Quote from mikeenday:
if it closes almost low of the day, you have high probability to have a gap down Monday.
so no need to close your short positions. and a good day to open some shorts 5 minutes before market closes today.
i am looking for a "relief rally" on Monday assuming no 9/11 terrorism over weekend.
Further with weekly options on many equities it creates greater vola with option pinning/unwinding (on Fridays.) This week the market trended higher and thus it "made sense" that unwinding could or might take prices lower coupled with concern over 9/11 and September being a week 'typically' weaker month.