What does blue stand for in the weather? What does yellow stand for? What does red stand for?

Red warning, yellow warning and blue warning only refer to the degree of weather change. Red is the strongest, followed by orange/yellow, and blue is weak.

Generally, there are blue warning of thunderstorm and gale (thunderstorm and gale, short-term heavy precipitation weather), red warning of rainstorm (rainfall will reach 100 mm or more), yellow warning of rainstorm (expected precipitation is below 100 mm), orange warning of high temperature (high temperature above 37℃ will occur) and so on.