This is storm ELINOR that was active in 1983 in the S. Pacific region with maximum winds of 213 km/h.

What was the maximum intensity of the storm?

Max Wind: 213 km/h. Min Pressure: hPa.

storm ELINOR (1983) - Track and intensity details

Name: storm ELINOR
Start: 1983-02-10
End: 1983-03-04
Location: S. Pacific

ELINOR (1983)

Storm Code: 1983042S11158 | Region: S. Pacific
Active from 11/02/1983 to 04/03/1983 (22 days)

185 km/h

1-min Wind (JTWC)

Level 16

204 km/h

10-min Wind (BOM)

Level 17

925 hPa

Min Pressure

5,294 km

Distance

Forecast Agencies

Agency	Max Intensity	Trajectory	Energy	highest_classification
WMO (International)	204	935	101	5,059	144.30	207.65	Level 17 - Super Typhoon
BOM (Australia)	204	935	175	5,093	265.06	392.69	Level 17 - Super Typhoon
TD9636	213	~	171	4,854	64.34	74.00	Level 17 - Super Typhoon
JTWC	185	~	169	5,294	278.34	415.55	Level 16 - Super Typhoon
NEUMANN	204	943	169	5,294	264.24	399.48	Level 17 - Super Typhoon
WELLINGTON	185	925	157	4,543	205.01	279.81	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)

WMO (International)

204

935

101

5,059

144.30

207.65

Level 17 - Super Typhoon

BOM (Australia)

204

935

175

5,093

265.06

392.69

Level 17 - Super Typhoon

TD9636

213

171

4,854

64.34

74.00

Level 17 - Super Typhoon

JTWC

185

169

5,294

278.34

415.55

Level 16 - Super Typhoon

NEUMANN

204

943

169

5,294

264.24

399.48

Level 17 - Super Typhoon

WELLINGTON

185

925

157

4,543

205.01

279.81

Level 16 - Super Typhoon

Advanced Meteorological Indices by Agency Automatically calculated from raw data

WMO (International) RI

Energy
ACE (10⁴ (km/h)²)	144.30	Very High
PDI (10⁶ (km/h)³)	207.65
Intensification / Weakening
Max Wind Gain/Step	+28 km/h
Max Wind Gain/24h	+56 km/h	RI
Max Wind Loss/Step	-19 km/h
Pressure Variation
Max Pressure Drop/Step	-10 hPa
Max Pressure Drop/24h	-28 hPa	Strong
Max Pressure Rise/Step (weakening)	+10 hPa
Movement & Duration
Avg Movement Speed	9.7 km/h
Tracking Time	522h (21.8 days)
Time as TD+ (≥34kt)	534h (22.3d)
Time as Storm+ (≥64kt)	228h (9.5d)
Peak Intensity & Range
Peak Intensity	07:00 25/02/1983 -15.9°N, 154.5°E
Latitude	-22.3°N – -10.6°N (11.7°)
Longitude	147.2°E – 158°E (10.8°)

BOM (Australia)

Energy
ACE (10⁴ (km/h)²)	265.06	Very High
PDI (10⁶ (km/h)³)	392.69
Intensification / Weakening
Max Wind Gain/Step	+15 km/h
Max Wind Gain/24h	+37 km/h	Fast
Max Wind Loss/Step	-19 km/h
Pressure Variation
Max Pressure Drop/Step	-5 hPa
Max Pressure Drop/24h	-18 hPa
Max Pressure Rise/Step (weakening)	+10 hPa
Movement & Duration
Avg Movement Speed	9.8 km/h
Tracking Time	522h (21.8 days)
Time as TD+ (≥34kt)	906h (37.8d)
Time as Storm+ (≥64kt)	450h (18.8d)
Peak Intensity & Range
Peak Intensity	07:00 25/02/1983 -15.8°N, 154.6°E
Latitude	-22°N – -10.6°N (11.4°)
Longitude	147.2°E – 158°E (10.8°)

TD9636 RI

Energy
ACE (10⁴ (km/h)²)	64.34	Very High
PDI (10⁶ (km/h)³)	74.00
Intensification / Weakening
Max Wind Gain/Step	+33 km/h
Max Wind Gain/24h	+130 km/h	RI
Max Wind Loss/Step	-19 km/h
Movement & Duration
Avg Movement Speed	9.5 km/h
Tracking Time	510h (21.3 days)
Time as TD+ (≥34kt)	492h (20.5d)
Time as Storm+ (≥64kt)	48h (2d)
Peak Intensity & Range
Peak Intensity	19:00 02/03/1983 -21.6°N, 150.8°E
Latitude	-22°N – -10.6°N (11.4°)
Longitude	149.2°E – 158°E (8.8°)

JTWC

Energy
ACE (10⁴ (km/h)²)	278.34	Very High
PDI (10⁶ (km/h)³)	415.55
Intensification / Weakening
Max Wind Gain/Step	+9 km/h
Max Wind Gain/24h	+28 km/h
Max Wind Loss/Step	-9 km/h
Movement & Duration
Avg Movement Speed	10.5 km/h
Tracking Time	504h (21 days)
Time as TD+ (≥34kt)	918h (38.3d)
Time as Storm+ (≥64kt)	558h (23.3d)
Peak Intensity & Range
Peak Intensity	07:00 23/02/1983 -16°N, 157.7°E
Latitude	-22.8°N – -10.6°N (12.2°)
Longitude	147.2°E – 157.8°E (10.6°)

NEUMANN

Energy
ACE (10⁴ (km/h)²)	264.24	Very High
PDI (10⁶ (km/h)³)	399.48
Intensification / Weakening
Max Wind Gain/Step	+9 km/h
Max Wind Gain/24h	+37 km/h	Fast
Max Wind Loss/Step	-15 km/h
Pressure Variation
Movement & Duration
Avg Movement Speed	10.5 km/h
Tracking Time	504h (21 days)
Time as TD+ (≥34kt)	870h (36.3d)
Time as Storm+ (≥64kt)	462h (19.3d)
Peak Intensity & Range
Peak Intensity	07:00 26/02/1983 -16°N, 152.1°E
Latitude	-22.8°N – -10.6°N (12.2°)
Longitude	147.2°E – 157.8°E (10.6°)

WELLINGTON

Energy
ACE (10⁴ (km/h)²)	205.01	Very High
PDI (10⁶ (km/h)³)	279.81
Intensification / Weakening
Max Wind Gain/Step	+6 km/h
Max Wind Gain/24h	+19 km/h
Max Wind Loss/Step	-6 km/h
Pressure Variation
Max Pressure Drop/Step	-3 hPa
Max Pressure Drop/24h	-10 hPa
Max Pressure Rise/Step (weakening)	+4 hPa
Movement & Duration
Avg Movement Speed	9.7 km/h
Tracking Time	468h (19.5 days)
Time as TD+ (≥34kt)	906h (37.8d)
Time as Storm+ (≥64kt)	324h (13.5d)
Peak Intensity & Range
Peak Intensity	19:00 24/02/1983 -15.9°N, 155.6°E
Latitude	-22°N – -11°N (11°)
Longitude	149.3°E – 158°E (8.7°)

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

ELINOR (1983)

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Advanced Meteorological Indices by Agency Automatically calculated from raw data

Advanced Indices Legend

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ELINOR

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ELINOR (1983)

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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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