urn:oid:2.49.0.1.124.1891733309.2026cap-pac@canada.ca2026-09-03T20:01:23-00:00ActualUpdateEnv. Can. - Can. Met. Ctr. – MontréalPublicprofile:CAP-CP:0.4layer:SOREM:1.0layer:EC-MSC-SMC:1.0layer:EC-MSC-SMC:1.1layer:SOREM:2.0Service Notice – July 2026: The Environment and Climate Change Canada (ECCC) CAP Service undergoes changes from time to time as the business of alerting evolves. For Spring 2026, changes are expected to include... 1) ECCC's deployment to introduce free-form polygons to represent the true threat area of a weather hazard, which was originally scheduled for June 2026, is delayed. We will communicate the new date when it is available. Monitor https://dd.weather.gc.ca/doc/genots/ for notifications on the new launch date. Information about free-form polygons representing the true threat area of a weather hazard remains under media embargo until launch, 2) marine alerts will now be issued for smaller zone splits in certain areas of Atlantic and Pacific waters and 3) other minor improvements and corrections. For more information on these changes: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/ | Notification de service – juillet 2026: Le service du PAC d’Environnement et Changement climatique Canada (ECCC) subit périodiquement des changements à mesure que le système d’alerte évolue. Pour le printemps 2026, il y aura des changements incluant... 1) Le déploiement par ECCC visant à introduire des polygones de forme libre pour représenter la zone réelle de menace d’un aléa météorologique, qui était initialement prévu pour juin 2026, est retardé. Nous communiquerons la nouvelle date lorsqu’elle sera disponible. Surveiller https://dd.weather.gc.ca/doc/genots/ pour les notifications concernant la nouvelle date de lancement. Les informations concernant les polygones de forme libre représentant la zone réelle de menace d’un aléa météorologique demeurent sous embargo médiatique jusqu’au lancement, 2) les alertes marines seront désormais émises pour des subdivisions de zones plus petites dans certaines régions des eaux de l’Atlantique et du Pacifique et 3) d’autres améliorations et corrections mineures. Pour plus d’informations sur ces changements: https://comm.collab.science.gc.ca/mailman3/hyperkitty/list/dd_info@comm.collab.science.gc.ca/cap-pac@canada.ca,urn:oid:2.49.0.1.124.1361133764.2026,2026-09-03T20:00:21-00:00en-CAMettornadoMonitorExpectedModerateLikelygeneral publicprofile:CAP-CP:Event:0.4tornadoSAMETOA2026-09-03T20:00:21-00:002026-09-03T20:00:00-00:002026-09-04T02:59:21-00:00Environment Canadatornado watch in effect
Conditions are favourable for the development of severe thunderstorms which may produce tornadoes. Strong winds, large hail and heavy rain are also possible.
A line of severe thunderstorms over Michigan will move across the lake late this afternoon and this evening. This line has a history of producing tornadoes.
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Significant damage or destruction to infrastructure, homes and the natural environment is possible.
Tornado watches are issued when conditions are favourable for the development of severe thunderstorms capable of producing tornadoes.
Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
In the event of a tornado, or if a tornado warning is issued for your area: go indoors to a room on the lowest floor, away from outside walls and windows, such as a basement, bathroom, stairwell or interior closet. Leave mobile homes, vehicles, tents, trailers and other temporary or free-standing shelter, and move to a strong building if you can. As a last resort, lie in a low spot and protect your head from flying debris. Be prepared for severe weather. If you hear a roaring sound or see a funnel cloud, swirling debris near the ground, flying debris, or any threatening weather approaching, take cover immediately. When out on the water, be prepared for severe weather. If threatening weather approaches make for shore and take shelter immediately. It is particularly dangerous to be on a small craft on the open water when lightning is occurring.
