JIRA server waterfall project, organize ranking

[Az]

Hello,

I have a waterfall project in JIRA and I am having a hard time setting the order that people should work on issues. I have the priorities set, but when there are 5 issues that are medium, 5 high, etc. it is not clear to them which one should be worked on first. 

What is the best way to communicate this information to my team - ideally in a way that is dynamic. We are globally distributed and work at different hours so having face-to-face won't work.  

[Chung Park Chan]

Besides the priority field, you could create a new single select custom field with the name, say "Urgency" to help prioritise the tasks.