Definition
A standardized scale used by air traffic controllers and pilots to describe the strength of precipitation as detected by ground-based or airborne weather radar. The scale runs from Level 1 (light) through Level 6 (extreme), with each level corresponding to a defined range of radar reflectivity that indicates how heavy the rain, snow, or mixed precipitation is in a given area.
Plain English
A 1-to-6 rating that tells you how heavy the rain or other precipitation is inside a storm, based on what the radar sees. Level 1 is light. Level 6 is the worst.
Context Anchor
Seen in weather radar displays, pilot weather briefings, and controller weather advisories when areas of precipitation are being described.
Derivation
“Radar” comes from “radio detection and ranging,” meaning a system that uses radio waves to find objects and distance. “Precipitation” comes from a Latin idea of something falling down; in weather, it means water or ice falling from clouds. Together, the phrase points to radar measuring the strength of falling weather.
Why Pilots Care
Helps pilots identify and avoid severe weather that could cause turbulence, structural icing, or loss of control.
Grounding Statement
If a radar display shows a line of heavy or extreme precipitation ahead, picture a dense area of falling water or ice that the airplane may need to go around, not just a patch of ordinary clouds.
Intuition Check
Do not read “intensity” as simply “how bad the weather feels.” Here it means how strong the precipitation return is on radar; radar precipitation intensity is not a direct turbulence report, even though stronger precipitation often goes with more hazardous weather.
Example Sentence 1
Center advised the pilot of a Level 4 cell twenty miles ahead, and she requested a deviation twenty degrees right of course.
Example Sentence 2
Pilots check precipitation intensity on the display to keep safe distance from areas of strong convective activity.