Definition
Fine, electrically conductive particles suspended in the atmosphere — typically released by military operations as chaff (thin strips of metal foil or metalized fiber used to confuse radar) — that reflect radar energy and produce false returns on weather radar displays such as NEXRAD.
Plain English
Tiny bits of metal floating in the air, usually dropped by the military, that bounce radar signals back and make it look like there is weather on the radar screen when there isn't.
Context Anchor
Seen in NEXRAD abnormality discussions, where the displayed radar return may be caused by something other than precipitation.
Why Pilots Care
Misidentifying metallic dust as weather can lead to unnecessary route changes or delayed departures.
Grounding Statement
Metallic dust matters because radar shows reflected energy, and small metal particles can reflect that energy much like precipitation can.
Intuition Check
Do not assume metallic dust means metal shavings from an engine or dust on the airplane. In this context, it means tiny metal material in the air that can create a radar return that looks like weather.
Example Sentence 1
The cluster of returns near the military operations area turned out to be metallic dust from a training exercise, not actual precipitation.
Example Sentence 2
Clear skies over the airport but persistent radar echoes prompted the pilot to ask whether metallic dust might be the source.