Mo. Rev. Stat. § 163.051
The state board of education, in the apportionment of the state school moneys fund, may use the average daily attendance of the next full year preceding or project the average daily attendance for the current year based on the average daily attendance for the last fifty days the schools of the district were in session before the schools were forced to close before the expiration of the term or before average daily attendance dropped substantially because of a disaster caused by flood, fire, windstorm or any natural disaster when all or part of the district is designated a disaster area by the governor of the state, or when districts have been forced to close because of nonpayment of taxes as a result of flooding or drought conditions or because of loss of surplus funds occasioned by bank failures in any county of the state.
§ 163.051, RSMo
Effective 6/27/1973