Well an alarm would be a better synonym for warning, but in general terms, they can be considered synonyms since alert is mostly used as a veryb. For exapmple: Did you alert the President about the upcoming war?
While a warning is a noun, like: She gave him a warning, so that if he did not pay his taxes, he would be sued.
alert
alert
A tornado warning is a higher level of alert, often meaning that a tornado has formed.
ball sack licking
attentive
What does the wavering tone warning signal alert a base for
alert, certain, aware, informed
Alert is an apt synonym for notify.
Alert?
Caution or warning
doubt
air attack