The heatwave in numbers

The University of Reading weather records, captured at the Atmospheric Observatory, are updated daily and are publicly available online. Temperatures and rain records go back to 1908, while the sunshine records start in 1956. Dr Rob Thompson in the Department of Meteorology has crunched the numbers to give his perspective on the current heatwave.

32           The 32-day period with no rain recorded at the University of Reading weather station this summer was the fifth longest on our record. This run, between 18 June and 19 July inclusive, ended when 0.5mm of rain fell on Friday 20 July. The outright Reading record for days with no rain observed is 37 days, which has occurred twice, in summer 1976 and summer into autumn 1959.

6.5          The tiny amount of rain that fell last week is nowhere near enough to help our gardens and the wider countryside, though. So what if we allow a little rain in a day and keep counting? The last recorded rain before Friday was on 17 June, when just 0.2mm fell, while 0.3mm fell the day before that. There was also 0.3mm on 9 June, 1mm on 7 June and 4.6mm on 3 June. This gives a June total of 6.5mm, making it the driest month since April 2011, and the driest June since 1962.

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Hottest ever Early May Bank Holiday among records broken in Reading

Records have been tumbling this year at the University of Reading’s weather station. Just days after the coldest March day since records began, a new record hottest recorded temperature was set for an April day. With the sun beating down on the UK over the Early May Bank Holiday weekend, the question was whether it could break yet more records. Stephen Burt from the Department of Meteorology explains.

Bank holiday weather is normally a cause for national despair, but not this last weekend I’m sure you’ll agree.

Monday was the warmest Early May Bank Holiday on record – and also the sunniest

Monday’s maximum of 27.6 °C (from the automatic weather station) made hotter than any previous Early May Bank Holiday day since the national holiday was introduced in 1978 – the previous highest temperature for the bank holiday weekend being 25.9 °C, set on the Saturday, 6 May, in 1990. It was also the warmest day in the month of May since 2005.

Additionally, unbroken sunshine on all three days this year – Saturday 14.2 hours, Sunday and Monday 14.1 each (total 42.4 hours) – recorded by the electronic sunshine sensor, made this by far our sunniest early Early May Bank Holiday ever.

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ECMWF symposium for Adrian Simmons

A Symposium for Adrian Simmons, ECMWF, Shinfield Road, Reading

Former University of Reading meteorologist and Visiting Professor, Adrian Simmons, is being honoured with a research symposium as he retires from his current role at the European Centre for Medium-Range Weather Forecasts this year.

Adrian has, over several years, contributed to numerical weather prediction and climate science in fields ranging from dynamic meteorology and numerical models to atmospheric composition and climate science.

Speakers at the symposium will cover topics such as Adrian’s early academic career (Brian Hoskins) as well as his contributions to numerical aspects and the spectral model (Michel Jarraud); supercomputing (Walter Zwieflhofer); data assimilation (Florence Rabier); climate reanalysis (David Burridge); the Global Climate Observing System (Carolin Richter) and the GEMS and MACC atmospheric composition projects (Vincent-Henri Peuch). The symposium will start at 14:00 and will be followed by a drinks reception at 17:30.

For further information and to register, please visit the symposium webpage:

https://www.ecmwf.int/en/learning/seminars/symposium-adrian-simmons

The symposium will be live streamed and access details will be available on the event page from 20 November.

Exploring the impact of drought on 2017 wheat crop

By Professor Donal O’Sullivan, Professor of Crop Science in the School of Agriculture, University of Reading

Unfavourable weather patterns and their impact on crop production have again been a major talking point in farming circles. Bizarrely, whilst the total amount of rainfall in 2017 to date is very close to the historic average, it has been distributed in a very unhelpful way (as data from the University’s Meteorology Department weather station helpfully plotted out in an up-to-the-minute annual graph shows).

Weather data from the University of Reading shows the drought in April and summer deluge

First and foremost, there was almost no meaningful rainfall for a six-week period spanning the calendar month of April, when crops were going through their most rapid phase of growth. But to compound matters, there was an unusual deluge in the second half of July, when dry conditions would have been more conducive to straightforward ripening and harvest.

