According to experts, color coding, which is used worldwide in weather warnings, gets more attention. It is also easier to understand, compared to warnings describing potential dangers or issues.
The system of color-coded warnings used in Europe was developed by British meteorologists and is called MediaAlarm. Colors are assigned based on a set of data. Thus, hail itself may not be particularly dangerous, but hail combined with thunderstorms and squally winds can be a real threat.
There are four levels of danger.
Green. Dangerous and adverse weather conditions are not expected.
Yellow. There is a chance of precipitation, thunderstorms, gusty winds, etc. Weather events are normal, but can sometimes be dangerous for certain types of social and economic activities.
Orange. Squalls, showers, thunderstorms, heat, frost, hail, etc. are expected. Weather events can not only affect social and economic activities, but also result in material damage and casualties.
Red. Hurricanes, torrential rains, heavy snow, extreme fire hazard, etc. are expected. Weather conditions can result in serious material damage and major casualties.