Wiktionary
prestorm
a. Occurring or existing before a storm
Usage examples of "prestorm".
Who other than Runzi would be beating across the fields in a frigid, prestorm dawn, blocking our way to Zeor?
On the boom boxes that she passed, each and every one turned to maximum volume as an act of legal aggression, the Spanish singers were rolling their r's for minutes at a time as a result of prestorm static.