WUCN11 CWTO 012126

YELLOW WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 5:26 P.M. EDT WEDNESDAY 1 JULY 2026.

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YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

=NEW= CORNWALL - LANCASTER

=NEW= MAXVILLE - ALEXANDRIA

      MORRISBURG - LONG SAULT

      WINCHESTER - NEWINGTON.



YELLOW LEVEL WARNING - SEVERE THUNDERSTORM - ENDED FOR:

      BROCKVILLE - LEEDS AND GRENVILLE.



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IMPACT LEVEL: MODERATE

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 7:17 P.M. EDT.



AT 5:26 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

CLUSTER OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING STRONG WIND 

GUSTS, UP TO QUARTER SIZE HAIL AND HEAVY RAIN.



THUNDERSTORM LOCATION: OVER WILLIAMSBURG 



MOTION: MOVING EAST AT 40 KM/H 



HAZARDS: 

WIND: STRONG, UP TO 90 KM/H 

HAIL: UP TO QUARTER SIZE (UP TO 2.5 CM) 

RAIN: HEAVY, POSSIBLY EXCEEDING 50 MM IN AN HOUR 



LOCATIONS IN THE PATH: 

WILLIAMSBURG 

CHESTERVILLE 

FINCH 

NEWINGTON 

INGLESIDE 

AVONMORE 

LONG SAULT 

MONKLAND 

ST. ANDREWS



LOCAL UTILITY OUTAGES ARE LIKELY. HEAVY RAIN MAY CAUSE FLASH 

FLOODING AND SIGNIFICANT REDUCTIONS TO VISIBILITY. TAKE IMMEDIATE 

COVER IF A THUNDERSTORM APPROACHES. IF OUTSIDE, PROTECT YOURSELF 

FROM FLYING DEBRIS AND HAIL. SEVERE THUNDERSTORM WARNINGS ARE ISSUED 

WHEN IMMINENT OR OCCURRING THUNDERSTORMS ARE EXPECTED TO PRODUCE 

DAMAGING HAIL, WIND OR RAIN. 



EMERGENCY MANAGEMENT ONTARIO RECOMMENDS THAT YOU TAKE COVER 

IMMEDIATELY IF THREATENING WEATHER APPROACHES. 



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: 

HTTPS://WWW.ONTARIO.CA/PAGE/BE-PREPARED-EMERGENCY.



HTTP://WEATHER.GC.CA



END/OSPC



WUCN11 CWTO 012126

ORANGE WARNING - SEVERE THUNDERSTORM

FOR SOUTHERN ONTARIO

UPDATED BY ENVIRONMENT CANADA

AT 5:26 P.M. EDT WEDNESDAY 1 JULY 2026.

---------------------------------------------------------------------

ORANGE LEVEL WARNING - SEVERE THUNDERSTORM - FOR:

      OTTAWA NORTH - KANATA - ORLEANS

      GATINEAU

      PRESCOTT AND RUSSELL.



---------------------------------------------------------------------

IMPACT LEVEL: HIGH

FORECAST CONFIDENCE: HIGH



==DISCUSSION==



UPDATED OR ENDED BY 7:24 P.M. EDT.



AT 5:25 P.M. EDT, ENVIRONMENT CANADA METEOROLOGISTS ARE TRACKING A 

LINE OF DANGEROUS THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WIND 

GUSTS, LOONIE TO PING PONG BALL SIZE HAIL AND EXTREMELY HEAVY RAIN.



THUNDERSTORM LOCATION: FROM AREAS WEST OF OTTAWA TO NORTHWEST OF 

GATINEAU. 



MOTION: MOVING SOUTHEASTWARD NEAR 40 KM/H 



HAZARDS: WIND: DAMAGING (90 - 110 KM/H) 

HAIL: UP TO TOONIE SIZE (UP TO 3 CM) 

RAIN: 50MM AND LOCALLY NEAR 110MM NEAR SOUTH OTTAWA 



DISCUSSION: A LINE OF THUNDERSTORMS WILL MOVE FROM WEST TO EAST 

ACROSS THE REGIONS LATE THIS AFTERNOON. 90 MILLIMETERS OF RAIN HAS 

BEEN REPORTED AT THE OTTAWA INTERNATIONAL AIRPORT AND MAY RECEIVE 

TOTAL AMOUINTS NEAR 110 MILLIMETERS BY THIS EVENING DUE TO THIS NEW 

LINE OF THUNDERSTORMS. 



LOCATIONS IN THE PATH: 

CONSTANCE BAY, GLENEAGLE, HEYWORTH, QUINNVILLE, CHELSEA, OLD 

CHELSEA, HOLLOW GLEN, ANGERS, DUNROBIN, KINBURN, GATINEAU, 

TEMPLETON, POINTE-GATINEAU, CUMBERLAND, KILROY CRESCENT, MARATHON 

VILLAGE, ORLEANS, HULL, BEACONWOOD, VANIER, AYLMER, CARP, BLACKBURN 

HAMLET, OTTAWA, SARSFIELD, NAVAN, MOONEYS BAY BEACH, KANATA, BELLS 

CORNERS, BOWESVILLE, STITTSVILLE, VARS, BARRHAVEN, SOUTH GLOUCESTER, 

LIMOGES, CASSELMAN, RUSSELL, EMBRUN



TRAVEL DELAYS AND/OR CANCELLATIONS ARE LIKELY. DRIVING CONDITIONS 

WILL LIKELY BE DIFFICULT. UTILITY OUTAGES ARE LIKELY. HEAVY RAIN 

WILL LIKELY CAUSE FLASH FLOODING AND SIGNIFICANT REDUCTIONS TO 

VISIBILITY. FAST-MOVING AND RAPIDLY RISING WATER CAN SWEEP VEHICLES 

AWAY AND DAMAGE INFRASTRUCTURE. TAKE IMMEDIATE COVER IF A 

THUNDERSTORM APPROACHES. IF OUTSIDE, PROTECT YOURSELF FROM FLYING 

DEBRIS AND HAIL. DON'T DRIVE THROUGH FLOODED ROADWAYS. SEVERE 

THUNDERSTORM WARNINGS ARE ISSUED WHEN IMMINENT OR OCCURRING 

THUNDERSTORMS ARE EXPECTED TO PRODUCE DAMAGING HAIL, WIND OR RAIN. 



EMERGENCY MANAGEMENT ONTARIO RECOMMENDS THAT YOU TAKE COVER 

IMMEDIATELY IF THREATENING WEATHER APPROACHES. 



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. TO 

REPORT SEVERE WEATHER IN GATINEAU, SEND AN EMAIL TO 

ONSTORM(AT)EC.GC.CA OR POST REPORTS ON X USING (HASH)QCSTORM. 



FOR MORE INFORMATION: 

HTTPS://WWW.ONTARIO.CA/PAGE/BE-PREPARED-EMERGENCY.



HTTP://WEATHER.GC.CA



END/OSPC