https://weather.gc.ca/layer:EC-MSC-SMC:1.0:Alert_Typewatchlayer:EC-MSC-SMC:1.0:Broadcast_Intrusivenolayer:SOREM:1.0:Broadcast_ImmediatelyNolayer:EC-MSC-SMC:1.1:Parent_URImsc/alert/environment/hazard/alert-3.0-ascii/consolidated-xml-2.0/20260903200021570/WH_13_73_CWTO/TRV/2000215701363533276202609030503_WH_13_73_CWTO/actual/en_proper_complete_u-fr_proper_complete_c/NinJolayer:EC-MSC-SMC:1.1:CAP_countA:23508 M:120889 C:139900profile:CAP-CP:0.4:MinorChangetextlayer:EC-MSC-SMC:1.0:Alert_Location_Statusactivelayer:EC-MSC-SMC:1.0:Alert_Nametornado watchlayer:EC-MSC-SMC:1.0:Alert_CoverageCanadian portion of the Great Lakes and the Ontario portion of the St. Lawrence Riverlayer:EC-MSC-SMC:1.1:Designation_CodeWH_13_73_CWTOlayer:SOREM:2.0:WirelessImmediateNolayer:EC-MSC-SMC:1.1:Alert_Location_Statusactivelayer:EC-MSC-SMC:1.1:Newly_Active_Areas002310layer:EC-MSC-SMC:1.1:Event_End_Time2026-09-04T01:00:00.000ZLake St. Clair42.5527,-82.5993 42.5558,-82.5959 42.574,-82.5753 42.5798,-82.5688 42.5947,-82.5519 42.6139,-82.5225 42.6123,-82.5199 42.6113,-82.5182 42.6108,-82.5175 42.6095,-82.5154 42.5628,-82.5505 42.5505,-82.5386 42.5262,-82.515 42.5358,-82.4634 42.5188,-82.3954 42.3937,-82.3695 42.2795,-82.4137 42.2849,-82.5491 42.2679,-82.7164 42.3254,-82.9097 42.3377,-82.9189 42.3422,-82.9211 42.3485,-82.9249 42.3512,-82.9263 42.3586,-82.9303 42.3828,-82.8374 42.5447,-82.6736 42.5632,-82.6314 42.5592,-82.6191 42.5555,-82.6079 42.5527,-82.5993layer:EC-MSC-SMC:1.0:CLC002310profile:CAP-CP:Location:0.33536020profile:CAP-CP:Location:0.33537048profile:CAP-CP:Location:0.33537064profile:CAP-CP:Location:0.33538004fr-CAMettornadeMonitorExpectedModerateLikelygrand publicprofile:CAP-CP:Event:0.4tornadoSAMETOA2026-09-03T20:00:21-00:002026-09-03T20:00:00-00:002026-09-04T02:59:21-00:00Environnement Canadaveille de tornade en vigueur
Les conditions sont propices à la formation d'orages violents qui pourraient produire des tornades. Des vents forts, de la grosse grêle et de la forte pluie sont aussi possibles.
Une ligne d'orages violents sur le Michigan traversera le lac en fin d'après-midi et ce soir. Cette ligne a déjà produit des tornades.
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Les infrastructures, les habitations et l’environnement naturel risquent d’être gravement endommagés ou détruits.
Une veille de tornade est émise lorsque les conditions sont propices à la formation d’orages violents pouvant produire des tornades.
Veuillez continuer à surveiller les alertes et les prévisions émises par Environnement Canada. Pour plus d’information, écoutez la station radio de la Garde côtière canadienne ou Radiométéo.
En cas de tornade, ou si une alerte de tornade est en vigueur dans votre région : rentrez à l’intérieur, gagnez une pièce située à l’étage le plus bas, loin des murs extérieurs et des fenêtres, comme un sous-sol, une salle de bain, une cage d’escalier ou un placard intérieur. Quittez les maisons mobiles, les véhicules, les tentes, les remorques et autres abris temporaires ou autonomes, et gagnez un bâtiment solide si possible. En dernier recours, allongez-vous dans un endroit bas et protégez votre tête des débris volants. Soyez prêts à faire face à du temps violent. Si vous entendez un grondement ou si vous voyez un nuage en entonnoir, des débris tourbillonnants près du sol, des débris volants ou tout autre phénomène météorologique menaçant, mettez-vous immédiatement à l’abri. Lorsque vous êtes sur l’eau, soyez prêts à composer avec des conditions météorologiques menaçantes. Si du temps menaçant approche, gagnez le rivage et mettez-vous immédiatement à l’abri. Il est particulièrement dangereux de se trouver au large dans une petite embarcation lorsqu’il y a des éclairs.
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