Cyclones can occur any time, but usually November to March; occasional tornadoes; low level of some of the islands make them very sensitive to changes in sea level. The Climate Change in the Pacific Report (2011) describes Kiribati as having a low risk of cyclones;[8] however in March 2015 Kiribati experienced flooding and destruction of seawalls and coastal infrastructure as the result of Cyclone Pam, a Category 5 cyclone that devastated Vanuatu.[9]