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Natural Hazards

, Volume 97, Issue 2, pp 861–889 | Cite as

Nowcasting and real-time monitoring of heavy rainfall events inducing flash-floods: an application to Phlegraean area (Central-Southern Italy)

  • Alberto Fortelli
  • Nicola ScafettaEmail author
  • Adriano Mazzarella
Original Paper
  • 77 Downloads

Abstract

Severe weather events cause considerable disruptions to social and economic activities. Thus, high-precision meteorological products and services should be provided in order to forecast high-impacting weather conditions a few hours in advance such as those causing flash-floods. Today, this goal is mainly fulfilled by nowcasting. However, to fully comprehend alluvial phenomena, it is necessary to analyze not only the ground hydrological aspects but also the atmospheric dynamics leading to heavy precipitating events whose territorial distribution is generally complex. Herein, we analyzed the evolution of two convective storms which occurred on September 7 and 11, 2017, in the Phlegraean area (close to Naples) and explain why the first one, but not the second one, led to a flash-flood in Bacoli and Pozzuoli. We found that the traditional forecasting techniques failed since the severity of the two storms, in particular that of the first one, was not correctly forecast by Limited Area Models (LAMs). Using rainfall data, we demonstrate that LAM failed because it did not take into account the meteorological phenomenon enhancement occurring in the Phlegraean area when storms come from south-west due to the presence of Mt. Epomeo (789 m) on the nearby island of Ischia. In fact, this mountain has a quasi-pyramidal shape and is located at just 15–20 km south-west of the Phlegraean area. Thus, short/very-short time forecasting and nowcasting methodologies are not fully satisfactory. On the contrary, real-time rain-gauge monitoring networks are necessary to achieve high-safety levels in areas subject to flash-flood hazards and to promptly alert the population.

Keywords

Flash-floods Orographic rain enhancement Nowcasting Real-time rainfall monitoring 

Notes

Acknowledgements

We acknowledge CNR-IAMC for providing meteorological data of Bacoli and Capo Posillipo stations, DICEA (Department of Civil, Edil and Environmental Engineering) for providing data of NA Fuorigrotta 1 2, DiSTAR (Department of Earth, Environment and Resources Sciences) for providing data of Meteorological Observatory (San Marcellino) and Capodimonte, Campania Region (Centro Funzionale Multirischi di Protezione Civile - Direzione Generale per il Governo del Territorio, i Lavori Pubblici e la Protezione Civile) for providing data of Pozzuoli and Mt. Epomeo, www.campanialive.it meteorological network for providing data of Agnano Solfatara and NA Rione Alto, EuMetSat/Met Office, www.blitzortung.org.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Earth Sciences, Environment and GeoresourcesUniversity of Naples Federico IIMonte Sant’Angelo, NaplesItaly

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