This is storm TILDA that was active in 1964 in the W. Pacific region with maximum winds of 204 km/h.

What was the maximum intensity of the storm?

Max Wind: 204 km/h. Min Pressure: hPa.

storm TILDA (1964) - Track and intensity details

Name: storm TILDA
Start: 1964-09-12
End: 1964-09-25
Location: W. Pacific

TILDA (1964)

Storm Code: 1964256N17141 | Region: W. Pacific
Active from 12/09/1964 to 25/09/1964 (13 days)

204 km/h

1-min Wind (JTWC)

Level 17

180 km/h

10-min Wind (CMA)

Level 15

950 hPa

Min Pressure

5,017 km

Distance

Forecast Agencies

Agency	Max Intensity	Trajectory	Energy	highest_classification
WMO (International) (coordinates_only)	~	965	49	4,837	~	~	Undefined
JMA (Japan) (coordinates_only)	~	965	101	5,017	~	~	Undefined
CMA (China)	180	965	89	4,474	113.39	156.52	Level 15 - Violent Storm
JTWC	204	~	83	3,797	148.82	231.03	Level 17 - Super Typhoon
HKO (Hong Kong)	176	950	79	3,591	118.64	163.06	Level 15 - Violent Storm
DS824	204	~	83	3,797	148.82	231.03	Level 17 - Super Typhoon
TD9635	204	952	75	3,375	145.26	227.91	Level 17 - Super Typhoon
TD9636 (coordinates_only)	~	~	93	3,734	~	~	Undefined

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)

965

4,837

Undefined

JMA (Japan)
(coordinates_only)

965

101

5,017

Undefined

CMA (China)

180

965

4,474

113.39

156.52

Level 15 - Violent Storm

JTWC

204

3,797

148.82

231.03

Level 17 - Super Typhoon

HKO (Hong Kong)

176

950

3,591

118.64

163.06

Level 15 - Violent Storm

DS824

204

3,797

148.82

231.03

Level 17 - Super Typhoon

TD9635

204

952

3,375

145.26

227.91

Level 17 - Super Typhoon

TD9636
(coordinates_only)

3,734

Undefined

Advanced Meteorological Indices by Agency Automatically calculated from raw data

WMO (International)

Pressure Variation
Max Pressure Drop/Step	-8 hPa
Max Pressure Drop/24h	-25 hPa	Strong
Max Pressure Rise/Step (weakening)	+10 hPa
Movement & Duration
Avg Movement Speed	16.8
Tracking Time	288h (12 days)
Peak Intensity & Range
Latitude	16.7°N – 21.3°N (4.6°)
Longitude	100.1°E – 140.6°E (40.5°)

JMA (Japan)

Pressure Variation
Max Pressure Drop/Step	-4 hPa
Max Pressure Drop/24h	-14 hPa
Max Pressure Rise/Step (weakening)	+5 hPa
Movement & Duration
Avg Movement Speed	16.7
Tracking Time	300h (12.5 days)
Peak Intensity & Range
Latitude	16.7°N – 21.3°N (4.6°)
Longitude	98.8°E – 140.6°E (41.8°)

CMA (China) RI

Energy
ACE (10⁴ (km/h)²)	113.39	Very High
PDI (10⁶ (km/h)³)	156.52
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+56 km/h	RI
Max Wind Loss/Step	-19 km/h
Pressure Variation
Max Pressure Drop/Step	-4 hPa
Max Pressure Drop/24h	-14 hPa
Max Pressure Rise/Step (weakening)	+3 hPa
Movement & Duration
Avg Movement Speed	16.9 km/h
Tracking Time	264h (11 days)
Time as TD+ (≥34kt)	438h (18.3d)
Time as Storm+ (≥64kt)	216h (9d)
Peak Intensity & Range
Peak Intensity	14:00 20/09/1964 18.6°N, 112.9°E
Latitude	16.7°N – 21.3°N (4.6°)
Longitude	104°E – 140.6°E (36.6°)

JTWC RI

Energy
ACE (10⁴ (km/h)²)	148.82	Very High
PDI (10⁶ (km/h)³)	231.03
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+56 km/h	RI
Max Wind Loss/Step	-19 km/h
Movement & Duration
Avg Movement Speed	15.4 km/h
Tracking Time	246h (10.3 days)
Time as TD+ (≥34kt)	474h (19.8d)
Time as Storm+ (≥64kt)	276h (11.5d)
Peak Intensity & Range
Peak Intensity	20:00 20/09/1964 18.4°N, 112.4°E
Latitude	17°N – 21.3°N (4.3°)
Longitude	102.6°E – 132.3°E (29.7°)

HKO (Hong Kong) RI

Energy
ACE (10⁴ (km/h)²)	118.64	Very High
PDI (10⁶ (km/h)³)	163.06
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	-5 hPa
Max Pressure Drop/24h	-15 hPa
Max Pressure Rise/Step (weakening)	+8 hPa
Movement & Duration
Avg Movement Speed	15.3 km/h
Tracking Time	234h (9.8 days)
Time as TD+ (≥34kt)	462h (19.3d)
Time as Storm+ (≥64kt)	258h (10.8d)
Peak Intensity & Range
Peak Intensity	20:00 20/09/1964 18.5°N, 112.2°E
Latitude	16.6°N – 21.2°N (4.6°)
Longitude	105°E – 132.3°E (27.3°)

DS824 RI

Energy
ACE (10⁴ (km/h)²)	148.82	Very High
PDI (10⁶ (km/h)³)	231.03
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+56 km/h	RI
Max Wind Loss/Step	-19 km/h
Movement & Duration
Avg Movement Speed	15.4 km/h
Tracking Time	246h (10.3 days)
Time as TD+ (≥34kt)	474h (19.8d)
Time as Storm+ (≥64kt)	276h (11.5d)
Peak Intensity & Range
Peak Intensity	20:00 20/09/1964 18.4°N, 112.4°E
Latitude	17°N – 21.3°N (4.3°)
Longitude	102.6°E – 132.3°E (29.7°)

TD9635 RI

Energy
ACE (10⁴ (km/h)²)	145.26	Very High
PDI (10⁶ (km/h)³)	227.91
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+56 km/h	RI
Max Wind Loss/Step	-19 km/h
Pressure Variation
Max Pressure Drop/Step	-7 hPa
Max Pressure Drop/24h	-17 hPa
Max Pressure Rise/Step (weakening)	+6 hPa
Movement & Duration
Avg Movement Speed	15.2 km/h
Tracking Time	222h (9.3 days)
Time as TD+ (≥34kt)	444h (18.5d)
Time as Storm+ (≥64kt)	276h (11.5d)
Peak Intensity & Range
Peak Intensity	20:00 20/09/1964 18.4°N, 112.4°E
Latitude	17°N – 21.3°N (4.3°)
Longitude	106.3°E – 132.3°E (26°)

TD9636

Movement & Duration
Avg Movement Speed	13.5 km/h
Tracking Time	276h (11.5 days)
Peak Intensity & Range
Latitude	16.8°N – 21.2°N (4.4°)
Longitude	97.7°E – 126.8°E (29.1°)

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

TILDA (1964)

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TILDA (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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