&sq=&lang=&file=File:Hilary_2011-09-23_2000Z.jpg) Hilary at peak intensity on September 23 | |
| Meteorological history | |
|---|---|
| Formed | September 21, 2011 |
| Remnant low | September 30, 2011 |
| Dissipated | October 3, 2011 |
| Category 4 major hurricane | |
| 1-minute sustained (SSHWS/NWS) | |
| Highest winds | 145 mph (230 km/h) |
| Lowest pressure | 942 mbar (hPa); 27.82 inHg |
| Overall effects | |
| Fatalities | None |
| Damage | Minimal |
| Areas affected | Southwestern Mexico |
| IBTrACS / [1] | |
Part of the 2011 Pacific hurricane season | |
Hurricane Hilary was a powerful tropical cyclone that caused significant flooding in southwestern Mexico in late September 2011. The fourth Category 4 and major hurricane, seventh hurricane, and eighth tropical storm of the 2011 Pacific hurricane season, Hilary developed from an area of low pressure off the Pacific coast of Central America in mid-September. Organizing quickly, the system became a tropical depression on September 21, after gaining enough organization to be declared as such. While moving towards the west-northwest, the depression continued to gather strength and was subsequently upgraded to a tropical storm just several hours later. On September 21, Hilary was declared as a Category 1 hurricane, while located close to the Mexican coastline, where the storm brought heavy rainfall and flooding. Undergoing rapid intensification, Hilary strengthened into a Category 4 hurricane on September 22, recognized with a distinct eye feature. Beginning to enter cooler Ocean temperatures, Hilary began to weaken by September 25 but briefly restrengthened into a Category 4 the following day. Atmospheric conditions became increasingly unfavorable late on September 26, and the system began to weaken. During the afternoon hours of September 30, Hilary became a remnant low, while located several hundred miles away from any landmasses.