A boil order has been issued for downtown Excelsior Springs, but city officials said the area could be expanded.  A power outage at the city’s water treatment plant has caused storage tanks to be drained.  Some areas of town (south and east of St. Louis Avenue, and the downtown area including the areas south and east of downtown) are without service. The city is asking residents to conserve water.  Lewis Elementary School will be dismissing at 11:53 a.m.