After four snow storms...
Under the 'two-thirds' rule...the best 'two out of three' z-scores are used to compute the interim standings. After Snow Storm #4...your top three z-scores were used to calculate these standings. Data used to compute the standings are posted at the Contest web site here.
Z-scores are used to standardize / normalize forecast errors for each snow storm so at the end of the season...the 'equalized' scores can be averaged.
An expanded data table with additional measures of forecaster skill at the Contest's home page.