Assessing the impact of this latest extreme weather episode was the subject of a BBC South Today news piece I contributed to on Tuesday evening. The research team I am leading in the School of Agriculture, Policy and Development may have some answers. We designed a large field experiment designed both to quantify yield losses due to drought and to detect varieties with drought-beating characteristics.

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Reading tops rainfall charts: But how does downpour compare historically?

By Dr Rob Thompson, Department of Meteorology, University of Reading

Whitley Wood Lane, South Reading, during heavy rain on 18 July 2017

Last night Reading experienced an immense thunderstorm, like something I’d previously only experienced in the tropics.

Driving conditions were horrendous, with incredibly reduced visibility and water simply unable to clear the roads quickly enough – I had the misfortune to be out in it.

To me, the rain was the impressive thing, but then my research is on rain, so I’m very aware of it. But to others the real experience was the lightning. There was a lot of lightning, both sheet and fork lightning. More than 100,000 strikes over the UK, you can see the strikes on the map below.

But, as I’ve said, the really impressive thing for me was the rain rate, and how sustained it was. Very high rainfall rates are not that uncommon, but lasting more than a few minutes is very unusual.

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The hottest heatwave since 1976? This is what the evidence says

By Stephen Burt, Department of Meteorology, University of Reading

There is much febrile comment in the media concerning the current heatwave. A common statement is ‘this is the greatest heatwave since the hot summer of 1976’.

Always a shame to spoil a good story with the truth, but that’s simply not true, and by a long way.

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Weather forecasters face storm of criticism – so is it time for a new look?

By Dr Andrew Charlton-Perez, Department of Meteorology, University of Reading

Former BBC weather forecaster Bill Giles’ criticism of weather forecasts raises questions about how weather is communicated generally.

Mr Giles has hit out at forecasters for regularly warning the public about the potential consequences of imminent severe weather, arguing they are ‘behaving like nannies’ and could cause the public to become ‘immune’ to the advice.

Rain in Reading – watch out for that puddle!

He added the practice of naming storms had become too frequent, and that forecasters should only advise people about potential dangers for ‘exceptionally severe weather’, which occurs once every few years.

But how much weather information is the right amount for the public? How much do they understand? Could an appreciation of the uncertainty of forecasts actually improve our faith in them?

Research at the University of Reading has shown that not only is the average person able to process more complex weather forecast information, they are likely to make better decisions as a result of the additional information.

Scientists at Reading have therefore begun looking at whether the way weather predictions are presented to the general public can be improved.

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‘Powering down’ of sun will shift aurora to the poles

What happens to the Earth when the Sun’s activity hits a 300-year low, as is predicted in the next few decades?

Research published this morning in Scientific Reports by Dr Mathew Owens and Professor Mike Lockwood has the answer. And if you enjoy the occasional visit of the beautiful Northern Lights to latitudes as low as Britain, then sorry – it’s bad news.

Matt Owens talked about the research in this 1-minute video:

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Shocking! Could an electric charge make clouds rain?

Clouds could be given a helpful jolt of electric charge to increase much-needed rainfall in dry parts of the world, thanks to an award-winning research proposal by scientists at the University of Reading.

The new study will investigate how charge modifies the growth of tiny water droplets into larger drops that fall as rain. It will use a supercomputer to simulate the cloud processes in detail, with specially developed robotic aircraft to sample and charge the clouds.

The Reading team was one of three groups awarded funding in this year’s US $5-million-dollar United Arab Emirates (UAE) Research Program for Rain Enhancement Science, at a ceremony in Abu Dhabi on Tuesday 17 January. Reading will receive US $1.5m.

The story has been given wide coverage in the region’s media. Read news story in ‘The National

 

Professor Giles Harrison is interviewed at the ceremony in Abu Dhabi

Giles Harrison, Professor of Atmospheric Physics at the University of Reading, said: “Our project is about changing the balance of charges on the tiniest cloud droplets, a neglected aspect of clouds which could revolutionise our ability to manipulate rainfall in areas that need it most.

