1979–80 Australian region cyclone season

Seasonal summary

ImageSize = width:800 height:200 PlotArea = top:10 bottom:80 right:20 left:20 Legend = columns:3 left:30 top:58 columnwidth:270 AlignBars = early DateFormat = dd/mm/yyyy Period = from:01/08/1979 till:30/04/1980 TimeAxis = orientation:horizontal ScaleMinor = grid:black unit:month increment:1 start:01/08/1979

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Backgroundcolors = canvas:canvas

BarData = barset:Hurricane bar:Month

PlotData= barset:Hurricane width:10 align:left fontsize:S shift:(4,-4) anchor:till from:26/08/1979 till:30/08/1979 color:C2 text:"Tony (C2)" from:09/12/1979 till:18/12/1979 color:C5 text:"Viola (C5)" from:23/12/1979 till:02/01/1980 color:C3 text:"Wilf (C3)" from:02/01/1980 till:07/01/1980 color:C1 text: barset:break barset:skip barset:skip barset:skip from:08/01/1980 till:12/01/1980 color:C1 text:"Paul (C1)" from:04/01/1980 till:12/01/1980 color:C5 text:"Amy (C5)" from:18/01/1980 till:27/01/1980 color:C4 text:"Brian (C4)" from:21/01/1980 till:29/01/1980 color:C2 text:"Clara (C2)" barset:break from:27/01/1980 till:04/02/1980 color:C5 text:"Dean (C5)" from:11/02/1980 till:18/02/1980 color:C2 text:"Ruth (C2)" from:12/02/1980 till:18/02/1980 color:C5 text:"Enid (C5)" from:20/02/1980 till:28/02/1980 color:C4 text:"Fred (C4)" from:21/02/1980 till:28/02/1980 color:C4 text:"Simon (C4)" from:09/03/1980 till:11/03/1980 color:C1 text:"Sina (C1)" from:14/03/1980 till:29/03/1980 color:C4 text:"Doris–Gloria (C4)" barset:break from:27/03/1980 till:31/03/1980 color:C2 text:"27P (C2)"

bar:Month width:5 align:center fontsize:S shift:(0,-20) anchor:middle color:canvas from:01/08/1979 till:31/08/1979 text:August from:01/09/1979 till:30/09/1979 text:September from:01/10/1979 till:31/10/1979 text:October from:01/11/1979 till:30/11/1979 text:November from:01/12/1979 till:31/12/1979 text:December from:01/01/1980 till:31/01/1980 text:January from:01/02/1980 till:28/02/1980 text:February from:01/03/1980 till:30/03/1980 text:March from:01/04/1980 till:30/04/1980 text:April TextData = pos:(569,23) text:"(For further details, please see" pos:(713,23) text:"scales)"

Systems

Tropical Cyclone Tony

|10-min winds=50 |1-min winds=45

On 26 August, TCWC Perth reported that a tropical low had developed on a shear line about 1300 km (810 mi) to the northwest of Cocos Island. Over the next couple of days the depression gradually developed further before at 1800 UTC on 27 August, TCWC Perth estimated that it had become a tropical cyclone and named it Tony. During the next couple of days, the system moved towards the west-southwest before on 29 August it reached its peak intensity of 95 km/h and a peak pressure of 990 hPa as it approached the edge of TCWC Perth's area of responsibility. During the next day, Tony moved into the South West Indian Ocean and weakened gradually before it dissipated during 31 August. Neither the Mauritius or Reunion meteorological services monitored Tony as a tropical cyclone while it was active, while it was not included in the JTWC's analysis of the season.

Severe Tropical Cyclone Viola–Claudette

|1-min winds=110 |10-min winds=110 The disturbance from which Viola developed formed on 7 December about 600 km northwest of Cocos. A tropical depression developed on 9 December, moved slowly southwestward, and strengthened into Cyclone Viola two days later. It then moved westward under the influence of an easterly middle level flow north of the sub-tropical ridge, and attained its maximum intensity on 16 December 1979, with a maximum mean wind speed of about 205 km/h and an estimated central pressure of 930 mbar. Early on 18 December, Viola crossed 90º E and was renamed Claudette.

