This is storm IDA that was active in 1966 in the W. Pacific region with maximum winds of 185 km/h.

What was the maximum intensity of the storm?

Max Wind: 185 km/h. Min Pressure: hPa.

storm IDA (1966) - Track and intensity details

Name: storm IDA
Start: 1966-09-18
End: 1966-09-26
Location: W. Pacific

IDA (1966)

Storm Code: 1966261N13158 | Region: W. Pacific
Active from 18/09/1966 to 26/09/1966 (9 days)

185 km/h

1-min Wind (JTWC)

Level 16

167 km/h

10-min Wind (HKO)

Level 15

960 hPa

Min Pressure

5,483 km

Distance

Forecast Agencies

Agency	Max Intensity	Trajectory	Energy	highest_classification
CMA (China)	143	961	67	5,483	12.83	14.86	Level 13 - Violent Storm
WMO (International) (coordinates_only)	~	960	18	4,553	~	~	Undefined
JTWC	185	~	33	4,245	28.95	45.23	Level 16 - Super Typhoon
JMA (Japan) (coordinates_only)	~	960	35	4,679	~	~	Undefined
HKO (Hong Kong)	167	960	25	3,394	21.81	31.44	Level 15 - Violent Storm
DS824	185	~	33	4,245	28.95	45.23	Level 16 - Super Typhoon
TD9636	185	~	25	3,405	27.99	44.78	Level 16 - Super Typhoon
TD9635	185	963	27	3,901	28.50	44.97	Level 16 - 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)

143

961

5,483

12.83

14.86

Level 13 - Violent Storm

WMO (International)
(coordinates_only)

960

4,553

Undefined

JTWC

185

4,245

28.95

45.23

Level 16 - Super Typhoon

JMA (Japan)
(coordinates_only)

960

4,679

Undefined

HKO (Hong Kong)

167

960

3,394

21.81

31.44

Level 15 - Violent Storm

DS824

185

4,245

28.95

45.23

Level 16 - Super Typhoon

TD9636

185

3,405

27.99

44.78

Level 16 - Super Typhoon

TD9635

185

963

3,901

28.50

44.97

Level 16 - Super Typhoon

Advanced Meteorological Indices by Agency Automatically calculated from raw data

CMA (China)

Energy
ACE (10⁴ (km/h)²)	12.83	Medium
PDI (10⁶ (km/h)³)	14.86
Intensification / Weakening
Max Wind Gain/Step	+9 km/h
Max Wind Gain/24h	+54 km/h	Fast
Max Wind Loss/Step	-19 km/h
Pressure Variation
Max Pressure Drop/Step	-7 hPa
Max Pressure Drop/24h	-25 hPa	Strong
Max Pressure Rise/Step (weakening)	+7 hPa
Movement & Duration
Avg Movement Speed	27.7 km/h
Tracking Time	198h (8.3 days)
Time as TD+ (≥34kt)	69h (2.9d)
Time as Storm+ (≥64kt)	18h (0.8d)
Peak Intensity & Range
Peak Intensity	08:00 24/09/1966 26.4°N, 138.4°E
Latitude	13.3°N – 41°N (27.7°)
Longitude	137.7°E – 158.3°E (20.6°)

WMO (International)

Pressure Variation
Max Pressure Drop/Step	-8 hPa
Max Pressure Drop/24h	-24 hPa	Strong
Max Pressure Rise/Step (weakening)	+26 hPa
Movement & Duration
Avg Movement Speed	44.6 km/h
Tracking Time	102h (4.3 days)
Peak Intensity & Range
Latitude	16.5°N – 41.5°N (25°)
Longitude	137.8°E – 156°E (18.2°)

JTWC RI

Energy
ACE (10⁴ (km/h)²)	28.95	High
PDI (10⁶ (km/h)³)	45.23
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+83 km/h	RI
Max Wind Loss/Step	-28 km/h
Movement & Duration
Avg Movement Speed	44.2 km/h
Tracking Time	96h (4 days)
Time as TD+ (≥34kt)	87h (3.6d)
Time as Storm+ (≥64kt)	54h (2.3d)
Peak Intensity & Range
Peak Intensity	08:00 24/09/1966 26.5°N, 138.3°E
Latitude	16.2°N – 43°N (26.8°)
Longitude	137.7°E – 150.7°E (13°)

JMA (Japan)

