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Discussed in the following Daily reports:
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1. Impact
In August south-western Europe had a strong heatwave, with many local records broken for both maximum and minimum temperature (see e.g https://meteofrance.com/actualites-et-dossiers/actualites/fortes-chaleurs-aout-2023). During this heatwave e.g Lyon in France saw 17 days in a row with above 30°C (9-25 August), and culminated with 41.4°C on 24 August . In Spain, Bilbao on the north-coast set a new record of 44.0°C on 23 August.
2. Description of the event
The plots below show analyses of z500 and T850 from 19 August to 25 August 00UTC, every 24 hour.
The plot below shows time-series of 2-metre temperature over south-eastern France for 2023 (red) and 2003 (grey).
3. Predictability
3.1 Data assimilation
3.2 HRES
The plot below shows radiosonde profile from Santander on 23 August 12UTC and the forecast from 20 August 00UTC.
The plot below shows the error (shade) in the ensemble mean z850 from 20 August 00UTC valid 23 August 12UTC. The forecast is in black contour and analysis in red contour.
3.3 ENS
The plots below show EFI and SOT for 3-day 2-metre temperature on 22-24 August. Geneva is marked with an hourglass.
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