All previous weekly bars are plotted on a Friday close only, but the latest bar will be plotted regardless of the day of the week. Assuming the other entry setup conditions are met, that might be sufficient to trigger an entry signal. If the PopSteckle code had used weekly bars to evaluate the weekly slow stochastic, historical ShowMe or trade system calculations would not show any signals for Monday through Thursday. ShowMe alerts or trades would only show on Friday if all the entry conditions were met. Entry setup condition 4 requires the weekly stochastic value to be greater than 50 and rising.
Chartists use longer time intervals to reduce the noise inherent in shorter time intervals.
Weekly charts will not reveal daily price fluctuations intraweek. I encourage the reader to experiment with other time intervals. While not identical, values between the two were very close. ShowMe Condition4 requires that volume be much higher than the average daily volume. Heavy volume frequently accompanies a stock breaking out of a congestion range that continues higher in price over the following days or weeks.