Issued 2026-09-22 22:27:44
Valid: 22/09/2026 22:00 to 23/09/2026 23:59
A fairly potent upper level shortwave trough will move east across northern UK Wednesday morning, the trough containing air below -20C at 500 hPa, which will steepen lapse rates and provide forced ascent of warm and humid airmass advection (850 hPa theta-w of 14C+) ahead of surface cold front moving SE across England and Wales, which will in turn support isolated to scattered thunderstorm development amongst heavy rainfall along cold front moving east and southeast across far S of Scotland, N England, N Wales, N Midlands and Lincs. Localised flash-flooding and strong wind gusts are possible with any storms.
Issued by: Nick Finnis
Issued by the Netweather forecast team whenever there is a risk of storms or severe convective weather, these discussion based and in depth forecasts will highlight the areas at risk and give an in depth description of the risk and the factors surrounding it.
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