For the record, there has been only one occasion anywhere in the British Isles when more rain has fallen in as short a time (193mm in two hours at Walshaw Dean Reservoir, West Yorkshire, on 19 May 1989) and there is still some doubt as to the authenticity of that figure. And yet just 6km or so away from the storm centre in districts such as Kingsbury, Wembley, Acton, Fulham, Finsbury, the City of London, Hackney, and Walthamstow, there was almost no rain at all. A report carried out in 2011 by a firm of engineering consultants, Haycock, which reviewed the storm, confirmed that the total could have been as much as 200mm, when hail was properly factored in. The Society’s weather-recording station must have been close to the point of maximum rainfall, for the rain gauge there recorded 170.8mm of rain — something like three months’ worth of rain in considerably less than three hours. Cloudburst upon Hendraburnick Down: The Boscastle storm of 16 August 2004. Furthermore, it is probable that the Hampstead rain-gauge under-recorded the actual quantity of precipitation because many of the large hailstones that fell at the peak of the storm could have bounced out of the gauge’s funnel. The west Surrey thunderstorm of 13 August 2006. International Journal of Environmental Studies. Extreme Weather: Forty Years of the Tornado and Storm Research Organisation (TORRO). Meteorological Office, Bracknell. Use the link below to share a full-text version of this article with your friends and colleagues. Although the point of maximum rainfall was probably within a few hundred metres of the rain-gauge at Hampstead observatory, it is highly unlikely that the site of the gauge and the wettest spot coincided. 5: Quantitative precipitation forecasts. Aside the climate change bumf it does sensibly discuss the flooding problems that await London should one of these freak storms turn up again…and it will. Compared to Hampstead it was just ~40mm fell but it was impressive. The MetO report for the month makes interesting reading. Every time we get a really heavy downpour it floods the bottom of one street, although no houses are directly flooded everything starts backing up. New houses are not welcome here at least not without the infrastructure development – and there’s the nub. I was used to storms but remember this one going on and on. Wiley-Blackwell. Learn more. The past few years have been challenging. The storm was centred over Hampstead Heath and scarcely moved during the entire duration of its most intense phase. Four of London’s main-line railway stations were flooded and closed, a large part of the London Underground was brought to a standstill as tunnels were inundated and the electricity supply failed, and a Promenade concert in the Albert Hall, far distant in west London, was delayed by over an hour due to the late arrival of several orchestral players and the conductor (not to mention a substantial proportion of the audience). I used to live near the equator and once witnessed a record storm system that dropped over 500mm in 24 hours back in ’78. He threw a number of ice-cubes almost vertically into the rain-gauge funnel, and found that approximately 30 per cent of them jumped out again, and several others broke into fragments which scattered both in and out of the funnel. SHORT‐RANGE WEATHER FORECASTING — A CURRENT ASSESSMENT. It’s quite incredible to see how much destruction (of appartments, cars) can result from two hours of rain. 10.1002/(SICI)1097-0088(199605)16:5<585::AID-JOC24>3.0.CO;2-#, https://doi.org/10.1002/j.1477-8696.1976.tb04382.x, Editor's Choice of Classic papers from the Weather Backfile. Thankfully I missed the hail, but the lightening was unsettling. The rain was like sheets and the streets disappeared below pale brown rivers. The nearest deluge I’ve seen here was 3rd August 2004 when I got drenched through running 20 meters from the bus to shelter (Boscastle was later that month). We often hear claims of “1 in umpteen thousand year” events, but this case study rather puts such claims into perspective.
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