Thunderstorms could hit from Wednesday morning, as cooler air clashes with the warm humid air.
— Simon King (@SimonOKing) June 20, 2017
Heavy rain could lead to torrential downpours, frequent lightning and even hail.
This could result in some disruption, more likely from late Wednesday afternoon, which may include sudden localised flooding of transport routes, homes and businesses.
Frequent lightning could also temporarily disrupt power supplies and many parts of the warning area may escape the worst of the weather completely.
— Met Office (@metoffice) June 20, 2017
The Met Office say: “Rain over northern England early on Wednesday may locally lead to 20 mm or 30 mm of rain falling in one or two hours.
“Thunderstorms developing from late Wednesday afternoon bring a greater threat of severe weather with associated torrential downpours giving as much as 30 mm or even possibly 40 mm in an hour in places.
“Note that areas of severe weather are not expected to occur at the same time across the whole warning area.
“Instead, the threat of heavy rain and thunder is initially confined to parts of northern England before the threat of severe weather becomes more extensive late Wednesday”.
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