Definition
A range of radio frequencies, roughly 4 to 8 gigahertz (GHz), used by certain weather and air traffic radars. C band radar offers a balance between long-range detection and the ability to see precipitation detail, making it common in airborne weather radars and some ground-based weather systems.
Plain English
A specific slice of the radio spectrum that radars use to detect rain, storms, and aircraft. C band sits in the middle of the useful radar range — long enough reach to see weather far ahead, short enough wavelength to pick out detail in clouds and precipitation.
Context Anchor
Seen in aviation weather discussions about radar observations, especially when comparing different weather radar systems and their limits.
Derivation
The letter designations (L, S, C, X, Ku, K, Ka) come from World War II–era military code names for radar frequency ranges, originally chosen to keep the actual frequencies secret. The letters stuck and are still used today. The 'C' has no descriptive meaning — it's just a label for that band of frequencies.
Why Pilots Care
C-band radars give reliable precipitation returns with good range, helping pilots avoid hazardous weather.
Grounding Statement
A C-band radar sends out microwave energy in the C-band range, then builds a weather picture from the energy that comes back.
Intuition Check
C band is not a physical band and not one exact frequency. It is a named range of radar frequencies.
Example Sentence 1
Many airborne weather radars operate in the C band because it provides good detection of precipitation at useful ranges.
Example Sentence 2
Some terminal radar systems operate in the C band for precise aircraft tracking.