Extremely hot weather in September 2016. September 6th – hottest day of the year
2016-09-07 (IPMA)
An anticyclone over the Iberian Peninsula and Northern Africa, extending vertically at various levels of the troposphere, with a South – North orientation, carried extremely hot air from the interior of Iberian Peninsula and Northern Africa with strong subsidence (descent) and very low wind speed.
These meteorological conditions led to strong increase of air temperature close to the ground, resulting in extremely high air temperature values, especially in the southwest region of the Iberian Peninsula.
On the 5th and 6th September very high mean temperature values were recorded in Portugal mainland. The 6th of September was the warmest day of the year so far, with a mean temperature of 29.2°C. This value topped the temperatures on the 7th and 8th August, with 28.6°C and 28.7°C, respectively.
On September 6th the mean value for maximum and minimum temperature, 38.6°C, 19.8°C, respectively, were also the highest recorded for the year.
In addition, on the 5th and 6th of September 73% of the meteorological weather stations (of a total of 82 stations), surpassed the previous maximum temperature values recorded: 17% on the 5th and 56% on the 6th. On the 6th of September, 24% of the meteorological weather stations surpassed the values recorded on the 5th.
It is worth mentioning that the values of minimum air temperature surpassed the previously recorded values at the meteorological weather stations of Vila Real, Guarda, Castelo Branco, Lisboa, Évora, Beja e Vila Real de Santo António.
Finally, an heat wave, beginning at the end of August or September 1st, occurred in great part of the North and Center regions and inner Alentejo.
Imagens associadas
Figura 2 -Previsão do modelo do ECMWF válida para 24h desde o dia 06 set. 2016 00UTC
Figura 3 - Evolução diária da média da temperatura do ar em Portugal continental, observada de 1 de agosto a 6 de setembro de 2016 (Tmax, Tmédia e Tmin designam, respetivamente, temperatura máxima, média e mínima)
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