Others have chimed in already, but the reason why I defer to BOX for forecasts and warnings:
They do this for a living, are trained, and focus their entire workday on generating forecasts.
They have access to forecasting tools and data that most of us do not.
They have experience with our climatology and know how to apply that to model generated forecasts that may get overlooked.
They aren't generating forecasts with the requirement to generate ratings, page views, clicks, or advertising revenue.
Just my opinion... They provide a valuable service to us, even those of us who have the interest in making our own forecasts. I don't mind the more conservative approach to their forecasting compared to what you get everywhere else these days. Some irony there...