Standard number: QX/T 496-2019
Standard name: Monitoring indices of rainy season
in China-Autumn rain of West China English name: Monitoring indices of rainy season in China-Autumn rain of West China ||
tt||Standard format: PDF
Release time: 2019-09-18
Implementation time: 2019-12-01
Standard size: 1516K
Introduction to Standard: This standard was drafted in accordance with the rules given in GB/T1.1-2009.
This standard was proposed and managed by the National Technical Committee for Climate and Climate Change Standardization (SAC/TC540). The drafting units of this standard are: National Climate Center, Sichuan Climate Center, National Meteorological Center, Hubei Climate Center, Hunan Climate Center, Chongqing Climate Center,
Guizhou Climate Center, Shaanxi Climate Center, Gansu Climate Center, Ningxia Hui Autonomous Region Climate Center. The main drafters of this standard are: Li Duo, Si Dong, Ke Zongjian, Liu Yanju, Ma Zhenfeng, Zhang Shunqian, Bao Yuanyuan, Xiao Ying, Wu Xianyun, Tang Hongyu, Zhou Tao, Tian Wuwen, Lin Shu, and Zheng Guangfen. This standard specifies the monitoring scope, start and end dates, length and intensity of autumn rain in western China, as well as the calculation methods.
This standard applies to the monitoring, prediction, evaluation and service of autumn rain in western China.
2 Terms and Definitions
The following terms and definitions apply to this document.
1
West China
The area between 25°N-36°N, 100°E-11°E in China, including six provinces, one autonomous region and one municipality, namely Hubei, Hunan, Chongqing, Sichuan, Guizhou, Shaanxi, Ningxia and Gansu.
Note: According to the regional climate characteristics of autumn rain in western China, the Qinling Mountains are used as the boundary to divide it into two climate zones (referred to as the south zone and the north zone respectively). The south zone mainly includes western Hubei, western Hunan, Chongqing, eastern Sichuan and northern Guizhou, and the north zone mainly includes southern Shaanxi, southern Ningxia and southeastern Gansu.
Autumn rain in western China
Special weather phenomenon of heavy rain in western China that usually occurs in autumn
,3
Day of autumn
From August 21, if the daily rainfall of more than or equal to 50% of the stations in the monitoring area of ​​western China is greater than or equal to 0.1mm on a certain day, it is an autumn rain day, otherwise it is a non-autumn rain day
Note: See Appendix A for the distribution map of monitoring stations in western China, and see Appendix B for monitoring station information.
Climatologic! Normal
Climatological state
Annual value
The average value of meteorological elements in the last three consecutive full decades.
Note: According to the relevant regulations of the World Meteorological Organization (WMO), it is updated every decade, that is, during the period of 201-2020, the average value of 1981-2010 is used as its climate average value, and so on.
This standard specifies the monitoring scope, start and end dates, length and intensity of autumn rain in western China, and the calculation method. This standard is applicable to the monitoring, prediction, evaluation and service of autumn rain in western China.

ICS07.060
Meteorological Industry Standard of the People's Republic of China
QX/T496—2019
Monitoring indices of rainy season in ChinaAutumn rain of West China China Industry Standard Information Service Platform
Released on 2019-09-18
China Meteorological Administration
Implementation on 2019-12-01
Industry Standard Information Service Platform
Terms and Definitions
Monitoring Indicators
Intensity Index
Appendix A (Informative Appendix)
Appendix B (Informative Appendix)
Appendix C (Normative Appendix)
References
Distribution Map of Autumn Rain Monitoring Stations in Western China
Information of Autumn Rain Monitoring Stations in Western China
Calculation Method of Standard Deviation
QX/T496—2019
Industry Standard Information Service Platform
Industry Standard Information Service Platform
This standard was drafted in accordance with the rules given in GB/T1.1—2009. This standard is proposed and managed by the National Technical Committee for Climate and Climate Change Standardization (SAC/TC540). QX/T496—2019
The drafting units of this standard are: National Climate Center, Sichuan Climate Center, National Meteorological Center, Hubei Climate Center, Hunan Climate Center, Chongqing Climate Center, Guizhou Climate Center, Shaanxi Climate Center, Gansu Climate Center, Ningxia Hui Autonomous Region Climate Center. The main drafters of this standard are: Li Duo, Si Dong, Ke Zongjian, Liu Yanju, Ma Zhenfeng, Zhang Shunqian, Bao Yuanyuan, Xiao Ying, Wu Xianyun, Tang Hongyu, Zhou Tao, Tian Wuwen, Lin, Zheng Guangfen.
