The Occupational Safety and Health Administration (OSHA) has created an Employer Checklist for Outdoor and Indoor Heat-Related Injury and Illness Prevention which may be utilized to identify sources of heat hazards in the workplace and respond effectively. Section 1 of the checklist is designed to help employers recognize job-related heat risks while Section 2 explores preparedness for heat-related injuries and illnesses. Additional OSHA resources on heat-illness prevention are included on the last page of the checklist.

The University of Houston Clear Lake, using grant funds from the Occupational Safety and Health Administration (OSHA), created a model 

The National Weather Service has graphical forecasts for many weather variables including heat index and wet bulb globe temperature which can be used to evaluate risk of heat stress. These predictive tools may be utilized to evaluate the risk of heat stress up to one week in advance and may aid in planning of field activities.
Article By: The Rutgers Farm Health and Safety Working Group: Kate Brown, Michelle Infante-Casella, Stephen Komar and William Bamka