Brits are bracing themselves for a deluge today, as nearly a month's worth of rain is forecast to pummel parts of the UK in a matter of hours.
A yellow weather warning has been issued for the south-west of England and south Wales, where some areas can expect a whopping 60mm of rain to fall in just six to nine hours.
The Environment Agency has also sounded the alarm, issuing flood alerts and urging people to exercise caution throughout the day as it keeps a close eye on river levels.
The Met Office's warning paints a bleak picture for the day ahead.
They wrote: "Flooding of a few homes and businesses is possible... Some interruption to power supplies and other services is possible. Spray and flooding on roads probably making journey times longer... Bus and train services probably affected with journey times taking longer."
Plymouth, Devon, typically sees around 72mm of rain in an entire average September, but today it could get close to that monthly total with around 60mm expected. Southampton, also under the weather warning, averages 60mm of rain in a standard September, so the rain is likely to be particularly severe there today.
While there are local concerns about waterways near Southampton and the surrounding Hampshire area, the Environment Agency's official flood alerts are mainly focused on Devon. The River Axe area, specifically between Axminster and Axmouth, is expected to be vulnerable throughout Wednesday morning.
Flooding is also a risk further west alongside the River Plym and Tory Brook, in and around Plympton and Bickleigh.
According to the Environment Agency's website: "The rivers Plym and Tory Brook are expected to rise. Forecast levels suggest there could be flooding to low lying land and roads close to the rivers... Take care near the areas of concern and monitor your local weather conditions. We are monitoring river levels and have staff in the area checking for and clearing blockages."
The downpours could be thundery at times, including across Wales. Most of the UK will experience rain in the afternoon, albeit less heavy than the deluge expected along the south coast.
Rebekah Hicks, chief meteorologist at the Met Office, stated: "We're expecting a band of heavy rain and strong winds to move north-east through the first part of Wednesday, followed by heavy showers and the risk of thunderstorms. Some of these could bring hail and gusty winds, particularly in southern areas.
"Of course, the warning coincides with the first school run after the summer holidays for some, meaning a wet and potentially disruptive start to the day for many."
Coastal gales are expected for a while, particularly along English Channel coasts, the Met Office has warned. These could reach up to 50mph at the Kent and East Sussex coasts, although these areas are not currently under any weather warnings.