The Hong Kong Observatory says it will issue a T1 between 6am and 9am on Monday as Tropical Cyclone Man-yi moves towards the territory. The storm is forecast to come within 800 kilometres of the city around midnight tonight, but is expected to weaken. However, windy conditions are likely by Tuesday, the observatory said, warning that some low-lying areas may see flooding. "There will be a spring tide in the next couple of days. The sea level will be particularly high during the high tide overnight. Under the combined effect of the northeast monsoon and Man-yi, the sea level will generally be about a further 0.3 metres above the spring tide at night on Monday and Tuesday. Minor flooding may occur in individual low-lying areas. Members of the public please take appropriate precautions," it said. The observatory added that depending on the storm's intensity and distance from the city, it may issue a higher warning signal on Monday night or early Tuesday.