A Heat Warning has been issued for all of Perth County as well as all of Lambton County.
Hot and humid conditions are expected for the day with daytime highs in the high 20s or low 30s.
Combine those temperatures with high humidity for temperatures feeling like near the 40s.
Overnight lows of above 20 degrees will provide little relief.
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A Severe Thunderstorm Watch is in affect for all of Huron, Lambton and Perth Counties.
Conditions are favourable for the development of dangerous thunderstorms that may be capable of producing strong wind gusts and torrential rain.
Remember when thunder roars go indoors!