[Quick Archive Overview]Typhoon Irma (No. 197815, a historical numbering sequence from 1978) was a 1978 Northwest Pacific typhoon. Its peak intensity was severe tropical storm, with maximum winds of 30 m/s and a minimum central pressure of 972 hPa. It did not make landfall in China. Its numbering ended on September 16, 1978, and 25 track points were recorded throughout its lifetime.
Numbering note: The internationally unified numbering system for the Northwest Pacific has been assigned by the JMA in Japan, the Tokyo Regional Professional Meteorological Centre, since 1981. This system did not exist in 1978. The number 197815 is a historical sequence retained by the CMA. The JMA in Japan, the Joint Typhoon Warning Center in the United States, and China's meteorological authorities may have assigned different numbers to the same typhoon that year, so these cannot be compared directly.
Path. Data sources: China Meteorological Administration Tropical Cyclone Best Track Dataset (CMA-STI); wind speed refers to 2-min sustained wind speed. Track points at intermediate times are encrypted based on original operational positioning data, while wind speed and pressure are interpolated using best-track anchor points.
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Overview of Typhoon Irma
Typhoon Irma at 1978-09-10 08:00 at 19.5°N, 120.5°E over the Northwest Pacific; initial intensity: Tropical Depression.
It peaked at Severe Tropical Storm intensity with max winds of 30 m/s (~108 km/h) and a minimum central pressure of 972hPa, recorded at 1978-09-13 02:00.
After 1978-09-16 08:00, Typhoon Irma gradually weakened and was stopped numbering at 1978-09-16 08:00. Its lifecycle included 25 track points.
Typhoon Irma trajectory
| Time | Position | Intensity | Wind · Pressure | Move toward |
|---|
| 09-10 08:00 | 19.5°N
120.5°E | Tropical Depression | 10 m/s
1004 hPa | - |
| 09-10 20:00 | 20.5°N
119.7°E | Tropical Depression | 15 m/s
1002 hPa | N |
| 09-11 08:00 | 22°N
121.2°E | Tropical Depression | 15 m/s
997 hPa | NNE |
| 09-11 20:00 | 23.5°N
122.1°E | Tropical Depression | 15 m/s
995 hPa | NNE |
| 09-12 08:00 | 24.9°N
122.9°E | Tropical Storm | 20 m/s
992 hPa | NNE |
| 09-12 20:00 | 25.9°N
123.7°E | Severe Tropical Storm | 25 m/s
985 hPa | NE |
| 09-13 08:00 | 27.1°N
123.5°E | Severe Tropical Storm | 30 m/s
980 hPa | NNW |
| 09-13 20:00 | 28.6°N
123.9°E | Severe Tropical Storm | 30 m/s
978 hPa | NNE |
| 09-14 08:00 | 30°N
124.7°E | Severe Tropical Storm | 30 m/s
978 hPa | NNE |
| 09-14 20:00 | 31.6°N
126°E | Severe Tropical Storm | 30 m/s
975 hPa | NE |
| 09-15 08:00 | 33.3°N
129.5°E | Severe Tropical Storm | 25 m/s
980 hPa | ENE |
| 09-15 20:00 | 34.4°N
133°E | Tropical Storm | 20 m/s
990 hPa | ENE |
| 09-16 08:00 | 35.5°N
136.6°E | Tropical Depression | 12 m/s
1000 hPa | ENE |
Sampled rows shown; all 25 track points are available on the interactive map or via the public API .
FAQ
Typhoon Irma was the 1978 Typhoon.
Irma's number 197815 is a historical sequence retained by the CMA, meaning the 15th typhoon of 1978. Its international name was IRMA. The internationally unified numbering system for the Northwest Pacific did not begin until 1981; before then, agencies such as the JMA in Japan, the Joint Typhoon Warning Center in the United States, and China's meteorological authorities used separate numbering systems, so the same typhoon may have different numbers across agencies and these cannot be compared directly.
Where does Typhoon Irma’s track data come from?
Path. Data sources: China Meteorological Administration Tropical Cyclone Best Track Dataset (CMA-STI); wind speed refers to 2-min sustained wind speed. Track points at intermediate times are encrypted based on original operational positioning data, while wind speed and pressure are interpolated using best-track anchor points.
What is the most powerful typhoon Irma?
Typhoon Irma peak intensity is Severe Tropical Storm, max wind 30m/s, minimum central pressure 972 hPa.
Is there a Typhoon Irma Landfall?
According to records, Typhoon Irma is not in our coastal landfall.
Where can I view typhoon Irma's live track map?
TyphoonSays (taifengshuo.com) provides typhoon Irma's Track history map, multinational meteorological agency Forecast comparison, wind range with IntensityTrend, page address: https://taifengshuo.com/typhoon/197815.
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