Often described as a gut feeling, a chill up your back or an overwhelming feeling of apprehension. Anomalous means that it cannot be explained through conventional knowledge.
Cognition is the process of knowing.
Whether intuition is extrasensory perception or tied to normal cognition, is a debate to this day. How it works, may never be known. But, there are many examples of intuition at work. Most people have intuition, some choose to ignore it. As I'm writing this, JFK Jr. and company have just been recovered from the sea.