Rainbands exist in the periphery of tropical cyclones, which point towards the cyclone's center of low pressure.[11] Rainbands within tropical cyclones require ample moisture and a low level pool of cooler air.[12] Bands located 80 kilometres (50 mi) to 150 kilometres (93 mi) from a cyclone's center migrate outward.[13] They are capable of producing heavy rains and squalls of wind, as well as tornadoes,[14] particularly in the storm's right-front quadrant.[15] Some rainbands move closer to the center, forming a secondary, or outer, eyewall within intense hurricanes.[16] Spiral rainbands are such a basic structure to a tropical cyclone that in most tropical cyclone basins, use of the satellite-based Dvorak technique is the primary method used to determine a tropical cyclone's maximum sustained winds.[17] Within this method, the extent of spiral banding and difference in temperature between the eye and eyewall is used to assign a maximum sustained wind and a central pressure.[18] Central pressure values for their centers of low pressure derived from this technique are approximate.

雨带存在于TC的外围，指向环流低压中心。TC内的雨带需要充足的水汽和相对较冷的低层空气。距离TC中心80~150km的雨带会向外移动。它们能产生强降水、飑线和龙卷，特别在风暴的右前方象限内。有些雨带距离环流中心更近，在一些较强的飓风中形成了二级（或外层）眼墙。由于螺旋雨带是TC的基本结构，因此对于大多数TC环流，基于卫星资料的德沃夏克分析法是决定TC最大持续风的主要方法。在该方法中，螺旋雨带的大小和眼区眼壁的温差被用于推测最大持续风和中心气压。该方法推测得到的结果为近似值。