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| Hurricane Iselle | |
|---|---|
| Name | Iselle |
| Type | Hurricane |
| Year | 2014 |
| Basin | EPac |
| Formed | July 31, 2014 |
| Dissipated | August 11, 2014 |
| Extratropical | August 11, 2014 |
| 1-min winds | 90 |
| Pressure | 968 |
| Areas | Central Pacific Ocean, Hawaiian Islands, Big Island of Hawaii, Maui, Oahu |
Hurricane Iselle Hurricane Iselle was a powerful Pacific hurricane in 2014 that made landfall on the Big Island of Hawaii as a tropical storm, producing extensive agricultural damage and prompting emergency responses across the State of Hawaii, United States federal agencies, and local municipalities. The storm developed in the Eastern Pacific Ocean and tracked northwestward through the Central Pacific Hurricane Center's area of responsibility before interacting with island topography, influencing rainfall, wind, and tropical cyclone structure over the Hawaiian Islands.
Iselle originated from a tropical wave east of the Lesser Antilles's typical genesis region that crossed the Panama Canal region into the Eastern Pacific Ocean; rapid organization occurred near the Intertropical Convergence Zone under low vertical wind shear and warm sea surface temperatures monitored by the National Hurricane Center, the Central Pacific Hurricane Center, and the National Oceanic and Atmospheric Administration. Intensification to hurricane status followed symmetric convection and establishment of an eyewall, observed by GOES satellite imagery, TRMM rainfall estimates, and reconnaissance by NOAA Hurricane Hunters and Air Force Reserve flights; peak intensity reached Category 2 on the Saffir–Simpson scale with central pressure near 968 mbar recorded by dropsonde deployments. As the cyclone approached the Hawaiian Islands, interaction with a mid-level trough and increasing shear, combined with entrainment of dry air from the North Pacific High and frictional effects of Mauna Kea and Mauna Loa topography, led to weakening and asymmetric windfields prior to landfall on the windward coast of the Big Island of Hawaii.
In advance of Iselle, the State of Hawaii governor issued emergency proclamations and coordinated with the Federal Emergency Management Agency and the United States Coast Guard to pre-position resources, while the National Weather Service and the Central Pacific Hurricane Center issued tropical storm warnings and hurricane watches for the Hawaiian Islands; county emergency management offices in Hawaii County, Maui County, and Honolulu County activated shelters and mobilized National Guard units. Utilities such as Hawaiian Electric Industries and Hawaiian Telcom preemptively staged crews, airports including Hilo International Airport and Kahului Airport adjusted operations, and schools across the Big Island of Hawaii and Maui closed in coordination with local school districts and the Department of Education (Hawaii). Evacuations occurred in vulnerable coastal and low-lying zones, with coordination among American Red Cross, Salvation Army, and municipal police and fire departments to manage supply distribution and emergency medical services.
Iselle produced destructive winds, flash flooding, and landslides across the Big Island of Hawaii, causing extensive damage to the Kona coffee crop, sugarcane fields, and macadamia nut orchards; damage assessments involved the United States Department of Agriculture and the Hawaii Department of Agriculture. Infrastructure impacts included widespread power outages affecting customers served by Hawaiian Electric Company, road closures on Hawaii State Route 11 and access disruptions to Hawaii Volcanoes National Park, while housing and small businesses in communities such as Pāhoa experienced roof and structural damage leading to disaster assistance from the Small Business Administration and state recovery programs. Search and rescue units from the Hawaii County Fire Department and mutual aid from Maui Fire Department responded to emergencies, and prolonged restoration efforts engaged contractors, the U.S. Army Corps of Engineers, and volunteer organizations including AmeriCorps and the Hawaii Volunteer Organizations Active in Disaster.
At peak intensity Iselle attained Category 2 strength on the Saffir–Simpson scale with maximum sustained winds near 100 mph and a minimum central pressure around 968 mbar, verified via dropsonde and aircraft reconnaissance coordinated by NOAA and the Air Force Reserve; satellite-based intensity estimates employed the Dvorak technique used by the Central Pacific Hurricane Center and the National Hurricane Center. Iselle was notable for being one of the strongest tropical cyclones to approach the Hawaiian Islands during the satellite era documented by University of Hawaii researchers and the Pacific Disaster Center, and its asymmetric wind field and rapid weakening before landfall illustrated the role of island orography including Mauna Kea and Mauna Loa in modifying cyclone intensity and structure.
Following the 2014 season, the name Iselle remained on the Eastern Pacific naming list managed by the World Meteorological Organization for the basin and was not retired immediately by the WMO's regional committee, although subsequent post-storm assessments by the National Hurricane Center and the Central Pacific Hurricane Center informed regional naming practices and future risk communications. The WMO Regional Association IV and member delegations, including representatives from the United States and Hawaii interests, evaluate significant storms for retirement of names when socio-economic impacts meet retirement criteria.
Iselle's environmental impacts included defoliation and salt spray damage to native and introduced vegetation on the Big Island of Hawaii, altered stream sediment loads affecting the Pacific Ocean nearshore coral reef systems monitored by the Hawaii Institute of Marine Biology and the NOAA Coral Reef Conservation Program, and increased erosion on slopes within Hawaii Volcanoes National Park, prompting assessments by the National Park Service. Economically, crop losses particularly to Kona coffee plantations and macadamia nut operations led to emergency relief coordinated with the USDA Farm Service Agency and influenced commodity markets tracked by agricultural economists at the University of Hawaii at Manoa and the Economic Research Service, while insurance claims processed through carriers regulated by the Hawaii Insurance Division and federal disaster assistance shaped recovery timelines.
Category:2014 Pacific hurricane season Category:Pacific hurricanes in Hawaii