Advanced Method for Forecasting and Warning of Severe Convective Weather and Local-scale Hazards

Hurricane Ida ferociously affected many south-eastern and eastern parts of the United States, making it one of the strongest hurricanes in recent years. Advanced forecast and warning tool has been used to track the path of the ex-Hurricane, Ida, as it left New Orleans on its way towards the northeast, accurately predicting significant supercell development above New York City on September 01, 2021. This advanced method accurately detected the area with the highest possible level of convective instability with 24-h lead time and even Level 5, devised in the categorical outlooks legend of the system. Therefore, an extreme level implied a very high probability of the local-scale hazard occurring above the NYC. Cloud model output fields (updrafts and downdrafts, wind shear, near-surface convergence, the vertical component of relative vorticity) show the rapid development of a strong supercell storm with rotating updrafts and a mesocyclone. The characteristic hook-shaped echo signature visible in the reflectivity patterns indicates a signal for a highly precipitable (HP) supercell with the possibility of tornado initiation. Open boundary conditions represent a good basis for simulating a tornado that evolved from a supercell storm, initialized with initial data obtained from a real-time simulation in the period when the bow echo and tornado-like signature occurred. Тhe modeled results agree well with the observations

Feruginozna tjelešca u plućima gradskih pasa

The aim of the study was to assess health hazards induced by environmental exposure to asbestos using urban dogs as biological indicators. Samples of the lung tissue taken from 36 randomly chosen urban dogs were examined. In the group of dogs aged up to four years (n=15) ferruginous bodies were identified in only two. In the dogs older than four years (n=21) 17 were ferruginous body positive. According to Fisher\u27s exact test the difference between the two groups was significant (P<0,001). The presence of asbestos bodies in the lungs of dogs is considered to be evidence of serious contamination of urban areas with respirable mineral fibres. The more frequent presence of asbestos bodies in the lungs of the older dogs indicates long-term accumulation of mineral fibres exceeding 10 µm in length. Continuous environmental exposure of the city\u27s population to respirable mineral fibres may therefore pose a health risk.Uzorci pluća 36 slučajno izabranih gradskih pasa pretraženi su na prisutnost feruginoznih tjelešaca s namjerom da se procijeni da li izloženost vlaknatim organskim prašinama, uglavnom azbestu, iz gradskog okoliša, nosi opasnost za zdravlje. U skupini od 15 pasa do četir godine starosti, u dva su nađena feruginozna tjelešca. U drugoj skupini koja je sadržavala 21 psa starija od četiri godine, sedamnaest njih je imalo pozitivan nalaz. Prema Fisherovu egzaktnom testu postoji značajna statistička razlika (P<0.001) između dviju skupina životinja. Prisutnost azbestnih tjelešaca u plućima pasa svjedoči da su javne gradske površine yisoko kontaminirane vlaknatim mineralnim prašinama respirabilne veličine, uglavnom azbestom. Češći nalaz azbestnih tjelešaca u plućima starijih pasa upozorava na akumulaciju vlakana duljih od 10 cm tijekom duljeg vremena, a predvidive su i posljedice takve kontinuirane izloženosti vlaknatim mineralnim kontaminantima za zdravlje gradskog stanovništva

Nonlinear operators on graphs via stacks

International audienceWe consider a framework for nonlinear operators on functions evaluated on graphs via stacks of level sets. We investigate a family of transformations on functions evaluated on graph which includes adaptive flat and non-flat erosions and dilations in the sense of mathematical morphology. Additionally, the connection to mean motion curvature on graphs is noted. Proposed operators are illustrated in the cases of functions on graphs, textured meshes and graphs of images