“The UAE’s programme is ambitious and imaginative, and has already brought many international scientists together on this important topic.”

READ MORE on our News website >

The new research proposal was based on a study published in the Quarterly Journal of the Royal Meteorological Society in May 2015.

Record-breaking year when drought became flood

The Met Office confirmed this morning that 2012 was the wettest year on record for England, and the second wettest ever for the UK as a whole. Dr Roger Brugge, from the University of Reading’s Department of Meteorology, analyses the weather records from the University’s own climatalogical station during 2012.

2012 was a year in which precipitation and its impacts were uppermost in the minds of most people. With 821 mm of rain falling at the University of Reading, it was the wettest year since 2000 when 852 mm fell. The only other wetter years since 1917 at the university were in 1951 (when 896 mm fell), 1927 (858 mm) and 1960 (with 841 mm).

In Reading the year began with three dry months, with May also being on the dry side. Worthy of note in March were the 23rd and 24th (when 20.1°C was reached each day) and the 28th (when 21.4°C was recorded). The latter date came close to passing the highest March temperature on record at the University in 1965, when 22.8°C was recorded. Both January and March average 1 degC above normal – they were the only months of 2012 that could be said to be much warmer than normal.

April brought the imposition of hosepipe bans – whereupon it promptly turned wet with 120 mm of rain falling in the month, making it the wettest April locally since 2000. This was followed by a dry May – the eleventh dry month since the beginning of March 2011. With more days reaching 25°C in May than in any other May over the past 50 years hopes were beginning to build of a good summer, albeit with drought restrictions.

But it was not to be. June turned wet with 123 mm of rain falling, making it the wettest June in the town since 1971 with the longest rainless spell lasting just two days. In fact all the cloud in June made it duller than March. But at least by early July all hosepipe bans had been lifted.

July was quite cool and also wetter than average although August was slightly drier than normal. But, again, the perception was of a poor, dull summer. August, despite temperatures being close to average, was the sunniest month of 2012 (with 193 hours of sunshine) – meaning that 2012 was the first year locally since 1988 in which no month recorded 200 hours of sunshine. So maybe impressions were right?

September brought close to normal rainfall amounts, but the final three months of 2012 were wet – with local flooding, especially in December as rain continued to fall on saturated ground. With both October and December recording over 100 mm of rain (with 128 mm October was the wettest month of the year) Reading experienced four months in 2012 reaching this mark – the first time this has happened for at least 95 years.

Early December brought a hint of winter when the maximum temperature on the 12th being just -1.6°C, the coldest December day since 1991.

Overall, temperatures were slightly lower than normal (by 0.2 degC) making it the coldest year since 2010 (which was 0.7 degC colder). Sunshine totals came out at just above average – largely thanks to the sunny months of March and September.

  • Highlights of the weather in 2012:
  • 821 mm of rain made it the wettest year since 2000 when 852 mm fell.
  • The only other wetter years since 1917 at the university were in 1951 (896 mm), 1927 (858 mm) and 1960 (841 mm).
  • 21.4°C on 28 March was close to the highest March temperature on record at the University (22.8°C in 1965).
  • April was the wettest April locally since 2000.
  • May was the eleventh dry month since the beginning of March 2011.
  • June was the wettest June in the town since 1971. June was duller than March this year.
  • 2012 was the first year locally since 1988 in which no month recorded 200 hours of sunshine.
  • The final three months of 2012 were wet with local flooding.
  • There were four months during 2012 when over 100 mm of rain fell, the first time this has happened locally for at least 95 years.
  • The maximum temperature of -1.6°C on 12 December made this the coldest December day since 1991.
  • Overall, temperatures were slightly lower than normal (by 0.2 degC) making it the coldest year since 2010 (which was 0.7 degC colder).
  • Sunshine totals came out at just above average – largely thanks to the sunny months of March and September.

This summary of the weather of 2012, produced by Roger Brugge and Mike Stroud, is based on daily observations made at the University of Reading climatological station. For more details on the observations of 2012 contact r.brugge@reading.ac.uk.