Definition
Long, narrow regions of concentrated rainfall that spiral outward from the center of a tropical cyclone or hurricane, separated by areas of lighter rain or no rain. Rain bands contain heavy precipitation, gusty winds, and often embedded thunderstorms.
Plain English
Curved strips of heavy rain that wrap around a hurricane or tropical storm, with calmer gaps between them.
Context Anchor
Seen in weather forecasts, weather radar, and preflight or in-flight weather decisions when rain is organized in lines rather than spread evenly over a wide area.
Derivation
“Band” means a strip or belt. In weather, a rain band is rain arranged like a strip across an area, which helps explain why conditions can change quickly as an aircraft enters or leaves one.
Why Pilots Care
Pilots must avoid or plan around rain bands because they often contain turbulence, wind shear, reduced visibility, and possible icing.
Grounding Statement
Picture flying from a dry area into a long strip of rain, then back into lighter conditions after crossing the strip.
Intuition Check
Do not assume rain bands mean one solid area of rain everywhere. A rain band is an organized strip, and conditions can be much better between the bands than inside them.
Example Sentence 1
The outer rain bands of the approaching hurricane were already producing heavy showers along the coast hours before landfall.
Example Sentence 2
Heavy rain bands along the front forced a delay in departure until the line passed.