Related Clues:

• Potentially disastrous
• --- Straits (rock group)
• Calamitous, like a threat
• Acute
• Extremely serious
• Dreaded
• Fraught with danger
• Apocalyptic
• Like some warnings
• Tragic
• Disastrous
• Like some circumstances
• Dreadful, as circumstances
• Requiring immediate attention
• Life-or-death