Forecasters have issued warnings for thunderstorms and heavy rain on Sunday, affecting a large portion of eastern Wales and most of England.
As a result, the Met Office reports that there is a “small chance of flooding and disruption” in certain locations.
Starting at 04:00 BST, a yellow warning that advises people to “be aware” will be in effect for wide portions of southern England, the Midlands, and the north.
Forecasters warn that on Sunday morning, thunderstorms and a lot of rain are expected to start in the south of England and move northward over the day.
The warning covers a region in central England that stretches from the Isle of Wight to Newcastle upon Tyne.
The eastern counties of Wales—Monmouthshire, Newport, Torfaen, and Wrexham—are under alert.
While acknowledging that “frequent lightning strikes and hail will be additional hazards” across southern and central England, the Met Office noted that there is a chance of flooding.
The “extent of these thunderstorms is very uncertain, and many places will miss them,” the forecaster cautioned, nevertheless.
A thunderstorm warning with the possibility of “frequent lightning strikes and hail” has been issued for a significant portion of Wales and England.
The Met Office has issued a yellow thunderstorm warning for Sunday, which is in place from 4am to 9pm and covers the Isle of Wight to the Scottish border. Cardiff is expected to be impacted, along with the western regions of Wales.
“Thereafter, the risk of storms will gradually shift broadly northward through the afternoon and into the early evening,” the statement continued.
“Where these thunderstorms do form, 30 to 40 mm of rain may fall in less than an hour, with maybe over 75 mm in one or two spots, increasing the risk of flooding and disruption. However, the extent of these thunderstorms is quite unpredictable, and many places will miss them.
“Frequent lightning strikes and hail will be additional hazards, most likely across southern and central England.”