1980–81 South-West Indian Ocean cyclone season

Season summary

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PlotData= barset:Hurricane width:11 align:left fontsize:S shift:(4,-4) anchor:till from:09/11/1980 till:14/11/1980 color:TC text:"Alice-Adelaide (TC)" from:22/11/1980 till:01/12/1980 color:TS text:"Bettina (MTS)" from:24/11/1980 till:09/12/1980 color:TC text:"Bert-Christelle (TC)" from:17/12/1980 till:19/12/1980 color:TS text:"Diana (MTS)" from:28/12/1980 till:01/01/1981 color:TS text:"Edwige (MTS)" from:03/01/1981 till:11/01/1981 color:VI text:"Florine (VITC)" from:14/01/1981 till:16/01/1981 color:TS text:"Gaelle (MTS)" from:28/01/1981 till:06/02/1981 color:TS text:"Helyette (MTS)" barset:break from:16/02/1981 till:25/02/1981 color:ST text:"Iadine (STS)" from:01/03/1981 till:11/03/1981 color:ST text:"Johanne (STS)" from:28/03/1981 till:08/04/1981 color:TS text:"Klara (MTS)" from:06/04/1981 till:16/04/1981 color:TS text:"Lisa (MTS)"

bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/11/1980 till:01/12/1980 text:November from:01/12/1980 till:31/12/1980 text:December from:01/01/1981 till:31/01/1981 text:January from:01/02/1981 till:28/02/1981 text:February from:01/03/1981 till:31/03/1981 text:March from:01/04/1981 till:30/04/1981 text:April

TextData = pos:(525,23) text:"(For further details, please see" pos:(672,23) text:"scales)"

Systems

Intense Tropical Cyclone Alice–Adelaide

| 10-min winds = 65 | 1-min winds = 110 On November 3, a low-pressure area developed off the southwest coast of Sumatra in the Australian basin. The BoM upgraded the low to Tropical Cyclone Alice two days later, which was intensifying while moving west-southwestward, steered by the subtropical ridge to its south. Alice attained a peak intensity of 180 km/h in the Australian basin on November 7. While in the region, the cyclone's high waves capsized two boats. The crew of the Sing Long No. 21 escaped in two life rafts; a freighter rescued one raft, but the other was lost, with 12 crew members aboard.

Cyclone Alice crossed 90º E on November 9, and 85º E a day later, whereupon the MMS renamed the storm as Adelaide, estimating winds of at least 120 km/h. The JTWC estimated maximum sustained winds of 205 km/h at that time. Adelaide soon began a weakening trend, falling below tropical cyclone status on November 11. A day later, the storm turned to the west-northwest, steered by a ridge to the south. Adelaide weakened to a tropical depression on November 13, and was no longer classifiable a tropical cyclone by a day later.

Moderate Tropical Storm Bettina

| 10-min winds = 45 | 1-min winds = 50 Bettina formed on November 22, over the central Indian Ocean. It moved south-southwestward and reached a peak intensity of 50 kn on November 26. It made landfall as a tropical storm over Mozambique and weakened shortly after on December 1.

Tropical Cyclone Bert–Christelle

| 10-min winds = 75 | 1-min winds = 80 Formed on November 24 over the open Indian Ocean it moved in a mostly southwest direction, though it did curve a few times. It reached a peak intensity of 80 kn and a pressure of 965 hPa on November 29. Christelle made landfall on Madagascar on December 9 as a tropical depression.

Moderate Tropical Storm Diana

| 10-min winds = 35 | 1-min winds = 35 Diana existed from December 17 to December 19.

Moderate Tropical Storm Edwige

| 10-min winds = 35 | 1-min winds = 35 Edwige brushed Madagascar.

