UK Thunderstorms Bring Flash Flood Risk as Heat Breaks
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- Met Office yellow thunderstorm warning covers northern England and north Wales until 10:00 BST Thursday, with 15-20mm of rain possible in an hour and 30-50mm within six hours.
- Low pressure has replaced the high-pressure pattern that dominated the summer, producing unstable air and storm clouds capable of torrential downpours, hail, and thunder that will drift south and east into Wales, the Midlands, East Anglia, and southern England.
- Flash flooding is possible where the ground has been hardened by the prolonged dry spell, and lightning and hail bring additional hazards within the warning area.
- RAC road safety spokesperson Rod Dennis warned that oil, fuel, and rubber deposits built up over the dry weeks will mix on wet roads, raising the risk of skidding, with flash floods adding danger in heavier rain.
- Experts caution that the UK drought will not end with this rainfall — sustained persistent rain is needed to replenish water stocks, and whether stocks have recovered won't be clear until late winter.
- Thursday is expected to be the first day since 29 June when temperatures fail to reach 25C anywhere in the UK, with highs of 13-23C; Friday night could drop to 3-4C in Scotland and northern England.
- Aultbea in the Scottish Highlands has recorded 389.6mm of rain this summer — more than 1.5x the seasonal norm and just 10.2mm short of its wettest summer on record.
Why it matters: The first sustained rainfall in months creates real flash-flood and road-safety risks where hardened ground and months of accumulated road grime meet sudden downpours, but water stocks will not recover without weeks of persistent rain — meaning the drought's end cannot be confirmed until late winter even if wet conditions continue.
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