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Last Updated:

July 25, 2013

 
General description of the CMA Tropical Cyclone Satellite Analysis Data

The dataset includes the CMA historical (since 1985) satellite estimates for tropical cyclone intensity, which are based on the Dvorak technique. These satellite estimates were one of the data sources used to develop the Best Track Dataset. The relationship between the current intensity (CI) number and tropical cyclone maximum sustained wind speed (MSW) is as follows:

CI MSW (m/s)
1985–1993 1994–
1.5 13 13
2.0 15 15
2.5 18 18
3.0 20

23

3.5 28 28
4.0 30 33
4.5 39 39
5.0 43 46
5.5 52 52
6.0 56 59
6.5 65 65
7.0 72 72
7.5 79 79
8.0 87 87

Digitization of the entire dataset is not yet complete; the currently available data cover the period 2008–2012.

 
Filename Format

CHYYYYSAT.txt ––

        CH: First label of the dataset, denotes CHINA.

    YYYY: Four-digit calendar year.

      SAT: Second label of the dataset, denotes SATELLITE ANALYSIS data.

 
Data Format

1.  Header record

AAAAA 5 columns Header line indicator, '55555' indicates satellite analysis data.
BBBB 4 columns International ID.
CCC 3 columns Number of data lines.
DDDD 4 columns Tropical cyclone serial number.
EEEE 4 columns Chinese ID.
F 1 column Flag of the last data line, now F = 0.
G 1 column Time interval, now G = 0.
H...H 20 columns Storm names, ‘(-)n’ denotes sub-center and its number. The sub-center refers to a center that was split or induced from the original tropical cyclone circulation center.
I...I 8 columns Date of the latest revision.
 

2. Satellite analysis data record

YYYYMMDDHH: Date and time in UTC: 4-digit year, 2-digit month, 2-digit day, and 2-digit hour
I: Intensity category according to the Chinese National Standard for Grade of Tropical Cyclones (which has been used since 15 June 2006):
0 –– Weaker than Tropical Depression or unknown intensity;
1 –– Tropical Depression (TD: 10.8–17.1 m/s);
2 –– Tropical Storm (TS: 17.2–24.4 m/s);
3 –– Severe Tropical Storm (STS: 24.5–32.6 m/s);
4 –– Typhoon (TY: 32.7–41.4 m/s);
5 –– Severe Typhoon (STY: 41.5–50.9 m/s);
6 –– Super Typhoon (SuperTY: ≥51.0 m/s);
9 –– Extratropical Cyclone (ET) stage.
LAT: Latitude (0.1°N).
LONG: Longitude (0.1°E).
CIN: Current intensity (CI) number.
WND:

Two-minute mean maximum sustained wind (MSW; m/s) near the TC center.

WND = 9 indicates MSW < 10 m/s,
WND = 0 indicates unknown intensity.
 
Citation

Please indicate that the CMA Satellite Analysis Dataset for Tropical Cyclones over the Western North Pacific was obtained from tcdata.typhoon.gov.cn, and refer to the following paper in any written work using the dataset:

  • Ying, M., W. Zhang, H. Yu, X. Lu, J. Feng, Y. Fan, Y. Zhu, and D. Chen, 2014: An overview of the China Meteorological Administration tropical cyclone database. J. Atmos. Oceanic Technol., 31, 287-301. doi: 10.1175/JTECH-D-12-00119.1 (Click to view)
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