Foehn Climatology and Index for Sofia 1993–2014

• DOI: 10.7546/crabs.2025.01.11
• Publication Date: 2025-01-29T13:02:25Z
• Authors: Krasimir Stoev; Anastasiya Stoycheva; Guergana Guerova

Foehn is an extreme weather event caused by high wind gusts and its forecasting still a challenge. The foehn in Bulgaria observed on the northern slopes of mountains. Sofia occurs after air mass passes over Vitosha Lulin days are selected using as criteria surface temperature, relative humidity direction. For period 1993–2014 there 136 days. 55.9% gust between 14 19 m/s corresponding to yellow Meteoalarm code, 14.7% with 20–29 (orange code), 1.5% 30 (red code). upper-air flow at mountain peak Cherni Vrah 47.4% from 202⁰ direction 36.8% 225⁰ Orange code 55.0% Vrah, while for red it 180⁰. vrah-Sofia Stability Index computed found have sensitivity foehn/no conditions. case studies 2010 show that decreased 20% start, increased up 29% foehn. manual circulation classification created 4 classes. class I Mediterranean cyclones passing Hungary, results 51.3, 65.0 100.0% yellow, orange respectively.