Along with the exception to the at-will doctrine discussed above the WARN Act requires employers to provide written notice of least 60 calendar days in advance of covered plant closing and mass layoffs. However, the WARN notice only applies to business with 100 or more full-time workers (not counting workers who have less than 6 months on the job and workers who work fewer than 20 hours per week) is laying off at least 50 people at a single site of employment, or employes 100 or more workers who work at least a combined 4,000 hours per week.
