Massachusetts Hurricane Evacuation Zones 2017 (Hosted Feature Layer)

The hurricane evacuation zones in this feature layer hosted by MassGIS are areas that may be inundated by storm surge or isolated by storm surge waters. As a hurricane approaches, local or state officials may order evacuations of these areas. Three zones are defined: Zone A & B – These zones include areas that, depending on predicted inundation, may flood first from storm surge during a tropical storm or hurricane. Areas in Zone A would flood before areas in Zone B. Zone C – The cities of Boston and Cambridge have designated a third zone, Zone C, which may flood depending on the track and intensity of the storm. Note: The hurricane evacuation zones do not directly correspond to hurricane categories. Storm surge impact is not measured by the Saffir-Simpson hurricane category scale, and storm surge threats can vary from storm to storm. Hurricane surge elevations were determined by the National Hurricane Center using the PV2 SLOSH model basin, and assumed peak hurricane surge arriving at mean high water. The Evacuation Zones are based on the Hurricane Surge Inundation that can be expected to result from a worst case combination of hurricane landfall location, forward speed and direction for each hurricane category. View metadata Tile service also available

本由马萨诸塞州地理信息系统（MassGIS）托管的要素图层所包含的飓风疏散区，指可能遭受风暴潮淹没或因风暴潮水域被孤立的区域。当飓风逼近时，地方或州级官员可下令对该类区域实施疏散。
本次共定义三类疏散区：A区与B区——此类区域依据预测淹没情况，可能在热带风暴或飓风来袭时率先因风暴潮发生积水，且A区的积水时间早于B区；C区——波士顿市与剑桥市划定了第三类疏散区C区，该区域是否会发生积水取决于风暴的移动路径与强度。
注意：飓风疏散区与飓风等级并无直接对应关系。风暴潮的影响程度并非通过萨菲尔-辛普森飓风等级量表（Saffir-Simpson hurricane category scale）衡量，且不同风暴的风暴潮威胁存在差异。风暴潮高度由美国国家飓风中心（National Hurricane Center）通过PV2 SLOSH模型流域确定，并假设峰值风暴潮抵达平均高潮位。本次疏散区的划定基于各飓风等级下，以飓风登陆位置、移动速度与方向的最坏组合情景所预期产生的风暴潮淹没情况。
元数据瓦片服务亦可使用。