This is storm KATE that was active in 1970 in the W. Pacific region with maximum winds of 269 km/h.

What was the maximum intensity of the storm?

Max Wind: 269 km/h. Min Pressure: hPa.

storm KATE (1970) - Track and intensity details

Name: storm KATE
Start: 1970-10-13
End: 1970-10-26
Location: W. Pacific

KATE (1970)

Storm Code: 1970286N06143 | Region: W. Pacific
Active from 13/10/1970 to 26/10/1970 (13 days)

241 km/h

As measured · 1-min avg

Peak wind · 1-min (JTWC)

Converted ≈ 211 km/h · 10-min avg

Level 17

213 km/h

As measured · 10-min avg

Peak wind · 10-min (HKO)

Level 17

938 hPa

Min Pressure

4,848 km

Distance

Forecast Agencies

Beaufort scale: all winds converted to the 10-min avg standard (WMO). Each agency's original value is shown alongside.

Agency	Max Intensity	Trajectory	Energy	highest_classification
CMA (China)	239 Orig.: 269	938	103	4,848	139.94	280.32	Level 17 - Super Typhoon
WMO (International) (coordinates_only)	~	940	48	4,435	~	~	Undefined
JTWC	211 Orig.: 241	~	91	4,255	124.85	230.33	Level 17 - Super Typhoon
JMA (Japan) (coordinates_only)	~	940	95	4,436	~	~	Undefined
DS824	241	~	91	4,255	162.06	340.79	Level 17 - Super Typhoon
TD9635	241	938	91	4,255	162.06	340.79	Level 17 - Super Typhoon
TD9636	232	~	89	4,210	162.20	340.60	Level 17 - Super Typhoon
HKO (Hong Kong)	213	940	81	3,953	121.38	224.93	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)

239 Orig.: 269

938

103

4,848

139.94

280.32

Level 17 - Super Typhoon

WMO (International)
(coordinates_only)

940

4,435

Undefined

JTWC

211 Orig.: 241

4,255

124.85

230.33

Level 17 - Super Typhoon

JMA (Japan)
(coordinates_only)

940

4,436

Undefined

DS824

241

4,255

162.06

340.79

Level 17 - Super Typhoon

TD9635

241

938

4,255

162.06

340.79

Level 17 - Super Typhoon

TD9636

232

4,210

162.20

340.60

Level 17 - Super Typhoon

HKO (Hong Kong)

213

940

3,953

121.38

224.93

Level 17 - Super Typhoon

Advanced Meteorological Indices by Agency Automatically calculated from raw data

CMA (China) RI

Energy
ACE (10⁴ (km/h)²)	139.94	Very High
PDI (10⁶ (km/h)³)	280.32
Intensification / Weakening
Max Wind Gain/Step	+19 km/h
Max Wind Gain/24h	+126 km/h	RI
Max Wind Loss/Step	-19 km/h
Pressure Variation
Max Pressure Drop/Step	-8 hPa
Max Pressure Drop/24h	-35 hPa	RI
Max Pressure Rise/Step (weakening)	+9 hPa
Movement & Duration
Avg Movement Speed	15.8 km/h
Tracking Time	306h (12.8 days)
Time as TD+ (≥34kt)	273h (11.4d)
Time as Storm+ (≥64kt)	219h (9.1d)
Peak Intensity & Range
Peak Intensity	08:00 17/10/1970 4.6°N, 130.6°E
Latitude	4.2°N – 16.7°N (12.5°)
Longitude	105.2°E – 143.1°E (37.9°)

WMO (International) RI

Pressure Variation
Max Pressure Drop/Step	-15 hPa
Max Pressure Drop/24h	-35 hPa	RI
Max Pressure Rise/Step (weakening)	+15 hPa
Movement & Duration
Avg Movement Speed	15.7 km/h
Tracking Time	282h (11.8 days)
Peak Intensity & Range
Latitude	4.3°N – 16.7°N (12.4°)
Longitude	105.6°E – 140.3°E (34.7°)

JTWC RI

Energy
ACE (10⁴ (km/h)²)	124.85	Very High
PDI (10⁶ (km/h)³)	230.33
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+74 km/h	RI
Max Wind Loss/Step	-37 km/h
Movement & Duration
Avg Movement Speed	15.8 km/h
Tracking Time	270h (11.3 days)
Time as TD+ (≥34kt)	270h (11.3d)
Time as Storm+ (≥64kt)	201h (8.4d)
Peak Intensity & Range
Peak Intensity	14:00 18/10/1970 6°N, 126.3°E
Latitude	4.3°N – 16.7°N (12.4°)
Longitude	107.4°E – 140°E (32.6°)

JMA (Japan) RI

Pressure Variation
Max Pressure Drop/Step	-8 hPa
Max Pressure Drop/24h	-35 hPa	RI
Max Pressure Rise/Step (weakening)	+8 hPa
Movement & Duration
Avg Movement Speed	15.7 km/h
Tracking Time	282h (11.8 days)
Peak Intensity & Range
Latitude	4.1°N – 16.7°N (12.6°)
Longitude	106°E – 140°E (34°)

DS824 RI

Energy
ACE (10⁴ (km/h)²)	162.06	Very High
PDI (10⁶ (km/h)³)	340.79
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+74 km/h	RI
Max Wind Loss/Step	-37 km/h
Movement & Duration
Avg Movement Speed	15.8 km/h
Tracking Time	270h (11.3 days)
Time as TD+ (≥34kt)	270h (11.3d)
Time as Storm+ (≥64kt)	201h (8.4d)
Peak Intensity & Range
Peak Intensity	14:00 18/10/1970 6°N, 126.3°E
Latitude	4.3°N – 16.7°N (12.4°)
Longitude	107.4°E – 140°E (32.6°)

