by EFAS Meteorological Data Collection Centre,

November 2021 was characterized by lower than normal sea surface pressure over the majority of the land area in the EFAS domain and above normal sea surface pressure over the Atlantic Ocean between the Azores and Iceland.

At the beginning of November, a strong low-pressure system was located over Great Britain and Ireland. An upper-level low-pressure system was situated over southeast Europe. The remaining parts of the EFAS domain were influenced by high-pressure systems. The upper-level low-pressure system merged with the trough associated with the low-pressure system over Great Britain and Ireland, while this low-pressure system was weakening and moving to the Norwegian sea. The western parts of the trough expanded towards the Iberian Peninsula. Heavy precipitation occurred along the eastern edge of the trough, for example in Bosnia-Herzegovina. The trough was cut-off over the western Mediterranean region on 5 November and developed further to medicane ‘Blas’. ‘Blas’ remained active until 18 November and brought in this period heavy precipitation, severe weather, strong winds, floods and landslides at many locations in this region. During this period, a high-pressure system moved to the Bay of Biscay and a low-pressure system from Iceland to northern Scandinavia. As the high-pressure system moved to eastern Europe, a high-pressure ridge formed from the Azores to eastern Europe, trapping ‘Blas’ together with the high pressure over northern Africa. A low-pressure system moved from the Atlantic Ocean to Great Britain and Ireland and dissipated there. The high-pressure ridge extended further northward and blocked the low-pressure systems located over the Atlantic. While a new high-pressure system developed in the ridge over western Europe, a low-pressure system moved from Iceland to northern Scandinavia, and later to northwest Russia. The corresponding trough extended to the Iberian Peninsula and an upper-level low-pressure system was cut-off. It caused once again heavy precipitation in the western and central Mediterranean regions. The above-mentioned high-pressure system moved further towards the Atlantic Ocean. Consequently, low-pressure systems developed over Scandinavia and east of Iceland. One of these systems moved in the last days of November via Great Britain and Ireland to central Europe and later further to eastern Europe. By the end of the month, the Azores high was around its usual position. Weak low-pressure systems were located over the Norwegian Sea, as well as over Great Britain and Ireland. A strong low-pressure system was situated over northwest Russia.

*Currently, we cannot provide maps for November Meteorological Situation due to missing meteorological observations caused by an IT security incident at the Meteorological Data Collection Center.