Environment Canada says that a broad swath of southwestern Ontario could be drenched as a series of thunderstorms move through the region this evening.

It updated a special weather statement on Sunday evening, saying that many communities between Windsor and the Greater Toronto Area could see heavy rainfall in the hours ahead.

According to the statement, a series of showers and thunderstorms, associated with an incoming low-pressure system, will hit the region overnight, dumping anywhere from 15 to 30 millimetres on affected areas.

In some cases, the rainfall could be in the 30- to 50-millimetre range if an area is hit by multiple thunderstorms.

The incoming thunderstorms could bring wind gusts of up to 80 km/h, according to the statement.

The updated statement says the following parts of the province could be affected:

  • City of Toronto
  • Simcoe — Delhi — Norfolk
  • Dunnville — Caledonia — Haldimand
  • Niagara
  • City of Hamilton
  • Halton — Peel
  • York — Durham
  • Dufferin – Innisfil
  • Windsor — Essex — Chatham-Kent
  • Sarnia — Lambton
  • Elgin
  • London — Middlesex
  • Oxford — Brant
  • Huron — Perth
  • Waterloo — Wellington