Standards of sandstorm weather in Beijing

Sand and dust weather is divided into four categories: floating dust, blowing sand, sandstorms and strong sandstorms.

Floating dust: Dust and fine sand float evenly in the air, making the horizontal visibility less than 10 kilometers;

Blowing sand: The wind blows up the dust and sand on the ground, making the air quite dense. Turbidity, a weather phenomenon with horizontal visibility within 1 km to 10 km;

Sandstorm: A weather phenomenon in which strong winds blow up a large amount of dust and sand on the ground, making the air very turbid, with horizontal visibility less than 1 km;

Strong sandstorm: A weather phenomenon in which strong winds blow up dust and sand on the ground, making the air blurry and turbid, and the horizontal visibility is less than 500 meters. Sand and dust weather processes are divided into four categories: floating dust weather processes, blowing sand weather processes, sand and dust storm weather processes and strong sand and dust storm weather processes.

Floating dust weather process: During the same weather process, 5 or more national basic (accurate) stations in my country’s weather forecast area experienced floating dust weather at the same observation time;

Sandstorm weather process: During the same weather process, 5 or more national basic (accurate) stations in my country's weather forecast area experienced sandstorm weather at the same observation time;

Sandstorms Weather process: During the same weather process, sandstorms occurred at the same observation time at three or more countries' basic (accurate) stations in my country's weather forecast area;

Strong sandstorm weather process: In During the same weather process, strong sandstorms occurred at the same observation time at three or more national basic (accurate) stations in my country's weather forecast area.

Standards

1. Decision-making services

When sand and dust weather processes are expected to occur in the next 24 hours, internal bulletins, special reports and decision-making service materials issued a sand and dust weather forecast.

2. Public forecast

National standards:

It is expected that sand and dust weather processes will occur in the next 24 hours, and the impact range will be large or affect In the Beijing-Tianjin area, a sandstorm warning was issued to the public. ;

When a sandstorm or strong sandstorm is expected to occur in the next 24 hours and will cause serious impacts, a sandstorm warning will be issued to the public.

Provincial standards:

Determined by the provincial (autonomous and municipal) meteorological bureaus with reference to national standards.

Notes:

1. Provincial sand and dust weather forecast and warning issuance standards shall be reported to the China Meteorological Administration for filing.

2. Sand and dust weather forecasts and warnings should include the area, period, intensity, possible impacts and countermeasures of sand and dust weather.

3. Before the Central Meteorological Observatory issues sand and dust weather forecast warnings to the public, it should promptly and effectively notify the relevant provincial meteorological observatories. Reports from the Meteorological Observatory and related meteorological stations.