Industry Standard Information Service Platform
QX/T496—2019
Huaxi Autumn Rain is a special weather phenomenon of continuous rain in autumn in the western part of my country, mainly appearing in Sichuan, Chongqing, Guizhou, southeastern Gansu, southern Ningxia, southern Shaanxi, western Hunan, and western Hubei. Although the precipitation in West China Autumn Rain is less than that in summer, the continuous precipitation is also likely to cause autumn floods.
Industry Standard Information Service Platform
1 Scope
China Rainy Season Monitoring Indicators
West China Autumn Rain
QX/T496—2019
This standard specifies the monitoring scope, start and end dates, length and intensity of the autumn rain period and other indicators and calculation methods for West China Autumn Rain. This standard applies to the monitoring, prediction, evaluation and service of West China Autumn Rain. 2 Terms and Definitions
The following terms and definitions apply to this document. 2.1
West China
The area between 25°N and 36°N and 100°E and 111°E in China, including 6 provinces, 1 autonomous region and 1 municipality directly under the Central Government, namely, Hubei, Hunan, Chongqing, Sichuan, Guizhou, Shaanxi, Ningxia and Gansu.
Note: According to the regional climate characteristics of autumn rain in West China, the Qinling Mountains are used as the boundary to divide it into two climate zones (referred to as the south zone and the north zone respectively). The south zone mainly includes western Hubei, western Hunan, Chongqing, eastern Sichuan and northern Guizhou, and the north zone mainly includes southern Shaanxi, southern Ningxia and southeastern Gansu. 2.2
Autumn rain in West China
autumn rain of West China
A special weather phenomenon of heavy rain in West China that usually occurs in autumn. 2.3
Autumn rain day day of autumn rainy season From August 21, if the daily rainfall of more than or equal to 50% of the stations in the monitoring area of ​​West China is greater than or equal to 0.1 mm on a certain day, it is called an autumn rain day, otherwise it is a non-autumn rain day. Note: For the layout of monitoring stations in West China, please refer to Appendix A, and for the information of monitoring stations, please refer to Appendix B. 2.4
Climate average
climatologiaormel
Climate state
Annual value
Smart service platform
Note: According to the relevant regulations of the World Meteorological Organization (WMO), during the period of 1-2020 of each decade, the average value of 1981-2010 is used as its climate average, and so on. 3 Monitoring indicators
Data requirements
The daily average (20:00-20:00 daily average) precipitation data of the monitoring stations in the western China from August 21 to November 30 each year are used.
