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http://intra.ecmwf.int/daily/d/dreport/2015/07/01/sc/
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1. Impact
During the week 29 June to 5 July a heatwave affected western Europe, and several July temperature records were beaten, among them the UK July record when Heathrow measured 36.7C on 1 July.
http://www.bbc.co.uk/news/world-europe-33341325On 1 July, the July temperature record for UK was set at Heathrow with 36.7C.
http://www.bbc.co.uk/news/uk-england-33324881
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The plots below shows the evolution of z500 and t850 and analyses spanning from 26 June to 5 July. ..The plots show the ridge building up from the south-west bringing warm air from north-west Africa to Europe.
Gallery includeLabel ua_an sort comment title Analysis of z500 and t850
The next plot shows a Hovmuller diagram of v200 (the time-axis increases upwards). The a Rossby wave train is evident that might influenced the meridional flow over Europe around 1st July. On 26 July a cyclone developed east of U.S what also could have played a role of the development of the ridge over Europe.
The plots below plots before shows day 1 EFI values for 2-metre temperature. This shows the evolution of the heat-wave. The heatwave first affected western Europe and later in the week central Europe.
Gallery includeLabel efi_an sort comment title DAy 1 EFI for 2-metre temperature
3. Predictability
3.1 Data assimilation
The plot below shows the data assimilation increments from 26 June 12UTC. Over U.S we find significant increments that could have influenced the predictability of the ridge over Europe.
3.2 HRES
3.3 ENS
The plot below shows the EFI for the 110-day period starting on Monday 29 June. A large part of Western Europe was covered by very high EFI values.
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