Hong Kong Observatory cancels amber rainstorm warning

Hong Kong's weather authority lifts amber rainstorm alert after severe thunderstorm threat prompts warnings of hail and violent gusts. | Contesto: cronaca

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• Hong Kong Observatory cancels amber rainstorm warning

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The Hong Kong Observatory cancelled an amber rainstorm warning at approximately 7:05 p.m. on Friday, ending a two-and-a-half-hour alert for the city. The forecaster had initially issued the warning at 4:35 p.m., urging residents to prepare for severe weather conditions, including the potential for hail and violent gusts as a band of intense thunderstorms moved across the region. The cancellation signaled that the immediate heavy rain threat had diminished, though unsettled conditions were expected to persist through the evening. Prior to the rainstorm alert, the Observatory had escalated its advisories throughout the afternoon. Less than an hour before the amber signal, it issued several special weather bulletins highlighting the rapid development of severe thunderstorms. These storms were characterized by intense rainfall rates and the possibility of sudden, damaging wind gusts. The preemptive warnings are part of a standard protocol to give the public, particularly those outdoors or in flood-prone areas, crucial lead time to seek shelter and secure property. The amber warning represents the lowest level in the Observatory's three-tiered rainstorm warning system, which also includes red and black signals denoting progressively more severe and widespread rainfall. An amber warning indicates that heavy rain has fallen or is expected to fall generally over Hong Kong, exceeding 30 millimetres in an hour, and is likely to continue. It serves as a caution for potential traffic disruptions and minor flooding, especially in low-lying regions. The decision to issue, and subsequently cancel, such warnings is based on real-time radar data, rainfall measurements, and predictive modelling of storm cells. Friday's weather event is consistent with the volatile spring and summer weather patterns typical of southern China. The region is frequently affected by troughs of low pressure and shear lines that can trigger convective activity, leading to sudden thunderstorms with little warning. These systems can develop rapidly over the Pearl River Delta, making precise short-term forecasting a critical public safety function. The Observatory's layered warning system is designed to...

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Categoria: cronaca