The new observation capabilities would result in simply a mass of details were it not for the fact that theoretical understanding has reached the stage at which it is becoming possible to indicate the kind of measurements required for reliable weather forecasting.
were it not 是一个虚拟语气吗???怎么会有这种形式的虚拟语气

用软件翻译的：新的观察能力会造成只是大量的细节如果不是事实：理论上的理解有到达了阶段在哪一个它是合式的可能指出对预测的可靠的天气是必需的测量的类型。
如果它是不