A hurricane that develops inside the Gulf of Mexico sufficiently close to the relevant platform such that personnel evacuation is not assured.
Source: API RP 2SIM, Structural Integrity Management of Fixed Offshore Structures, First Edition, November 2014. Global Standards
Sudden tropical revolving storm that forms near the site and that can affect the jack-up before demanning can be completed within the time required by the emergency evacuation plan. NOTE The intent is that the jack-up be assessed to L1 for the specified sudden tropical revolving storm.
Source: ISO 19905-1:202, Petroleum and natural gas industries – Site-specific assessment of mobile offshore units – Part 1: Jack-ups. Global Standards