I have some inside knowledge. This mess up goes back a long way. About 10 years back the bureau realised they had a major security problem. Bad actors could get into the bureau's systems and mess things up pretty badly. Security is important because people's lives depend on weather being predicted accurately. Think aircraft, ships, flooding, fire, the whole bit.
To their credit they decided to do something about it, and getting money to fix it wasn't an issue, the government was on side. To their discredit, what they decided to do was hire some consultants to tell them how to fix it instead of asking their own people, giving their own people training in how to do security or integrating people with security expertise into their existing teams. The consultants said start again. All their systems, not just the public facing web site which is a small proportion of their IT.
They ridiculously and obscenely underestimated how long it would take to start again. They hired a whole department of new people under new managers who knew nothing about weather and made no workable attempt to integrate this department into their existing power structures. Their existing people were sidelined, respected middle managers were pushed aside, the shop floor was told not to complain upwards because it would only make extra work for the middle managers and nothing would be achieved. So of course their best people got pissed off and some of them left. Of course the public would not be aware of any of this nonsense until this ridiculous new web site was made available, created by people who had little of the bureau's existing expertise.