This is storm WILDA that was active in 1964 in the W. Pacific region with maximum winds of 278 km/h.

What was the maximum intensity of the storm?

Max Wind: 278 km/h. Min Pressure: hPa.

storm WILDA (1964) - Track and intensity details

Name: storm WILDA
Start: 1964-09-16
End: 1964-09-27
Location: W. Pacific

WILDA (1964)

Storm Code: 1964261N12149 | Region: W. Pacific
Active from 17/09/1964 to 27/09/1964 (11 days)

278 km/h

1-min Wind (JTWC)

Level 17

269 km/h

10-min Wind (CMA)

Level 17

895 hPa

Min Pressure

7,906 km

Distance

Forecast Agencies

Agency	Max Intensity	Trajectory	Energy	highest_classification
WMO (International) (coordinates_only)	~	895	41	7,538	~	~	Undefined
JMA (Japan) (coordinates_only)	~	895	83	7,906	~	~	Undefined
CMA (China)	269	906	81	7,568	196.64	429.91	Level 17 - Super Typhoon
JTWC	278	~	61	6,573	215.53	467.39	Level 17 - Super Typhoon
HKO (Hong Kong)	241	905	53	4,799	162.68	315.13	Level 17 - Super Typhoon
DS824	278	~	61	6,573	215.53	467.39	Level 17 - Super Typhoon
TD9635	278	907	47	2,908	202.88	454.43	Level 17 - Super Typhoon
TD9636	278	~	45	2,852	200.07	450.05	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)

WMO (International)
(coordinates_only)

895

7,538

Undefined

JMA (Japan)
(coordinates_only)

895

7,906

Undefined

CMA (China)

269

906

7,568

196.64

429.91

Level 17 - Super Typhoon

JTWC

278

6,573

215.53

467.39

Level 17 - Super Typhoon

HKO (Hong Kong)

241

905

4,799

162.68

315.13

Level 17 - Super Typhoon

DS824

278

6,573

215.53

467.39

Level 17 - Super Typhoon

TD9635

278

907

2,908

202.88

454.43

Level 17 - Super Typhoon

TD9636

278

2,852

200.07

450.05

Level 17 - Super Typhoon

Advanced Meteorological Indices by Agency Automatically calculated from raw data

WMO (International) RI

Pressure Variation
Max Pressure Drop/Step	-20 hPa
Max Pressure Drop/24h	-75 hPa	RI
Max Pressure Rise/Step (weakening)	+25 hPa
Movement & Duration
Avg Movement Speed	31.4
Tracking Time	240h (10 days)
Peak Intensity & Range
Latitude	11.7°N – 51.2°N (39.5°)
Longitude	130.1°E – 177.3°E (47.2°)

JMA (Japan) RI

Pressure Variation
Max Pressure Drop/Step	-10 hPa
Max Pressure Drop/24h	-40 hPa	RI
Max Pressure Rise/Step (weakening)	+13 hPa
Movement & Duration
Avg Movement Speed	32.1
Tracking Time	246h (10.3 days)
Peak Intensity & Range
Latitude	11.7°N – 52°N (40.3°)
Longitude	130°E – 182°E (52°)

CMA (China) RI

Energy
ACE (10⁴ (km/h)²)	196.64	Very High
PDI (10⁶ (km/h)³)	429.91
Intensification / Weakening
Max Wind Gain/Step	+28 km/h
Max Wind Gain/24h	+89 km/h	RI
Max Wind Loss/Step	-19 km/h
Pressure Variation
Max Pressure Drop/Step	-10 hPa
Max Pressure Drop/24h	-38 hPa	RI
Max Pressure Rise/Step (weakening)	+8 hPa
Movement & Duration
Avg Movement Speed	31.5 km/h
Tracking Time	240h (10 days)
Time as TD+ (≥34kt)	300h (12.5d)
Time as Storm+ (≥64kt)	252h (10.5d)
Peak Intensity & Range
Peak Intensity	08:00 21/09/1964 20.5°N, 138.9°E
Latitude	11.7°N – 51°N (39.3°)
Longitude	129.9°E – 177.5°E (47.6°)

