Per the author:
Also in jeopardy: Engineering + IT support for N-Wave, NOAA’s internet + network provider. N-Wave transmits weather forecasting data. Internal email warns of "significant service disruptions” if contracts aren’t extended.
Edit:
Since this was published, there has apparently been a bit of a reprieve as word got out about how bad this would be
It’s not clear exactly what will break or when; things are too chaotic to really be sure until it does