"abnormal circumstances" is correct and usable in written English.
It can be used to describe an event or situation that is surprising or unexpected due to being out of the ordinary. For example, "The restaurant was closed unexpectedly due to abnormal circumstances."
Under abnormal circumstances, clots can also form in a vessel that has not been breached; such clots can result in the occlusion (blockage) of the vessel (see thrombosis).
It almost never rains, except under abnormal circumstances, but condensation of fog (called garúa by the Peruvians) provides a limited amount of moisture.
Offices that regularly deal with emergencies, such as the Federal Emergency Management Agency and the Office of United States Foreign Disaster Assistance, have the authority to bypass normal procedures in abnormal circumstances.
Through Ana, the author explores the long reach of grief: the initial shock and disbelief, the desperate attempts to turn back the clock, the absurdity of normal life in abnormal circumstances.
A chancellor would be allowed to override the budget surplus rule if the economy again ran into severe problems, but the details of what would constitute abnormal circumstances will not be revealed until Osborne delivers his summer budget on 8 July.
The doctrine of chances reasons that evidence of prior bad acts might be relevant enough to introduce at trial on a theory that goes something like, What are the chances that an innocent person would be repeatedly involved in such similar, abnormal circumstances?
So relative to (16) and (17), Ga is not a special or abnormal circumstance.
This in turn derives in metabolic processes running under abnormal parametric circumstances.
As the character of the abnormal living circumstances differs between the West Bank and the Gaza Strip, no simple interpretation can be applied to differences between the two territories.
In certain circumstances, these unusual hemodynamic conditions generate an abnormal biological response.
Intuitive cognitions, on the other hand, can sometimes induce false beliefs, too, if the circumstances are abnormal (in cases of perceptual illusions in particular), but even then, they would still cause some true contingent judgements.
