urn:oid:2.49.0.1.124.2590560171.2026cap-pac@canada.ca2026-05-18T00:40:35-00:00ActualUpdateEnv. 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 – April 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 initiative to introduce free-form polygons to represent the true threat area of a weather hazard is tentatively set for June 2026 deployment. Data changes will appear in CAP following this deployment, 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 – avril 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) l’initiative d’ECCC visant à introduire des polygones libres pour représenter la véritable zone de menace d’un danger météorologique devrait être déployée provisoirement en juin 2026. Des changements de données apparaîtront dans le PAC à la suite de ce déploiement, 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:2.49.0.1.124.0678649782.2026,2026-05-18T00:40:00-00:00en-CAMetsquallMonitorImmediateSevereLikelygeneral publicprofile:CAP-CP:Event:0.4squallSAMESVR2026-05-18T00:40:00-00:002026-05-18T00:39:00-00:002026-05-18T04:38:00-00:00Environment Canadasquall warning in effect
Squalls with wind gusts up to 35 knots and hail up to 2 centimetres are expected or occurring in the area.
Thunderstorms are moving northeast across Lake Huron at 30 knots.
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Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Mariners are advised to prepare for squalls. If underway, seek safe harbour immediately. Consider delaying or postponing travel in areas under the squall warning.
https://weather.gc.ca/layer:EC-MSC-SMC:1.0:Alert_Typewarninglayer: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-2.0/20260518004000167/WH_13_73_CWTO/SQW/4000167179492884202605180503_WH_13_73_CWTO/actual/en_proper_complete_u-fr_proper_complete_c/NinJolayer:EC-MSC-SMC:1.1:CAP_countA:18034 M:93326 C:105062profile:CAP-CP:0.4:MinorChangetextlayer:EC-MSC-SMC:1.0:Alert_Location_Statusactivelayer:EC-MSC-SMC:1.0:Alert_Namesquall warninglayer: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_Areas002412layer:EC-MSC-SMC:1.1:Event_End_Time2026-05-18T03:39:00.000ZSouthern Lake Huron43.0052,-82.3823 43.0113,-82.4137 43.5911,-82.1227 44.7096,-82.3729 44.7041,-81.2898 44.7035,-81.273 44.7061,-81.2189 44.5146,-81.2158 44.3362,-81.4092 44.0654,-81.6693 43.8003,-81.6417 43.4006,-81.6524 43.2738,-81.7126 43.1746,-81.9831 43.0488,-82.1082 43.0182,-82.2082 43.0052,-82.3823layer:EC-MSC-SMC:1.0:CLC002412profile:CAP-CP:Location:0.33538030profile:CAP-CP:Location:0.33538035profile:CAP-CP:Location:0.33538040profile:CAP-CP:Location:0.33538056profile:CAP-CP:Location:0.33540010profile:CAP-CP:Location:0.33540025profile:CAP-CP:Location:0.33540028profile:CAP-CP:Location:0.33540063profile:CAP-CP:Location:0.33541015profile:CAP-CP:Location:0.33541024profile:CAP-CP:Location:0.33541045profile:CAP-CP:Location:0.33541055profile:CAP-CP:Location:0.33541057fr-CAMetgrainsMonitorImmediateSevereLikelygrand publicprofile:CAP-CP:Event:0.4squallSAMESVR2026-05-18T00:40:00-00:002026-05-18T00:39:00-00:002026-05-18T04:38:00-00:00Environnement Canadaavertissement de grains en vigueur
Des grains accompagnés de rafales jusqu’à 35 noeuds et de grêle pouvant atteindre 2 centimètres sont attendus ou se produisent dans le secteur.
Les orages se déplacent vers le nord-est sur le lac Huron à 30 noeuds.
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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.
Les navigateurs devraient se préparer à affronter des grains. Si vous naviguez déjà, cherchez un havre immédiatement. Envisagez la possibilité de retarder ou de reporter les déplacements dans les secteurs visés par l’avertissement de grains.
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