Definition 1 of 2
Definition
A panel-mounted airborne instrument that detects electrical discharges from thunderstorm activity and plots them as dots or symbols on a display, showing the pilot the direction and approximate distance of lightning relative to the aircraft. Unlike weather radar, which transmits a signal and reads the return, the Stormscope is passive — it only listens for the electrical energy produced by storms.
Plain English
A cockpit instrument that picks up the electrical activity from thunderstorms and shows it on a screen, so the pilot can see roughly where lightning is happening around the aircraft.
Context Anchor
Seen in cockpit weather equipment discussions and used during flight planning or en route decisions when thunderstorms may be nearby.
Derivation
A trade name combining 'storm' with 'scope' (from Greek 'skopein,' to look at or examine). The name reflects what it does: it lets the pilot 'look at' storms by displaying their electrical activity.
Why Pilots Care
Enables pilots to detect and avoid convective weather that radar may miss, reducing the risk of turbulence, icing, or structural damage.
Intuition Check
Do not treat a Stormscope like weather radar. It detects lightning activity; it does not directly show the shape or intensity of rain clouds.
Example Sentence 1
The pilot checked the Stormscope and saw a cluster of discharges 30 miles to the south, so he turned northwest to stay clear of the building cell.
Example Sentence 2
When the Stormscope began showing strikes twenty miles ahead, the crew requested a deviation from ATC.