUILDS IN BEHIND.
LOOKING AHEAD, AN ALBERTA CLIPPER WILL DEVELOP MONDAY NIGHT INTO
TUESDAY OVER ALBERTA AND QUICKLY TRAVEL EASTWARDS THROUGH THE
SOUTHERN PRAIRIES THROUGH MIDWEEK. ITS TOO EARLY TO GIVE A DEFINITIVE
FORECAST, BUT IT LOOKS AS IF ACCUMULATING SNOWFALL MAY BE A CONCERN
FOR A FAIR BIT OF CENTRAL ALBERTA, AS WELL AS SOUTHERN SK AND MB.
SIGH.
WESTERN ARCTIC...EMBEDDED WITHIN THE NORTHWESTERLY FLOW OVER THE
ARCTIC, A TROUGH WILL MOVE THROUGH THE EASTERN KITIKMEOT THIS MORNING
GENERATING SNOW AND BLOWING SNOW THROUGH MOST OF THE REGION.
A BLIZZARD WARNING REMAINS IN EFFECT FOR GJOA HAVEN, AS IT IS
ANTICIPATED THAT VISIBILITIES WILL RAPIDLY DETERIORATE LATER THIS
MORNING AND REMAIN POOR THROUGH THE AFTERNOON. IMPROVEMENT IS
EXPECTED THIS EVENING AS WINDS WEAKEN AND THE SYSTEM MOVES OUT OF THE
AREA. BLOWING SNOW IS POSSIBLE THROUGH MUCH OF THE NORTHWEST
ARCHIPELAGO AS WELL.
EASTERN ARCTIC...A STRENGTHENING GRADIENT OVER THE KIVALLIQ TODAY
WILL BRING NORTHWESTERLY WINDS OF 40 KM/H GUSTING TO 60 KM/H AND
BLOWING SNOW BUT BLIZZARD CONDITIONS ARE NOT EXPECTED AT THIS TIME.
WILL KEEP AN EYE ON THIS THOUGH AS KIVALLIQ HAS BEEN OVERPERFORMING
FOR BLIZZARDS OF LATE.
END/FULTON/VAN LOCHEM
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