This is in effect from 15:21 on Monday, 12 June 2023 until 19:00 on Monday, 12 June 2023.
What to expect
- Flooding of homes and businesses is likely and could happen quickly, with damage to some buildings from floodwater, lightning strikes, hail or strong winds
- Where flooding or lightning strikes occur, delays and some cancellations to train and bus services are likely
- Spray and sudden flooding probably leading to difficult driving conditions and some road closures
- Some communities likely to become temporarily cut off if roads flood
- Power cuts likely to occur and other services to some homes and businesses could be lost
A cluster or line of very active thunderstorms is moving towards the northwest from from Bedfordshire and Buckinghamshire towards the West Midlands. These will bring a period of exceptionally heavy rainfall with 30-40mm falling in around 30 minutes, perhaps around 60mm in an hour for some locations. Frequent lightning strikes, winds that may gust to 45 mph, and some large hail stones perhaps up to 4cm in diameter will also accompany the storms. Surface water flooding may happen very quickly, likely disrupting travel and flooding some properties (especially in urban areas). Lightning, strong winds and hail will all pose a significant danger to those outdoors. The ultimate northwestern extent of this area remains somewhat uncertain.
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