The role of the Italian scientific community in the first HyMeX SOP: an outstanding multidisciplinary experience

Davolio, Silvio; Ferretti, Rossella; Baldini, Luca; Casaioli, M.; Cimini, Domenico; Ferrario, Massimo Enrico; Gentile, Sabrina; Loglisci, Nicola; Maiello, Ida; Manzato, Agostino; Mariani, S.; Marsigli, Chiara; Marzano, Frank S.; Miglietta, Mario Marcello; Montani, A.; Panegrossi, Giulia; Pasi, Francesco; Pichelli, Emanuela; Pucillo, Arturo; Zinzi, A.

doi:10.1127/metz/2015/0624

Cited by 13 publications

(12 citation statements)

References 17 publications

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“…No special observations, except for some additional soundings, were available over the NEI area for IOP18 and IOP19 events. However, it is worth mentioning that the unprecedented collaboration fostered by the HyMeX‐SOP1 among research institutions and regional meteorological centres and agencies (Davolio et al , ) allowed a fruitful collaboration and sharing of observation databases (national radar composite and rain‐gauge network, among others). For the sake of brevity, only the comparisons concerning the total precipitation are presented.…”

Section: Model Descriptionsupporting

confidence: 71%

“…The steep and complex orography of the Alpine area makes floods a common hazard during autumn. Autumn 2012 was no exception in this regard: several intense precipitation episodes affected NEI, which turned out to be the rainiest area of the campaign (Davolio et al , ). More than 1000 mm of rainfall were recorded over the Alps of the Friuli Venezia Giulia (FVG) region (see Figure for the location) during the two‐month period of SOP1, locally exceeding climatological values for this time of year.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms producing different precipitation patterns over north‐eastern Italy: insights from HyMeX‐SOP1 and previous events

Davolio

Volonté

Manzato³

et al. 2016

Quart J Royal Meteoro Soc

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During the first HyMeX Special Observation Period (SOP1) field campaign, the target site of north‐eastern Italy (NEI) experienced a large amount of precipitation, locally exceeding the climatological values and distributed among several heavy‐rainfall episodes. In particular, two events that occurred during the last period of the campaign drew our attention. These events had common large‐scale patterns and a similar mesoscale setting, characterised by southerly low‐level flow interacting with the Alpine orography, but the precipitation distribution was very different. During Intensive Observing Period IOP18 (31 October–1 November 2012), convective systems were responsible for intense rainfall mainly located over a flat area of the eastern Po Valley, well upstream of the orography. Conversely, during IOP19 (4/5 November 2012), heavy precipitation affected only the Alpine area. In addition to IOP18 and IOP19, the present study analyses other heavy‐precipitation episodes that display similar characteristics and which occurred over NEI during the autumn of recent years. A high‐resolution (2 km grid spacing) non‐hydrostatic NWP model and available observations are used for this purpose. The two different observed precipitation patterns are explained in terms of interaction between the impinging flow and the Alps. Depending on the thermodynamic profile, convection can be triggered when the impinging flow is forced to rise over a pre‐existing cold‐air layer at the base of the orography. In this situation a persistent blocked‐flow condition and upstream convergence are responsible for heavy rain localized over the plain. Conversely, if convection does not develop, flow‐over conditions are established and heavy rain affects the Alps. Numerical parameters proposed in the literature are used to support the analysis. Finally, the role of evaporative cooling beneath the convective systems is evaluated. It turns out that the stationarity of the systems upstream of the Alps is mainly attributable to persistent blocked‐flow conditions, while convective outflow slightly modifies the location of precipitation.

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Section: Model Descriptionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Mechanisms producing different precipitation patterns over north‐eastern Italy: insights from HyMeX‐SOP1 and previous events

Davolio

Volonté

Manzato³

et al. 2016

Quart J Royal Meteoro Soc

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“…In HyMeX special emphasis is given to the topics of the occurrence of heavy precipitation and floods, and their societal impacts, which were the subjects of the SOP1. One of the products of the HyMeX SOP1 is a database of hourly precipitation available for 2944 raingauges over Italy belonging to the Italian DPC (Department of Civil Protection; Davolio et al, 2015). This database extends behind the period of the HyMeX SOP1 and contains all the events considered in this paper.…”

Section: Introductionmentioning

confidence: 99%

Improvement of RAMS precipitation forecast at the short-range through lightning data assimilation

Federico

Petracca

Panegrossi

et al. 2017

Nat. Hazards Earth Syst. Sci.

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Abstract. This study shows the application of a total lightning data assimilation technique to the RAMS (Regional Atmospheric Modeling System) forecast. The method, which can be used at high horizontal resolution, helps to initiate convection whenever flashes are observed by adding water vapour to the model grid column. The water vapour is added as a function of the flash rate, local temperature, and graupel mixing ratio. The methodology is set up to improve the shortterm (3 h) precipitation forecast and can be used in real-time forecasting applications. However, results are also presented for the daily precipitation for comparison with other studies.The methodology is applied to 20 cases that occurred in fall 2012, which were characterized by widespread convection and lightning activity. For these cases a detailed dataset of hourly precipitation containing thousands of rain gauges over Italy, which is the target area of this study, is available through the HyMeX (HYdrological cycle in the Mediterranean Experiment) initiative. This dataset gives the unique opportunity to verify the precipitation forecast at the short range (3 h) and over a wide area (Italy).Results for the 27 October case study show how the methodology works and its positive impact on the 3 h precipitation forecast. In particular, the model represents better convection over the sea using the lightning data assimilation and, when convection is advected over the land, the precipitation forecast improves over the land. It is also shown that the precise location of convection by lightning data assimilation improves the precipitation forecast at fine scales (meso-β).The application of the methodology to 20 cases gives a statistically robust evaluation of the impact of the total lightning data assimilation on the model performance. Results show an improvement of all statistical scores, with the exception of the bias. The probability of detection (POD) increases by 3-5 % for the 3 h forecast and by more than 5 % for daily precipitation, depending on the precipitation threshold considered.Score differences between simulations with or without data assimilation are significant at 95 % level for most scores and thresholds considered, showing the positive and statistically robust impact of the lightning data assimilation on the precipitation forecast.

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“…2, highlighting the large Italian community effort for the field campaign in terms of coordination and logistics. The paper by Davolio et al (2014) describes the organizational efforts and activities of the Italian scientific and operational communities at the Virtual Operational Center, hosted by CETEMPS in L'Aquila during the HyMeX SOP1 campaign, and the consequent impacts in the context of the peculiar organization of meteorology in Italy. The SOP1 IOPs are presented in Sect.…”

Section: Introductionmentioning

confidence: 99%

Overview of the first HyMeX Special Observation Period over Italy: observations and model results

Ferretti

Pichelli

Gentile

et al. 2014

Hydrol. Earth Syst. Sci.

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The role of the Italian scientific community in the first HyMeX SOP: an outstanding multidisciplinary experience

Cited by 13 publications

References 17 publications

Mechanisms producing different precipitation patterns over north‐eastern Italy: insights from HyMeX‐SOP1 and previous events

Mechanisms producing different precipitation patterns over north‐eastern Italy: insights from HyMeX‐SOP1 and previous events

Improvement of RAMS precipitation forecast at the short-range through lightning data assimilation

Overview of the first HyMeX Special Observation Period over Italy: observations and model results

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