NCEP NOTES Objective Guidance for Use in Setting Tropical Cyclone Conditions of Readiness

TheDepartment ofDefense uses a Tropical CycloneConditions ofReadiness (TC-CORs) system to prepare bases and evacuate assets and personnel in advance of adverse weather associatedwith tropical cyclones (TCs). TC-CORs are recommended by weather facilities either on base or at central sites and generally are related to the timing and potential for destructive (50 kt; 1 kt ’ 0.5144 m s21) sustained winds. Recommendations are then considered by base or area commanders along with other factors for setting the TC-CORs. Ideally, the TC-CORs are set sequentially, from TC-COR IV (destructive winds within 72 h), through TC-COR III (de-structive winds within 48 h) and TC-COR II (destructive winds within 24 h), and finally to TC-COR I (de-structive winds within 12 h), if needed. Each TC-COR, once set, initiates a series of preparations and actions. Preparations for TC-COR IV can be as unobtrusive as obtaining emergency supplies, while preparations and actions leading up to TC-COR I are generally far more costly, intrusive, and labor-intensive activities. The purpose of this paper is to describe an objective aid that provides TC-COR guidance for meteorologists to use when making recommendations to base commanders. The TC-COR guidance is based on wind probability thresholds from an operational wind probability product run at the U.S. tropical cyclone forecast centers. An analysis on 113 independent cases from various bases shows the skill of the objective aid and how well i