TD9635 RI

Energy
ACE (10⁴ (km/h)²)	162.06	Very High
PDI (10⁶ (km/h)³)	340.79
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+74 km/h	RI
Max Wind Loss/Step	-37 km/h
Pressure Variation
Max Pressure Drop/Step	-6 hPa
Max Pressure Drop/24h	-35 hPa	RI
Max Pressure Rise/Step (weakening)	+7 hPa
Movement & Duration
Avg Movement Speed	15.8 km/h
Tracking Time	270h (11.3 days)
Time as TD+ (≥34kt)	270h (11.3d)
Time as Storm+ (≥64kt)	201h (8.4d)
Peak Intensity & Range
Peak Intensity	14:00 18/10/1970 6°N, 126.3°E
Latitude	4.3°N – 16.7°N (12.4°)
Longitude	107.4°E – 140°E (32.6°)

TD9636 RI

Energy
ACE (10⁴ (km/h)²)	162.20	Very High
PDI (10⁶ (km/h)³)	340.60
Intensification / Weakening
Max Wind Gain/Step	+13 km/h
Max Wind Gain/24h	+74 km/h	RI
Max Wind Loss/Step	-26 km/h
Movement & Duration
Avg Movement Speed	15.9 km/h
Tracking Time	264h (11 days)
Time as TD+ (≥34kt)	264h (11d)
Time as Storm+ (≥64kt)	207h (8.6d)
Peak Intensity & Range
Peak Intensity	08:00 18/10/1970 5.3°N, 127.4°E
Latitude	4.3°N – 16.7°N (12.4°)
Longitude	107.4°E – 139.8°E (32.4°)

HKO (Hong Kong) RI

Energy
ACE (10⁴ (km/h)²)	121.38	Very High
PDI (10⁶ (km/h)³)	224.93
Intensification / Weakening
Max Wind Gain/Step	+9 km/h
Max Wind Gain/24h	+65 km/h	RI
Max Wind Loss/Step	-33 km/h
Pressure Variation
Max Pressure Drop/Step	-5 hPa
Max Pressure Drop/24h	-35 hPa	RI
Max Pressure Rise/Step (weakening)	+10 hPa
Movement & Duration
Avg Movement Speed	16.5 km/h
Tracking Time	240h (10 days)
Time as TD+ (≥34kt)	243h (10.1d)
Time as Storm+ (≥64kt)	177h (7.4d)
Peak Intensity & Range
Peak Intensity	14:00 18/10/1970 6.1°N, 126.1°E
Latitude	4.3°N – 16.8°N (12.5°)
Longitude	107.9°E – 138.1°E (30.2°)

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

🇵🇭 Philippines

WMO

6.56°, 125.50° 1970-10-18 10:46:52

CMA 183 km/h ≈ 163 km/h · 10-min avg Level 14

6.73°, 125.39° 1970-10-18 11:20:05

JTWC 202 km/h ≈ 178 km/h · 10-min avg Level 15

6.71°, 125.38° 1970-10-18 12:05:26

JMA

6.80°, 125.40° 1970-10-18 11:59:07

DS824 202 km/h Level 17

6.71°, 125.38° 1970-10-18 12:05:26

TD9635 202 km/h Level 17

6.71°, 125.38° 1970-10-18 12:05:26

TD9636 204 km/h Level 17

6.71°, 125.38° 1970-10-18 12:05:26

HKO 194 km/h Level 16

6.39°, 125.61° 1970-10-18 08:55:04

🇻🇳 Vietnam

WMO

15.80°, 108.43° 1970-10-25 04:01:31

CMA 85 km/h ≈ 76 km/h · 10-min avg Level 9

15.90°, 108.37° 1970-10-25 03:39:11

JTWC 104 km/h ≈ 91 km/h · 10-min avg Level 10

15.70°, 108.49° 1970-10-25 04:50:23

JMA

15.80°, 108.43° 1970-10-25 03:25:18

DS824 104 km/h Level 11

15.70°, 108.49° 1970-10-25 04:50:23

TD9635 104 km/h Level 11

15.70°, 108.49° 1970-10-25 04:50:23

TD9636 89 km/h Level 10

15.73°, 108.47° 1970-10-25 04:59:21

HKO 98 km/h Level 10

15.70°, 108.49° 1970-10-25 02:26:25

🇱🇦 Laos

WMO

15.80°, 107.17° 1970-10-25 11:36:05

CMA 61 km/h ≈ 54 km/h · 10-min avg Level 7

15.90°, 107.32° 1970-10-25 09:30:24

JMA

15.93°, 107.37° 1970-10-25 09:48:20

🇹🇭 Thailand

WMO

15.70°, 105.62° 1970-10-25 23:49:27

CMA 33 km/h ≈ 30 km/h · 10-min avg Level 5

15.45°, 105.59° 1970-10-25 20:18:41

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

KATE (1970)

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Advanced Meteorological Indices by Agency Automatically calculated from raw data

Advanced Indices Legend

Countries with Direct Landfall

KATE

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KATE (1970)

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Comparison Storms 0

Weather Agencies (8 sources)

Storm Lifecycle Timeline

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Track List (0 points)

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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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