3.2 Starting date
From August 21, if there are five consecutive autumn rain days in the south/north region, or only one non-autumn rain day occurs between the 2nd and 4th days among five consecutive days, the Huaxi Autumn Rain begins in that region, and the first autumn rain day is set as the starting date of the Huaxi Autumn Rain in that region. The starting date of the Huaxi Autumn Rain in the south and north regions with the earliest start of the Huaxi Autumn Rain is set as the starting date of the Huaxi Autumn Rain. 3.3 End date
3.3.1 End date of the northern region
After the start of the Huaxi Autumn Rain, the end date of the last rainfall-heavy period (five consecutive autumn rainy days, or only one non-autumn rainy day in the second to fourth days of five consecutive days) until October 31 (inclusive) (i.e. the day after the last autumn rainy day) is set as the end date of the Huaxi Autumn Rain in the northern region, indicating that the Huaxi Autumn Rain ends in the northern region. 3.3.2 End date of the southern region
After the start of the Huaxi Autumn Rain, the end date of the last rainfall-heavy period (five consecutive autumn rainy days, or only one non-autumn rainy day in the second to fourth days of five consecutive days) until November 30 (inclusive) (i.e. the day after the last autumn rainy day) is set as the end date of the Huaxi Autumn Rain in the southern region, indicating that the Huaxi Autumn Rain ends in the southern region. 3.3.3 End date of Huaxi Autumn Rain
In the southern and northern regions, the end date of the Huaxi Autumn Rain in the region where the end date is the latest is taken as the end date of Huaxi Autumn Rain. 3.4 Special Autumn Rain Years
3.4.1 If the start and end dates of Huaxi Autumn Rain in a certain year cannot be determined based on monitoring indicators, but if there is an obvious continuous precipitation process during the autumn rain monitoring period (the proportion of autumn rain days during the process to the total number of days in the monitoring period is greater than or equal to 50%, the process length is greater than or equal to 10 days, and there are no five consecutive non-autumn rain days), then the start date of the first continuous precipitation process that meets the above criteria (the first autumn rain day in the process) is determined as the start date of Huaxi Autumn Rain, and the end date of the last continuous precipitation process (the day after the last autumn rain day in the process) is determined as the end date of Huaxi Autumn Rain
3.4.2 If the start and end dates of Huaxi Autumn Rain cannot be identified in a certain year based on monitoring indicators and 3.4.1, then the Huaxi Autumn Rain in that year is deemed to be an empty rainy season.
3.4.3 If the Huaxi Autumn Rain Start Index is met before August 21st in a year and ends before the end of August, this situation is regarded as non-autumn rain. If the Huaxi Autumn Rain Start Index is met before August 21st in a year and continues until the end of September, this situation is regarded as the start of the Huaxi Autumn Rain, and the first autumn rain day after August 21st is set as the start date of the Huaxi Autumn Rain. 3.4.4 If the Huaxi Autumn Rain continues until the last day of the monitoring period (October 31st for the North District and its related administrative regions, and November 30th for the South District and its related administrative regions) in a year and has not ended, the last autumn rain before October 31st (North District)/November 30th (South District) is the total number of days between the start date and the end date of the Huaxi Autumn Rain (including the start date, excluding the last day) as the length of the Huaxi Autumn Rain period (L). 3.6 Autumn Rainfall
During the Huaxi Autumn Rainfall, the cumulative value of the daily average precipitation at the monitoring station is the Huaxi Autumn Rainfall (R) in the area. 4 Intensity Index
4.1 Autumn Rainfall Period Length Index
The Autumn Rainfall Period Length Index (I) is an indicator that characterizes the length of the Huaxi Autumn Rainfall period in a certain year, see formula (1): 2
Where:
The length of the autumn rainy period in a certain year, in days (d); L
-the standard climate value of the length of the autumn rainy period, in days (d); Lo
SThe standard deviation of the length of the autumn rainy period, see Appendix C for calculation. 4.2 Autumn Rainfall Index
The Autumn Rainfall Index (I) is an indicator of the amount of autumn rainfall in western China in a certain year, see formula (2):RR
Where:
R is the amount of autumn rainfall in a certain year, in millimeters (mm);R
is the standard climate value of autumn rainfall, in millimeters (mm);SR is the standard deviation of autumn rainfall, see Appendix C for calculation4.3 Autumn Rain Comprehensive Intensity Index
The Autumn Rain Comprehensive Intensity Index (I,) is calculated as shown in formula (3): =0.3×I,+0.7×12
QX/T496—2019
...(1)
Using the comprehensive intensity index of autumn rain as the basis for classification, the intensity of autumn rain in western China is divided into 5 levels. The classification is shown in Table 1. Table 1 Classification of autumn rain intensity in western China
