As a Chinese I would prefer to believe our government is behind this. Do you know Beijing (or even the whole country) has a serious smog issue which was first uncovered by American embassy in Beijing? The incident makes the government lose their trust in public, and for quite some time people only want to trust forecast from NOAA in stead of Beijing. If Chinese government hacked NOAA, it would be out of their intention to contain domestic reactions. Actually, our government has greater problems at home than abroad.