Over half a months worth of rainfall is expected as the Met Office predicts that up to 40mm could fall during Tuesday morning.
The region has been warned to expect heavy rain and thunderstorms through Monday.
The Met Office has placed the region on yellow severe weather thunderstorm warnings.
Merseyside has been placed on yellow weather warnings for thunderstorms until 10pm Sunday night as further heavy thundery downpours could be expected.
The Met Office has placed parts of Merseyside on a yellow weather warning for thunderstorms.
Cooler air will settle in over the country by the weekend, bringing fresher winds and thunderstorms
The Met Office have recently introduced two types of weather warnings for Thunderstorms and lightning.
Merseyside has today been issued another weather warning for thunderstorms and torrential downpours.
After a stunning Bank Holiday Monday when temperatures reached 25C, Merseyside is to enjoy another day of scorching sunshine on Tuesday.
The Met Office has issued Merseyside a yellow severe weather warning for heavy rain.