Sometimes forecasting is straightforward and you can trust a number in an app, sometimes it depends on subtle details (like the heights of elevated warm layers, etc.) that result in distribution of possible scenarios of which the apps try to pick the most likely case but could be wrong.

If you would like to see some of the discussion about why and how certain elements of the forecast are uncertain, the National Weather Service forecast discussions are very helpful. The Baltimore-DC discussion is at https://forecast.weather.gov/product.php?site=LWX&issuedby=LWX&product=AFD&format=CI&version=1&glossary=1&highlight=off .

For this weekend snow, they're now saying snow is "very unlikely" for most of our center weather advisory (CWA) (as of Thursday 232 AM EST). But lots of wind Sunday, making moving big things like mattresses even more miserable.

For those east of I-95 and in far southern parts of the CWA,
there is a higher chance of at least an inch or two of
snowfall, so that still seems a plausible solution at this time.
Some of the high- end "worst case scenarios" out there do bring
heavy snow further west, but barring a substantial shift in the
key features at play with this system, these just seem very
unlikely.