Radiator hose suddenly popped off at the manifold

Was on a short errand to the post office, less then ten miles of driving with an outside ambient temperature no more than seventy degrees. I came to a red light when suddenly my low coolant light comes on and a large amount of steam is coming from the engine compartment. I pulled right into a parking lot stop the engine, look under the hood and notice the radiator hose (which otherwise is in perfect condition) has come away at the manifold. My question is, what causes this to happen and are there any problems I need be aware of that can proceed this sort of incident?

Thank you in advance,
Sheila