River Flood Information
Flood-related information for designated rivers in Shanghai and a list of observation stations. Levels:
Normal：Normal water level.
Flood Attention：River will likely exceed warning level. (Warning level -0.25m)
Flood Warning：River has exceeded warning level and may exceed guaranteed level.
Flood Danger：River is at the brink of flooding (historical high or guaranteed level).
Flood Occurring：River has flooded (exceeded levee crest). Ensure your safety.
Rainfall Information
Shanghai 24-hour / 1-hour rainfall overview. Levels:
Light Rain：24-hour / 1-hour: ≥ 0.1 mm.
Moderate Rain：24-hour: ≥ 10 mm; 1-hour: ≥ 1.6 mm.
Heavy Rain：24-hour: ≥ 25 mm; 1-hour: ≥ 7 mm.
Rainstorm：Use caution outdoors. 24-hour: ≥ 50 mm; 1-hour: ≥ 15 mm.
Severe Rainstorm：Avoid going out unless necessary. 24-hour: ≥ 100 mm; 1-hour: ≥ 40 mm.
Extraordinary Rainstorm：Ensure your safety. 24-hour: ≥ 250 mm; 1-hour: ≥ 50 mm.
1-Hour Rainfall Return Period
Return period (frequency) for 1-hour rainfall in Shanghai. Levels:
Below 0.5-year event：Less than 27.2 mm.
1- to 10-year event：27.2–67.3 mm.
10- to 30-year event：67.3–82 mm.
30- to 50-year event：82–88.8 mm.
50- to 70-year event：88.8–93.3 mm.
70- to 90-year event：93.3–96.7 mm.
100-year event：≥ 96.7 mm.
Note: If any data appears on this map, it means rainfall has exceeded rainstorm criteria. Stay safe.
Warning Information
Official Shanghai flood-control emergency responses and weather warnings. Levels:
Blue Warning：Specific hazardous weather may occur.
Yellow Warning：Specific hazardous weather will occur and may threaten property.
Orange Warning：Hazardous weather will occur and may trigger secondary disasters, threatening life and property.
Red Warning：Once-in-a-century hazardous weather will or has already occurred, likely causing major secondary disasters and posing urgent danger to life and property.
Wind Speed & Direction
Wind speed and direction information for Shanghai. Levels:
Below Level 1：Calm.
Level 1–4：Light breeze, gentle breeze.
Level 5–6：Strong breeze, fresh gale.
Level 7–9：High wind, strong gale.
Level 10–12：(Extremely rare) Storm.
Above Level 12：(Once-in-a-millennium) Hurricane.
Road Inundation
Road inundation information for parts of Shanghai. Levels:
Below 1 cm：No inundation.
1–15 cm：Light inundation.
15–30 cm：Moderate inundation. May sweep away pedestrians.
30–50 cm：Heavy inundation. Can sweep away pedestrians.
Above 50 cm：Severe inundation. Can sweep away pedestrians and vehicles; may flood lower-floor hallways.