Tropical Depression Isa (1970)
Tropical Depression Isa peaked at 25 kt in the South Pacific between April 14, 1970 and April 19, 1970, with a lowest pressure of 990 mb, and made landfall.
Track and intensity
The whole track of Tropical Depression Isa, colored by strength, with the other storms of the 1970 season in the same basin behind it, and its wind and pressure hour by hour. Every fix is in the track table below.
The storm
- Basin
- South Pacific
- Dates
- April 14, 1970 to April 19, 1970
- Peak strength
- Tropical Depression, 25 kt (29 mph)
- Lowest pressure
- 990 mb (29.23 inHg)
- Landfall
- Yes
- Accumulated cyclone energy
- 0.0
- Identifier
- SH311970
Deaths and damage
No source this site reads publishes a machine-readable casualty or damage figure for a storm of this era. The National Hurricane Center’s season tables begin in 1995 and carry deaths and damage only from 2005 in the Atlantic and 2020 in both basins; the US Storm Events record begins in 1996.
Track
| Time (UTC) | Position | Wind | Pressure | Status |
|---|---|---|---|---|
| Apr 14, 00:00 | 9.6S 163.9E | 10 kt | 990 mb | Tropical storm |
| Apr 14, 06:00 | 9.7S 163.2E | 15 kt | Tropical storm | |
| Apr 14, 12:00 | 9.8S 162.5E | 20 kt | 990 mb | Tropical storm |
| Apr 14, 18:00 | 9.9S 161.8E | 25 kt | Tropical storm | |
| Apr 15, 00:00 | 10.0S 161.1E | 25 kt | 990 mb | Tropical storm |
| Apr 15, 06:00 | 9.5S 160.8E | 20 kt | Tropical storm | |
| Apr 15, 12:00 | 8.9S 160.7E | 20 kt | 990 mb | Tropical storm |
| Apr 15, 18:00 | 8.5S 160.5E | 15 kt | Tropical storm | |
| Apr 16, 00:00 | 8.2S 160.0E | 15 kt | Tropical storm | |
| Apr 16, 06:00 | 8.0S 159.3E | 20 kt | Tropical storm | |
| Apr 16, 12:00 | 7.9S 158.7E | 20 kt | Tropical storm | |
| Apr 16, 18:00 | 7.8S 158.0E | 20 kt | Tropical storm | |
| Apr 17, 00:00 | 7.8S 157.4E | 20 kt | Tropical storm | |
| Apr 17, 06:00 | 8.0S 156.5E | 20 kt | Tropical storm | |
| Apr 17, 12:00 | 8.2S 155.6E | 20 kt | Tropical storm | |
| Apr 17, 18:00 | 8.6S 154.8E | 15 kt | Tropical storm | |
| Apr 18, 00:00 | 8.8S 154.2E | 15 kt | Tropical storm | |
| Apr 18, 06:00 | 8.9S 154.0E | 15 kt | Tropical storm | |
| Apr 18, 12:00 | 9.0S 154.0E | 15 kt | Tropical storm | |
| Apr 18, 18:00 | 9.3S 154.2E | 15 kt | Tropical storm | |
| Apr 19, 00:00 | 9.5S 154.7E | Tropical storm |
Other South Pacific storms of 1970
- Unnamed tropical depressionSouth Pacific · 1970
- Cyclone AdaSouth Pacific · 1970
- Unnamed tropical depressionSouth Pacific · 1970
- Unnamed tropical depressionSouth Pacific · 1970
- Unnamed tropical depressionSouth Pacific · 1970
- Tropical Storm DawnSouth Pacific · 1970
- Tropical Storm FlorenceSouth Pacific · 1970
- Cyclone DollySouth Pacific · 1970
- Unnamed tropical depressionSouth Pacific · 1970
- Cyclone EmmaSouth Pacific · 1970
- Unnamed tropical depressionSouth Pacific · 1970
- Unnamed tropical depressionSouth Pacific · 1970
- Tropical Depression CindySouth Pacific · 1970
- Unnamed tropical depressionSouth Pacific · 1970
- Tropical Storm GillianSouth Pacific · 1970
- Tropical Storm HelenSouth Pacific · 1970
- Unnamed tropical depressionSouth Pacific · 1970
What this means
A best track is the record a warning agency settles on after the storm, not what it said at the time: position, maximum sustained wind and central pressure every six hours, revised against every observation that came in later. Category is the Saffir-Simpson scale, which runs from Category 1 at 64 kt to Category 5 at 137 kt and reads wind only, so it says nothing about surge or rain. Accumulated cyclone energy adds up the square of the wind through the storm's life, so it counts strength and duration together.
Sources
Storm history from NOAA NCEI’s International Best Track Archive for Climate Stewardship (IBTrACS), which merges the official best track of every warning agency. Live storms, cones, watches and warnings from the National Hurricane Center and the Central Pacific Hurricane Center. Archived radar from NOAA’s Level II archive.