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Open AccessArticle

An Exceptional Case of Freezing Rain in Bucharest (Romania)

1
National Institute of Research and Development for Optoelectronics INOE2000, Str. Atomiştilor 409, Măgurele, RO077125 Ilfov, Romania
2
Faculty of Electronics, Telecommunications and Information Technology, Politehnica University of Bucharest, Spl. Independentei 313, RO061071 Bucharest, Romania
3
Department of Physics, Politehnica University of Bucharest, Str. Spl. Independentei 313, RO060042 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(11), 673; https://doi.org/10.3390/atmos10110673
Received: 4 October 2019 / Revised: 29 October 2019 / Accepted: 30 October 2019 / Published: 1 November 2019
(This article belongs to the Special Issue Atmospheric Composition and Cloud Cover Observations)
A high-impact freezing rain event affected parts of southeastern Romania on 24–26 January 2019. The freezing rain caused extensive damages in Bucharest, the capital city of Romania. The meteorological analysis highlighted the presence of a particular synoptic pattern involving a high-pressure system advecting cold air mass at low levels, while at mid-levels a warm and humid intrusion was associated with a low-pressure system of Mediterranean origin. At Bucharest, the vertical profiles from ERA5 and radiosondes emphasized the presence of a thick warm layer between 1000–1400 m above the re-freezing layer close to the surface. A climatology of freezing rain events in Bucharest was built to understand the frequency and intensity of this phenomenon. On average, there were approximately 5 observations of freezing rain in Bucharest per year between 1980–2018. The number of consecutive freezing rain days was used as a proxy for the event severity. Moderate-duration events (2 consecutive days) represented 16 periods of all 59 non-overlapping freezing rain periods in Bucharest and long-duration events (3 consecutive days) represented 3 periods. The monthly distribution showed that freezing rain occurs more frequently between December–February with a maximum in December. The moderate and long-duration freezing rain events were associated with two main sub-synoptic patterns related to the Carpathians lee cyclogenesis. View Full-Text
Keywords: freezing rain; high-impact meteorological event; Carpathian lee cyclogenesis; climatology freezing rain; high-impact meteorological event; Carpathian lee cyclogenesis; climatology
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Andrei, S.; Antonescu, B.; Boldeanu, M.; Mărmureanu, L.; Marin, C.A.; Vasilescu, J.; Ene, D. An Exceptional Case of Freezing Rain in Bucharest (Romania). Atmosphere 2019, 10, 673.

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