DOI: https://doi.org/10.5513/JCEA01/27.2.4961
Original scientific paper
Analysis of the cooling episode in Western Romania in the first half of April 2025 using upper troposphere maps
2026, 27 (2) p. 574-585
Vlad MIRCOV, Anca NICHITA, Veronica SĂRĂȚEANU, Daniela POȘTA, Otilia COTUNA, Călin SĂLCEANU, Mirela PARASCHIVU
Abstract
The first decade of April was characterised by particularly cold weather with minimum temperatures that were daily or even monthly records. The cooling of the weather occurred starting on April 6 and lasted until after April 10, producing late frost with dramatic effects for the farmers. The effects of the night frosts were disastrous for fruit and vegetable growing, as well as beekeeping. The study presents a comparative analysis of April 5 and 6 to capture the dynamics of the upper atmosphere involved in this strong late cooling process. The dynamics of the surface water were influenced significantly by the upper atmosphere; thus, understanding the maps improves the weather prediction models. The entrance regions of the jet streaks, isentropic lift, frontogenesis, and some degree of instability simultaneously determined an upward motion.
Keywords
late frosts, potential vorticity, relative vorticity, dynamic tropopause level, jet streak
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