618
WWCN11 CWTO 290930
ORANGE WARNING - SNOW SQUALL
FOR SOUTHERN ONTARIO
ISSUED BY ENVIRONMENT CANADA
AT 4:30 A.M. EST MONDAY 29 DECEMBER 2025.
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ORANGE LEVEL WARNING - SNOW SQUALL - FOR:
=NEW= INNISFIL - NEW TECUMSETH - ANGUS
=NEW= BARRIE - ORILLIA - MIDLAND.
ORANGE LEVEL WARNING - SNOW SQUALL - REPLACES ORANGE LEVEL WATCH -
SNOW SQUALL - FOR:
INNISFIL - NEW TECUMSETH - ANGUS
BARRIE - ORILLIA - MIDLAND.
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IMPACT LEVEL: EXTREME
FORECAST CONFIDENCE: HIGH
==DISCUSSION==
DANGEROUS SNOW SQUALLS AND BLIZZARD CONDITIONS LATE THIS MORNING
INTO TUESDAY.
WHAT:
BLIZZARD CONDITIONS WITH NEAR ZERO VISIBILITY.
TOTAL LOCAL SNOWFALL AMOUNTS OF 25 TO 45 CM.
WHEN:
BEGINNING LATE THIS MORNING AND EASING TO SCATTERED FLURRIES TUESDAY
AFTERNOON.
WHERE:
HIGHEST SNOWFALL AMOUNTS ARE EXPECTED SOUTHEAST OF GEORGIAN BAY FOR
AREAS WEST OF HIGHWAY 12.
ADDITIONAL INFORMATION:
AN INITIAL BRIEF, INTENSE SNOW SQUALL IS EXPECTED LATE THIS MORNING
ALONG A COLD FRONT. A QUICK 5 CM OF SNOW IS EXPECTED FROM THIS SNOW
SQUALL AS WELL AS A RAPID TEMPERATURE DROP, LEADING TO ICY SURFACES.
LAKE EFFECT SNOW SQUALLS OFF GEORGIAN BAY WILL DEVELOP THIS
AFTERNOON. WIDESPREAD BLOWING SNOW AND BLIZZARD CONDITIONS WILL BE
THE PRIMARY CONCERN AS NORTHWESTERLY WIND GUSTS OF 70 TO 90 KM/H ARE
EXPECTED TODAY INTO TONIGHT.
TRAVEL WILL LIKELY BE EXTREMELY HAZARDOUS AND SOME ROUTES WILL
LIKELY BE IMPASSABLE. VISIBILITY WILL LIKELY BE SUDDENLY REDUCED TO
NEAR ZERO AT TIMES. ROAD CLOSURES ARE LIKELY. PREPARE FOR EXTREMELY
DANGEROUS TRAVEL CONDITIONS. ALL TRAVEL AND OUTDOOR ACTIVITIES
SHOULD BE AVOIDED.
PLEASE CONTINUE TO MONITOR ALERTS AND FORECASTS ISSUED BY
ENVIRONMENT CANADA.
TO REPORT SEVERE WEATHER IN ONTARIO, SEND AN EMAIL TO
ONSTORM(AT)EC.GC.CA OR POST REPORTS ON X USING (HASH)ONSTORM.
FOR MORE INFORMATION ABOUT THE ALERTING PROGRAM, PLEASE VISIT:
HTTPS://WWW.CANADA.CA/EN/SERVICES/ENVIRONMENT/WEATHER/SEVEREWEATHER/WEATHER-ALERTS/COLOUR-CODED-ALERTS.
HTTP://WEATHER.GC.CA
END/OSPC
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