PASPC Thunderstorm Outlook Day 1

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FOCN45 CWWG 261900

SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CDT TUESDAY SEPTEMBER 26 2017.

ALERTS IN EFFECT...NONE.

SYNOPTIC OVERVIEW...HIGH AMPLITUDE UPPER TROF SE SASKATCHEWAN TO CALIFORNIA SLOWLY EDGING EASTWARD ALLOWING UPPER RIDGE TO FINALLY REBUILD OVER WEST COAST WEDNESDAY. UPPER LOW IN ND BEING EJECTED THROUGH SOUTHERN MB TODAY AND THEN NORTHERN ONTARIO TONIGHT. MOSTLY ZONAL FLOW ACROSS ARCTIC WITH EMBEDD SHORTWAVE TROF NEAR GREAT SLAVE LAKE THIS MORNING. SHORTWAVE TRACKS THROUGH NORTHERN MB WEDNESDAY.

DISCUSSION...

MANITOBA...ORGANIZED RAIN IN SOUTHWESTERN MB TODAY SUPPORTED BY JETSTREAK IN SOUTHWESTERLY DIVERGENT FLOW ALOFT AHEAD OF ND UPPER LOW. RAINFALL AMOUNTS 5 TO 15 MM SOUTHEAST OF WINNIPEG TODAY. LIKELY SOME FOG OVERNIGHT AFTER RAIN.

SASKATCHEWAN...BOUNDARY CLOUD AND ISOLATED SHOWERS, MAINLY OVER EASTERN HALF. ISOLATED LIGHTNING STRIKES ALONG FRONTAL FEATURE IN NORTHERN SK TODAY MOVES INTO NORTHERN MB WEDNESDAY.

ALBERTA...BUILDING UPPER RIDGE OF HIGH PRESSURE MOVING IN FROM BC WILL PROVIDE FAIR AND DRY WEATHER OVER THE NEXT FEW DAYS. SOME REMNANT MID-LEVEL INSTABILILTY GIVING A FEW ISOLATED SHOWERS TODAY AND TONIGHT IN CENTRAL ALBERTA.

NORTHWEST TERRITORIES...A FEW SHOWERS, WET FLURRIES OR PERIODS OF DRIZZLE IN THE WAKE OF THE TROUGH OVER THE DELTA AND THE NORTHERN PORTION OF THE MACKENZIE RIVER TODAY.

KIVALLIQ...INCREASING CLOUD AS THE TROUGH APPROACHES AND BRINGS SHOWERS TO THE REGION.

HIGH ARCTIC...THE AFOREMENTIONED TROUGH WILL BRING SNOW TO RESOLUTE TONIGHT AND THROUGH WEDNESDAY. HEAVIEST SNOW WILL BE TONIGHT WITH INDICATIONS OF POTENTIALLY 10 CM JUST EAST OF RESOLUTE. IF THE SYSTEM INTENSIFIES FASTER THAN EXPECTED SNOWFALL WARNING IS POSSIBLE. TOMORROW AFTERNOON WINDS SHIFT TO NORTHWESTERLY AND STRENGTHEN INTO THE NIGHT. GUSTS TO 80 KM/H ARE POSSIBLE COMBINED WITH RECENT SNOW AND FALLING SNOW LOW VISIBILITIES ARE LIKELY WITH THE POTENTIAL FOR A SHORT DURATION BLIZZARD.

BAFFIN...BOUNDARY LAYER CLOUD AND FLURRIES ARE THE ONLY CONCERN.

END/PASPC