Urgency in applications arises when, at the time the need to act arrives, the matter cannot wait. Urgency which stems from deliberate or careless abstention from action until the deadline draws near is not the type of urgency contemplated by the rules. Where an applicant is aware of circumstances giving rise to potential prejudice but delays in bringing an application until the inevitable consequences occur, the application will not be treated as urgent. The duty to act arises when the applicant becomes aware of the circumstances affecting their rights, not when those circumstances produce their natural consequences. Certificates of urgency and supporting affidavits must always contain an explanation for any delay in bringing the application.