Oklahoma’s First-response Information Resource System using Telecommunications (OK-First) has been used for many years to provide education, training, connections, and follow-up support for public safety officials with emergency management responsibilities in Oklahoma. Public safety officials use OK-First training and Mesonet tools to plan and make decisions to save lives and property. However, like most public systems, little is known about user interactions with tools, decisions made, and estimated savings using a weather decision support system. This study used a mixed approach of instruments and methods to collect and analyze data from three key sources to assess the perceptions, beneficiaries, and applications of weather support systems for public safety officials. Results showed that a diverse set of tools were needed and used by public safety officials to make decisions in hazardous weather conditions. OK-First tools resulted in estimated self-reported cost savings of over $1.2 M for 12 months. This study provides a crucial step in determining user interactions with tools, training, and services to better understand weather decision support systems used during hazardous weather.