The phrase "a sobering warning" is correct and usable in written English.
It can be used when referring to a serious or serious message that serves to alert or caution someone about a potential danger or issue.
Example: "The report provided a sobering warning about the effects of climate change on our planet."
Alternatives: "a serious alert" or "a stark caution".
"Chaos follows until a new system of order is established". It's a sobering warning.
Early in his career as a conductor, James Conlon was given a sobering warning.
But the fact that the world came perilously close to nuclear conflict because of actions taken by individuals outside of the world's capitals and based on erroneous assumptions should be a sobering warning for those who minimize the current dangers.
A British cabinet minister warned the other day that they were the "subprime assets of the future", a sobering warning for everyone still recovering from the housing bust of 2008.
Hours after the draft security council ceasefire resolution was published, the US secretary of state, Condoleezza Rice, also issued a sobering warning that she expected fighting to continue once the text was formally adopted today or tomorrow.
Propelling yourself into an unknown element – be it into the air from a zip-line or into water to swim with wildlife – always causes a strange feeling in the stomach, like a sobering warning.
Hurrying inside toward the throbbing techno music on a recent Friday night, Chen Ping, a 26-year-old graphic designer, chuckled at the sobering warning.
They are another sobering warning that insider trading may be pervasive, from relatively low rungs to the top.
Another sobering warning is that after British house prices fell in the early 1990s, it took at least a decade before they returned to their previous peak, after adjusting for inflation.Another worrying lesson from abroad for America is that even a mere levelling-off of house prices can trigger a sharp slowdown in consumer spending.
(The No. 2 at Goldman, Gary D. Cohn, had a more sobering message, warning in an interview on Bloomberg TV of a possible "substantial repricing" in debt markets).
As a sobering assessment of missed warnings, leaders that could not see the wood for the trees and a failure of governance at a bank that very nearly went bust, Sir Christopher Kelly's report on the debacle at the Co-op Bank will take some beating.
