WWCN11 CWTO 121859

YELLOW WATCH - SNOW SQUALL

FOR SOUTHERN ONTARIO

ISSUED BY ENVIRONMENT CANADA

AT 1:59 P.M. EST FRIDAY 12 DECEMBER 2025.

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YELLOW LEVEL WATCH - SNOW SQUALL - FOR:

=NEW= WINGHAM - BLYTH - NORTHERN HURON COUNTY

=NEW= LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY

=NEW= MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY

=NEW= ORANGEVILLE - GRAND VALLEY - SOUTHERN DUFFERIN COUNTY

=NEW= SHELBURNE - MANSFIELD - NORTHERN DUFFERIN COUNTY

=NEW= GREY - BRUCE.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



SNOW SQUALLS EXPECTED OFF LAKE HURON AND GEORGIAN BAY THIS WEEKEND. 



WHAT: 

SNOWFALL ACCUMULATIONS OF 20 TO 40 CM. LOCALLY HIGHER AMOUNTS 

POSSIBLE. 

POOR VISIBILITY IN AREAS OF HEAVY SNOW AND BLOWING SNOW. 



WHEN: 

BEGINNING TONIGHT OR SATURDAY MORNING, AND CONTINUING INTO SUNDAY. 



ADDITIONAL INFORMATION: 

LAKE EFFECT SNOW SQUALLS ARE EXPECTED TO DEVELOP TONIGHT NEAR LAKE 

HURON DUE TO INCREASING SOUTHWEST WINDS. AS WINDS BECOME MORE 

WESTERLY SATURDAY MORNING, THE LAKE EFFECT ACTIVITY WILL SPREAD 

FARTHER INLAND. 



WESTERLY WINDS GUSTING UP TO 60 KM/H WILL CREATE AREAS OF BLOWING 

SNOW, FURTHER REDUCING VISIBILITY. 



WINDS WILL BECOME MORE NORTHERLY ON SATURDAY NIGHT, WHICH WILL CAUSE 

THE LAKE EFFECT SNOW BANDS TO SHIFT. LAKE EFFECT BANDS OFF GEORGIAN 

BAY WILL ALSO AFFECT AREAS SOUTH OF IT. 



CONDITIONS SHOULD IMPROVE OVER ALL AREAS BY MONDAY MORNING.



TRAVEL MAY BE HAZARDOUS. VISIBILITY MAY BE SUDDENLY REDUCED TO NEAR 

ZERO AT TIMES. CONSIDER RESCHEDULING TRAVEL AND OUTDOOR ACTIVITIES. 

PREPARE FOR THE POSSIBILITY OF QUICKLY CHANGING AND DETERIORATING 

TRAVEL CONDITIONS. 



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