Grade description
Significantly weak
Indicator range
1.2<1<-0.5
-0.5≤1≤0.5
Industry standard information service platform
0.5<1<1.2
Significantly strong
QX/T496-2019
Appendix A
(Informative Appendix)
Distribution map of autumn rain monitoring stations in western China
Figure A, 1 shows the distribution map of autumn rain monitoring stations in western China. The boxes represent stations in the northern area, and the dots represent stations in the southern area. 35*
Heyezongzhun Information Service Platform
110°E
1 Distribution map of autumn rain monitoring stations in western China
Appendix B
(Informative Appendix]
Information of autumn rain monitoring stations in western China
QX/T496—2019
Table B.1 and Table B.2 give the information of 269 monitoring stations in the southern area of ​​western China and 104 monitoring stations in the northern area. Information on monitoring stations in the southern area of ​​western China
Province (autonomous region, municipality directly under the central government)|| tt||Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
|Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Danjiangkou
Laohekou
Shennongjia
Yiling District
Province (autonomous region, municipality directly under the Central Government)
Hubei Province
Hubei Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province| |tt||Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Chongqing City
Chongqing City
Zhangdazhen
Chongqing City
Chongqing City
Hunan Province
Hunan Province
Hunan Province||tt| |Hunan Province
Hunan Province
Shapingba
QX/T496—2019
Province (autonomous region, municipality directly under the central government)
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City| |tt||Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Chongqing City
Chongqing City
tt| |Lengshuijiang
Shaoyang City
Shaoyang County
Dujiangyan
Information of monitoring stations in the southern area of ​​West China Autumn Rain (continued) Station No.
Province (autonomous region, municipality directly under the central government)
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Sichuan Province
Sichuan Province
Sichuan Province
|Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province2 gives the information of 269 monitoring stations in the southern area of ​​West China Autumn Rain and 104 monitoring stations in the northern area. Information of monitoring stations in the southern area of ​​West China Autumn Rain
Province (autonomous region, municipality directly under the central government)
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hunan Province| |tt||Hunan Province
Hunan Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Danjiangkou
Laohekou
Shennongjia
Yiling District||t t||Province (autonomous region, municipality directly under the central government)
Hubei Province
Hubei Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Shapingba
QX/T496—2019
Province (autonomous region, municipality directly under the central government)
Hunan Province
Hunan Province||t t||Hunan Province
Hunan Province
Hunan Province
Hunan Province
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
|Chongqing City
Chongqing City
Chongqing City
Chongqing City
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Chongqing City
Lengshuijiang
Shaoyang City
Shaoyang County
Dujiangyan
Hua Information on monitoring stations in the South District of Xiqiuyu (continued) Station number
Province (autonomous region, municipality directly under the central government)
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province2 gives the information of 269 monitoring stations in the southern area of ​​West China Autumn Rain and 104 monitoring stations in the northern area. Information of monitoring stations in the southern area of ​​West China Autumn Rain
Province (autonomous region, municipality directly under the central government)
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hunan Province| |tt||Hunan Province
Hunan Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Hubei Province
Danjiangkou
Laohekou
Shennongjia
Yiling District||t t||Province (autonomous region, municipality directly under the central government)
Hubei Province
Hubei Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Hunan Province
Shapingba
QX/T496—2019
Province (autonomous region, municipality directly under the central government)
Hunan Province
Hunan Province||t t||Hunan Province
Hunan Province
Hunan Province
Hunan Province
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
|Chongqing City
Chongqing City
Chongqing City
Chongqing City
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Chongqing City
Lengshuijiang
Shaoyang City
Shaoyang County
Dujiangyan
Hua Information on monitoring stations in the South District of Xiqiuyu (continued) Station number
Province (autonomous region, municipality directly under the central government)
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Chongqing City
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
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Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
Sichuan Province
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