Very Intense Tropical Cyclone Florine

| 10-min winds = 120 | 1-min winds = 105 Toward the beginning of January, the ITCZ was active to the northeast of Madagascar, spawning a circulation east of Agalega that became a depression on January 3. On the next day, the system was named Florine. Steered between a ridge to its northwest and northeast, the system moved erratically until January 5, when Florine began a steady movement to the south and later southwest. The change in trajectory was because the ridge to Florine's northeast had weakened. On January 6, the intensifying storm passed just west of St. Brandon, where a station recorded sustained winds of 115 km/h and gusts of 148 km/h. A day later, the outer eyewall of Florine moved across Réunion island, while the center of the eye passed 25 km east of Sainte-Rose. Roland Garros Airport recorded a minimum pressure of 935 mbar, the lowest on the island. A landfall was spared due to a shift in trajectory to the south-southeast caused by a passing cold front. Also around this time, the cyclone reached its peak intensity according to the JTWC; the agency estimated peak winds of 195 km/h, based on a Dvorak rating of 5.5. The MFR estimated peak 10 minute winds of 220 km/h. Florine weakened as it accelerated ahead of a polar trough, and was no classifiable as a tropical cyclone on January 10. The remnants passed west of Île Amsterdam on the next day and continued southeastward.

Florine's close passage to Réunion caused injuries to two people. The high winds, peaking at 234 km/h at Plaine des Cafres, affected the island alongside heavy rainfall. Precipitation totals ranged from 100 mm near the coast to 1161 mm at Foc-Foc. High tides reached 5.2 m at the coast in La Possession. Cyclone Florine destroyed crops and 95 houses. It caused injuries to two people and left around 500 people homeless. The storm knocked down 2000 phone lines and caused disruptions to the power network. Cilaos and Salazie became isolated during the storm, requiring assistance by helicopter. In nearby Mauritius, winds peaked at 137 km/h.

Moderate Tropical Storm Gaelle

| 10-min winds = 40 | 1-min winds = 45 Gaelle existed from January 14 to January 18.

Moderate Tropical Storm Helyette

| 10-min winds = 40 | 1-min winds = 45 On January 31, Tropical Depression Helyette passed north of Rodrigues, and the next day moved over Mauritius and just southeast of Réunion. The highest wind gust was 121 km/h at Fort William on Mauritius. Helyette made landfall in Madagascar.

Severe Tropical Storm Iadine

| 10-min winds = 50 | 1-min winds = 55 Iadine also made landfall in Madagascar.

Severe Tropical Storm Johanne

| 10-min winds = 60 | 1-min winds = 80 Johanne existed from March 1 to March 11. On March 6, Tropical Storm Johanne passed between Réunion and Mauritius while passing southeastward, with respective island rainfall totals of 316 and. The highest wind gust was 124 km/h at Mon Desert Alma on Mauritius.

Moderate Tropical Storm Klara

| 10-min winds = 40 | 1-min winds = 40 Klara existed from March 28 to April 8.

Moderate Tropical Storm Lisa

| 10-min winds = 40 | 1-min winds = 40 Lisa existed from April 6 to April 16.

For several days, Lisa looped to the north of the Mascarene Islands, coming within 200 km of Mauritius on April 9. For several the storm dropped rainfall on the islands, reaching 398 mm in Mauritius and 445 mm on Réunion. Flooding caused road damage in the latter island.

References

References

1. "Tropical Cyclone Alice". Australian Bureau of Meteorology.
2. La Météorlogie, Service de la Réunion. "La Saison Cyclonique 1980-1981 A Madagascar". Madagascar: Revue de Géographie.
3. "Donnes de Bemany". Météo-France.
4. Kenneth R. Knapp. (2010). ["1980 Adelaide (1980308S05102)"]({{IBTRACS url). Bulletin of the American Meteorological Society.
5. (1996). ["Tropical Cyclone Adelaide, 9–14 November"]({{GTECCA url). National Climatic Data Center.
6. (1996). ["Tropical Cyclone Florine 4–10 January"]({{GTECCA url). National Climatic Data Center.
7. Kenneth R. Knapp. (2010). ["1981 Florine (1981003S11059)"]({{IBTRACS url). Bulletin of the American Meteorological Society.
8. John W. Diercks. "Forecast Verification and Reconnaissance Data for Southern Hemisphere Tropical Cyclones (July 1980 through June 1982)". Joint Typhoon Warning Center.
9. (1996). ["Tropical Cyclone Helyette, 28 January-4 February"]({{GTECCA url). National Climatic Data Center.
10. (1996). ["Tropical Depression Johanne, 1–10 March"]({{GTECCA url). National Climatic Data Center.
11. (1996). ["Tropical Depression Lisa, 6–14 April"]({{GTECCA url). National Climatic Data Center.