Environment Canada said conditions are favourable for the development of severe thunderstorms capable of causing strong wind gusts, large hail and heavy rain.

The notice covers both north and south Niagara.

The weather service said storms ahead of an approaching frontal trough will affect parts of the region this afternoon and notes some of the storms could be severe.

The service also notes that severe thunderstorms can produce tornadoes. Already, Hamilton and surrounding areas towards Halton are under a tornado watch – which means conditions could lead to such wind storms. A warning means that outcome is likely.