N.J. Stat. Ann. § 40A:4-46

A local unit may make emergency appropriations, after the adoption of a budget, for a purpose which is not foreseen at the time of the adoption thereof, or for which adequate provision was not made therein. Such an appropriation shall be made to meet a pressing need for public expenditure to protect or promote the public health, safety, morals or welfare or to provide temporary housing or public assistance prior to the next succeeding fiscal year.