Abstract
Abstract. A heavy precipitation event swept over Catalonia (NE Spain) on 8 March 2010, with a total amount that exceeded 100 mm locally and snowfall of more than 60 cm near the coast. Unusual for this region and at this time of the year, this snowfall event affected mainly the coastal region and was accompanied by thunderstorms and strong wind gusts in some areas. Most of the damage was due to "wet snow", a kind of snow that favours accretion on power lines and causes line-breaking and subsequent interruption of the electricity supply. This paper conducts an interdisciplinary analysis of the event to show its great societal impact and the role played by the recently developed social networks (it has been called the first "Snowfall 2.0"), as well to analyse the meteorological factors associated with the major damage, and to propose an indicator that could summarise them. With this aim, the paper introduces the event and its societal impact and compares it with other important snowfalls that have affected the Catalan coast, using the PRESSGAMA database. The second part of the paper shows the event's main meteorological features and analyses the near-surface atmospheric variables responsible for the major damage through the application of the SAFRAN (Système d'analyse fournissant des renseignements atmosphériques à la neige) mesoscale analysis, which, together with the proposed "wind, wet-snow index" (WWSI), allows to estimate the severity of the event. This snow storm provides further evidence of our vulnerability to natural hazards and highlights the importance of a multidisciplinary approach in analysing societal impact and the meteorological factors responsible for this kind of event.
Highlights
On 8 March 2010, a heavy snowfall swept over a large proportion of Catalonia (NE Iberian Peninsula)
The most affected areas were characterized by values of relative humidity near 100 %, surface temperatures between 0 and 2 ◦ C, and intense snowfalls accompanied by rainfall, which favoured the formation of wet snow
The risk of damage due to strong wind and wet snow has been estimated using a meteorological indicator of severity that we called “wind, wet-snow index” (WWSI)
Summary
On 8 March 2010, a heavy snowfall swept over a large proportion of Catalonia (NE Iberian Peninsula). This was mainly due to its exceptionality: the large amount of wet snow and precipitation and wind, as well as the fact that it affected the most densely populated city in Catalonia, Barcelona (nearly five million inhabitants in the metropolitan area) with 3 cm of snow near the sea and 20 cm at the Fabra Observatory (415 m a.s.l.) This event surpassed the threshold for consideration as a heavy rainfall event of 60 mm/24 h set by the MEDEX (Mediterranean Experiment) project (Homar et al, 2007), allowing application of the methodology developed in. Syntax Error (7026217): Dictionary key must be a name object eption: the 1964 event that is included due to having occurred in March)
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