Yellow Warning From Met Office

Between 03:00 Wed 21st and 06:00 Thu 22nd June 2017

Bouts of rain, heavy and thundery at times, will move in from the west to affect parts of southern Scotland and northern England from the early hours of Wednesday.
More extensive thunderstorms may then break out over a larger part of England and Wales from late Wednesday afternoon onwards into Wednesday night, leading to torrential downpours, frequent lightning and a chance of 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 in association with the heaviest rain may also temporarily disrupt power supplies.
However, many places will likely see little or no impacts. Indeed many parts of the warning area will see dry and sunny weather through much of the daytime on Wednesday.

Chief Forecaster's assessment
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

Another warning, so much for the last one, it didn't even water the lawn.

Between 16:00 Tue 27th and 09:00 Wed 28th

There is an increasing risk of heavy rain, with thunder possible, developing over southern England on Tuesday afternoon before spreading northwards during the evening and overnight. Many places will miss the worst of the rain, but there is a low likelihood of flooding of homes and businesses as well as disruption to transport.


Chief Forecaster's assessment

There is much uncertainty with the forecast for this period and some places could even stay dry. However, heavy and thundery rain could produce 20 to 30 mm rain in an hour and very locally 40 to 60 mm in 6 to 12 hours. Should this occur then some flooding is possible, especially across urban areas. Overnight rain should gradually start to ease and by early Wednesday morning may be confined to parts of the East Midlands and East Anglia