"The purpose of this guide is to provide assistance to school administrators and teachers in designing a severe weather emergency plan for their school. While not every possible situation is covered by the guide, it will provide enough information to serve as a strong starting point and a general outline of actions to take. The majority of material focuses on thunderstorms and the hazards they produce - lightning, hail, tornadoes, and flash floods. Thunderstorms can occur suddenly, with little or no warning. To insure safety, actions must occur quickly and be planned for in advance. This will become more apparent in Section 1: 'Understanding the Danger: Why an Emergency Plan is Needed.' Once you comprehend the scope of the problem, you can begin to address how to reduce the potential hazards. […] Safety is always the foremost concern. The ultimate goal is to 'quickly inform teachers and students anywhere on the school grounds to the threat of severe weather and to move them as quickly as possible to a predesignated shelters.' This section also discusses school bus actions in severe weather. For any plan to work efficiently, it must be practiced. It is recommended that schools conduct semi-annual drills and that severe weather safety instruction be part of this phase. It is important to understand why certain actions are being taken, to know the weather terms that are being used, and to know what visual clues can signal you to potential dangers ahead."
National Weather Service Eastern Region Headquarters: http://www.erh.noaa.gov/