This work presents a high-dimensional, axiomatic model of atmospheric lightning based on the SEXA Unified Field Theory. Contrary to trajectory-based interpretations, lightning is modeled as a quantum vacuum plasma fracture governed by field-closure conditions rather than propagation through spacetime. The framework formalizes resistance polarity, Quantum Vacuum Conduit (QVC) structure, and recursive field coupling across a five-field manifold, providing a mathematical explanation for mid-air lightning termination and filamentary leader behavior. The analysis integrates observational lightning physics with a unified-field formalism in which spacetime emerges as a projected, resistive construct. Lightning leader termination is shown to occur when vacuum fracture support conditions fail, not when a spatial path is incomplete. The work further incorporates computational correspondence analysis using the Sigmatics (Sigil Algebra) framework to demonstrate cross-domain structural consistency without parameter fitting. This paper challenges geodesic intuition and thermodynamic locality assumptions by replacing trajectory-based models with closure-based physics operating across condensed and perpetual fields.