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Weak upper ridging covers Britain on Friday, while a disrupting upper trough slides past southern Ireland on Friday night. A moist low-level airmass persists, especially across East Anglia where dewpoints of 15-17C are likely. Diurnal heating could yield a couple hundred J/kg CAPE, with convection and heavy showers developing - especially near multiple low-level convergence zones. Due to warming aloft, convection will be restricted in depth, likely spreading out with showers quickly pulsing up and down. Lightning is rather unlikely but developing updrafts aiding vorticity stretching near convergence zones could once again result in a few funnel clouds. Slow-moving heavy downpours could result in some local surface water issues. Showers will slowly weaken later in the evening, but additional development may be possible overnight in northern/eastern England and offshore over the North Sea.

Overnight, outbreaks of rain will develop over the Celtic Sea and environs, affecting parts of southern Ireland into Wales, SW and Cen S England. There is the chance of an odd embedded lightning strike, most likely offshore to the southwest - but given saturated profiles and weak CAPE the risk overall is quite low.

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