What does a white alert mean?

White warning: the weather warning is moderate rain, with 24-hour rainfall 10-25mm and 3-hour rainfall 15mm or less, which shall be reported 3 hours in advance. It is necessary to ensure that there is no stagnant water under the main streets and bridges in the city, that the power supply, water supply, gas supply, communication and traffic in the city are normal, and that there is no collapse of houses and casualties, so as to ensure the safety of the Hunhe flood control dam.

? Blue warning: the weather warning is rainstorm, with 24-hour rainfall of 25-50 mm and 3-hour rainfall 15-25 mm or more. Report four hours in advance. It is necessary to ensure that the urban area is not flooded, the traffic is not interrupted, and there are no house collapses and casualties; Ensure the safety of Hunhe flood control dam and ensure that Hunhe dam does not burst; After the rain stopped for 2 hours, there was no water under the main street and overpass.

? Yellow warning: the weather warning is rainstorm, and the rainfall in 24 hours is greater than 50 mm, and the rainfall in 3 hours is greater than or equal to 25 mm, which should be reported 5 hours in advance. When the first-class warning (yellow warning) is issued, underground passages, shopping malls and garages should be closed immediately, and cofferdams with a height of not less than 1 m should be set at the entrances and exits; All construction sites must be shut down; The urban dike rescue team must arrive at the scheduled place within the specified time and carry out rescue to ensure that the right dike of Hunhe River will not burst when the flood exceeds the standard. We should keep water, gas, electricity, traffic and people alive.