A warning of heavy rain and possible hail as well as thunderstorms in Devon has been issued by the Met Office.
Forecasters have issued a yellow warning of heavy showers and storms in the region today.
The warning is valid throughout the day from 12.15am.
A Met Office spokesman said: "Heavy showers and thunderstorms are likely to spread from the south across some southern and western parts of England, and also Wales, on Thursday night - the risk then continuing through much of Friday.
"Many places will miss these but the public should be aware of the potential for isolated disruption due to surface water flooding, lightning strikes and hail.
"A warm and humid airmass covers southern Britain at present. This is already becoming increasingly unstable and producing a few thunderstorms through Thursday, but these are expected to become more widespread overnight into Friday and extend further north into the Midlands and Wales."
20-30mm rain may fall in a short time, leading to some surface water flooding, whilst lightning and hail may be additional hazards.