JTWC RI

Energy
ACE (10⁴ (km/h)²)	215.53	Very High
PDI (10⁶ (km/h)³)	467.39
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+65 km/h	RI
Max Wind Loss/Step	-24 km/h
Movement & Duration
Avg Movement Speed	36.5 km/h
Tracking Time	180h (7.5 days)
Time as TD+ (≥34kt)	366h (15.3d)
Time as Storm+ (≥64kt)	282h (11.8d)
Peak Intensity & Range
Peak Intensity	14:00 21/09/1964 21.3°N, 137.7°E
Latitude	18.5°N – 51.5°N (33°)
Longitude	130.1°E – 177°E (46.9°)

HKO (Hong Kong) RI

Energy
ACE (10⁴ (km/h)²)	162.68	Very High
PDI (10⁶ (km/h)³)	315.13
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+56 km/h	RI
Max Wind Loss/Step	-15 km/h
Pressure Variation
Max Pressure Drop/Step	-10 hPa
Max Pressure Drop/24h	-40 hPa	RI
Max Pressure Rise/Step (weakening)	+8 hPa
Movement & Duration
Avg Movement Speed	30.8 km/h
Tracking Time	156h (6.5 days)
Time as TD+ (≥34kt)	318h (13.3d)
Time as Storm+ (≥64kt)	246h (10.3d)
Peak Intensity & Range
Peak Intensity	08:00 21/09/1964 20.1°N, 138.9°E
Latitude	18.4°N – 47°N (28.6°)
Longitude	130°E – 152.5°E (22.5°)

DS824 RI

Energy
ACE (10⁴ (km/h)²)	215.53	Very High
PDI (10⁶ (km/h)³)	467.39
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+65 km/h	RI
Max Wind Loss/Step	-24 km/h
Movement & Duration
Avg Movement Speed	36.5 km/h
Tracking Time	180h (7.5 days)
Time as TD+ (≥34kt)	366h (15.3d)
Time as Storm+ (≥64kt)	282h (11.8d)
Peak Intensity & Range
Peak Intensity	14:00 21/09/1964 21.3°N, 137.7°E
Latitude	18.5°N – 51.5°N (33°)
Longitude	130.1°E – 177°E (46.9°)

TD9635 RI

Energy
ACE (10⁴ (km/h)²)	202.88	Very High
PDI (10⁶ (km/h)³)	454.43
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+65 km/h	RI
Max Wind Loss/Step	-19 km/h
Pressure Variation
Max Pressure Drop/Step	-12 hPa
Max Pressure Drop/24h	-39 hPa	RI
Max Pressure Rise/Step (weakening)	+3 hPa
Movement & Duration
Avg Movement Speed	21.1 km/h
Tracking Time	138h (5.8 days)
Time as TD+ (≥34kt)	282h (11.8d)
Time as Storm+ (≥64kt)	264h (11d)
Peak Intensity & Range
Peak Intensity	14:00 21/09/1964 21.3°N, 137.7°E
Latitude	18.5°N – 36.3°N (17.8°)
Longitude	130.1°E – 143.6°E (13.5°)

TD9636 RI

Energy
ACE (10⁴ (km/h)²)	200.07	Very High
PDI (10⁶ (km/h)³)	450.05
Intensification / Weakening
Max Wind Gain/Step	+17 km/h
Max Wind Gain/24h	+65 km/h	RI
Max Wind Loss/Step	-15 km/h
Movement & Duration
Avg Movement Speed	21.6 km/h
Tracking Time	132h (5.5 days)
Time as TD+ (≥34kt)	270h (11.3d)
Time as Storm+ (≥64kt)	264h (11d)
Peak Intensity & Range
Peak Intensity	20:00 21/09/1964 21.8°N, 136.9°E
Latitude	18.8°N – 36.3°N (17.5°)
Longitude	130.1°E – 143.2°E (13.1°)

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

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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

WILDA (1964)

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Advanced Meteorological Indices by Agency Automatically calculated from raw data

Advanced Indices Legend

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WILDA (1964)

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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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