UK Weather: Met Office Issues Yellow Weather Warnings for Storms and Flooding
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Yellow weather warnings have been issued by the Met Office as heavy rain and thunderstorms are forecast to hit parts of the UK later this week. Covering Wednesday and Thursday, the warnings include areas such as east Wales, the Midlands, northern England, East Anglia, and southern England—including London.
This could be one of the most widespread instances of heavy rain in southern and central parts of the UK this summer, bringing relief to drought-plagued regions but also potential for flash flooding where the ground is too dry to absorb the downpours. Lightning, large hail, and gusty winds are also possible.
Thunderstorms to Fire Up on Wednesday Morning
The storms will originate from France as warm and humid air sets in from the south. Initially, light showers will reach Cornwall and the West Country on Tuesday evening, but heavier rain with thunder and lightning is expected later that night. The first band of heavy showers could hit the southeast coast around midnight, spreading to Greater London before moving northwards into the home counties and East Anglia.
The initial yellow weather warning will be in effect from 03:00 BST on Wednesday until 22:00 BST. Although not every location within the warning area will experience storms, flooding is possible in affected areas, with up to 20-30mm of rain expected in an hour or less, and up to 40-50mm in just a few hours.
Thunderstorm and Flood Threat Continues on Thursday
The rain, hail, and storms are expected to persist into Thursday. A second weather warning for thunderstorms will be in place from 06:00 BST until 22:00 BST. Some storms may move slowly across the Midlands, Wales, and Northern England, leading to further flash flooding. Many areas could see 20-30mm of rain in three hours, with up to 50mm possible in some locations. The Met Office notes that there's a small chance of significantly higher totals, especially in east-facing higher ground where more than 75mm could fall within 12 hours. Lightning will be frequent, and hail of around 1-2cm is expected.
Why Are Rain and Thunderstorms Difficult to Forecast?
Thunderstorms are notoriously unpredictable due to their rapid development and localized nature. Small variations in temperature, humidity, wind, and atmospheric instability can significantly impact whether a storm forms and where it moves. While forecast models can identify the risk of thunderstorms across wider areas, pinpointing the exact location and intensity remains challenging. Even small changes in location can make the difference between heavy rain with thunder and lightning or staying completely dry.