This is storm CARMEN that was active in 1957 in the W. Pacific region with maximum winds of 215 km/h.

What was the maximum intensity of the storm?

Max Wind: 215 km/h. Min Pressure: hPa.

storm CARMEN (1957) - Track and intensity details

Name: storm CARMEN
Start: 1957-09-05
End: 1957-09-16
Location: W. Pacific

CARMEN (1957)

Storm Code: 1957249N18125 | Region: W. Pacific
Active from 06/09/1957 to 16/09/1957 (11 days)

204 km/h

1-min Wind (JTWC)

Level 17

215 km/h

10-min Wind (CMA)

Level 17

959 hPa

Min Pressure

2,690 km

Distance

Forecast Agencies

Agency	Max Intensity	Trajectory	Energy	highest_classification
CMA (China)	215	959	79	2,690	65.99	115.99	Level 17 - Super Typhoon
WMO (International) (coordinates_only)	~	960	38	2,424	~	~	Undefined
JMA (Japan) (coordinates_only)	~	960	75	2,589	~	~	Undefined
JTWC	204	~	59	2,030	64.14	99.73	Level 17 - Super Typhoon
DS824	204	~	59	1,938	64.14	99.73	Level 17 - Super Typhoon
TD9636	194	~	49	1,227	58.51	93.06	Level 16 - Super Typhoon
TD9635	204	959	51	1,343	60.23	95.47	Level 17 - Super Typhoon

Agency

Max Intensity

Trajectory

Energy

highest_classification

Max Wind (km/h)

Min Pressure (hPa)

Number of points

Distance (km)

ACE (10⁴ (km/h)²)

PDI (10⁶ (km/h)³)

CMA (China)

215

959

2,690

65.99

115.99

Level 17 - Super Typhoon

WMO (International)
(coordinates_only)

960

2,424

Undefined

JMA (Japan)
(coordinates_only)

960

2,589

Undefined

JTWC

204

2,030

64.14

99.73

Level 17 - Super Typhoon

DS824

204

1,938

64.14

99.73

Level 17 - Super Typhoon

TD9636

194

1,227

58.51

93.06

Level 16 - Super Typhoon

TD9635

204

959

1,343

60.23

95.47

Level 17 - Super Typhoon

Advanced Meteorological Indices by Agency Automatically calculated from raw data

CMA (China)

Energy
ACE (10⁴ (km/h)²)	65.99	Very High
PDI (10⁶ (km/h)³)	115.99
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+54 km/h	Fast
Max Wind Loss/Step	-46 km/h
Pressure Variation
Max Pressure Drop/Step	-6 hPa
Max Pressure Drop/24h	-19 hPa
Max Pressure Rise/Step (weakening)	+8 hPa
Movement & Duration
Avg Movement Speed	11.5 km/h
Tracking Time	234h (9.8 days)
Time as TD+ (≥34kt)	153h (6.4d)
Time as Storm+ (≥64kt)	117h (4.9d)
Peak Intensity & Range
Peak Intensity	19:00 12/09/1957 19.6°N, 123.1°E
Latitude	17.5°N – 25°N (7.5°)
Longitude	115.5°E – 130°E (14.5°)

WMO (International)

Pressure Variation
Max Pressure Drop/Step	-10 hPa
Max Pressure Drop/24h	-25 hPa	Strong
Max Pressure Rise/Step (weakening)	+10 hPa
Movement & Duration
Avg Movement Speed	10.9 km/h
Tracking Time	222h (9.3 days)
Peak Intensity & Range
Latitude	17.6°N – 26.4°N (8.8°)
Longitude	113.2°E – 129.8°E (16.6°)

JMA (Japan)

Pressure Variation
Max Pressure Drop/Step	-5 hPa
Max Pressure Drop/24h	-25 hPa	Strong
Max Pressure Rise/Step (weakening)	+5 hPa
Movement & Duration
Avg Movement Speed	11.7 km/h
Tracking Time	222h (9.3 days)
Peak Intensity & Range
Latitude	18.1°N – 25.9°N (7.8°)
Longitude	115°E – 129.7°E (14.7°)

