This is storm UNNAMED that was active in 1964 in the W. Pacific region with maximum winds of 46 km/h.

What was the maximum intensity of the storm?

Max Wind: 46 km/h. Min Pressure: hPa.

🌀

Loading information...

Initializing storm detail page...

Storm Detail 1964

UNNAMED (1964)

Name: storm UNNAMED
Start: 1964-09-02
End: 1964-09-03
Location: W. Pacific

Storm Code: 1964246N16144 | Region: W. Pacific
Active from 02/09/1964 to 03/09/1964 (1 days)

46 km/h

10-min Wind (HKO)

Level 6

1006 hPa

Min Pressure

167 km

Distance

Forecast Agencies

Notification

Remove all compare storms

Are you sure you want to remove all 0 comparison storms?

Comparison Storms 0

Click "Add" button to add storms to comparison list, or click compare button in year list page.

Weather Agencies (3 sources)

JTWC N/A

HKO (Hong Kong) 46 km/h

DS824 N/A

Export GIF/Video

Create storm track GIF or video with sea surface temperature (SST) and satellite imagery.

Playback:

km/s 0 / 0

Storm Structure

UNNAMED

Time ---

Coordinates ---

Wind Speed ---

Pressure ---

UNNAMED

Time ---

Coordinates ---

Wind Speed ---

Pressure ---

Track List (0 points)

#	Time (GMT+7)	Position	Wind (km/h)	Pressure	Level

Wind Intensity Chart

JTWC HKO DS824

No data

Selected agencies have no data for this chart.

Quick Stats

46 km/h

Max Wind

1006 hPa

Min Pressure

18h

Activity Duration

Forecast Agencies

Agency Data Comparison

JTWC

N/A Max Wind

N/A Min Pressure

5 Measurements

HKO (Hong Kong)

46 km/h Max Wind

1006 hPa Min Pressure

7 Measurements

DS824

N/A Max Wind

N/A Min Pressure

5 Measurements

Agency	Max Intensity		Trajectory		Energy		highest_classification
Agency	Max Wind (km/h)	Min Pressure (hPa)	Number of points	Distance (km)	ACE (10⁴ (km/h)²)	PDI (10⁶ (km/h)³)	highest_classification
JTWC (coordinates_only)	~	~	5	105	~	~	Undefined
HKO (Hong Kong)	46	1006	7	167	0.00	0.00	Level 6 - TD
DS824 (coordinates_only)	~	~	5	105	~	~	Undefined

Indices Legend

Max Wind (kt/km/h): Maximum wind speed by agency

Min Pressure: Lowest central pressure

Number of points: Number of observation points in track

Distance: Total track distance traveled

ACE: Accumulated Cyclone Energy

PDI: Power Dissipation Index

Advanced Meteorological Indices by Agency Automatically calculated from raw data

JTWC

Movement & Duration
Avg Movement Speed	8.8
Tracking Time	12h (0.5 days)
Peak Intensity & Range
Latitude	16.1°N – 17°N (0.9°)
Longitude	144.4°E – 144.6°E (0.2°)

HKO (Hong Kong)

Energy
ACE (10⁴ (km/h)²)	0.00
PDI (10⁶ (km/h)³)	0.00
Intensification / Weakening
Pressure Variation
Movement & Duration
Avg Movement Speed	9.3
Tracking Time	18h (0.8 days)
Peak Intensity & Range
Peak Intensity	14:00 02/09/1964 16.1°N, 144.3°E
Latitude	16.1°N – 17.5°N (1.4°)
Longitude	144.3°E – 144.8°E (0.5°)

DS824

Movement & Duration
Avg Movement Speed	8.8
Tracking Time	12h (0.5 days)
Peak Intensity & Range
Latitude	16.1°N – 17°N (0.9°)
Longitude	144.4°E – 144.6°E (0.2°)

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

Storm did not make landfall

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

Searching index

---

Agency

---

From Year

To year

Tolerance Default

Auto

Auto: use default tolerance for each index type

GEO FILTER (Optional)

Filter by ocean

W. Pacific E. Pacific N. Atlantic N. Indian S. Indian S. Pacific S. Atlantic

Empty = all oceans

Landfall in country

Loading country list...

Empty = no country filter. Select to show only storms that made landfall in the selected country.

Geographic filters will narrow results - only showing storms that meet all selected conditions.

Select an index to search

Replay:

km/s 0 / 0

0/0

UNNAMED

Time ---

Coordinates ---

Wind Speed ---

Wind Level ---

Pressure ---

Searching index

---

Agency

---

From year

From Year

Tolerance Default

Auto

Auto: use default tolerance for each index type

Filter by region

Ocean

W.Pacific E.Pacific N.Atlantic N.Indian S.Indian S.Pacific

Landfall in country

Loading country list...

Click "Search" to find similar storms

User Guide

UNNAMED (1964)

Share

Storm Structure

Comparison Storms 0

Weather Agencies (3 sources)

Export GIF/Video

Track List (0 points)

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

Display Settings

UNNAMED

Storm Structure