VIX Spike This Week: How to Tell If Market Volatility Is Noise or a Real Signal
The short answer: a one-day jump in the VIX is usually noise. The index measures what options traders expect over the next 30 days, not what will actually happen — and a single-day spike often just prices a known event. Five checks separate the noise from a real signal: how long the spike lasts, how broad the selling is, what the volatility curve says, what else is moving with it, and whether the trigger is known or a mystery. Election week gave a clean example of the noise kind. Try the Compound Growth Calculator → The week that prompted this: October 30 to November 3 On Friday, October 30, the S&P 500 fell 1.82% to 7,580.07 — its worst session since June — while the Nasdaq 100 dropped 3.46% in a tech-led selloff. The VIX jumped about 13% to close at 19.42. On Monday, November 2, it climbed again to 21.15, up nearly 9% on the session. Then, on election day, November 3, it fell back to 20.51, down about 3% from the day before, according to Cboe data. Three details from that...