Severe Tropical Cyclone Wilf–Danitza

|1-min winds=70 |10-min winds=70

Tropical Cyclone Paul

|1-min winds=60 |10-min winds=45

On 2 January, the BoM reported that a tropical depression had developed in the Southwest Gulf of Carpentaria. During that day the depression moved towards the southwest and developed early signs of having a cyclonic circulation, however before it could intensify into a tropical cyclone, the system made landfall near the Northern Territory border with Queensland at 135°E. Over the next couple of days the depression weakened slightly, as it moved in a general east-southeast direction across the Carpentaria and Central Coast districts of Queensland. On 7 January, the depression moved out into the Coral Sea just to the south of Sarina with a central pressure of 995 hPa. During that day the depression developed gale-force windspeeds and was named as Paul by TCWC Brisbane. Before later that day, Paul reached its peak intensity as a tropical cyclone with 10-minute sustained windspeeds of 75 km/h and its lowest central pressure of 989 hPa as it moved rapidly towards the southeast. This southeastern movement continued until 1200 UTC on 8 January when it slowed down and started to move to the southwest as it developed a cold core and became extratropical. The extratropical remnants of Paul subsequently lingered in the Australian region and peaked with stronger windspeeds than when it was a tropical cyclone. The US Navy's analysis of this system shows that they would have considered Paul a tropical storm with peak 1-minute sustained windspeeds of 110 km/h. As a tropical depression, Paul forced a strong area of convergence in the moist airstream onto the tropical Queensland coast. As a result of the moisture, very heavy rain caused one of the highest floods of the 20th Century down the Don River through Bowen. In its lower reaches the river changed its course and washed away two homes and caused several million Australian dollars' worth of damage to the market garden industry.

Severe Tropical Cyclone Amy

|1-min winds=140 |10-min winds=115 What would form into Amy began on 3 January 1980 as a collection of clouds located over the Timor Sea, and would drift west-southwest as it reached tropical cyclone status on 5 January. Amy sped towards the south on the 7th, towards Port Hedland. As it approached landfall, it continued to switch direction. Amy made landfall the morning of 10 January about 110km east of Port Headland. Amy passed close to the town of Goldsworthy and caused extensive damage. In total, Amy caused around $25 million in damages. No injuries or deaths were reported. The lowest central pressure was 915 hPa.

Severe Tropical Cyclone Brian

|1-min winds=120 |10-min winds=100

Tropical Cyclone Clara

|1-min winds=60 |10-min winds=60

Severe Tropical Cyclone Dean

|1-min winds=110 |10-min winds=110 Dean was the third tropical cyclone to develop between 19 and 28 January in a persistent monsoonal low pressure trough, extending from northern Australia westward across the Indian Ocean. Late on 26 January, a pre-cyclone cloud cluster and an associated surface low formed near Bathurst Island and slowly moved westward. The system intensified rapidly, and by 28 January, the storm was estimated to have reached tropical cyclone intensity. During the next 36 hours, intensification was slow as Dean moved to the west-southwest at about 20 km/h. Late on 30 January, the speed of movement slowed down as the system turned to the south. Dean continued to intensify as it accelerated towards the coast. It reached peak intensity on 31 January, with winds of 200 km/h, with the lowest atmospheric pressure recorded at 930 hPa. Early on 1 February, Dean made landfall 48 km east of Port Hedland. It weakened slowly over land, eventually dissipating 2 days later.

In Port Hedland, Western Australia, a wind speed of 130 km/h was recorded, with extensive damage also being reported. Goldsworthy, Marble Bar, and Mt. Newman all reported wind damage, but not as severe as Port Hedland. Flooding between Port Hedland and Mt. Newman caused damage to roads and the railway line. Overall, total damage and industrial losses were estimated at about $20 million.

Tropical Cyclone Ruth

|1-min winds=65 |10-min winds=55

Severe Tropical Cyclone Enid

|1-min winds=110 |10-min winds=109 Enid developed near a weak surface low found near Victoria River Downs, Northern Territory on 12 February. The low deepened as it moved westward, and by 15 February, it had a central pressure of 990 hPa. Enid intensified rapidly over the warm waters. It made landfall on 17 February 25 km west of Wallal, Western Australia, with its central pressure estimated to 930 hPa.