JTWC

Energy
ACE (10⁴ (km/h)²)	64.14	Very High
PDI (10⁶ (km/h)³)	99.73
Intensification / Weakening
Max Wind Gain/Step	+6 km/h
Max Wind Gain/24h	+37 km/h	Fast
Max Wind Loss/Step	-15 km/h
Movement & Duration
Avg Movement Speed	11.7 km/h
Tracking Time	174h (7.3 days)
Time as TD+ (≥34kt)	177h (7.4d)
Time as Storm+ (≥64kt)	159h (6.6d)
Peak Intensity & Range
Peak Intensity	13:00 13/09/1957 19.8°N, 122.2°E
Latitude	19.6°N – 27°N (7.4°)
Longitude	112°E – 126.6°E (14.6°)

DS824

Energy
ACE (10⁴ (km/h)²)	64.14	Very High
PDI (10⁶ (km/h)³)	99.73
Intensification / Weakening
Max Wind Gain/Step	+6 km/h
Max Wind Gain/24h	+37 km/h	Fast
Max Wind Loss/Step	-15 km/h
Movement & Duration
Avg Movement Speed	11.1 km/h
Tracking Time	174h (7.3 days)
Time as TD+ (≥34kt)	177h (7.4d)
Time as Storm+ (≥64kt)	159h (6.6d)
Peak Intensity & Range
Peak Intensity	13:00 13/09/1957 19.8°N, 122.2°E
Latitude	19.6°N – 27°N (7.4°)
Longitude	112°E – 126.6°E (14.6°)

TD9636

Energy
ACE (10⁴ (km/h)²)	58.51	Very High
PDI (10⁶ (km/h)³)	93.06
Intensification / Weakening
Max Wind Gain/Step	+6 km/h
Max Wind Gain/24h	+37 km/h	Fast
Max Wind Loss/Step	-7 km/h
Movement & Duration
Avg Movement Speed	8.5 km/h
Tracking Time	144h (6 days)
Time as TD+ (≥34kt)	147h (6.1d)
Time as Storm+ (≥64kt)	147h (6.1d)
Peak Intensity & Range
Peak Intensity	07:00 13/09/1957 19.7°N, 122.3°E
Latitude	19.6°N – 23.8°N (4.2°)
Longitude	117.5°E – 126.6°E (9.1°)

TD9635

Energy
ACE (10⁴ (km/h)²)	60.23	Very High
PDI (10⁶ (km/h)³)	95.47
Intensification / Weakening
Max Wind Gain/Step	+6 km/h
Max Wind Gain/24h	+37 km/h	Fast
Max Wind Loss/Step	-9 km/h
Pressure Variation
Max Pressure Drop/Step	-2 hPa
Max Pressure Drop/24h	-15 hPa
Max Pressure Rise/Step (weakening)	+2 hPa
Movement & Duration
Avg Movement Speed	9 km/h
Tracking Time	150h (6.3 days)
Time as TD+ (≥34kt)	153h (6.4d)
Time as Storm+ (≥64kt)	153h (6.4d)
Peak Intensity & Range
Peak Intensity	13:00 13/09/1957 19.8°N, 122.2°E
Latitude	19.6°N – 24.6°N (5°)
Longitude	117.2°E – 126.6°E (9.4°)

Advanced Indices Legend

ACE: Accumulated Cyclone Energy - measures total storm activity

PDI: Power Dissipation Index - measures potential destructiveness

RI: Rapid Intensification - when wind increases >=30 kt/24h or pressure drops >=30 hPa/24h

Countries with Direct Landfall

🇨🇳 China

WMO

23.73°, 117.46° 1957-09-14 23:24:09

CMA 131 km/h Level 12

23.62°, 117.18° 1957-09-14 22:11:44

JMA

23.66°, 117.23° 1957-09-15 00:50:06

JTWC 139 km/h Level 13

23.85°, 117.50° 1957-09-15 00:16:32

DS824 139 km/h Level 13

23.84°, 117.49° 1957-09-15 00:19:52

TD9635 139 km/h Level 13

23.84°, 117.48° 1957-09-15 00:19:10

Values are interpolated at landfall time and may differ from actual data.

