Storm overflow discharges surge to 105 across England and Wales amid heavy rain

Mason's ledger flagged 105 storm overflows discharging across England and Wales at an hour when the normal figure is 23 — more than four times the baseline. That reading does not stand alone: it comes during a spell of heavy rain and thunderstorms that the Met Office had already warned about, and which has produced confirmed flooding in the West Midlands, according to [1]. Two yellow thunderstorm warnings were in force for Thursday, one covering London and the South East until 8am, the other spanning Wales and much of England from 5am to 10pm, according to [1]. West Midlands Fire Service said it was called to "significant flooding" in Birmingham after a flood warning was issued for the Perry Barr area on Wednesday night because of rising river levels, with crews working alongside West Midlands Police and Birmingham City Council, according to [1]. Incidents were reported around Curbar Road, Thornbridge Avenue and Haddon Road, and the council urged people to avoid walking, cycling or driving through flood water, according to [1]. The Environment Agency had issued 22 flood alerts across the Midlands and South East, according to [1]. Met Office forecaster Craig Snell said some areas could see 50-75mm of rainfall on Thursday with lightning and hail, while parts of the wider warning area could get more than 75mm over 12 hours, according to [1]. The South East was forecast 30-40mm with hail up to 1-2cm, he said, according to [1]. This rainfall is landing on ground that had been extremely dry: the same report notes drought had been declared across nearly three-quarters of England and the whole of Wales after a run of hot weather, with the Met Office saying the UK was on course for its hottest summer on record and temperatures reaching 38.1C in London, according to [1]. Heavy rain falling on parched, hardened ground is a known driver of surface water flooding and can push more flow into sewer and drainage networks quickly — a plausible link to elevated overflow activity, though the reporting material does not itself discuss sewer or overflow infrastructure, so that connection is not confirmed by the sources. Separately, a regional Met Office forecast for Wales describes a change to a more unsettled, showery pattern driven by a series of Atlantic low-pressure systems, with above-average rainfall likely in the west and northwest over the following days, according to [2]. That outlook is broader and later-dated than the Birmingham flooding report and does not itself confirm the storm overflow figures or tie directly to the hour in question. What the material does not establish: there is no data here from water companies or the Environment Agency specifically on storm overflow discharges, so the 105-count reading cannot be independently corroborated or broken down by site in this reporting. The link between the heavy rain described in [1] and the overflow spike is consistent with the timing but not explicitly confirmed by any source. What to watch next: whether the Environment Agency or water companies publish overflow data confirming the spike and its locations, and whether the current rain band clears or is followed by the more unsettled pattern flagged for Wales in [2].