In October of 2005, Florida experienced an unprecedented Halloween scare coming in the form of the freak Hurricane Wilma.

At one point, Wilma held the record for the most intense storm ever recorded but was supposed to dissipate before hitting the peninsula. However, like a true Halloween ghost, Wilma had its own plans and wreaked havoc across the northeastern Yucatan Peninsula of Mexico, Haiti, Cuba, and South Florida.

Wilma became the first hurricane to receive a “W” letter name, after a year of continuous storms including the devastating Hurricanes Dennis and Katrina. What began as a tropical depression, or low-pressure region with the potential of turning into a stronger storm, developed into Tropical Storm Wilma on October 17th 2005.The storm continued to rapidly grow in size during the next 24 hours until reaching the level of a Category 5 Hurricane.

Hurricane Wilma was at its strongest on October 19th, then diminished slightly in intensity before striking Mexico as a Category 4 hurricane. Mexico received winds up to 241 km/h (150 mph) and significant damages which particularly affected the agricultural and tourist industries.

The Yucatan Peninsula of Mexico ended up taking the brunt of the hurricane, and sustained the most damage, particularly around the Cancún and Playa del Carmen area where enormous waves took out power systems and destroyed parts of hotels and tourist sites. Tourists and locals alike were forced to evacuate or take refuge in emergency shelters to wait out the storm.

As Wilma moved through the Gulf of Mexico, there were emergency evacuations in western Cuba to get people out of low-lying and flood-prone regions. While Cuban’s had been warned of the oncoming storm, Wilma struck with more power than anticipated. The warm waters of the Gulf of Mexico helped strengthen the hurricane, which brought wind and waves strong enough to break through Havana’s sea barriers and send sea water up to a kilometer inland. The flooding left hundreds of people stranded and in need of rescue as well as destroying homes and roads in its wake.

Authorities were hopeful that a cold front might shear Hurricane Wilma before it made its way to the coast of Florida. Hurricanes are developed by vertical wind currents; as warm water evaporates from the ocean surface, it rises in circular air currents leading first to the creation of a tropical storm and then a hurricane if momentum continues to grow. As long as the hurricane is traveling over warm waters, generally above 26C (79F), it can continue to gain strength.

Hurricanes can be stopped by horizontal wind shear, which generally happens when the warm air of the storm comes in contact with a cold front. Conflicting air currents can rip apart a hurricane, causing it to dissipate or at the very least weaken, especially after losing some energy upon impacting a landmass. However, in the case of Hurricane Wilma, the storm was already too strong, and the wind shear did little to diminish the overall ferocity.

When Wilma hit the Florida coast early in the morning on Monday, October 25, winds were clocked at just over 200 km/h (about 125 mph). The ferocious wind brought with it up to 3 inches of rain in areas destroying houses, schools, and local landmarks.

Once Wilma reached Florida, it followed the projected trajectory of making landfall near Naples, then crossing the peninsula toward the West Palm Beach area and back out in to the Atlantic. This path cut right into the Everglades and caused the southern tip of Florida to be almost completely engulfed in the storm. Wilma’s immense size created an even larger wake, meaning that the entire area affected by the storm was much larger than the hurricane itself. From tornadoes along the coast to severe flooding in the Keys, the winds and rain of Wilma took a heavy toll in many areas.

While it only took Hurricane Wilma about 4.5 hours to cross the Florida peninsula, the aftermath of the storm carried out much longer. People had been warned to evacuate their homes, but many made the choice to stay in the area, sometimes resulting in them being stranded, flooded, or without power. Across the state of Florida about 3 million businesses and homes lost power as a result of the storm.

Various sources have reported slightly different death tolls, but it can be concluded that at least 23 people were killed from Hurricane Wilma. Haiti took the largest death toll due to horrific mud slides and lack of emergency response when the hurricane struck. In Florida, at least six people were killed by the storm, either drowned or crushed from the flooding and damage.

Several countries also took steep economic tolls from the storm, with Mexico reporting 20.6 billion USD in loss, Cuba 700 million USD, and 7.5 billion USD in the United States.

Hurricane Wilma serves as a reminder of the unpredictability of nature. Storm chasers and weather scientists can have all the best data, but still be unable to predict with certainty the exact course of events. No one anticipated Wilma to be as devastating as it ended up being. Thankfully, after crossing the Florida Peninsula and out into the Atlantic, the storm never made landfall again and simply dissipated once it moved over cold enough waters.

Wilma also demonstrated how natural disasters can affect entire ecosystems. One clear example is the Chimney Swift, a migratory bird whose path was interrupted by the storm, causing birds to be swept far off course and eventually resulting in a steep plummet in population. From human lives lost to interrupted pathways of nature, Wilma was as unpredictable as a Halloween phantom, setting records, defying norms, and leaving destruction and chaos in its wake.