A "crash alert" (more appropriately "sharp drop alert") is issued when the stock market is overbought per the mood generated forecast AND the forecast line in the chart is flat.
MMI is "undefined" for Wednesday and Thursday, and that means there is no daily MMI signal for those days, but it does give the chart the "flatline" needed to generate a two day "crash alert." The other requirement is that the market be overbought prior to this flatline. A good rally today (in progress) has also contributed to this alert. Further upside through the end of the day would be even better for this indication.
Note: this is not a prediction or certainty. It implies an elevated risk for a sharp drop in the market which may or may not be long lasting.