Writs are typically sought when a trial court has made a significant legal error and waiting for a final judgment to appeal would cause immediate, irreparable harm. Common situations where a writ may be appropriate include discovery disputes where privileged information is at risk of being disclosed, rulings that would fundamentally alter the character of the case before trial, denial of a motion to compel arbitration, and disqualification of counsel.
Timing is critical. Writ petitions must generally be filed within days or weeks of the challenged ruling. Missing the deadline can permanently foreclose the right to seek early appellate review.