Cyclone Pam

Category 5 South Pacific cyclone in 2015

Severe Tropical Cyclone Pam
Pam nearing peak intensity over Vanuatu, on 13 March
Meteorological history
Formed6 March 2015 (6 March 2015)
Extratropical15 March 2015
Dissipated20 March 2015 (20 March 2015)
Category 5 severe tropical cyclone
10-minute sustained (FMS)
Highest winds250 km/h (155 mph)
Lowest pressure896 hPa (mbar); 26.46 inHg
Third-lowest in South Pacific basin, Fourth-lowest in Southern Hemisphere
Category 5-equivalent tropical cyclone
1-minute sustained (SSHWS)
Highest winds280 km/h (175 mph)
Lowest pressure911 hPa (mbar); 26.90 inHg
Overall effects
Fatalities15–16 total
Damage$692 million
(Costliest in Vanuatu history)[1]
Areas affectedFiji, Kiribati, Solomon Islands, Tuvalu, Vanuatu, New Caledonia, New Zealand
IBTrACSEdit this at Wikidata

Part of the 2014–15 South Pacific cyclone season

Severe Tropical Cyclone Pam was the second most intense tropical cyclone of the South Pacific Ocean in terms of sustained winds and is regarded as one of the worst natural disasters in the history of Vanuatu.[2] A total of 15–16 people lost their lives either directly or indirectly as a result of Pam with many others injured. The storm's impacts were also felt, albeit to a lesser extent, to other islands in the South Pacific, most notably the Solomon Islands, Tuvalu, and New Zealand. Pam is the third most intense storm of the South Pacific Ocean according to pressure, after Winston of 2016 and Zoe of 2002. It is also the second most intense tropical cyclone in 2015, only behind Hurricane Patricia. In addition, Pam is tied with Orson, Monica, Marcus and Fantala for having the second strongest ten-minute maximum sustained winds in the Southern Hemisphere. Thousands of homes, schools and buildings were damaged or destroyed, with an estimated 3,300 people displaced as a result.

Pam formed on 6 March, east of the Solomon Islands and tracked slowly in a generally southward direction, slowly intensifying as it did so. Two days later, the disturbance reached tropical cyclone intensity and, over subsequent days, Pam gradually strengthened before reaching Category 5 cyclone status on both the Australian and Saffir–Simpson scales on 12 March. The next day, Pam's sustained winds peaked at 250 km/h (155 mph) as the storm moved through Vanuatu, passing near several constituent islands and making direct hits on others. On 14 March, Pam's winds began to slowly weaken, but its pressure dropped further to a minimum of 896 mbar (hPa; 26.46 inHg) before rising shortly afterwards. Over the next few days, the cyclone's weakening accelerated as it moved poleward. On 15 March, Pam passed northeast of New Zealand before transitioning into an extratropical cyclone that same day.

Early in Pam's history, a damaging storm surge was felt in Tuvalu, forcing a state of emergency declaration after 45 percent of the nation's residents were displaced. Torrential rainfall occurred in the southeastern Solomon Islands, particularly in the Santa Cruz Islands. In Vanuatu, all emergency centres were activated and relief personnel were put on standby with Pam assessed as having the potential to be one of the nation's worst tropical cyclones. Catastrophic damage occurred as the storm moved through the archipelago, particularly in Efate, the location of the Ni-Vanuatu capital of Port Vila; and the Tafea islands of Erromango and Tanna. The cyclone crippled Vanuatu's infrastructure: an estimated 90 percent of the nation's buildings were impacted by the storm's effects, telecommunications were paralysed, and water shortages continue to plague the small nation. Pam later brought heavy winds and rough surf to New Zealand's North Island during its weakening stages.

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