Timeline of the 1990–91 South Pacific cyclone season

Last updated

Timeline of the
1990-91 South Pacific cyclone season
1990-1991 South Pacific cyclone season summary.png
Season summary map
Season boundaries
First system formedNovember 23, 1990
Last system dissipatedMay 19, 1991
Strongest system
Maximum winds140 km/h (85 mph)
(10-minute sustained)
Lowest pressure960 hPa (mbar)
Longest lasting system
Name Sina
Duration11 days
Storm articles
Other years
1990–91 2003–04

The 1990–91 South Pacific cyclone season was a below-average season; only two tropical cyclones occurred within the South Pacific to the east of 160°E. [A 1] The season officially ran from November 1, 1990, to April 30, 1991, but the first disturbance of the season formed on November 23 and the last dissipated on May 19. [A 2] This is the period of the year when most tropical cyclones form within the South Pacific Ocean. [1] During the season, no one was killed from tropical disturbances within the South Pacific. However, six people were killed by Cyclone Joy when it made landfall on Australia. The only tropical cyclone to cause any damage while within this basin was Sina, which caused at least

Contents

Within the South Pacific, tropical cyclones were monitored by the Tropical Cyclone Warning Centers (TCWC) at the Fiji Meteorological Service in Nadi and by the Meteorological Service of New Zealand Limited in Wellington. Tropical cyclones that moved to the west of 160°E were monitored as a part of the Australian region by the Australian Bureau of Meteorology. Both the United States Joint Typhoon Warning Center (JTWC) and the Naval Western Oceanography Center (NWOC) issued unofficial warnings within the southern Pacific. The JTWC issued warnings between 160°E and the International Date Line, while the NWOC issued warnings for tropical cyclones forming between the International Date Line and the coasts of the Americas. Both the JTWC and the NWOC-designated tropical cyclones with a number and a P suffix with numbers assigned in numerical order to tropical cyclones developing within the whole of the Southern Hemisphere. TCWC Nadi and TCWC Wellington both use the Australian Tropical Cyclone Intensity Scale, and measure windspeeds over ten minutes, while the JTWC and the NWOC measured sustained winds over one minute and use the Saffir–Simpson Hurricane Scale.

This timeline includes information from post-storm reviews by TCWC Nadi, TCWC Wellington, the JTWC, and the NWOC. It documents tropical cyclone formations, strengthenings, weakenings, landfalls, extratropical transitions, and dissipations during the season. Reports among warning centers often differ; therefore, information from all three agencies has been included.

Seasonal summary

Cyclone JoyCyclone SinaTropical cyclone scales#Comparisons across basinsTimeline of the 1990-91 South Pacific cyclone season

As a result of the South Pacific Convergence Zone being both weaker and located further to the north than in previous seasons and the Madden–Julian oscillations being weaker and less regular defined than in previous tropical cyclone seasons. [2] As a result, only three tropical cyclones occurred within the South Pacific basin between 160°E and 120°W, which made the season one of the least active on record. [2] [3] The first tropical cyclone was first noted as a shallow depression on November 20 before it was named Sina on November 24 after it had intensified into a tropical cyclone. [4] After peaking as a category three severe tropical cyclone on the Australian tropical cyclone intensity scale, Sina affected Fiji, Tonga, Niue and the Southern Cook Islands with total damage estimated at over

The basin then remained quiet until March when three significant tropical depressions including 15 and 16P were observed within the Coral Sea/Australian region, which did not develop into tropical cyclones but were subject to gale warnings. [6] 15P was first noted on March 3, while it was located about 900 km (560 mi) to the east of the Solomon Islands and over the next couple of days subsequently moved south-westwards and out of the South Pacific basin during the next day. [7] 16P was first noted on March 14, while located about 300 km (185 mi) to the southeast of Honiara in the Solomon Islands. [8] [A 3] Over the next couple of days the system moved towards the south-east before the JTWC designated the system 16P and initiated advisories on it during March 18 after it had moved into the South Pacific basin. [9] Over the next couple of days the system, moved towards the south-southeast before it turned towards the southwest and passed over New Caledonia on March 20, before it was last noted during the next day moving out of the basin. [8] The final tropical cyclone of the season, Lisa, moved into the Southern Pacific on May 11 at its peak intensity of 110 km/h (75 mph). [2] [5] During the next day as the storm moved towards the subtropical jet, Lisa rapidly weakened into a tropical depression before passing over Anatom Island without causing any significant damage. [2] After the season both the names Sina and Joy were retired from the naming lists for the region, while it was determined that a weak gale force tropical cyclone had affected Tonga between December 14–17. [1] [3] [10]

Timeline

November

November 1
November 24
November 25
November 26
Track map of Severe Tropical Cyclone Sina Sina 1990 track.png
Track map of Severe Tropical Cyclone Sina
November 27
November 28
November 29
November 30

December

Track map of Severe Tropical Cyclone Joy (06P) Joy 1990 track.png
Track map of Severe Tropical Cyclone Joy (06P)
December 1
December 4
December 15
December 17

January and February

March

March 15
March 21

April

April 30

May

Track map of Tropical Cyclone Lisa (21P) Lisa 1991 track.png
Track map of Tropical Cyclone Lisa (21P)
May 11
May 12
May 19

Notes

  1. An average season has nine tropical cyclones, about half of which become severe tropical cyclones.
  2. TCWC Nadi warned on systems in the South Pacific, which is located from the equator to 25°S and from 160°E to 120°W. TCWC Wellington warns on systems from 25°S to 40°S and from 160°E to 120°W
  3. The figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (miles, or kilometers), following the convention used in the Fiji Meteorological Service's operational products for each storm. All other units are rounded to the nearest digit.
  4. UTC stands for Coordinated Universal Time.
  5. FST stands for Fiji Standard Time, which is equivalent to UTC+12.
  6. The figures for maximum sustained winds and position estimates are rounded to the nearest 5 units (knots, miles, or kilometers), following the convention used in the Fiji Meteorological Service's operational products for each storm. All other units are rounded to the nearest digit.

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