Each department must decide the answer to this question. Normally, classes that are broad based (needed for many majors), and those that are specifically needed to graduate would be considered high priority to continue following an emergency.
Special teaching issues are those non-traditional classroom instructional methods such as: clinicals, lab practicums, student teaching, community/field based activity, etc. Special situations that may warrant a bit more planning and coordination if those site locations were lost in the event and may not be as easily continued in an alternative mode.
LMS stands for learning management system. Blackboard serves as an LMS at OHIO.