Quadruple Witching Day.

the Quarter Option Expiration Day, also is the day on which contracts for stock index futures, stock index options, stock options and single stock futures (SSF) all expire, happens 4 times a year, on March, Jun, Sep and Dec OE day.

huge volatility is expected.

chinese so called it "四重魔力日", sounds very powerful..haha~

anyways, market isnt panic enough, i hold my put options tight. my prediction is reversal might be come at the Quarter Option Expiration Week, spx should below 650, but put should unload bit by bit before that so we can prepare to switch to the long side.

good luck.