Cyclone Tracy

Tropical cyclone in Australia in 1974

Cyclone Tracy
Cyclone Tracy on Christmas Day 1974
Meteorological history
Formed21 December 1974 (1974-12-21)
Dissipated26 December 1974 (1974-12-26)
Category 4 severe tropical cyclone
10-minute sustained (Aus)
Highest winds175 km/h (110 mph)
Lowest pressure950 hPa (mbar); 28.05 inHg
Category 3-equivalent tropical cyclone
1-minute sustained (SSHWS/JTWC)
Highest winds205 km/h (125 mph)
Overall effects
Fatalities66
Damage$645 million (1974 USD)
Areas affectedTiwi Islands, Northern Territory

Part of the 1974–75 Australian region cyclone season

Severe Tropical Cyclone Tracy was a small tropical cyclone that devastated the city of Darwin, in the Northern Territory of Australia, in December 1974. The small, developing, easterly storm was originally expected to pass clear of the city, but it would turn towards it early on 24 December. After 10:00 p.m. ACST, damage became severe, with wind gusts reaching 217 km/h (117 kn; 135 mph) before instruments failed. The anemometer in Darwin Airport control tower had its needle bent in half by the strength of the gusts.[1]

Residents of Darwin were celebrating Christmas, and they did not immediately acknowledge the emergency, partly because they had been alerted to an earlier cyclone (Selma) which passed west of the city, not affecting it in any way. Additionally, news outlets had only a skeleton crew on duty over the holiday.

Tracy killed 66 people and caused $837 million in damage (1974 AUD, about $7.69 billion in 2022), or about US$5.2 billion (2022 dollars). It destroyed more than 70 percent of Darwin's buildings, including 80 percent of houses.[2][3] It left more than 25,000 out of the 47,000 inhabitants of the city homeless prior to landfall and required the evacuation of over 30,000 people,[4] of whom many never returned. After the storm passed, the city was rebuilt using more stringent standards "to cyclone code". The storm is the second-smallest tropical cyclone on record (in terms of gale-force wind diameter), behind only the North Atlantic's Tropical Storm Marco in 2008.[5]

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
circle Tropical cyclone
square Subtropical cyclone
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression