What do the three weather warning signs on TV and TV programs in Shanghai mean now?

Lightning warning, rainstorm warning, typhoon warning.

The rainstorm warning signal is an early warning signal made by the meteorological department before the rainstorm comes through meteorological monitoring. The rainstorm warning signal is divided into four levels, which are represented by blue, yellow, orange and red respectively.

In Chinese mainland, the red rainstorm warning signal is the highest level, indicating that in the past three hours, the rainfall in some areas has exceeded 100 mm, and the rainfall may continue. In the Hong Kong Special Administrative Region, there are three levels (yellow, red and black), and the black rainstorm warning signal is the highest level. The Macao Special Administrative Region only has rainstorm warning signals.

The competent meteorological department of the State Council is responsible for the issuance, cancellation and dissemination of national early warning signals. The local competent meteorological departments at all levels shall be responsible for the administration of the release, cancellation and dissemination of early warning signals within their respective administrative areas. Other relevant departments shall, in accordance with their duties, cooperate with the competent meteorological departments in the release and dissemination of early warning signals.

Rainstorm warning signal standard:

Blue warning standard

/kloc-within 0/2 hours, the rainfall will reach more than 50 mm, or it has reached more than 50 mm and the rainfall may continue.

Yellow warning standard

The rainfall will reach more than 50 mm within 6 hours, or it has reached more than 50 mm and the rainfall may continue.

Orange warning standard

The rainfall will reach more than 50 mm within 3 hours, or it has reached more than 50 mm and the rainfall may continue.

Red warning standard

Within 3 hours, the rainfall will reach 100 mm or above, or it has already reached 100 mm and the rainfall may continue.