Météo France has launched a new system called infradépartemental vigilance, designed to offer more accurate and localized weather alerts. This update, introduced on Tuesday, September 1st, allows for more detailed tracking of weather-related risks such as thunderstorms, heavy rain, flooding, snow, ice, and strong winds. Previously, weather alerts were displayed on a departmental level, with entire regions colored in green, yellow, orange, or red to indicate the severity of the risk. The new system allows for a more nuanced approach, where a single department can have multiple colors depending on the specific risk level in different areas, as long as the meteorological conditions justify such precision. The goal of this change is to better define risk zones at a more local level rather than applying the same alert to an entire department. This should help individuals more accurately determine whether their specific location is under an alert. While the heatwave alert is not currently affected by the new system, it could be integrated in the future. The improved precision is expected to be especially useful in areas like mountainous regions and coastal areas, where weather conditions can vary significantly from one location to another. The old system will remain visible by default on the Météo France website. However, users who click on an alert and select the type of alert will now see more detailed, localized information. Sébastien Brana, administrator of the Infoclimat website, noted that the new system will require more effort from forecasters, as it relies on high-resolution weather models. While these models allow for more detailed predictions, some uncertainty will remain, particularly with weather phenomena like tornadoes, which are difficult to predict with pinpoint accuracy. Overall, the new infradépartemental vigilance system represents a step forward in providing more targeted and precise weather alerts. It aims to improve public safety by helping people understand the specific risks in their immediate surroundings. While the transition may take time for users to fully adapt to, the potential benefits of more accurate, localized weather information are expected to be significant.