Index	Meaning	Formula / Condition	Classification
ACE Accumulated Cyclone Energy	Accumulated Cyclone Energy. Measures the total energy generated by the storm during its lifetime. Only counts reports with wind ≥ 35 kt (TS level or higher).	`ACE = Σ(V_max²) / 10&sup4;` Unit: 10⁴ kt²	< 2: Low 2-6: Medium 6-15: High ≥ 15: Very High
PDI Power Dissipation Index	Power Dissipation Index. More sensitive than ACE to extremely strong storms due to using cubic power. Reflects potential destructive power.	`PDI = Σ(V_max&sup³;) / 10&sup6;` Unit: 10⁶ kt³	Higher value = greater cumulative destructive power
RI Rapid Intensification	Rapid Intensification - storm strengthens suddenly in a short time. Very dangerous as it is difficult to forecast and causes surprise for prevention efforts.	Wind increase ≥ 30 kt/24h or Pressure drop ≥ 30 hPa/24h	Has RI or Fast increase (≥20kt)
Max wind gain/step	Maximum wind increase between 2 consecutive reports (usually 6 hours apart). Shows the fastest local intensification rate.	`max(V_i+1 - V_i)` Unit: kt (km/h)	Positive value = storm strengthening
Max wind gain/24h	Maximum wind increase in a 24-hour window. Main criterion for determining Rapid Intensification (RI).	`max(V_t+24h - V_t)` RI if ≥ 30 kt/24h	≥ 30kt: RI ≥ 20kt: Fast
Max wind loss/step	Maximum wind weakening between 2 consecutive reports. Shows at which stage the storm weakened fastest.	`max(V_i - V_i+1)` Unit: kt (km/h)	Positive value = storm weakening
Max pressure drop/step	Maximum pressure drop between 2 consecutive reports. Pressure decrease = storm center strengthening. Reflects local deepening rate.	`max(P_i - P_i+1)` Unit: hPa	Higher value = faster strengthening
Max pressure drop/24h	Maximum pressure drop in a 24-hour window. Important index for evaluating explosive deepening / explosive intensification.	`max(P_t - P_t+24h)` Explosive if ≥ 30 hPa	≥ 30hPa: RI ≥ 20hPa: Strong
Max pressure rise/step	Maximum pressure rise between 2 consecutive reports. Pressure increase = storm weakening. Large value indicates rapid weakening (due to terrain interaction, landfall, etc.).	`max(P_i+1 - P_i)` Unit: hPa	Higher value = faster weakening
Average moving speed	Average moving speed of the storm center during the entire monitoring period by that agency.	`V_avg = S_total / T_total` Unit: kt (km/h)	Slow-moving storms (<15 km/h) usually cause prolonged heavy rain
Monitoring duration	Total time from first report to last report of that agency.	`T = t_end - t_start` Unit: hours (days)	Different agencies may monitor for different durations
TS+ Duration	Total hours with average wind ≥ 34 kt (Tropical Storm level or higher). Reflects how long the storm maintained significant intensity.	Average wind ≥ 34 kt	Longer storm = greater total damage
TY+ Duration	Total hours with average wind ≥ 64 kt (Typhoon level or higher). Storms maintaining this level longer have much greater destructive power.	Average wind ≥ 64 kt	Longer time at Typhoon level = more dangerous
Peak Intensity	Time and location (lat, lon) when the storm reached maximum wind according to each agency. Helps identify where the storm was strongest.	V_max = max(V_i)	Peak location helps assess danger for nearby areas
Latitude / Longitude	Spatial range of activity by latitude and longitude. Shows whether the storm affected area is wide or narrow.	min-max(lat), min-max(lon)	Large range = long trajectory, wide impact

Index

Meaning

Formula / Condition

Classification

ACE
Accumulated Cyclone Energy

Accumulated Cyclone Energy. Measures the total energy generated by the storm during its lifetime. Only counts reports with wind ≥ 35 kt (TS level or higher).