Pressure Variation
Max Pressure Drop/Step	-4 hPa
Max Pressure Drop/24h	-24 hPa	Strong
Max Pressure Rise/Step (weakening)	+13 hPa
Movement & Duration
Avg Movement Speed	45.9 km/h
Tracking Time	102h (4.3 days)
Peak Intensity & Range
Latitude	16°N – 41°N (25°)
Longitude	137.7°E – 156°E (18.3°)

HKO (Hong Kong) RI

Energy
ACE (10⁴ (km/h)²)	21.81	High
PDI (10⁶ (km/h)³)	31.44
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+74 km/h	RI
Max Wind Loss/Step	-24 km/h
Pressure Variation
Max Pressure Drop/Step	-3 hPa
Max Pressure Drop/24h	-17 hPa
Max Pressure Rise/Step (weakening)	+11 hPa
Movement & Duration
Avg Movement Speed	47.1 km/h
Tracking Time	72h (3 days)
Time as TD+ (≥34kt)	72h (3d)
Time as Storm+ (≥64kt)	51h (2.1d)
Peak Intensity & Range
Peak Intensity	08:00 24/09/1966 26.4°N, 138°E
Latitude	16.2°N – 39.9°N (23.7°)
Longitude	137.7°E – 150.6°E (12.9°)

DS824 RI

Energy
ACE (10⁴ (km/h)²)	28.95	High
PDI (10⁶ (km/h)³)	45.23
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+83 km/h	RI
Max Wind Loss/Step	-28 km/h
Movement & Duration
Avg Movement Speed	44.2 km/h
Tracking Time	96h (4 days)
Time as TD+ (≥34kt)	87h (3.6d)
Time as Storm+ (≥64kt)	54h (2.3d)
Peak Intensity & Range
Peak Intensity	08:00 24/09/1966 26.5°N, 138.3°E
Latitude	16.2°N – 43°N (26.8°)
Longitude	137.7°E – 150.7°E (13°)

TD9636 RI

Energy
ACE (10⁴ (km/h)²)	27.99	High
PDI (10⁶ (km/h)³)	44.78
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+83 km/h	RI
Max Wind Loss/Step	-24 km/h
Movement & Duration
Avg Movement Speed	47.3 km/h
Tracking Time	72h (3 days)
Time as TD+ (≥34kt)	75h (3.1d)
Time as Storm+ (≥64kt)	54h (2.3d)
Peak Intensity & Range
Peak Intensity	08:00 24/09/1966 26.5°N, 138.3°E
Latitude	16.2°N – 39.9°N (23.7°)
Longitude	137.6°E – 150.7°E (13.1°)

TD9635 RI

Energy
ACE (10⁴ (km/h)²)	28.50	High
PDI (10⁶ (km/h)³)	44.97
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+83 km/h	RI
Max Wind Loss/Step	-28 km/h
Pressure Variation
Max Pressure Drop/Step	-3 hPa
Max Pressure Drop/24h	-19 hPa
Max Pressure Rise/Step (weakening)	+6 hPa
Movement & Duration
Avg Movement Speed	50 km/h
Tracking Time	78h (3.3 days)
Time as TD+ (≥34kt)	81h (3.4d)
Time as Storm+ (≥64kt)	54h (2.3d)
Peak Intensity & Range
Peak Intensity	08:00 24/09/1966 26.5°N, 138.3°E
Latitude	16.2°N – 42.2°N (26°)
Longitude	137.7°E – 150.7°E (13°)

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

🇯🇵 Japan

WMO

34.97°, 138.49° 1966-09-24 15:33:03

CMA 98 km/h Level 10

34.61°, 138.15° 1966-09-24 15:10:33

JTWC 157 km/h Level 14

34.61°, 138.11° 1966-09-24 15:01:35

JMA

34.62°, 138.09° 1966-09-24 14:51:55

HKO 144 km/h Level 13

34.64°, 137.99° 1966-09-24 14:53:51

DS824 157 km/h Level 14

34.61°, 138.11° 1966-09-24 15:01:35

TD9636 157 km/h Level 14

35.09°, 138.83° 1966-09-24 15:41:19

TD9635 157 km/h Level 14

34.61°, 138.11° 1966-09-24 15:01:35

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

IDA (1966)

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Advanced Meteorological Indices by Agency Automatically calculated from raw data

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Countries with Direct Landfall

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IDA (1966)

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Weather Agencies (8 sources)

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Wind Intensity Chart

Quick Stats

Agency Data Comparison

Indices Legend

Advanced Meteorological Indices by Agency Automatically calculated from raw data

Advanced Indices Legend

Countries with Direct Landfall

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