Just as Perth locals were preparing for another burst of summer heat, the Bureau of Meteorology says the next 24 hours could bring the possibility of a storm across parts of the metro area.

Residents are being urged to stay alert on Tuesday evening, with the BoM flagging a chance of thunderstorms as a surge of moisture pushes into the region..

Meteorologists say a weak but increasingly unstable airmass is moving over the southwest.

While conditions aren’t expected to support a full-scale severe storm, isolated pop-up thunderstorms may still develop — particularly late this afternoon and into the early evening.

The main risks include localised heavy rainfall, which may cause minor flash flooding in low-lying or poorly drained areas, and gusty winds that could exceed normal afternoon

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