Acute stress with extreme volatility and liquidity breakdown. Correlations spike, violent drawdowns, and panic selling. Typically characterized by VIX above 35, sharp equity drops, and flight to cash/treasuries. The regime is determined by a Hidden Markov Model trained on 5 years of rolling data across equity returns (SPY, QQQ, IWM, DIA), volatility (VIX), dollar strength (DXY), yield curve spreads (2s10s), inflation expectations (5Y breakeven), and jobless claims. The confidence score of 96.2% represents the model's posterior probability of being in the current state.