GB/T 20484-2017 Cold Air Grade GB/T20484-2017 |tt||Standard compression package decompression password: www.bzxz.net
This standard specifies the cold air grade and the grade classification method. ?This standard is applicable to the monitoring, forecasting, early warning, assessment and scientific research of cold air.

ICS07.060
National Standard of the People's Republic of China
GB/T20484—2017
Replaces GB/T20484—2006
Grade of cold air
Issued on 2017-05-12
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 2017-12-01
This standard was drafted in accordance with the rules given in GB/T1.1-2009. GB/T20484—2017
This standard replaces GB/T20484—2006 Grade of cold air. Compared with GB/T20484-2006, in addition to editorial changes, the main technical changes are:
- The definitions of all terms have been modified (see Chapter 2, Chapter 2 of the 2006 edition);- The "moderate cold air" and "strong cold air" in the five cold air levels have been merged into one level of "strong cold air" (see Table 1, Chapter 3 of the 2006 edition).
This standard is proposed by the China Meteorological Administration.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Meteorological Disaster Prevention and Mitigation (SAC/TC345). The drafting unit of this standard: National Meteorological Center. The main drafters of this standard: Zhou Qingliang, Li Yanxiang, Lin Yucheng, Zhang Guocai, Qin Huafeng, Liu Xinhua. The previous versions of the standards replaced by this standard are: - GB/T20484-2006.
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GB/T20484—2017
Cold air, especially strong cold air and cold wave, is one of the major disastrous weather in my country, with the characteristics of wide impact range, long duration and serious disasters. The frequent occurrence of cold air will not only cause huge losses to the national economy, especially agriculture and animal husbandry, but also cause serious impact and harm to the environment and people's lives and health. In order to unify and standardize the classification standards of cold air in my country and make the monitoring, forecasting, early warning, assessment, research and prevention of cold air more standardized, this standard is formulated. HKAoNniKAca
1 Scope
Cold air level
This standard specifies the cold air level and the level classification method. This standard applies to the monitoring, forecasting, early warning, assessment and scientific research of cold air. 2 Terms and definitions
The following terms and definitions apply to this document. 2.1
cold aircoldair
an air mass that lowers the temperature of the places it passes through. 2.2
dailyminimumtemperaturedailyminimumtemperaturethe lowest temperature between 14:00 on the previous day and 14:00 on the current day. 2.3
decrease of daily minimum temperature in 24 hoursthe difference between the daily minimum temperature within 24 hours after 14:00 on a certain day and the daily minimum temperature on that day. 2.4
decrease of dailyminimumtemperature in48hoursthe difference between the lowest daily minimum temperature within 48 hours after 14:00 on a certain day and the daily minimum temperature on that day. 2.5
decrease of daily minimum temperature in 72 hoursthe difference between the lowest daily minimum temperature within 72 hours after 14:00 on a certain day and the daily minimum temperature on that day. 3 Classification
GB/T20484—2017
The cold air is divided into four levels: weak cold air, relatively strong cold air, strong cold air and cold wave, based on the two indicators of the drop in the daily minimum temperature and the daily minimum temperature value in a certain area affected by the cold air within a certain period of time. The classification method is detailed in Table 1. Table 1 Cold air level classification table
Weak cold air
Strong cold air
Strong cold air
The temperature drops by less than 6℃ within 48 hoursClassification indicators
The temperature drops by more than or equal to 6℃ but less than 8℃ within 48 hours: or the temperature drops by more than or equal to 8℃ within 48 hours, but fails to make the local daily minimum temperature drop to 8℃ or belowThe temperature drops by more than or equal to 8℃ within 48 hours, and makes the local daily minimum temperature drop to 8C or belowThe temperature drops by more than or equal to 8℃ within 24 hours, or the temperature drops by more than or equal to 10℃ within 48 hours, or the temperature drops by more than or equal to 12℃ within 72 hours, and makes the local daily minimum temperature drop to 4C or below. The daily minimum temperature should drop continuously by 1 within 48 hours and 72 hours. GB/T20484—2017. References. China Meteorological Administration. Specification for Ground Meteorological Observation [M]. Beijing: Meteorological Press, 2003. Measures for Issuance and Dissemination of Meteorological Disaster Warning Signals (Order No. 16 of China Meteorological Administration in 2007) [2] Measures for Issuance of Meteorological Disaster Warning Signals by the Central Meteorological Observatory [3] Monitoring Network Department of China Meteorological Administration. Ground Meteorological Code Manual [M]. Beijing: Meteorological Press, 1999 [5] Editorial Committee of Atmospheric Science Dictionary. Atmospheric Science Dictionary [M]. Beijing: Meteorological Press, 1994. KAca
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GB/T20484-2017
People's Republic of China
National Standard
Cold Air Level
GB/T20484—2017
Published and distributed by China Standards Press
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