precipice
chance
woe betide
distress signal
on a wing and a prayer
Pandora's box
eat shit
emergent
calamity
tactical warning
doomsay
bizen
paraenesis
natural disaster
wake-up call
strategic warning
unheralded
monition
it's an emergency
misfortune
hang by a thread
bad luck
notice
disastrous
Lord willing and the creek don't rise
adjuration
Lord willing
God willing
hard luck
ahoy
forewarn
previse
doomsaying
have one foot on a banana peel
fair warning
warning
red light
unfortunate
cast a shadow
blame
unfortunate person
warning light
desperate straits
in terrorem
dire straits