Which of the following elements must be disseminated regardless of any delay?

Volcanic eruptions are crucial pieces of information that must be disseminated immediately, regardless of any delays. This is primarily because volcanic eruptions can pose significant hazards not only to air travel but also to the surrounding populations. The ash cloud generated can affect airplanes, leading to flight cancellations and rerouting, which can have widespread implications. Additionally, the occurrence of an eruption may necessitate immediate evacuations and other emergency responses to ensure public safety.

The urgency in the dissemination of information regarding volcanic eruptions stems from the unpredictable nature of the event and its potential to impact large areas quickly. Timely warnings can save lives and minimize risks to those in the vicinity, making it essential that this information be communicated promptly and efficiently.

Other weather-related events like tornadoes, thunderstorms, and blizzards are also significant and warrant quick communication; however, they may allow for some preparatory time or be part of broader warnings without the same immediate necessity for action that eruptions demand.