ACE = Σ(V_max²) / 10&sup4;
Unit: 10⁴ kt²

< 2: Low
2-6: Medium
6-15: High
≥ 15: Very High

PDI
Power Dissipation Index

Power Dissipation Index. More sensitive than ACE to extremely strong storms due to using cubic power. Reflects potential destructive power.

PDI = Σ(V_max&sup³;) / 10&sup6;
Unit: 10⁶ kt³

Higher value = greater cumulative destructive power

RI
Rapid Intensification

Rapid Intensification - storm strengthens suddenly in a short time. Very dangerous as it is difficult to forecast and causes surprise for prevention efforts.

Wind increase ≥ 30 kt/24h or Pressure drop ≥ 30 hPa/24h

Has RI or
Fast increase (≥20kt)

Max wind gain/step

Maximum wind increase between 2 consecutive reports (usually 6 hours apart). Shows the fastest local intensification rate.

max(V_i+1 - V_i)
Unit: kt (km/h)

Positive value = storm strengthening

Max wind gain/24h

Maximum wind increase in a 24-hour window. Main criterion for determining Rapid Intensification (RI).

max(V_t+24h - V_t)
RI if ≥ 30 kt/24h

≥ 30kt: RI
≥ 20kt: Fast

Max wind loss/step

Maximum wind weakening between 2 consecutive reports. Shows at which stage the storm weakened fastest.

max(V_i - V_i+1)
Unit: kt (km/h)

Positive value = storm weakening

Max pressure drop/step

Maximum pressure drop between 2 consecutive reports. Pressure decrease = storm center strengthening. Reflects local deepening rate.

max(P_i - P_i+1)
Unit: hPa

Higher value = faster strengthening

Max pressure drop/24h

Maximum pressure drop in a 24-hour window. Important index for evaluating explosive deepening / explosive intensification.

max(P_t - P_t+24h)
Explosive if ≥ 30 hPa

≥ 30hPa: RI
≥ 20hPa: Strong

Max pressure rise/step

Maximum pressure rise between 2 consecutive reports. Pressure increase = storm weakening. Large value indicates rapid weakening (due to terrain interaction, landfall, etc.).

max(P_i+1 - P_i)
Unit: hPa

Higher value = faster weakening

Average moving speed

Average moving speed of the storm center during the entire monitoring period by that agency.

V_avg = S_total / T_total
Unit: kt (km/h)

Slow-moving storms (<15 km/h) usually cause prolonged heavy rain

Monitoring duration

Total time from first report to last report of that agency.

T = t_end - t_start
Unit: hours (days)

Different agencies may monitor for different durations

TS+ Duration

Total hours with average wind ≥ 34 kt (Tropical Storm level or higher). Reflects how long the storm maintained significant intensity.

Average wind ≥ 34 kt

Longer storm = greater total damage

TY+ Duration

Total hours with average wind ≥ 64 kt (Typhoon level or higher). Storms maintaining this level longer have much greater destructive power.

Average wind ≥ 64 kt

Longer time at Typhoon level = more dangerous

Peak Intensity

Time and location (lat, lon) when the storm reached maximum wind according to each agency. Helps identify where the storm was strongest.

V_max = max(V_i)

Peak location helps assess danger for nearby areas

Latitude / Longitude

Spatial range of activity by latitude and longitude. Shows whether the storm affected area is wide or narrow.

min-max(lat), min-max(lon)

Large range = long trajectory, wide impact

CARMEN (1957)

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Countries with Direct Landfall

CARMEN

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CARMEN (1957)

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Advanced Meteorological Indices by Agency Automatically calculated from raw data

Advanced Indices Legend

Countries with Direct Landfall

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