/europe/france-italy-floods-storm-alex-october-2020./binaries/content/assets/metofficegovuk/pdf/weather/learn-about/uk-past-events/interesting/2020/2020_09_storm_alex_1.pdf.The impacts mentioned here come from the following sources: Impacts of storm Alex led to local storm and flood warnings, and were widely reported in press. The dry conditions over the UK in the months leading up to the event are covered in the ‘Precipitation’ and 'Soil moisture’ sections. The impact of storm Alex on river discharge across western Europe is covered in more detail in the ‘River discharge’ section. The dry state of the ground prior to the storm (most of the UK recorded below-average rainfall in September) and the steady character of the rainfall, with an absence of intense bands of rain, are likely to have played a mitigating role, according to the UK Met Office. However, despite the widespread heavy rain brought by storm Alex and subsequent fronts, flooding impacts were relatively limited in the UK. Large waves led to infrastructure damage and travel disruption along parts of the south coast, for example at Swanage. The exceptional conditions caused floods and power cuts, as well as road and rail disruption across the country. On 3 October 2020, the UK received on average (over the whole country) 31.7 mm of rain, making this the UK’s wettest day in a record that goes back to 1891. In the United Kingdom, parts of central southern England and eastern Scotland recorded totals of 100 mm or more in the first four days of the month and, on 3 October, many weather stations measured their wettest October day on record. Over northern Brittany and the Manche department (northeastern France), as well as in the Landes department (southwestern France), monthly rainfall totals were two to three times the normal amounts, and made October 2020 the wettest on record since 1959: 289.2 mm was recorded in Cavan, 307.8 mm in Bricquebec and 413.5 mm in Saint-Martin-de-Hinx. In the whole region, only 2015 had higher precipitation at this time of year (end of September, beginning of October) since measurements began in 1961. On 3 October, a one-day rainfall total of 571 mm was recorded in Mons and of 500 mm in Saint-Martin-Vésubie, which is the equivalent of more than three months of average October rainfall for these locations and was a new daily record for this province. Precipitation totals in southeastern France were almost as substantial as those recorded in Italy. ĭevastating flooding also occurred along the French Riviera. Several rivers in the northwest exceeded river flow danger levels, including the Sesia at Borgosesia and Palestro, the Po at Valenza, the Tanaro at Garessio and Farigliano, the Toce at Candoglia and the Roya in Ventimiglia, and in most cases this led to substantial flooding. The Liguria and Aosta Valley regions were also affected. The village of Sambughetto recorded 630 mm and Limone Piemonte recorded 580 mm of rain on 3 October. The Piedmont region in Italy recorded its highest rainfall totals since records began in 1951. The Roman bridge over the river Roya near the village of Fanghetto in Liguria was submerged and collapsed by the flood wave produced by the rains of early October. Data source: ECA&D/Météo-France/ARPA Piemonte. The inset shows the particularly affected Maritime Alps, where station Limone Piemonte (Piedmont) recorded 553 mm on 2 October. The larger circles identify stations where one-day precipitation records were broken during this event. Stations where daily precipitation associated with storm Alex exceeded 10 mm/day on 2–3 October 2020.
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