urn:oid:2.49.0.1.124.3085318197.2026cap-pac@canada.ca2026-07-21T18:01:26-00:00ActualAlertEnv. 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/en-CAMetthunderstormMonitorExpectedModerateLikelygeneral publicprofile:CAP-CP:Event:0.4thunderstormSAMESVA2026-07-21T18:01:26-00:002026-07-21T17:55:00-00:002026-07-22T04:01:26-00:00Environment Canadayellow watch - severe thunderstorm - in effect
Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts, large hail and heavy rain.
Hazards:
Torrential downpours. Local rainfall amounts in excess of 50 mm.
Wind gusts of 90 to 110 km/h.
Quarter to ping pong ball size hail.
Timing:
Late this morning through early this evening.
Additional information:
The main hazards will be heavy rainfall and damaging wind gusts. Local rainfall amounts in excess of 50 mm may occur for areas that receive multiple thunderstorms. The greatest likelihood for damaging wind gusts is expected to be over southwestern Ontario. A few instances of large hail are possible.
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Local utility outages are possible. Damage to roofs, fences, branches or soft shelters is possible.
Heavy rain can cause flash flooding and significant reductions to visibility.
Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on social media using #QCStorm.
When thunder roars, go indoors! Lightning kills and injures Canadians every year.
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Les conditions sont propices à la formation d'orages violents pouvant produire des rafales fortes, de la grêle de grosse taille et de la pluie forte.
Dangers :
Pluies torrentielles. Plus de 50 mm de pluie par endroits.
Rafales de 90 à 110 km/h.
Grêle allant de la taille d'une pièce de 25 cents à celle d'une balle de ping pong.
Période :
Tard ce matin et jusque tôt ce soir.
Renseignements supplémentaires :
Les principaux dangers associés à ces orages seront de la pluie forte et des rafales destructrices. Il pourrait tomber plus de 50 mm de pluie par endroits dans les zones touchées par plusieurs orages. Les rafales destructrices toucheront le plus probablement le sud-ouest de l'Ontario. Quelques épisodes de grosse grêle sont possibles.
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Des pannes de courant sont possibles par endroits. Des dommages aux toits, aux clôtures, aux branches ou aux abris souples sont possibles.
Les fortes pluies peuvent causer des crues soudaines et réduire considérablement la visibilité.
Veuillez continuer à surveiller les alertes et les prévisions émises par Environnement Canada. Pour signaler du temps violent, envoyez un courriel à meteoON@ec.gc.ca ou publiez un message sur les réseaux sociaux en utilisant #meteoqc.
Quand le tonnerre gronde, rentrez vite! La foudre tue et blesse des Canadiens chaque année.
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