Severe Thunderstorm Watch for Southern Ontario

This alert expired on Jul 10, 2013 10:50 PM EDT
Environment Canada
Alert area: City of Toronto; Windsor - Leamington - Essex County; Chatham-Kent - Rondeau Park; Sarnia - Petrolia - Western Lambton County; Watford - Pinery Park - Eastern Lambton County; Rodney - Shedden - Western Elgin County; St. Thomas - Aylmer - Eastern Elgin County; Strathroy - Komoka - Western Middlesex County; London - Parkhill - Eastern Middlesex County; Simcoe - Delhi - Norfolk; Dunnville - Caledonia - Haldimand; Woodstock - Tillsonburg - Oxford County; Brantford - County of Brant; Niagara Falls - Welland - Southern Niagara Region; St. Catharines - Grimsby - Northern Niagara Region; City of Hamilton; Burlington - Oakville; Halton Hills - Milton; Mississauga - Brampton; Caledon; Vaughan - Richmond Hill - Markham; Newmarket - Georgina - Northern York Region; Pickering - Oshawa - Southern Durham Region; Uxbridge - Beaverton - Northern Durham Region; Goderich - Bluewater - Southern Huron County; Wingham - Blyth - Northern Huron County; Stratford - Mitchell - Southern Perth County; Listowel - Milverton - Northern Perth County; Kitchener - Cambridge - Region of Waterloo; Guelph - Erin - Southern Wellington County; Mount Forest - Arthur - Northern Wellington County; Orangeville - Grand Valley - Southern Dufferin County; Shelburne - Mansfield - Northern Dufferin County; Innisfil - New Tecumseth - Angus; Saugeen Shores - Kincardine - Southern Bruce County; Hanover - Dundalk - Southern Grey County; Barrie - Collingwood - Hillsdale; Midland - Coldwater - Orr Lake; Orillia - Lagoon City - Washago; Cobourg - Colborne - Western Northumberland County; Belleville - Quinte West - Eastern Northumberland County; Picton - Sandbanks Park; Napanee - Consecon; Kingston - Odessa - Frontenac Islands; Lindsay - Southern Kawartha Lakes; Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes; Peterborough City - Lakefield - Southern Peterborough County; Apsley - Woodview - Northern Peterborough County; Stirling - Tweed - Madoc; Tamworth - Sydenham - South Frontenac; Kaladar - Bannockburn - Bon Echo Park; Bancroft - Hastings Highlands - Denbigh; Gananoque - Mallorytown; Brockville - Prescott; Westport - Charleston Lake; Merrickville-Wolford - Kemptville; Ottawa North - Kanata - Orléans; Ottawa South - Richmond - Metcalfe; Gatineau; Prescott and Russell; Morrisburg - Long Sault; Cornwall - Lancaster; Winchester - Newington; Maxville - Alexandria; Plevna - Sharbot Lake - Western Lanark County; Smiths Falls - Perth - Eastern Lanark County; Port Carling - Port Severn; Bracebridge - Gravenhurst; Town of Parry Sound - Rosseau - Killbear Park; Huntsville - Baysville; Haliburton - Minden - Southern Haliburton County; Oxtongue Lake - Fort Irwin - Northern Haliburton County; Barry's Bay - Killaloe; Renfrew - Arnprior - Calabogie; Petawawa - Pembroke - Cobden; Western Algonquin Park - Lake of Two Rivers; Deep River - Whitney - Eastern Algonquin Park; Owen Sound - Blue Mountains - Northern Grey County

Posted Jul 10, 2013 10:50 AM EDT

Potential for severe thunderstorms this afternoon and evening along a cold front.

This is an alert to the potential development of severe thunderstorms with large hail, damaging winds or heavy rainfall..Monitor weather conditions and listen for updated bulletins.

A cold front will cross Southern Ontario from west to east this afternoon and evening. Conditions ahead of and along the front will be favourable for the development of severe thunderstorms. Wind gusts to 90 km/h are possible with these storms, as well as hail 2 cm in diameter and heavy downpours up to 50 mm in an hour.

The front will affect Southwestern Ontario early this afternoon, the Greater Toronto area and South Central Ontario by mid afternoon, and Eastern Ontario late this afternoon and early this evening.

Environment Canada is closely monitoring this situation and will issue further watches and warnings as necessary.

Recommended actions

Please monitor for further updates to this alert.

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