Significant damage to windmills and buildings occurred at Wallal. Cattle worth over $200,000 drowned in the ocean. At Shay Gap, Western Australia, severe damage to blocks of flats and houses, which were unroofed, was observed. No deaths were reported, but minor injuries were sustained. 115 mm of rain was reported at Bonney Downs, Western Australia, 113 mm at Marble Bar, Western Australia, and 99 mm at Newman, Western Australia. Wind gusts up to 200 km/h are estimated to have occurred near Wallal.

Severe Tropical Cyclone Fred

|1-min winds=120 |10-min winds=105

On 19 February, TCWC Perth reported that a tropical depression had developed out of an active area of convection that was associated with a monsoonal shear line about midway between the Cocos and Christmas Islands.

Fred developed from an active area of convection associated with the monsoon shear line about midway between Cocos and Christmas Islands late on 19 February 1980. It reached tropical cyclone strength early on 21 February 1980 and attained its maximum intensity on the afternoon of 24 February 1980 when the central pressure was estimated to be near 930 hPa. Despite the small size of the cyclone it maintained this intensity with minor fluctuations until about 1200 UTC 25 February 1980. Early on 26 February the direction of movement changed from southwestward to southward as Fred came under the influence of a northwesterly upper-level flow. It weakened rapidly as it moved into a strong ridge of high pressure located at about latitude 33°S.

Severe Tropical Cyclone Simon

|1-min winds=100 |10-min winds=90

Severe Tropical Cyclone Doris–Gloria

|1-min winds=110 |10-min winds=90

Unnamed Tropical Cyclone (27P)

|1-min winds=60 |10-min winds=40

On 27 March, TCWC Darwin reported that a tropical depression had developed in the Gulf of Carpentaria about 300 km (190 mi) to the southwest of Wallaby island. During that day the system intensified enough to produce localized and intermittent gale-force winds, over the northeast Arnhem land as it moved into the Arafura sea. Early on 28 March, TCWC Darwin reported that despite the depression having reached cyclone intensity of 65 km/h, it was not a tropical cyclone as the system had not developed a "deep convective warm cored structure". However, during post storm analysis TCWC Darwin reported that the depression had become a tropical cyclone at 0000 UTC (0800 WST) on 28 March. During 28 March, the system moved towards the north, before during the next day as the cyclone turned towards the west and moved into the Arafura sea it reached its lowest central pressure of 998 hPa. As the system moved further into the Arafura sea, a very strong amount of vertical windshear and an intrusion of dry air made the cyclone rapidly weaken into a tropical depression before the residual depression dissipated on 31 March just to the north of the Cobourg peninsular. The Cyclone caused no deaths and only minor damage was reported to have occurred.

Other systems

During 9 March the precursor tropical low to Severe Tropical Cyclone Sina, moved south-westwards into the region of the South Pacific. The system subsequently developed into a tropical cyclone and was named Sina by the BoM, before it moved south-eastwards out of the region early the next day.

Seasonal effects

|- | Tony || || bgcolor=#| || bgcolor=#| || bgcolor=#| || None || None || None || None || |- | Simon || || bgcolor=#|Category 4 severe tropical cyclone || bgcolor=#|165 km/h || bgcolor=#|950 hPa || Queensland, New Zealand || || || || |}

References

References

1. Unattributed. (2010). "Tropical Cyclone Tony 1979-80". Bureau of Meteorology.
2. Donque, G.. "La saison cyclonique 1979-1980 a Madagascar". Direction de la Meteorologie Service de La Réunion.
3. Bath, Michael. (23 July 2010). "Southern Hemisphere Tropical Cyclone Season 1979-1980". Australian Severe Weather.
4. "Severe Tropical Cyclone Viola". [[Bureau of Meteorology]].
5. Unattributed. (2010). "Tropical Cyclone Paul 1979-80". Bureau of Meteorology.
6. "Wayback Machine".
7. "Severe Tropical Cyclone Dean".
8. "Severe Tropical Cyclone Enid".
9. "Tropical Cyclone Fred". Australian Government [[Bureau of Meteorology]].
10. Crane, Geoff D. "The Australian tropical cyclone season 1979–80". Australian Meteorological Magazine.
11. (2010). "Severe Tropical Cyclone Simon". Bureau of Meteorology.